Add spectrum visualizer

2025-12-07 03:57:07 +03:00 · 2020-02-16 22:56:08 -08:00
parent 11f2b0a563
commit ed224f6b71
19 changed files with 737 additions and 272 deletions
--- a/components/display/display.c
+++ b/components/display/display.c
@@ -117,7 +117,7 @@ static void displayer_task(void *args) {
 			if (displayer.state == DISPLAYER_IDLE) display->line(2, 0, DISPLAY_CLEAR | DISPLAY_UPDATE, displayer.string);
 			vTaskSuspend(NULL);
 			scroll_sleep = 0;
-			display->clear();
+			display->clear(true);
 			display->line(1, DISPLAY_LEFT, DISPLAY_UPDATE, displayer.header);
 		} else if (displayer.refresh) {
 			// little trick when switching master while in IDLE and missing it
--- a/components/display/display.h
+++ b/components/display/display.h
@@ -51,8 +51,9 @@ enum displayer_time_e 	{ DISPLAYER_ELAPSED, DISPLAYER_REMAINING };
 // don't change anything there w/o changing all drivers init code
 extern struct display_s {
 	int width, height;
+	bool dirty;
 	bool (*init)(char *config, char *welcome);
-	void (*clear)(void);
+	void (*clear)(bool full, ...);
 	bool (*set_font)(int num, enum display_font_e font, int space);
 	void (*on)(bool state);
 	void (*brightness)(uint8_t level);
@@ -60,8 +61,10 @@ extern struct display_s {
 	bool (*line)(int num, int x, int attribute, char *text);
 	int (*stretch)(int num, char *string, int max);
 	void (*update)(void);
-	void (*draw)(int x1, int y1, int x2, int y2, bool by_column, uint8_t *data);
-	void (*draw_cbr)(uint8_t *data, int height);		// height is the # of columns in data, as oppoosed to display height (0 = display height) 
+	void (*draw_raw)(int x1, int y1, int x2, int y2, bool by_column, bool MSb, uint8_t *data);
+	void (*draw_cbr)(uint8_t *data, int width, int height);		// width and height is the # of rows/columns in data, as opposed to display height (0 = display width, 0 = display height) 
+	void (*draw_line)(int x1, int y1, int x2, int y2);
+	void (*draw_box)( int x1, int y1, int x2, int y2, bool fill);
 } *display;

 void displayer_scroll(char *string, int speed);
--- a/components/display/driver_SSD13x6.c
+++ b/components/display/driver_SSD13x6.c
@@ -38,25 +38,26 @@ static const char *TAG = "display";

 // handlers
 static bool init(char *config, char *welcome);
-static void clear(void);
+static void clear(bool full, ...);
 static bool set_font(int num, enum display_font_e font, int space);
 static void text(enum display_font_e font, enum display_pos_e pos, int attribute, char *text, ...);
 static bool line(int num, int x, int attribute, char *text);
 static int stretch(int num, char *string, int max);
-static void draw_cbr(u8_t *data, int height);
-static void draw(int x1, int y1, int x2, int y2, bool by_column, u8_t *data);
+static void draw_cbr(u8_t *data, int width, int height);
+static void draw_raw(int x1, int y1, int x2, int y2, bool by_column, bool MSb, u8_t *data);
+static void draw_line(int x1, int y1, int x2, int y2);
+static void draw_box( int x1, int y1, int x2, int y2, bool fill);
 static void brightness(u8_t level);
 static void on(bool state);
 static void update(void);

 // display structure for others to use
-struct display_s SSD13x6_display = { 0, 0, 
+struct display_s SSD13x6_display = { 0, 0, true,
 									init, clear, set_font, on, brightness, 
-									text, line, stretch, update, draw, draw_cbr, NULL };
+									text, line, stretch, update, draw_raw, draw_cbr, draw_line, draw_box };

 // SSD13x6 specific function
 static struct SSD13x6_Device Display;
-static SSD13x6_AddressMode AddressMode = AddressMode_Invalid;

 static const unsigned char BitReverseTable256[] = 
 {
@@ -150,9 +151,24 @@ static bool init(char *config, char *welcome) {
 /****************************************************************************************
 * 
 */
-static void clear(void) {
-	SSD13x6_Clear( &Display, SSD_COLOR_BLACK );
-	SSD13x6_Update( &Display );
+static void clear(bool full, ...) {
+	bool commit = true;
+	
+	if (full) {
+		SSD13x6_Clear( &Display, SSD_COLOR_BLACK ); 
+	} else {
+		va_list args;
+		va_start(args, full);
+		commit = va_arg(args, int);
+		int x1 = va_arg(args, int), y1 = va_arg(args, int), x2 = va_arg(args, int), y2 = va_arg(args, int);
+		if (x2 < 0) x2 = display->width - 1;
+		if (y2 < 0) y2 = display->height - 1;
+		SSD13x6_ClearWindow( &Display, x1, y1, x2, y2, SSD_COLOR_BLACK );
+		va_end(args);
+	}
+	
+	if (commit)	update();		
+	else SSD13x6_display.dirty = true;
 }	

 /****************************************************************************************
@@ -209,12 +225,6 @@ static bool line(int num, int x, int attribute, char *text) {
 	// counting 1..n
 	num--;
 	
-	// always horizontal mode for text display
-	if (AddressMode != AddressMode_Horizontal) {
-		AddressMode = AddressMode_Horizontal;
-		SSD13x6_SetDisplayAddressMode( &Display, AddressMode );
-	}	
-	
 	SSD13x6_SetFont( &Display, lines[num].font );	
 	if (attribute & DISPLAY_MONOSPACE) SSD13x6_FontForceMonospace( &Display, true );
 	
@@ -237,7 +247,8 @@ static bool line(int num, int x, int attribute, char *text) {
 	ESP_LOGD(TAG, "displaying %s line %u (x:%d, attr:%u)", text, num+1, x, attribute);
 	
 	// update whole display if requested
-	if (attribute & DISPLAY_UPDATE) SSD13x6_Update( &Display );
+	if (attribute & DISPLAY_UPDATE) update();
+	else SSD13x6_display.dirty = true;
 	
 	return width + x < Display.Width;
 }
@@ -278,13 +289,14 @@ static int stretch(int num, char *string, int max) {
 static void text(enum display_font_e font, enum display_pos_e pos, int attribute, char *text, ...) {
 	va_list args;

-	va_start(args, text);
 	TextAnchor Anchor = TextAnchor_Center;	
 	
 	if (attribute & DISPLAY_CLEAR) SSD13x6_Clear( &Display, SSD_COLOR_BLACK );
 	
 	if (!text) return;
 	
+	va_start(args, text);
+	
 	switch(font) {
 	case DISPLAY_FONT_LINE_1:	
 		SSD13x6_SetFont( &Display, &Font_line_1 );
@@ -327,127 +339,82 @@ static void text(enum display_font_e font, enum display_pos_e pos, int attribute
 	
 	ESP_LOGD(TAG, "SSDD13x6 displaying %s at %u with attribute %u", text, Anchor, attribute);
 	
-	if (AddressMode != AddressMode_Horizontal) {
-		AddressMode = AddressMode_Horizontal;
-		SSD13x6_SetDisplayAddressMode( &Display, AddressMode );
-	}	
-	
 	SSD13x6_FontDrawAnchoredString( &Display, Anchor, text, SSD_COLOR_WHITE );
-	if (attribute & DISPLAY_UPDATE) SSD13x6_Update( &Display );
+	if (attribute & DISPLAY_UPDATE) update();
+	else SSD13x6_display.dirty = true;
 	
 	va_end(args);
 }

 /****************************************************************************************
- * Process graphic display data from column-oriented bytes, MSbit first
+ * Process graphic display data from column-oriented data (MSbit first)
 */
-static void draw_cbr(u8_t *data, int height) {
-#ifndef FULL_REFRESH
-	// force addressing mode by rows
-	if (AddressMode != AddressMode_Horizontal) {
-		AddressMode = AddressMode_Horizontal;
-		SSD13x6_SetDisplayAddressMode( &Display, AddressMode );
-	}
+static void draw_cbr(u8_t *data, int width, int height) {
+	if (!height) height = Display.Height;
+	if (!width) width = Display.Width;

