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Merge pull request #102 from wizmo2/battery_atten

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Add Attenuation parameter to battery service
This commit is contained in:
philippe44
2021-05-18 17:22:30 -07:00
committed by GitHub
parent c7b1c7cd83 d3dd8b9078
commit 265403d364
2 changed files with 6 additions and 4 deletions
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4
README.md
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@@ -361,9 +361,9 @@ The benefit of the "raw" mode is that you can build a player which is as close a
There is no good or bad option, it's your choice. Use the NVS parameter "lms_ctrls_raw" to change that option
### Battery / ADC
The NVS parameter "bat_config" sets the ADC1 channel used to measure battery/DC voltage. Scale is a float ratio applied to every sample of the 12 bits ADC. A measure is taken every 10s and an average is made every 5 minutes (not a sliding window). Syntax is
The NVS parameter "bat_config" sets the ADC1 channel used to measure battery/DC voltage. The "atten" value attenuates the input voltage to the ADC input (the read value maintains a 0-1V rage) where: 0=no attenuation(0..800mV), 1=2.5dB attenuation(0..1.1V), 2=6dB attenuation(0..1.35V), 3=11dB attenuation(0..2.6V). Scale is a float ratio applied to every sample of the 12 bits ADC. A measure is taken every 10s and an average is made every 5 minutes (not a sliding window). Syntax is
```
channel=0..7,scale=<scale>,cells=<2|3>
channel=0..7,scale=<scale>,cells=<2|3>,[atten=<0|1|2|3>]
```
NB: Set parameter to empty to disable battery reading. For well-known configuration, this is ignored (except for SqueezeAMP where number of cells is required)
# Configuration

6
components/services/battery.c
View File

@@ -33,11 +33,12 @@ static struct {
int channel;
float sum, avg, scale;
int count;
int cells;
int cells, attenuation;
TimerHandle_t timer;
} battery = {
.channel = CONFIG_BAT_CHANNEL,
.cells = 2,
.attenuation = ADC_ATTEN_DB_0,
};
/****************************************************************************************
@@ -82,6 +83,7 @@ void battery_svc_init(void) {
#ifndef CONFIG_BAT_LOCKED
if ((p = strcasestr(nvs_item, "channel")) != NULL) battery.channel = atoi(strchr(p, '=') + 1);
if ((p = strcasestr(nvs_item, "scale")) != NULL) battery.scale = atof(strchr(p, '=') + 1);
if ((p = strcasestr(nvs_item, "atten")) != NULL) battery.attenuation = atoi(strchr(p, '=') + 1);
#endif
if ((p = strcasestr(nvs_item, "cells")) != NULL) battery.cells = atof(strchr(p, '=') + 1);
free(nvs_item);
@@ -89,7 +91,7 @@ void battery_svc_init(void) {
if (battery.channel != -1) {
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(battery.channel, ADC_ATTEN_DB_0);
adc1_config_channel_atten(battery.channel, battery.attenuation);
battery.avg = adc1_get_raw(battery.channel) * battery.scale / 4095.0;
battery.timer = xTimerCreate("battery", BATTERY_TIMER / portTICK_RATE_MS, pdTRUE, NULL, battery_callback);