Invalid conversion from 'int' to 'gpio_pulldown_t' ?

shanren · April 29, 2023, 4:46am

Hi all.
The code modified from a main.c try to read analog value by ESP32, got compiling error.
it passed compiling when commented out:

  io_conf.pull_down_en = 0;   
  io_conf.pull_up_en = 0;

but output nothing after uploaded into ESP32 S3.

How to fix this please?
Thanks
Adam

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "esp_system.h"
#include "esp_err.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"

typedef long i32;
static esp_adc_cal_characteristics_t *adc_chars;
static const adc1_channel_t channel = ADC1_CHANNEL_0;  /// DECLEARED BY ADC.h; typedef enum {  ADC1_CHANNEL_0 = 0, /*!< ADC1 channel 0 is GPIO1  */  ;;; //  WAS:  static const adc1_channel_t channel = ADC1_CHANNEL_6;

static const adc_bits_width_t width = ADC_WIDTH_BIT_12;
static const adc_atten_t atten = ADC_ATTEN_DB_11;
static uint8_t adc_configured = 0;
static uint8_t adc_reading = 0;
uint8_t voltage = 0;


void setup()
{
  Serial.begin(115200);
  Serial.println("setup!");
  delay(1000);
  Serial.println("setup!");
  delay(1000);
  Serial.println("setup!");
  delay(1000);
  Serial.println("setup!");
}

void loop()
{
  Serial.println("loop!");
  adc_init();
  for (;;) {
    ESP_LOGI(TAG, "VBat: %ld", adc_read());
    vTaskDelay(1000);
  }
}


void adc_init() {
  /* gpio config */
  esp_err_t err;
  gpio_config_t io_conf = {};

  io_conf.intr_type = GPIO_INTR_DISABLE;
  io_conf.mode = GPIO_MODE_INPUT;
  io_conf.pin_bit_mask =  1ULL << GPIO_NUM_7;
  io_conf.pull_down_en = 0;   
  io_conf.pull_up_en = 0;
  err = gpio_config(&io_conf);

  /* config attenuation */
  adc1_config_channel_atten(channel, atten);

  /* config bit width */
  adc1_config_width(width);
  ///  adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));

  adc_chars = (esp_adc_cal_characteristics_t *)calloc(1, sizeof(esp_adc_cal_characteristics_t));
  esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1,
                                 atten,
                                 width,
                                 1100,
                                 adc_chars);
}

i32 adc_read() {
#define BATADC_SAMPLE_SZ 32
  // multisampling
  for (uint8_t i = 0; i < BATADC_SAMPLE_SZ; i++) {
    i32 raw = adc1_get_raw((adc1_channel_t)channel);
    adc_reading += raw;
    delay(20);  /// was: sys_delay_us(20);
  }

  adc_reading /= (BATADC_SAMPLE_SZ);  /// 'adc_reading' was not declared in this scope  suggested alternative: 'adc_read'

  voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars) * 2u;
  return voltage;
}

ERROR:

Arduino: 1.8.19 (Windows 10), Board: "ESP32S3 Dev Module, Disabled, Disabled, QIO 80MHz, 4MB (32Mb), Core 1, Core 1, Hardware CDC and JTAG, Enabled, Disabled, Disabled, UART0 / Hardware CDC, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi), 921600, None, Disabled"


C:\Users\Xinzhou\Documents\Arduino\ESP32-S3_ADC_reading_issue\ESP32-S3_ADC_reading_issue.ino: In function 'void adc_init()':

ESP32-S3_ADC_reading_issue:72:26: error: invalid conversion from 'int' to 'gpio_pulldown_t' [-fpermissive]

   io_conf.pull_down_en = 0;   /// io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;  /// https://github.com/espressif/esp-idf/issues/285

                          ^

ESP32-S3_ADC_reading_issue:73:24: error: invalid conversion from 'int' to 'gpio_pullup_t' [-fpermissive]

   io_conf.pull_up_en = 0;

                        ^

exit status 1

invalid conversion from 'int' to 'gpio_pulldown_t' [-fpermissive]

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

J-M-L · April 29, 2023, 7:24am

This means there is strong typing for the type gpio_pulldown_t that you need to honor.

You can’t use 0 you need to use one of the enumerators

enum gpio_pull_mode_t

enumerator GPIO_PULLUP_ONLY ➜ Pad pull up
enumerator GPIO_PULLDOWN_ONLY ➜ Pad pull down
enumerator GPIO_PULLUP_PULLDOWN ➜ Pad pull up + pull down
enumerator GPIO_FLOATING ➜ Pad floating

oqibidipo · April 29, 2023, 10:29am

is not gpio_pullup_t or gpio_pulldown_t.