-	// try to minimize I2C traffic which is very slow
-	int rows = (height ? height : Display.Height) / 8;
+	// need to do row/col swap and bit-reverse
+	int rows = height / 8;
 	for (int r = 0; r < rows; r++) {
-		uint8_t first = 0, last;	
 		uint8_t *optr = Display.Framebuffer + r*Display.Width, *iptr = data + r;
-		
-		// row/col swap, frame buffer comparison and bit-reversing
-		for (int c = 0; c < Display.Width; c++) {
-			u8_t byte = BitReverseTable256[*iptr];
-			if (byte != *optr) {
-				if (!first) first = c + 1;
-				last = c ;
-			}	
-			*optr++ = byte;
+		for (int c = width; --c >= 0;) {
+			*optr++ = BitReverseTable256[*iptr];;
 			iptr += rows;
 		}	
-		
-		// now update the display by "byte rows"
-		if (first--) {
-			SSD13x6_SetColumnAddress( &Display, first, last );
-			SSD13x6_SetPageAddress( &Display, r, r);
-			SSD13x6_WriteRawData( &Display, Display.Framebuffer + r*Display.Width + first, last - first + 1);
-		}
-	}	
-#else
-	if (!height) height = Display->Height;
-
-	SSD13x6_SetPageAddress( &Display, 0, height / 8 - 1);
-	
-	// force addressing mode by columns (if we can)
-	if (SSD13x6_GetCaps( &Display ) & CAPS_ADDRESS_VERTICAL) {
-		// just copy data in frame buffer with bit-reverse	
-		for (int c = 0; c < Display.Width; c++)
-			for (int r = 0; r < height / 8; r++)
-				Display.Framebuffer[c*Display.Height/8 + r] = BitReverseTable256[data[c*height/8 +r]];
-
-		if (AddressMode != AddressMode_Vertical) {
-			AddressMode = AddressMode_Vertical;
-			SSD13x6_SetDisplayAddressMode( &Display, AddressMode );
-		}
-	} else {	
-		// need to do rwo/col swap and bit-reverse
-		int rows = (height ? height : Display.Height) / 8;
-		for (int r = 0; r < rows; r++) {
-			uint8_t *optr = Display.Framebuffer + r*Display.Width, *iptr = data + r;
-			for (int c = 0; c < Display.Width; c++) {
-				*optr++ = BitReverseTable256[*iptr];;
-				iptr += rows;
-			}	
-		}
-		ESP_LOGW(TAG, "Can't set addressing mode to vertical, swapping");
 	}
 	
-	SSD13x6_WriteRawData(&Display, Display.Framebuffer, Display.Width * Display.Height/8);
- #endif	
+	SSD13x6_display.dirty = true;
 }

 /****************************************************************************************
 * Process graphic display data MSBit first
 * WARNING: this has not been tested yet
 */
-static void draw(int x1, int y1, int x2, int y2, bool by_column, u8_t *data) {
-	
-	if (y1 % 8 || y2 % 8) {
-		ESP_LOGW(TAG, "must write rows on byte boundaries (%u,%u) to (%u,%u)", x1, y1, x2, y2);
-		return;
-	}
-	
+static void draw_raw(int x1, int y1, int x2, int y2, bool by_column, bool MSb, u8_t *data) {
 	// default end point to display size
 	if (x2 == -1) x2 = Display.Width - 1;
 	if (y2 == -1) y2 = Display.Height - 1;
 	
-	// set addressing mode to match data
-	if (by_column) {
+	display->dirty = true;
 	
-		if (AddressMode != AddressMode_Vertical) {
-			AddressMode = AddressMode_Vertical;
-			SSD13x6_SetDisplayAddressMode( &Display, AddressMode );
-		}	
-		
-		// copy the window and do row/col exchange
-		for (int r = y1/8; r <=  y2/8; r++) {
-			uint8_t *optr = Display.Framebuffer + r*Display.Width + x1, *iptr = data + r;
-			for (int c = x1; c <= x2; c++) {
-				*optr++ = *iptr;
-				iptr += (y2-y1)/8 + 1;
+	//	not a boundary draw
+	if (y1 % 8 || y2 % 8 || x1 % 8 | x2 % 8) {
+		ESP_LOGW(TAG, "can't write on non cols/rows boundaries for now");
+	} else {	
+		// set addressing mode to match data
+		if (by_column) {
+			// copy the window and do row/col exchange
+			for (int r = y1/8; r <=  y2/8; r++) {
+				uint8_t *optr = Display.Framebuffer + r*Display.Width + x1, *iptr = data + r;
+				for (int c = x1; c <= x2; c++) {
+					*optr++ = MSb ? BitReverseTable256[*iptr] : *iptr;
+					iptr += (y2-y1)/8 + 1;
+			}	
+			}	
+		} else {
+			// just copy the window inside the frame buffer
+			for (int r = y1/8; r <= y2/8; r++) {
+				uint8_t *optr = Display.Framebuffer + r*Display.Width + x1, *iptr = data + r*(x2-x1+1);
+				for (int c = x1; c <= x2; c++) *optr++ = *iptr++;
 			}	
 		}
-	} else {
-		// just copy the window inside the frame buffer
-		for (int r = y1/8; r <= y2/8; r++) {
-			uint8_t *optr = Display.Framebuffer + r*Display.Width + x1, *iptr = data + r*(x2-x1+1);
-			for (int c = x1; c <= x2; c++) *optr++ = *iptr++;
-		}	
 	}	
+}

-	SSD13x6_SetColumnAddress( &Display, x1, x2);
-	SSD13x6_SetPageAddress( &Display, y1/8, y2/8);
-	SSD13x6_WriteRawData( &Display, data, (x2-x1 + 1) * ((y2-y1)/8 + 1));
+/****************************************************************************************
+ * Draw line
+ */
+static void draw_line( int x1, int y1, int x2, int y2) {
+	SSD13x6_DrawLine( &Display, x1, y1, x2, y2, SSD_COLOR_WHITE );
+	SSD13x6_display.dirty = true;
+}
+
+/****************************************************************************************
+ * Draw Box
+ */
+static void draw_box( int x1, int y1, int x2, int y2, bool fill) {
+	SSD13x6_DrawBox( &Display, x1, y1, x2, y2, SSD_COLOR_WHITE, fill );
+	SSD13x6_display.dirty = true;
 }

 /****************************************************************************************
@@ -470,7 +437,8 @@ static void on(bool state) {
 * Update 
 */
 static void update(void) {
-	SSD13x6_Update( &Display );
+	if (SSD13x6_display.dirty) SSD13x6_Update( &Display );
+	SSD13x6_display.dirty = false;
 }


--- a/components/display/tarablessd13x6/ssd13x6.c
+++ b/components/display/tarablessd13x6/ssd13x6.c
@@ -15,6 +15,8 @@

 #include "ssd13x6.h"

+#define SHADOW_BUFFER
+
 // used by both but different
 static uint8_t SSDCmd_Set_Display_Start_Line;
 static uint8_t SSDCmd_Set_Display_Offset;
@@ -111,8 +113,32 @@ void SSD13x6_SetDisplayAddressMode( struct SSD13x6_Device* DeviceHandle, SSD13x6
 }

 void SSD13x6_Update( struct SSD13x6_Device* DeviceHandle ) {
+#ifdef SHADOW_BUFFER
+	// not sure the compiler does not have to redo all calculation in for loops, so local it is
+	int width = DeviceHandle->Width, rows = DeviceHandle->Height / 8;
+	uint8_t *optr = DeviceHandle->Shadowbuffer, *iptr = DeviceHandle->Framebuffer;
+	
+	// by row, find first and last columns that have been updated
+	for (int r = 0; r < rows; r++) {
+		uint8_t first = 0, last;	
+		for (int c = 0; c < width; c++) {
+			if (*iptr != *optr) {
+				if (!first) first = c + 1;
+				last = c ;
+			}	
+			*optr++ = *iptr++;
+		}
+		
+		// now update the display by "byte rows"
+		if (first--) {
+			SSD13x6_SetColumnAddress( DeviceHandle, first, last );
+			SSD13x6_SetPageAddress( DeviceHandle, r, r);
+			SSD13x6_WriteData( DeviceHandle, DeviceHandle->Shadowbuffer + r*width + first, last - first + 1);
+		}
+	}	
+#else	
 	if (DeviceHandle->Model == SH1106) {
-		// SH1106 requires a page-by-page update and ahs no end Page/Column
+		// SH1106 requires a page-by-page update and has no end Page/Column
 		for (int i = 0; i < DeviceHandle->Height / 8 ; i++) {
 			SSD13x6_SetPageAddress( DeviceHandle, i, 0);
 			SSD13x6_SetColumnAddress( DeviceHandle, 0, 0);			
@@ -124,6 +150,7 @@ void SSD13x6_Update( struct SSD13x6_Device* DeviceHandle ) {
 		SSD13x6_SetPageAddress( DeviceHandle, 0, DeviceHandle->Height / 8 - 1);
 		SSD13x6_WriteData( DeviceHandle, DeviceHandle->Framebuffer, DeviceHandle->FramebufferSize );
 	}	
+#endif	
 }

