Core2ForAWS_Port_B_ADC_ReadRaw

uint32_t Core2ForAWS_Port_B_ADC_ReadRaw(void);

Read the raw ADC value from GPIO36.

Note

Uses the etched eFuse VRef calibration.

pin_mode_t for PORT_B_ADC_PIN must be set to ADC before using Core2ForAWS_Port_B_ADC_ReadRaw.

This function reads the raw ADC value from Port B's Analog-to-Digital-Converter (ADC) on GPIO36. GPIO36 is the only pin on the external ports with access to the ADC. Read more about using ADCs with the ESP-IDF.

The example code sets the ADC pin mode for the PORT_B_ADC_PIN, creates a FreeRTOS task which periodically (1s) reads the raw ADC value of the M5Stack EARTH moisture sensor connected on Port B. It prints out the value to the serial output.

Example:

 #include <stdio.h>
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "esp_log.h"
 
 #include "core2forAWS.h"
 
 static const char *TAG = "RAW_ADC_READ_DEMO";
 
 void read_moisture_task(){
     for(;;){
         ESP_LOGI(TAG, "Moisture ADC raw: %d", Core2ForAWS_Port_B_ADC_ReadRaw()); *
         vTaskDelay(pdMS_TO_TICKS(1000));
     }
 }
 
 void app_main(void){
     Core2ForAWS_Init();
     esp_err_t err = Core2ForAWS_Port_PinMode(PORT_B_ADC_PIN, ADC);
     if(err == ESP_OK){
         xTaskCreatePinnedToCore(read_moisture_task, "moisture_raw", 4096*2, NULL, 1, NULL, 1);
     }
 }
 
@return The raw ADC reading.