Ring buffer implementation

First stab at implementing a ring buffer. Now tuning should be done.
The statistics report causes jitters and can be deactivated by lowering
the output verbosity.

main/perf_trace.h

@@ -0,0 +1,44 @@
+
+#pragma once
+#define FRAMES_TO_MS(f) output.current_sample_rate>0?1000*f/output.current_sample_rate:LONG_MIN
+#define BYTES_TO_MS(b) FRAMES_TO_MS(BYTES_TO_FRAME(b))
+#define LINE_MIN_MAX_FORMAT          "%14s%10d|%10d|%11d|"                 "  |%10d|%10d|%16d|"
+#define LINE_MIN_MAX_DURATION_FORMAT "%14s%10d|%10d|%11d|"
+#define LINE_MIN_MAX_FORMAT_STREAM   "%14s%10s|%10s|%11s|"                 "  |%10d|%10d|%16d|"
+#define SET_MIN_MAX(val,var) var=val; if(var<min_##var) min_##var=var; if(var>max_##var) max_##var=var
+#define RESET_MIN_MAX(var,mv) min_##var=mv##_MAX; max_##var=mv##_MIN
+#define DECLARE_MIN_MAX(var,t,mv) static t min_##var = mv##_MAX, max_##var = mv##_MIN; t var=0
+#define LINE_MIN_MAX(name,var) name,BYTES_TO_MS(max_##var), BYTES_TO_MS(min_##var),BYTES_TO_MS( var),max_##var,min_##var,var
+#define LINE_MIN_MAX_STREAM(name,var) name,"n/a","n/a","n/a",max_##var,min_##var,var
+#define LINE_MIN_MAX_DURATION(name,var) name,max_##var, min_##var, var
+
+#define TIME_MEASUREMENT_START(x) x=esp_timer_get_time()
+#define TIME_MEASUREMENT_GET(x) (esp_timer_get_time()-x)/1000
+
+#define TIMED_SECTION_START_MS_FORCE(x,force) if(hasTimeElapsed(x,force)) {
+#define TIMED_SECTION_START_MS(x) 		if(hasTimeElapsed(x,false)){
+#define TIMED_SECTION_START_FORCE(x,force) 			TIMED_SECTION_START_MS(x * 1000UL,force)
+#define TIMED_SECTION_START(x) 			TIMED_SECTION_START_MS(x * 1000UL)
+#define TIMED_SECTION_END				}
+static inline bool hasTimeElapsed(time_t delayMS, bool bforce)
+{
+	static time_t lastTime=0;
+	if (lastTime <= gettime_ms() ||bforce)
+	{
+		lastTime = gettime_ms() + delayMS;
+		return true;
+	}
+	else
+		return false;
+}
+//#define MAX_PERF_NAME_LEN 10
+//#define MAX_PERF_FORMAT_LEN 12
+//typedef enum  {BUFFER_TYPE,DURATION_TYPE,LAST } perf_formats;
+//typedef struct _perf_stats {
+//	uint32_t min;
+//	uint32_t max;
+//	uint32_t current;
+//	char name[MAX_PERF_NAME_LEN+1];
+//	uint32_t timer_start;
+//	perf_formats fmt;
+//} perf_stats;