 void SSD13x6_WriteRawData( struct SSD13x6_Device* DeviceHandle, uint8_t* Data, size_t DataLength ) {
@@ -214,6 +241,11 @@ static bool SSD13x6_Init( struct SSD13x6_Device* DeviceHandle, int Width, int He
    DeviceHandle->Width = Width;
    DeviceHandle->Height = Height;
 	
+#ifdef SHADOW_BUFFER
+	DeviceHandle->Shadowbuffer = heap_caps_malloc( DeviceHandle->FramebufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA );
+	memset( DeviceHandle->Shadowbuffer, 0xFF, DeviceHandle->FramebufferSize );
+#endif	
+	
 	SSD13x6_HWReset( DeviceHandle );
 	SSD13x6_DisplayOff( DeviceHandle );

@@ -308,7 +340,11 @@ bool SSD13x6_Init_SPI( struct SSD13x6_Device* DeviceHandle, int Width, int Heigh
    DeviceHandle->CSPin = CSPin;
 	
 	DeviceHandle->FramebufferSize = ( Width * Height ) / 8;
+#ifdef SHADOW_BUFFER	
+	DeviceHandle->Framebuffer = calloc( 1, DeviceHandle->FramebufferSize );
+#else	
    DeviceHandle->Framebuffer = heap_caps_calloc( 1, DeviceHandle->FramebufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA );
+#endif
    NullCheck( DeviceHandle->Framebuffer, return false );
 	
    return SSD13x6_Init( DeviceHandle, Width, Height );
--- a/components/display/tarablessd13x6/ssd13x6.h
+++ b/components/display/tarablessd13x6/ssd13x6.h
@@ -58,7 +58,7 @@ struct SSD13x6_Device {

 	enum { SSD1306, SSD1326, SH1106 } Model;
 	uint8_t ReMap;
-    uint8_t* Framebuffer;
+    uint8_t* Framebuffer, *Shadowbuffer;
    int FramebufferSize;

    WriteCommandProc WriteCommand;
--- a/components/display/tarablessd13x6/ssd13x6_draw.c
+++ b/components/display/tarablessd13x6/ssd13x6_draw.c
@@ -16,6 +16,9 @@
 #include "ssd13x6.h"
 #include "ssd13x6_draw.h"

+#undef NullCheck
+#define NullCheck(X,Y)
+
 __attribute__( ( always_inline ) ) static inline bool IsPixelVisible( struct SSD13x6_Device* DeviceHandle, int x, int y )  {
    bool Result = (
        ( x >= 0 ) &&
@@ -75,7 +78,7 @@ void IRAM_ATTR SSD13x6_DrawHLine( struct SSD13x6_Device* DeviceHandle, int x, in
    NullCheck( DeviceHandle, return );
    NullCheck( DeviceHandle->Framebuffer, return );

-    for ( ; x <= XEnd; x++ ) {
+    for ( ; x < XEnd; x++ ) {
        if ( IsPixelVisible( DeviceHandle, x, y ) == true ) {
            SSD13x6_DrawPixelFast( DeviceHandle, x, y, Color );
        } else {
@@ -90,7 +93,7 @@ void IRAM_ATTR SSD13x6_DrawVLine( struct SSD13x6_Device* DeviceHandle, int x, in
    NullCheck( DeviceHandle, return );
    NullCheck( DeviceHandle->Framebuffer, return );

-    for ( ; y <= YEnd; y++ ) {
+    for ( ; y < YEnd; y++ ) {
        if ( IsPixelVisible( DeviceHandle, x, y ) == true ) {
            SSD13x6_DrawPixel( DeviceHandle, x, y, Color );
        } else {
@@ -114,7 +117,7 @@ static inline void IRAM_ATTR DrawWideLine( struct SSD13x6_Device* DeviceHandle,

    Error = ( dy * 2 ) - dx;

-    for ( ; x <= x1; x++ ) {
+    for ( ; x < x1; x++ ) {
        if ( IsPixelVisible( DeviceHandle, x, y ) == true ) {
            SSD13x6_DrawPixelFast( DeviceHandle, x, y, Color );
        }
@@ -219,3 +222,32 @@ void SSD13x6_Clear( struct SSD13x6_Device* DeviceHandle, int Color ) {

    memset( DeviceHandle->Framebuffer, Color, DeviceHandle->FramebufferSize );
 }
+
+void SSD13x6_ClearWindow( struct SSD13x6_Device* DeviceHandle, int x1, int y1, int x2, int y2, int Color ) {
+    NullCheck( DeviceHandle, return );
+    NullCheck( DeviceHandle->Framebuffer, return );
+	
+/*	
+	int xr = ((x1 - 1) / 8) + 1 ) * 8;
+	int xl = (x2 / 8) * 8;
+	
+	for (int y = y1; y <= y2; y++) {
+		for (int x = x1; x < xr; x++) SSD13x6_DrawPixelFast( DeviceHandle, x, y, Color);
+		if (xl > xr) memset( DeviceHandle->Framebuffer + (y / 8) * DeviceHandle->Width + xr, 0, xl - xr );
+		for (int x = xl; x <= x2; x++) SSD13x6_DrawPixelFast( DeviceHandle, x, y, Color);
+	}
+	
+	return;
+*/	
+		
+	// cheap optimization on boundaries
+	if (x1 == 0 && x2 == DeviceHandle->Width - 1 && y1 % 8 == 0 && (y2 + 1) % 8 == 0) {
+		memset( DeviceHandle->Framebuffer + (y1 / 8) * DeviceHandle->Width, 0, (y2 - y1 + 1) / 8 * DeviceHandle->Width );
+	} else {
+		for (int y = y1; y <= y2; y++) {
+			for (int x = x1; x <= x2; x++) {
+				SSD13x6_DrawPixelFast( DeviceHandle, x, y, Color);
+			}		
+		}	
+	}	
+}
--- a/components/display/tarablessd13x6/ssd13x6_draw.h
+++ b/components/display/tarablessd13x6/ssd13x6_draw.h
@@ -39,6 +39,7 @@ extern "C" {
 #define SSD_COLOR_XOR 2

 void SSD13x6_Clear( struct SSD13x6_Device* DeviceHandle, int Color );
+void SSD13x6_ClearWindow( struct SSD13x6_Device* DeviceHandle, int x1, int y1, int x2, int y2, int Color );
 void SSD13x6_DrawPixel( struct SSD13x6_Device* DeviceHandle, int X, int Y, int Color );
 void SSD13x6_DrawPixelFast( struct SSD13x6_Device* DeviceHandle, int X, int Y, int Color );
 void SSD13x6_DrawHLine( struct SSD13x6_Device* DeviceHandle, int x, int y, int Width, int Color );
--- a/components/services/monitor.c
+++ b/components/services/monitor.c
@@ -146,4 +146,10 @@ void monitor_svc_init(void) {
 		xTimerStart(monitor_timer, portMAX_DELAY);
 	}	
 	free(p);
+	
+	ESP_LOGI(TAG, "Heap internal:%zu (min:%zu) external:%zu (min:%zu)", 
+			heap_caps_get_free_size(MALLOC_CAP_INTERNAL),
+			heap_caps_get_minimum_free_size(MALLOC_CAP_INTERNAL),
+			heap_caps_get_free_size(MALLOC_CAP_SPIRAM),
+			heap_caps_get_minimum_free_size(MALLOC_CAP_SPIRAM));
 }
--- a/components/squeezelite/display.c
+++ b/components/squeezelite/display.c
@@ -18,6 +18,8 @@
 */

