From 94e58f8e974a83ea3aa9f4893667b69afc1c5b38 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20L=C3=A1ska?= <konstantin.laska@icloud.com>
Date: Fri, 27 May 2022 15:12:39 +0200
Subject: [PATCH] added ESP32C3 support

---
 ESP32AnalogRead.cpp | 150 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 149 insertions(+), 1 deletion(-)

diff --git a/ESP32AnalogRead.cpp b/ESP32AnalogRead.cpp
index e5192da..a7e89db 100644
--- a/ESP32AnalogRead.cpp
+++ b/ESP32AnalogRead.cpp
@@ -40,7 +40,6 @@ float ESP32AnalogRead::readVoltage()
  ADC1_CHANNEL_7,     !< ADC1 channel 7 is GPIO35
  ADC1_CHANNEL_MAX,
  } adc1_channel_t;
-
  typedef enum {
  ADC2_CHANNEL_0 = 0, !< ADC2 channel 0 is GPIO4
  ADC2_CHANNEL_1,     !< ADC2 channel 1 is GPIO0
@@ -282,6 +281,81 @@ uint32_t ESP32AnalogRead::readMiliVolts()
 	}
 	voltage = esp_adc_cal_raw_to_voltage(raw, &characteristics);
 	return voltage;
+    
+#elif defined(CONFIG_IDF_TARGET_ESP32C3)
+	if (!attached)
+		return 0;
+	analogRead(myPin);
+	// Configure ADC
+	adc_unit_t unit;
+	if (myPin < 5)
+	{
+		adc1_config_width(ADC_WIDTH_12Bit);
+		adc1_channel_t chan = ADC1_CHANNEL_0;
+		unit = ADC_UNIT_1;
+		switch (myPin)
+		{
+
+		case 0:
+			chan = ADC1_CHANNEL_0;
+			break;
+		case 1:
+			chan = ADC1_CHANNEL_1;
+			break;
+		case 2:
+			chan = ADC1_CHANNEL_2;
+			break;
+		case 3:
+			chan = ADC1_CHANNEL_3;
+			break;
+		case 4:
+			chan = ADC1_CHANNEL_4;
+			break;
+		}
+		adc1_channel = chan;
+		adc1_config_channel_atten(chan, ADC_ATTEN_11db);
+	}
+	else
+	{
+		adc2_channel_t chan = ADC2_CHANNEL_0;
+		unit = ADC_UNIT_2;
+		switch (myPin)
+		{
+	case 5:
+			chan = ADC2_CHANNEL_0;
+			break;
+		}
+		adc2_channel = chan;
+		adc2_config_channel_atten(chan, ADC_ATTEN_11db);
+	}
+	// Calculate ADC characteristics i.e. gain and offset factors
+#ifdef ESP_IDF_VERSION
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(3, 1, 0)
+	esp_adc_cal_characterize(unit,
+							 ADC_ATTEN_DB_11,
+							 ADC_WIDTH_BIT_12,
+							 V_REF,
+							 &characteristics);
+#else
+	esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics);
+#endif
+#else
+	esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics);
+#endif
+
+    int raw = 0;
+	uint32_t voltage = 0;
+	// Read ADC and obtain result in mV
+	if (unit == ADC_UNIT_1)
+	{
+		raw = adc1_get_raw(adc1_channel);
+	}
+	else
+	{
+		adc2_get_raw(adc2_channel, ADC_WIDTH_12Bit, &raw);
+	}
+	voltage = esp_adc_cal_raw_to_voltage(raw, &characteristics);
+	return voltage;
 #endif
 }
 
@@ -510,5 +584,79 @@ uint16_t ESP32AnalogRead::readRaw()
 		adc2_get_raw(adc2_channel, ADC_WIDTH_12Bit, &raw);
 	}
 	return raw;
+    
+#elif defined(CONFIG_IDF_TARGET_ESP32C3)
+	if (!attached)
+		return 0;
+	analogRead(myPin);
+	// Configure ADC
+	adc_unit_t unit;
+	if (myPin < 5)
+	{
+		adc1_config_width(ADC_WIDTH_12Bit);
+		adc1_channel_t chan = ADC1_CHANNEL_0;
+		unit = ADC_UNIT_1;
+		switch (myPin)
+		{
+
+		case 0:
+			chan = ADC1_CHANNEL_0;
+			break;
+		case 1:
+			chan = ADC1_CHANNEL_1;
+			break;
+		case 2:
+			chan = ADC1_CHANNEL_2;
+			break;
+		case 3:
+			chan = ADC1_CHANNEL_3;
+			break;
+		case 4:
+			chan = ADC1_CHANNEL_4;
+			break;
+		}
+		adc1_channel = chan;
+		adc1_config_channel_atten(chan, ADC_ATTEN_11db);
+	}
+	else
+	{
+		adc2_channel_t chan = ADC2_CHANNEL_0;
+		unit = ADC_UNIT_2;
+		switch (myPin)
+		{
+	case 5:
+			chan = ADC2_CHANNEL_0;
+			break;
+		}
+		adc2_channel = chan;
+		adc2_config_channel_atten(chan, ADC_ATTEN_11db);
+	}
+	// Calculate ADC characteristics i.e. gain and offset factors
+#ifdef ESP_IDF_VERSION
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(3, 1, 0)
+	esp_adc_cal_characterize(unit,
+							 ADC_ATTEN_DB_11,
+							 ADC_WIDTH_BIT_12,
+							 V_REF,
+							 &characteristics);
+#else
+	esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics);
+#endif
+#else
+	esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics);
+#endif
+
+	int raw = 0;
+	uint32_t voltage = 0;
+	// Read ADC and obtain result in mV
+	if (unit == ADC_UNIT_1)
+	{
+		raw = adc1_get_raw(adc1_channel);
+	}
+	else
+	{
+		adc2_get_raw(adc2_channel, ADC_WIDTH_12Bit, &raw);
+	}
+	return raw;
 #endif
 }
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