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Add basic analogWrite support based on LEDC #5861

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Merged
merged 1 commit into from
Nov 9, 2021
Merged

Add basic analogWrite support based on LEDC #5861

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19 changes: 19 additions & 0 deletions cores/esp32/esp32-hal-ledc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "esp32-hal-matrix.h"
#include "soc/soc_caps.h"
#include "soc/ledc_reg.h"
#include "soc/ledc_struct.h"
#include "driver/periph_ctrl.h"
Expand Down Expand Up @@ -331,3 +332,21 @@ double ledcChangeFrequency(uint8_t chan, double freq, uint8_t bit_num)
double res_freq = _ledcSetupTimerFreq(chan, freq, bit_num);
return res_freq;
}

static int8_t pin_to_channel[SOC_GPIO_PIN_COUNT] = { 0 };
static int cnt_channel = SOC_LEDC_CHANNEL_NUM;
void analogWrite(uint8_t pin, int value) {
// Use ledc hardware for internal pins
if (pin < SOC_GPIO_PIN_COUNT) {
if (pin_to_channel[pin] == 0) {
if (!cnt_channel) {
log_e("No more analogWrite channels available! You can have maximum %u", SOC_LEDC_CHANNEL_NUM);
return;
}
pin_to_channel[pin] = cnt_channel--;
ledcAttachPin(pin, cnt_channel);
ledcSetup(cnt_channel, 1000, 8);
}
ledcWrite(pin_to_channel[pin] - 1, value);
}
}
2 changes: 2 additions & 0 deletions cores/esp32/esp32-hal.h
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Expand Up @@ -90,6 +90,8 @@ void yield(void);
#include "esp32-hal-psram.h"
#include "esp32-hal-cpu.h"

void analogWrite(uint8_t pin, int value);

//returns chip temperature in Celsius
float temperatureRead();

Expand Down