 #include <ctype.h>
+#include <math.h>
+#include "esp_dsp.h"
 #include "squeezelite.h"
 #include "slimproto.h"
 #include "display.h"
@@ -54,6 +56,21 @@ struct grfg_packet {
 	u16_t  width;		// # of pixels of scrollable
 };

+struct visu_packet {
+	char  opcode[4];
+	u8_t which;
+	u8_t count;
+	union {
+		u32_t width;
+		u32_t full_bars;
+	};	
+	u32_t height;
+	s32_t col;
+	s32_t row;	
+	u32_t border;
+	u32_t small_bars;	
+};
+
 struct ANIC_header {
 	char  opcode[4];
 	u32_t length;
@@ -64,20 +81,59 @@ struct ANIC_header {

 extern struct outputstate output;

+static struct {
+	TaskHandle_t task;
+	SemaphoreHandle_t mutex;
+} displayer;	
+
+#define LONG_WAKE 		(10*1000)
+#define SB_HEIGHT		32
+
+// lenght are number of frames, i.e. 2 channels of 16 bits
+#define	FFT_LEN_BIT	6		
+#define	FFT_LEN		(1 << FFT_LEN_BIT)
+#define RMS_LEN_BIT	6
+#define RMS_LEN		(1 << RMS_LEN_BIT)
+
+// actually this is 2x the displayed BW
+#define DISPLAY_BW	32000
+
 static struct scroller_s {
 	// copy of grfs content
-	u8_t  screen, direction;	
+	u8_t  screen;	
 	u32_t pause, speed;
-	u16_t by, mode, full_width, window_width;		
-	u16_t max, size;
+	int wake;	
+	u16_t mode;	
+	s16_t by;
 	// scroller management & sharing between grfg and scrolling task
-	TaskHandle_t task;
-	u8_t *scroll_frame, *back_frame;
-	bool active, updated;
-	u8_t *scroll_ptr;
-	int scroll_len, scroll_step;
+	bool active, first;
+	int scrolled;
+	struct {
+		u8_t *frame;
+		u32_t width;
+		u32_t max, size;
+	} scroll;
+	struct {
+		u8_t *frame;
+		u32_t width;
+	} back;
+	u8_t *frame;
+	u32_t width;
 } scroller;

+#define MAX_BARS	32
+static EXT_RAM_ATTR struct {
+	int bar_gap, bar_width, bar_border;
+	struct {
+		int current;
+		int max;
+	} bars[MAX_BARS];
+	int n, col, row, height, width, border;
+	enum { VISU_BLANK, VISU_VUMETER, VISU_SPECTRUM, VISU_WAVEFORM } mode;
+	int speed, wake;	
+	float fft[FFT_LEN*2], samples[FFT_LEN*2], hanning[FFT_LEN];
+} visu;
+
 #define ANIM_NONE		  0x00
 #define ANIM_TRANSITION   0x01 // A transition animation has finished
 #define ANIM_SCROLL_ONCE  0x02 
@@ -91,11 +147,11 @@ static u8_t SETD_width;
 #define LINELEN				40

 static log_level loglevel = lINFO;
-static SemaphoreHandle_t display_mutex;
 static bool (*slimp_handler_chain)(u8_t *data, int len);
 static void (*slimp_loop_chain)(void);
 static void (*notify_chain)(in_addr_t ip, u16_t hport, u16_t cport);
 static int display_width, display_height;
+static bool display_dirty = true;

 #define max(a,b) (((a) > (b)) ? (a) : (b))

@@ -107,7 +163,9 @@ static void grfe_handler( u8_t *data, int len);
 static void grfb_handler(u8_t *data, int len);
 static void grfs_handler(u8_t *data, int len);
 static void grfg_handler(u8_t *data, int len);
-static void scroll_task(void* arg);
+static void visu_handler( u8_t *data, int len);
+
+static void displayer_task(void* arg);

 /* scrolling undocumented information
 	grfs	
@@ -151,17 +209,24 @@ bool sb_display_init(void) {
 	
 	// need to force height to 32 maximum
 	display_width = display->width;
-	display_height = min(display->height, 32);
+	display_height = min(display->height, SB_HEIGHT);
 	SETD_width = display->width;

+	// create visu configuration
+	visu.bar_gap = 1;
+	visu.speed = 100;
+	dsps_fft2r_init_fc32(visu.fft, FFT_LEN);
+	dsps_wind_hann_f32(visu.hanning, FFT_LEN);
+		
 	// create scroll management task
-	display_mutex = xSemaphoreCreateMutex();
-	scroller.task = xTaskCreateStatic( (TaskFunction_t) scroll_task, "scroll_thread", SCROLL_STACK_SIZE, NULL, ESP_TASK_PRIO_MIN + 1, xStack, &xTaskBuffer);
+	displayer.mutex = xSemaphoreCreateMutex();
+	displayer.task = xTaskCreateStatic( (TaskFunction_t) displayer_task, "displayer_thread", SCROLL_STACK_SIZE, NULL, ESP_TASK_PRIO_MIN + 1, xStack, &xTaskBuffer);
 	
 	// size scroller
-	scroller.max = (display_width * display_height / 8) * 10;
-	scroller.scroll_frame = malloc(scroller.max);
-	scroller.back_frame = malloc(display_width * display_height / 8);
+	scroller.scroll.max = (display_width * display_height / 8) * 10;
+	scroller.scroll.frame = malloc(scroller.scroll.max);
+	scroller.back.frame = malloc(display_width * display_height / 8);
+	scroller.frame = malloc(display_width * display_height / 8);

 	// chain handlers
 	slimp_handler_chain = slimp_handler;
@@ -225,6 +290,8 @@ static void server(in_addr_t ip, u16_t hport, u16_t cport) {
 	char msg[32];
 	sprintf(msg, "%s:%hu", inet_ntoa(ip), hport);
 	display->text(DISPLAY_FONT_DEFAULT, DISPLAY_CENTERED, DISPLAY_CLEAR | DISPLAY_UPDATE, msg);
+	SETD_width = display->width;
+	display_dirty = true;
 	if (notify_chain) (*notify_chain)(ip, hport, cport);
 }

@@ -246,6 +313,8 @@ static bool handler(u8_t *data, int len){
 			grfs_handler(data, len);		
 		} else if (!strncmp((char*) data, "grfg", 4)) {
 			grfg_handler(data, len);
+		} else if (!strncmp((char*) data, "visu", 4)) {
+			visu_handler(data, len);
 		} else {
 			res = false;
 		}
@@ -374,12 +443,27 @@ static void vfdc_handler( u8_t *_data, int bytes_read) {
 * Process graphic display data
 */
 static void grfe_handler( u8_t *data, int len) {
-	xSemaphoreTake(display_mutex, portMAX_DELAY);
+		
+	xSemaphoreTake(displayer.mutex, portMAX_DELAY);
 	
 	scroller.active = false;
-	display->draw_cbr(data + sizeof(struct grfe_packet), display_height);
 	
-	xSemaphoreGive(display_mutex);
+	// if we are displaying visu on a small screen, do not do screen update
+	if (visu.mode && !visu.col && visu.row < SB_HEIGHT) {
+		xSemaphoreGive(displayer.mutex);
+		return;
+	}	
+	
+	// did we have something that might have write on the bottom of a SB_HEIGHT+ display
+	if (display_dirty) {
+		display->clear(true);
+		display_dirty = false;
+	}	
+	
+	display->draw_cbr(data + sizeof(struct grfe_packet), display_width, display_height);
+	display->update();
+	
+	xSemaphoreGive(displayer.mutex);
 	
 	LOG_DEBUG("grfe frame %u", len);
 }	
@@ -415,36 +499,46 @@ static void grfs_handler(u8_t *data, int len) {
 				htonl(pkt->pause),		// in ms	
 				htonl(pkt->speed),		// in ms
 				htons(pkt->by),			// # of pixel of scroll step
-				htons(pkt->mode),			// 0=continuous, 1=once and stop, 2=once and end
-				htons(pkt->width),		// total width of animation
+				htons(pkt->mode),		// 0=continuous, 1=once and stop, 2=once and end
+				htons(pkt->width),		// last column of animation that contains a "full" screen
 				htons(pkt->offset)		// offset if multiple packets are sent
 	);
 	
