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Enable more ADC1 channels (pins 32-39) (#13742)

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2.0.x
Kajetan Rzepecki 6 years ago committed by Scott Lahteine
parent e1acc09c6e
commit 7c8ee0cd5b
1 changed files with 15 additions and 4 deletions
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19
Marlin/src/HAL/HAL_ESP32/HAL.cpp
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@ -133,12 +133,16 @@ int freeMemory() {
// --------------------------------------------------------------------------
// ADC
// --------------------------------------------------------------------------
#define ADC1_CHANNEL(pin) ADC1_GPIO##pin_CHANNEL
#define ADC1_CHANNEL(pin) ADC1_GPIO ## pin ## _CHANNEL
adc1_channel_t get_channel(int pin) {
switch (pin) {
case 36: return ADC1_GPIO36_CHANNEL;
case 39: return ADC1_GPIO39_CHANNEL;
case 39: return ADC1_CHANNEL(39);
case 36: return ADC1_CHANNEL(36);
case 35: return ADC1_CHANNEL(35);
case 34: return ADC1_CHANNEL(34);
case 33: return ADC1_CHANNEL(33);
case 32: return ADC1_CHANNEL(32);
}
return ADC1_CHANNEL_MAX;
@ -147,8 +151,15 @@ adc1_channel_t get_channel(int pin) {
void HAL_adc_init() {
// Configure ADC
adc1_config_width(ADC_WIDTH_12Bit);
adc1_config_channel_atten(get_channel(36), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(39), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(36), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(35), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(34), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(33), ADC_ATTEN_11db);
adc1_config_channel_atten(get_channel(32), ADC_ATTEN_11db);
// Note that adc2 is shared with the WiFi module, which has higher priority, so the conversion may fail.
// That's why we're not setting it up here.
// Calculate ADC characteristics i.e. gain and offset factors
esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, V_REF, &characteristics);

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