From 973fcf00fb3ccf0b4c1f4eae8b32f432b2d28ef7 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Mon, 8 Nov 2021 15:56:34 +0200
Subject: [PATCH] Add basic analogWrite support
---
cores/esp32/esp32-hal-ledc.c | 19 +++++++++++++++++++
cores/esp32/esp32-hal.h | 2 ++
2 files changed, 21 insertions(+)
diff --git a/cores/esp32/esp32-hal-ledc.c b/cores/esp32/esp32-hal-ledc.c
index 102e5bbb0e2..4e20e7b8bd4 100644
--- a/cores/esp32/esp32-hal-ledc.c
+++ b/cores/esp32/esp32-hal-ledc.c
@@ -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"
@@ -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);
+ }
+}
diff --git a/cores/esp32/esp32-hal.h b/cores/esp32/esp32-hal.h
index 3efead522dd..115a050b172 100644
--- a/cores/esp32/esp32-hal.h
+++ b/cores/esp32/esp32-hal.h
@@ -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();