 	// new grfs frame, build scroller info
 	if (!offset) {	
 		// use the display as a general lock
-		xSemaphoreTake(display_mutex, portMAX_DELAY);
+		xSemaphoreTake(displayer.mutex, portMAX_DELAY);

 		// copy & set scroll parameters
 		scroller.screen = pkt->screen;
-		scroller.direction = pkt->direction;
 		scroller.pause = htonl(pkt->pause);
 		scroller.speed = htonl(pkt->speed);
-		scroller.by = htons(pkt->by);
 		scroller.mode = htons(pkt->mode);
-		scroller.full_width = htons(pkt->width);
-		scroller.updated = scroller.active = true;
+		scroller.scroll.width = htons(pkt->width);
+		scroller.first = true;
 		
-		xSemaphoreGive(display_mutex);
+		// background excludes space taken by visu (if any)
+		scroller.back.width = display_width - ((visu.mode && visu.row < SB_HEIGHT) ? visu.width : 0);
+
+		// set scroller steps & beginning
+		if (pkt->direction == 1) {
+			scroller.scrolled = 0;
+			scroller.by = htons(pkt->by);
+		} else {
+			scroller.scrolled = scroller.scroll.width;
+			scroller.by = -htons(pkt->by);
+		}	
+
+		xSemaphoreGive(displayer.mutex);
 	}	

 	// copy scroll frame data (no semaphore needed)
-	if (scroller.size + size < scroller.max) {
-		memcpy(scroller.scroll_frame + offset, data + sizeof(struct grfs_packet), size);
-		scroller.size = offset + size;
-		LOG_INFO("scroller current size %u", scroller.size);
+	if (scroller.scroll.size + size < scroller.scroll.max) {
+		memcpy(scroller.scroll.frame + offset, data + sizeof(struct grfs_packet), size);
+		scroller.scroll.size = offset + size;
+		LOG_INFO("scroller current size %u", scroller.scroll.size);
 	} else {
-		LOG_INFO("scroller too larger %u/%u", scroller.size + size, scroller.max);
+		LOG_INFO("scroller too larger %u/%u", scroller.scroll.size + size, scroller.scroll.max);
 	}	
 }

@@ -456,109 +550,273 @@ static void grfg_handler(u8_t *data, int len) {
 	
 	LOG_DEBUG("gfrg s:%hu w:%hu (len:%u)", htons(pkt->screen), htons(pkt->width), len);
 	
-	memcpy(scroller.back_frame, data + sizeof(struct grfg_packet), len - sizeof(struct grfg_packet));
-	scroller.window_width = htons(pkt->width);
+	xSemaphoreTake(displayer.mutex, portMAX_DELAY);
 	
-	xSemaphoreTake(display_mutex, portMAX_DELAY);
+	// size of scrollable area (less than background)
+	scroller.width = htons(pkt->width);
+	memcpy(scroller.back.frame, data + sizeof(struct grfg_packet), len - sizeof(struct grfg_packet));
 		
-	// can't be in grfs as we need full size & scroll_width
-	if (scroller.updated) {
-		scroller.scroll_len = display_width * display_height / 8 - (display_width - scroller.window_width) * display_height / 8;
-		if (scroller.direction == 1) {
-			scroller.scroll_ptr = scroller.scroll_frame; 
-			scroller.scroll_step = scroller.by * display_height / 8;
-		} else	{
-			scroller.scroll_ptr = scroller.scroll_frame + scroller.size - scroller.scroll_len;
-			scroller.scroll_step = -scroller.by * display_height / 8;
+	// update display asynchronously (frames are oganized by columns)
+	memcpy(scroller.frame, scroller.back.frame, scroller.back.width * display_height / 8);
+	for (int i = 0; i < scroller.width * display_height / 8; i++) scroller.frame[i] |= scroller.scroll.frame[scroller.scrolled * display_height / 8 + i];
+	display->draw_cbr(scroller.frame, scroller.back.width, display_height);
+	display->update();
+		
+	// now we can active scrolling, but only if we are not on a small screen
+	if (!visu.mode || visu.col || visu.row >= SB_HEIGHT) scroller.active = true;
+		
+	// if we just got a content update, let the scroller manage the screen
+	LOG_DEBUG("resuming scrolling task");
+			
+	xSemaphoreGive(displayer.mutex);
+	
+	// resume task once we have background, not in grfs
+	vTaskResume(displayer.task);
+}
+
+/****************************************************************************************
+ * Update visualization bars
+ */
+static void visu_update(void) {
+	if (pthread_mutex_trylock(&visu_export.mutex)) return;
+				
+	// not enough samples
+	if (visu_export.level < (visu.mode == VISU_VUMETER ? RMS_LEN : FFT_LEN) * 2 && visu_export.running) {
+		pthread_mutex_unlock(&visu_export.mutex);
+		return;
+	}
+	
+	// reset bars for all cases first	
+	for (int i = visu.n; --i >= 0;) visu.bars[i].current = 0;
+	
+	if (visu_export.running && visu_export.running) {
+					
+		if (visu.mode == VISU_VUMETER) {
+			s16_t *iptr = visu_export.buffer;
+			
+			// calculate sum(X²), try to not overflow at the expense of some precision
+			for (int i = RMS_LEN; --i >= 0;) {
+				visu.bars[0].current += (*iptr * *iptr + (1 << (RMS_LEN_BIT - 2))) >> (RMS_LEN_BIT - 1);
+				iptr++;
+				visu.bars[1].current += (*iptr * *iptr + (1 << (RMS_LEN_BIT - 2))) >> (RMS_LEN_BIT - 1);
+				iptr++;
+			}	
+		
+			// convert to dB (1 bit remaining for getting X²/N, 60dB dynamic starting from 0dBFS = 3 bits back-off)
+			for (int i = visu.n; --i >= 0;) {	 
+				visu.bars[i].current = 32 * (0.01667f*10*log10f(0.0000001f + (visu.bars[i].current >> 1)) - 0.2543f);
+				if (visu.bars[i].current > 31) visu.bars[i].current = 31;
+				else if (visu.bars[i].current < 0) visu.bars[i].current = 0;
+			}
+		} else {
+			// on xtensa/esp32 the floating point FFT takes 1/2 cycles of the fixed point
+			for (int i = 0 ; i < FFT_LEN ; i++) {
+				// don't normalize here, but we are due INT16_MAX and FFT_LEN / 2 / 2
+				visu.samples[i * 2 + 0] = (float) (visu_export.buffer[2*i] + visu_export.buffer[2*i + 1]) * visu.hanning[i];
+				visu.samples[i * 2 + 1] = 0;
+			}
+
+			// actual FFT that might be less cycle than all the crap below		
+			dsps_fft2r_fc32_ae32(visu.samples, FFT_LEN);
+			dsps_bit_rev_fc32_ansi(visu.samples, FFT_LEN);
+			
+			// now arrange the result with the number of bar and sampling rate (don't want DC)
+			for (int i = 1, j = 1; i <= visu.n && j < (FFT_LEN / 2); i++) {
+				float power, count;
+
+				// find the next point in FFT (this is real signal, so only half matters)
+				for (count = 0, power = 0; j * visu.n * visu_export.rate < i * (FFT_LEN / 2) * DISPLAY_BW && j < (FFT_LEN / 2); j++, count += 1) {
+					power += visu.samples[2*j] * visu.samples[2*j] + visu.samples[2*j+1] * visu.samples[2*j+1];
+				}
+				// due to sample rate, we have reached the end of the available spectrum
+				if (j >= (FFT_LEN / 2)) {
+					// normalize accumulated data
+					if (count) power /= count * 2.;
+				} else if (count) {
+					// how much of what remains do we need to add
+					float ratio = j - (float) (i * DISPLAY_BW * (FFT_LEN / 2)) / (float) (visu.n * visu_export.rate);
+					power += (visu.samples[2*j] * visu.samples[2*j] + visu.samples[2*j+1] * visu.samples[2*j+1]) * ratio;
+					
+					// normalize accumulated data
+					power /= (count + ratio) * 2;
+				} else {
+					// no data for that band (sampling rate too high), just assume same as previous one
+					power = (visu.samples[2*j] * visu.samples[2*j] + visu.samples[2*j+1] * visu.samples[2*j+1]) / 2.;
+				}	
+			
+				// convert to dB and bars, same back-off
+				if (power) visu.bars[i-1].current = 32 * (0.01667f*10*(log10f(power) - log10f(FFT_LEN/2*2)) - 0.2543f);
+				if (visu.bars[i-1].current > 31) visu.bars[i-1].current = 31;
+				else if (visu.bars[i-1].current < 0) visu.bars[i-1].current = 0;
+			}	
+		}
+	} 
+		
+	// we took what we want, we can release the buffer
+	visu_export.level = 0;
+	pthread_mutex_unlock(&visu_export.mutex);
+
+	display->clear(false, false, visu.col, visu.row, visu.col + visu.width - 1, visu.row + visu.height - 1);
+	
+	for (int i = visu.n; --i >= 0;) {
+		int x1 = visu.col + visu.border + visu.bar_border + i*(visu.bar_width + visu.bar_gap);
+		int y1 = visu.row + visu.height - 1;
+			
+		if (visu.bars[i].current > visu.bars[i].max) visu.bars[i].max = visu.bars[i].current;
+		else if (visu.bars[i].max) visu.bars[i].max--;
+			
+		for (int j = 0; j <= visu.bars[i].current; j += 2) 
+			display->draw_line( x1, y1 - j, x1 + visu.bar_width - 1, y1 - j);
+			
+		if (visu.bars[i].max > 2) {
+			display->draw_line( x1, y1 - visu.bars[i].max, x1 + visu.bar_width - 1, y1 - visu.bars[i].max);			
+			display->draw_line( x1, y1 - visu.bars[i].max + 1, x1 + visu.bar_width - 1, y1 - visu.bars[i].max + 1);			
+		}	
+	}
+}
+
+/****************************************************************************************
+ * Visu packet handler
+ */
+static void visu_handler( u8_t *data, int len) {
+	struct visu_packet *pkt = (struct visu_packet*) data;
+	int bars = 0;
+
+	LOG_DEBUG("visu %u with %u parameters", pkt->which, pkt->count);
+		
+	/* 
+	 If width is specified, then respect all coordinates, otherwise we try to 
+	 use the bottom part of the display and if it is a small display, we overwrite
+	 text
+	*/ 
+	
+	xSemaphoreTake(displayer.mutex, portMAX_DELAY);
+	visu.mode = pkt->which;
+	
+	// little trick to clean the taller screens when switching visu 
+	if (visu.row >= SB_HEIGHT) display->clear(false, true, visu.col, visu.row, visu.col + visu.width - 1, visu.row - visu.height - 1);
+	
+	if (visu.mode) {
+		pkt->width = htonl(pkt->width);
+		pkt->height = htonl(pkt->height);
+		pkt->row = htonl(pkt->row);
+		pkt->col = htonl(pkt->col);
+	
+		if (pkt->width > 0 && pkt->count >= 4) {
+			// small visu, then go were we are told to
+			visu.width = pkt->width;
+			visu.height = pkt->height ? pkt->height : SB_HEIGHT;
+			visu.col = pkt->col < 0 ? display->width + pkt->col : pkt->col;
+			visu.row = pkt->row < 0 ? display->height + pkt->row : pkt->row;
+			visu.border =  htonl(pkt->border);
+			bars = htonl(pkt->small_bars);
+		} else {
+			// full screen visu, try to use bottom screen if available
+			visu.width = display->width;
+			visu.height = display->height > SB_HEIGHT ? display->height - SB_HEIGHT : display->height;
+			visu.col = visu.border = 0;
+			visu.row = display->height - visu.height;			
+			// already in CPU order
+			bars = pkt->full_bars;
 		}
 		