Here ase the correct enums.

typedef enum {
    GPIO_PULLUP_DISABLE = 0x0,     /*!< Disable GPIO pull-up resistor */
    GPIO_PULLUP_ENABLE = 0x1,      /*!< Enable GPIO pull-up resistor */
} gpio_pullup_t;

typedef enum {
    GPIO_PULLDOWN_DISABLE = 0x0,   /*!< Disable GPIO pull-down resistor */
    GPIO_PULLDOWN_ENABLE = 0x1,    /*!< Enable GPIO pull-down resistor  */
} gpio_pulldown_t;

J-M-L · April 29, 2023, 10:44am

oops

indeed thanks - I copied the wrong enum

shanren · April 29, 2023, 2:56pm

Great!
Thank you.

I got compiling ERROR of: cannot convert 'adc1_channel_t' to 'adc_channel_t' in initialization
after added:

static uint16_t adc1_chan_mask = BIT(2) | BIT(3) | BIT(4);
static uint16_t adc2_chan_mask = BIT(0);
static adc_channel_t channel[4] = {ADC1_CHANNEL_2, ADC1_CHANNEL_3, ADC1_CHANNEL_4, (ADC2_CHANNEL_0 | 1 << 3)};

new code and error code below.
Thanks for help.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "esp_system.h"
#include "esp_err.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"

//............................... new added 
static uint16_t adc1_chan_mask = BIT(2) | BIT(3) | BIT(4);
static uint16_t adc2_chan_mask = BIT(0);
static adc_channel_t channel[4] = {ADC1_CHANNEL_2, ADC1_CHANNEL_3, ADC1_CHANNEL_4, (ADC2_CHANNEL_0 | 1 << 3)};
//..............................
 

typedef long i32;
static esp_adc_cal_characteristics_t *adc_chars;
static const adc1_channel_t channel = ADC1_CHANNEL_0;  /// DECLEARED BY ADC.h; typedef enum {  ADC1_CHANNEL_0 = 0, /*!< ADC1 channel 0 is GPIO1  */  ;;; //  WAS:  static const adc1_channel_t channel = ADC1_CHANNEL_6;

static const adc_bits_width_t width = ADC_WIDTH_BIT_12;
static const adc_atten_t atten = ADC_ATTEN_DB_11;
static uint8_t adc_configured = 0;
static uint8_t adc_reading = 0;
uint8_t voltage = 0;


static int adc_raw[2][10];
static const char *TAG = "ADC SINGLE";


void setup()
{
  Serial.begin(115200);
  Serial.println("setup!");
  delay(1000);

  adc_init();

/*  for (;;) {
    ESP_LOGI(TAG, "VBat: %ld", adc_read());
    vTaskDelay(1000);
  }   */
}

void loop()
{
//  Serial.println("loop!");
  /*  adc_init();
    for (;;) {
      ESP_LOGI(TAG, "VBat: %ld", adc_read());
      vTaskDelay(1000);
    }   */

  adc_read();

  Serial.print("voltage=");
  Serial.println(voltage);

}


void adc_init() {
  /* gpio config */
  esp_err_t err;
  gpio_config_t io_conf = {};

  io_conf.intr_type = GPIO_INTR_DISABLE;
  io_conf.mode = GPIO_MODE_INPUT;
  io_conf.pin_bit_mask =  1ULL << GPIO_NUM_7;
  ////  io_conf.pull_down_en = 0;   /// io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;  /// https://github.com/espressif/esp-idf/issues/285
  ////  io_conf.pull_up_en = 0;

  err = gpio_config(&io_conf);

  /* config attenuation */
  adc1_config_channel_atten(channel, atten);

  /* config bit width */
  adc1_config_width(width);
  ///  adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));

  adc_chars = (esp_adc_cal_characteristics_t *)calloc(1, sizeof(esp_adc_cal_characteristics_t));
  esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1,
                                 atten,
                                 width,
                                 1100,
                                 adc_chars);

  //..........................
  ////Here ase the correct enums.

  typedef enum {
    GPIO_PULLUP_DISABLE = 0x0,     /*!< Disable GPIO pull-up resistor */
    GPIO_PULLUP_ENABLE = 0x1,      /*!< Enable GPIO pull-up resistor */
  } gpio_pullup_t;

  typedef enum {
    GPIO_PULLDOWN_DISABLE = 0x0,   /*!< Disable GPIO pull-down resistor */
    GPIO_PULLDOWN_ENABLE = 0x1,    /*!< Enable GPIO pull-down resistor  */
  } gpio_pulldown_t;
  //..........................

}

void adc_read() {
#define BATADC_SAMPLE_SZ 32
  // multisampling
  for (uint8_t i = 0; i < BATADC_SAMPLE_SZ; i++) {
    i32 raw = adc1_get_raw((adc1_channel_t)channel);

 ///   adc_raw = adc1_get_raw((adc1_channel_t)channel);
    adc_reading += raw;
    delay(20);  /// was: sys_delay_us(20);
  }

  adc_reading /= (BATADC_SAMPLE_SZ);  /// 'adc_reading' was not declared in this scope  suggested alternative: 'adc_read'

  voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars) * 2u;
  ///  return voltage;

  Serial.print("voltage =");
  Serial.print("voltage =");
}

system · October 26, 2023, 2:57pm

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Invalid conversion from 'int' to 'gpio_pulldown_t' ?

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