-		scroller.updated = false;	
+		// try to adapt to what we have
+		visu.n = visu.mode == VISU_VUMETER ? 2 : (bars ? bars : MAX_BARS);
+		do {
+			visu.bar_width = (visu.width - visu.border - visu.bar_gap * (visu.n - 1)) / visu.n;
+			if (visu.bar_width > 0) break;
+		} while (--visu.n);	
+		visu.bar_border = (visu.width - visu.border - (visu.bar_width + visu.bar_gap) * visu.n + visu.bar_gap) / 2;
+		
+		// give up if not enough space
+		if (visu.bar_width < 0)	visu.mode = VISU_BLANK;
+		else vTaskResume(displayer.task);
+		visu.wake = 0;
+		
+		// reset bars maximum
+		for (int i = visu.n; --i >= 0;) visu.bars[i].max = 0;
+				
+		display->clear(false, true, visu.col, visu.row, visu.col + visu.width - 1, visu.row - visu.height - 1);
+		
+		LOG_INFO("Visualizer with %u bars of width %d:%d:%d:%d (%w:%u,h:%u,c:%u,r:%u)", visu.n, visu.bar_border, visu.bar_width, visu.bar_gap, visu.border, visu.width, visu.height, visu.col, visu.row);
+	} else {
+		LOG_INFO("Stopping visualizer");
 	}	
 	
-	if (!scroller.active) {
-		// this is a background update and scroller has been finished, so need to update here
-		u8_t *frame = malloc(display_width * display_height / 8);
-		memcpy(frame, scroller.back_frame, display_width * display_height / 8);
-		for (int i = 0; i < scroller.scroll_len; i++) frame[i] |= scroller.scroll_ptr[i];
-		display->draw_cbr(frame, display_height);		
-		free(frame);
-		LOG_DEBUG("direct drawing");
-	}	
-	else {
-		// if we just got a content update, let the scroller manage the screen
-		LOG_DEBUG("resuming scrolling task");
-		vTaskResume(scroller.task);
-	}
-	
-	xSemaphoreGive(display_mutex);
+	xSemaphoreGive(displayer.mutex);
 }	

 /****************************************************************************************
 * Scroll task
- */
-static void scroll_task(void *args) {
-	u8_t *frame = NULL;
-	int len = display_width * display_height / 8;
+ *  - with the addition of the visualizer, it's a bit a 2-headed beast not easy to 
+ * maintain, so som better separation between the visu and scroll is probably needed
+  */
+static void displayer_task(void *args) {
+	int sleep;
 	
 	while (1) {
-		xSemaphoreTake(display_mutex, portMAX_DELAY);
+		xSemaphoreTake(displayer.mutex, portMAX_DELAY);
 		
-		// suspend ourselves if nothing to do, grfg will wake us up
-		if (!scroller.active)  {
-			xSemaphoreGive(display_mutex);
+		// suspend ourselves if nothing to do, grfg or visu will wake us up
+		if (!scroller.active && !visu.mode)  {
+			xSemaphoreGive(displayer.mutex);
 			vTaskSuspend(NULL);
-			xSemaphoreTake(display_mutex, portMAX_DELAY);
+			xSemaphoreTake(displayer.mutex, portMAX_DELAY);
+			scroller.wake = visu.wake = 0;
 		}	
 		
-		// lock screen & active status
-		frame = malloc(display_width * display_height / 8);
+		// go for long sleep when either item is disabled
+		if (!visu.mode) visu.wake = LONG_WAKE;
+		if (!scroller.active) scroller.wake = LONG_WAKE;
 								
 		// scroll required amount of columns (within the window)
-		while (scroller.direction == 1 ? (scroller.scroll_ptr <= scroller.scroll_frame + scroller.size - scroller.scroll_step - len) :
-									     (scroller.scroll_ptr + scroller.scroll_step >= scroller.scroll_frame) ) {
+		if (scroller.active && scroller.wake <= 0) {
+			// by default go for the long sleep, will change below if required
+			scroller.wake = LONG_WAKE;
 			
-			// don't do anything if we have aborted
-			if (!scroller.active) break;
+			// do we have more to scroll (scroll.width is the last column from which we havea  full zone)
+			if (scroller.by > 0 ? (scroller.scrolled <= scroller.scroll.width) : (scroller.scrolled >= 0)) {
+				memcpy(scroller.frame, scroller.back.frame, scroller.back.width * display_height / 8);
+				for (int i = 0; i < scroller.width * display_height / 8; i++) scroller.frame[i] |= scroller.scroll.frame[scroller.scrolled * display_height / 8 + i];
+				scroller.scrolled += scroller.by;
+				display->draw_cbr(scroller.frame, scroller.width, display_height);	
 				
-			// scroll required amount of columns (within the window)
-			memcpy(frame, scroller.back_frame, display_width * display_height / 8);
-			for (int i = 0; i < scroller.scroll_len; i++) frame[i] |= scroller.scroll_ptr[i];
-			scroller.scroll_ptr += scroller.scroll_step;
-			display->draw_cbr(frame, display_height);		
+				// short sleep & don't need background update
+				scroller.wake = scroller.speed;
+			} else if (scroller.first || !scroller.mode) {
+				// at least one round done
+				scroller.first = false;
 				
-			xSemaphoreGive(display_mutex);
-	        vTaskDelay(scroller.speed / portTICK_PERIOD_MS);
+				// see if we need to pause or if we are done 				
+				if (scroller.mode) {
+					// can't call directly send_packet from slimproto as it's not re-entrant
+					ANIC_resp = ANIM_SCROLL_ONCE | ANIM_SCREEN_1;
+					LOG_INFO("scroll-once terminated");
+				} else {
+					scroller.wake = scroller.pause;
+					LOG_DEBUG("scroll cycle done, pausing for %u (ms)", scroller.pause);
+				}
 								
-			xSemaphoreTake(display_mutex, portMAX_DELAY);
-		}
-		
-		// done with scrolling cycle reset scroller ptr
-		scroller.scroll_ptr = scroller.scroll_frame + (scroller.direction == 2 ? scroller.size - scroller.scroll_len : 0);
-				
-		// scrolling done, update screen and see if we need to continue
-		if (scroller.active) {
-			memcpy(frame, scroller.back_frame, len);
-			for (int i = 0; i < scroller.scroll_len; i++) frame[i] |= scroller.scroll_ptr[i];
-			display->draw_cbr(frame, display_height);
-			free(frame);
-
-			// see if we need to pause or if we are done 				
-			if (scroller.mode) {
-				scroller.active = false;
-				xSemaphoreGive(display_mutex);
-				// can't call directly send_packet from slimproto as it's not re-entrant
-				ANIC_resp = ANIM_SCROLL_ONCE | ANIM_SCREEN_1;
-				LOG_INFO("scroll-once terminated");
-			} else {
-				xSemaphoreGive(display_mutex);
-				vTaskDelay(scroller.pause / portTICK_PERIOD_MS);
-				LOG_DEBUG("scroll cycle done, pausing for %u (ms)", scroller.pause);
+				// need to reset pointers for next scroll
+				scroller.scrolled = scroller.by < 0 ? scroller.scroll.width : 0;
 			} 
-		} else {
-			free(frame);
-			xSemaphoreGive(display_mutex);
-			LOG_INFO("scroll aborted");
 		}
+
+		// update visu if active
+		if (visu.mode && visu.wake <= 0) {
+			visu_update();
+			visu.wake = 100;
+		}
+		
+		display->update();
+		
+		// release semaphore and sleep what's needed
+		xSemaphoreGive(displayer.mutex);
+		
+		sleep = min(visu.wake, scroller.wake);
+		vTaskDelay(sleep / portTICK_PERIOD_MS);
+		scroller.wake -= sleep;
+		visu.wake -= sleep;
 	}	
 }	
 			
--- a/components/squeezelite/embedded.h
+++ b/components/squeezelite/embedded.h
@@ -54,6 +54,17 @@ void 		register_external(void);
 void 		deregister_external(void);
 void 		decode_restore(int external);

+// to be defined to nothing if you don't want to support these
+extern struct visu_export_s {
+	pthread_mutex_t mutex;
+	u32_t level, size, rate;
+	s16_t *buffer;
+	bool running;
+} visu_export;
+void 		output_visu_export(s16_t *frames, frames_t out_frames, u32_t rate, bool silence);
+void 		output_visu_init(log_level level);
+void 		output_visu_close(void);
+
 // optional, please chain if used 
 bool		(*slimp_handler)(u8_t *data, int len);
 void 		(*slimp_loop)(void);
--- a/components/squeezelite/output_embedded.c
+++ b/components/squeezelite/output_embedded.c
@@ -68,6 +68,8 @@ void output_init_embedded(log_level level, char *device, unsigned output_buf_siz
 		output_init_i2s(level, device, output_buf_size, params, rates, rate_delay, idle);
 	}	
 	
+	output_visu_init(level);
+	
 	LOG_INFO("init completed.");
 }	

@@ -75,6 +77,7 @@ void output_close_embedded(void) {
 	LOG_INFO("close output");
 	if (close_cb) (*close_cb)();		
 	output_close_common();
+	output_visu_close();
 }

 void set_volume(unsigned left, unsigned right) { 
--- a/components/squeezelite/output_i2s.c
+++ b/components/squeezelite/output_i2s.c
@@ -365,6 +365,9 @@ static int _i2s_write_frames(frames_t out_frames, bool silence, s32_t gainL, s32
 	_scale_and_pack_frames(obuf + oframes * bytes_per_frame, optr, out_frames, gainL, gainR, output.format);
 #endif	

+	// send data to visu
+	output_visu_export((s16_t*) (obuf + oframes * bytes_per_frame), out_frames, output.current_sample_rate, silence);
+
 	oframes += out_frames;
 	
 	return out_frames;
--- a/components/squeezelite/output_visu.c
+++ b/components/squeezelite/output_visu.c
@@ -0,0 +1,76 @@
+/* 
+ *  Squeezelite - lightweight headless squeezebox emulator
+ *
+ *  (c) Adrian Smith 2012-2015, triode1@btinternet.com
+ *      Ralph Irving 2015-2017, ralph_irving@hotmail.com
+ *		Philippe_44	 2020, philippe_44@outloook.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "squeezelite.h"
+
+#define VISUEXPORT_SIZE	2048
+
+EXT_BSS struct visu_export_s visu_export;
+static struct visu_export_s *visu = &visu_export;
+
+static log_level loglevel = lINFO;
+
+void output_visu_export(s16_t *frames, frames_t out_frames, u32_t rate, bool silence) {
+	
+	// no data to process
+	if (silence) {
+		visu->running = false;
+		return;
+	}	
+	
+	// do not block, try to stuff data put wait for consumer to have used them
+	if (!pthread_mutex_trylock(&visu->mutex)) {
+		// don't mix sample rates
+		if (visu->rate != rate) visu->level = 0;
+		
+		// stuff buffer up and wait for consumer to read it (should reset level)
+		if (visu->level < visu->size) {
+			u32_t space = min(visu->size - visu->level, out_frames * 2) * 2;
+			memcpy(visu->buffer + visu->level, frames, space);
+			
+			visu->level += space / 2;
+			visu->running = true;
+			visu->rate = rate ? rate : 44100;
+		}
+		
+		// mutex must be released 		
+		pthread_mutex_unlock(&visu->mutex);
+	} 
+}
+
+void output_visu_close(void) {
+	pthread_mutex_lock(&visu->mutex);
+	visu->running = false;
+	free(visu->buffer);
+	pthread_mutex_unlock(&visu->mutex);
+}
+
+void output_visu_init(log_level level) {
+	loglevel = level;
+	pthread_mutex_init(&visu->mutex, NULL);
+	visu->size = VISUEXPORT_SIZE;
+	visu->running = false;
+	visu->rate = 44100;
+	visu->buffer = malloc(VISUEXPORT_SIZE * sizeof(s16_t) * 2);
+	LOG_INFO("Initialize VISUEXPORT %u 16 bits samples", VISUEXPORT_SIZE);
+}
+
--- a/components/squeezelite/squeezelite.h
+++ b/components/squeezelite/squeezelite.h
@@ -387,6 +387,21 @@ typedef BOOL bool;

 #endif

+typedef u32_t frames_t;
+typedef int sockfd;
+
+// logging
+typedef enum { lERROR = 0, lWARN, lINFO, lDEBUG, lSDEBUG } log_level;
+
+const char *logtime(void);
+void logprint(const char *fmt, ...);
+
+#define LOG_ERROR(fmt, ...) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOG_WARN(fmt, ...)  if (loglevel >= lWARN)  logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOG_INFO(fmt, ...)  if (loglevel >= lINFO)  logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOG_DEBUG(fmt, ...) if (loglevel >= lDEBUG) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOG_SDEBUG(fmt, ...) if (loglevel >= lSDEBUG) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+
 #if EMBEDDED
 #include "embedded.h"
 #endif
@@ -395,9 +410,6 @@ typedef BOOL bool;
 #define MSG_NOSIGNAL 0
 #endif

-typedef u32_t frames_t;
-typedef int sockfd;
-
 #if EVENTFD
 #include <sys/eventfd.h>
 #define event_event int
@@ -473,18 +485,6 @@ void _wake_create(event_event*);

 #define min(a,b) (((a) < (b)) ? (a) : (b))

-// logging
-typedef enum { lERROR = 0, lWARN, lINFO, lDEBUG, lSDEBUG } log_level;
-
-const char *logtime(void);
-void logprint(const char *fmt, ...);
-
-#define LOG_ERROR(fmt, ...) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
-#define LOG_WARN(fmt, ...)  if (loglevel >= lWARN)  logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
-#define LOG_INFO(fmt, ...)  if (loglevel >= lINFO)  logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
-#define LOG_DEBUG(fmt, ...) if (loglevel >= lDEBUG) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
-#define LOG_SDEBUG(fmt, ...) if (loglevel >= lSDEBUG) logprint("%s %s:%d " fmt "\n", logtime(), __FUNCTION__, __LINE__, ##__VA_ARGS__)
-
 // utils.c (non logging)
 typedef enum { EVENT_TIMEOUT = 0, EVENT_READ, EVENT_WAKE } event_type;
 #if WIN && USE_SSL
--- a/components/squeezelite/utils.c
+++ b/components/squeezelite/utils.c
@@ -78,6 +78,7 @@ void logprint(const char *fmt, ...) {
 	va_list args;
 	va_start(args, fmt);
 	vfprintf(stderr, fmt, args);
+	va_end(args);
 	fflush(stderr);
 }

--- a/plugin/SqueezeESP32.zip
+++ b/plugin/SqueezeESP32.zip
--- a/plugin/SqueezeESP32/Graphics.pm
+++ b/plugin/SqueezeESP32/Graphics.pm
@@ -11,6 +11,10 @@ my $prefs = preferences('plugin.squeezeesp32');
 my $log   = logger('plugin.squeezeesp32');

 my $VISUALIZER_NONE = 0;
+my $VISUALIZER_VUMETER = 1;
+my $VISUALIZER_SPECTRUM_ANALYZER = 2;
+my $VISUALIZER_WAVEFORM = 3;
+
 my $width = $prefs->get('width') || 128;

 my @modes = (
@@ -42,6 +46,44 @@ my @modes = (
 	{ desc => ['SETUP_SHOWBUFFERFULLNESS'],
 	  bar => 0, secs => 0,  width => $width, fullness => 1,
 	  params => [$VISUALIZER_NONE] },
+	# mode 7
+	{ desc => ['VISUALIZER_VUMETER_SMALL'],
+	  bar => 0, secs => 0,  width => $width, _width => -20,
+	  # extra parameters (width, height, col (< 0 = from right), row (< 0 = from bottom), bars, left space)
+	  params => [$VISUALIZER_VUMETER, 20, 32, -20, 0, 2] },
+	# mode 8
+	{ desc => ['VISUALIZER_SPECTRUM_ANALYZER_SMALL'],
+	  bar => 0, secs => 0,  width => $width, _width => -32,
+	  # extra parameters (width, height, col (< 0 = from right), row (< 0 = from bottom), bars, left space)
+	  params => [$VISUALIZER_SPECTRUM_ANALYZER, 32, 32, -32, 0, 2, 6] },	  
+	# mode 9	 
+	{ desc => ['VISUALIZER_VUMETER'],
+	  bar => 0, secs => 0,  width => $width,
+	  params => [$VISUALIZER_VUMETER] },
+	# mode 10
+	{ desc => ['VISUALIZER_SPECTRUM_ANALYZER'],
+	  bar => 0, secs => 0,  width => $width,
+	  # extra parameters (bars)
+	  params => [$VISUALIZER_SPECTRUM_ANALYZER, 16] },	  
+	# mode 11	 
+	{ desc => ['VISUALIZER_VUMETER', 'AND', 'ELAPSED'],
+	  bar => 0, secs => 1,  width => $width,
+	  params => [$VISUALIZER_VUMETER] },
+	# mode 12
+	{ desc => ['VISUALIZER_SPECTRUM_ANALYZER', 'AND', 'ELAPSED'],
+	  bar => 0, secs => 1,  width => $width,
+	  # extra parameters (bars)
+	  params => [$VISUALIZER_SPECTRUM_ANALYZER, 16] },	  
+	# mode 13	 
+	{ desc => ['VISUALIZER_VUMETER', 'AND', 'REMAINING'],
+	  bar => 0, secs => -1,  width => $width,
+	  params => [$VISUALIZER_VUMETER] },
+	# mode 14
+	{ desc => ['VISUALIZER_SPECTRUM_ANALYZER', 'AND', 'REMAINING'],
+	  bar => 0, secs => -1,  width => $width,
+	  # extra parameters (bars)
+	  params => [$VISUALIZER_SPECTRUM_ANALYZER, 16] },	  	  
+	  
 );

 sub modes {
@@ -52,6 +94,27 @@ sub nmodes {
 	return $#modes;
 }

+sub displayWidth {
+	my $display = shift;
+	my $client = $display->client;
+
+	# if we're showing the always-on visualizer & the current buttonmode 
+	# hasn't overridden, then use the playing display mode to index
+	# into the display width, otherwise, it's fullscreen.
+	my $mode = 0;
+	
+	if ( $display->showVisualizer() && !defined($client->modeParam('visu')) ) {
+		my $cprefs = preferences('server')->client($client);
+		$mode = $cprefs->get('playingDisplayModes')->[ $cprefs->get('playingDisplayMode') ];
+	}
+	
+	if ($display->widthOverride) {
+		return $display->widthOverride + ($display->modes->[$mode || 0]{_width} || 0);
+	} else {
+		return $display->modes->[$mode || 0]{width};
+	}	
+}
+
 # I don't think LMS renderer handles properly screens other than 32 pixels. It
 # seems that all we get is a 32 pixel-tall data with anything else padded to 0
 # i.e. if we try 64 pixels height, bytes 0..3 and 4..7 will contains the same 
@@ -72,8 +135,12 @@ sub displayHeight {
 	return 32;
 }

-sub displayWidth {
-	return shift->widthOverride(@_) || $width;
+sub updateWidth {
+	my ($display, $width) = @_;
+	
+	foreach my $mode (@{$display->modes}) {
+		$mode->{width} = $width + 1 + $mode->{_width} || 0;
+	}
 }

 sub vfdmodel {
--- a/plugin/SqueezeESP32/install.xml
+++ b/plugin/SqueezeESP32/install.xml
@@ -10,6 +10,6 @@
  <name>PLUGIN_SQUEEZEESP32</name>
  <description>PLUGIN_SQUEEZEESP32_DESC</description>
  <module>Plugins::SqueezeESP32::Plugin</module>
-    <version>0.9</version>
+    <version>0.10</version>
  <creator>Philippe</creator>
 </extensions>
--- a/plugin/repo.xml
+++ b/plugin/repo.xml
@@ -1,10 +1,10 @@
 <?xml version='1.0' standalone='yes'?>
 <extensions>
  <plugins>
-    <plugin version="0.9" name="SqueezeESP32" minTarget="7.5" maxTarget="*">
+    <plugin version="0.10" name="SqueezeESP32" minTarget="7.5" maxTarget="*">
      <link>https://github.com/sle118/squeezelite-esp32</link>
      <creator>Philippe</creator>
-      <sha>89c68b54ad4373df6c0cd37222a07b53013c4815</sha>
+      <sha>5a35a7b821e887baf869535f113b8b55bbc52a54</sha>
      <email>philippe_44@outlook.com</email>
      <desc lang="EN">SqueezeESP32 additional player id (100)</desc>
      <url>http://github.com/sle118/squeezelite-esp32/raw/master/plugin/SqueezeESP32.zip</url>