board/main/temperature.c

#include <stdio.h>
#include <stdlib.h>

#include "driver/i2c.h"
#include "embedded_display.c"
#include "esp_log.h"
#include "i2c.c"

#define ACK_CHECK_EN 0x1  /*!< I2C master will check ack from slave*/
#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
#define ACK_VAL 0x0       /*!< I2C ack value */
#define NACK_VAL 0x1      /*!< I2C nack value */

#define GX21M15_TEMP_POINTER_VALUE 0b00   // 温度寄存器
#define GX21M15_CONF_POINTER_VALUE 0b01   // 配置寄存器
#define GX21M15_THYST_POINTER_VALUE 0b10  // 回滞寄存器
#define GX21M15_TOS_POINTER_VALUE 0b11    // 过温关断寄存器

#define DEFAULT_TEMPERATURE -999  // 过温关断寄存器
#define TEMPERATURE_TAG "temperature"

void fetch_temperature(void* arg) {
  esp_err_t error;
  float temperature = DEFAULT_TEMPERATURE;
  char temperature_str[20];
  uint8_t temperature_buffer[] = {0, 0};
  display_fill_rect(0, 0, 128, 2, 0x00);
  for (;;) {
    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
    i2c_master_start(cmd);
    i2c_master_write_byte(cmd, GX21M15_ADDRESS << 1 | I2C_MASTER_WRITE,
                          ACK_CHECK_EN);
    i2c_master_write_byte(cmd, 0, ACK_CHECK_EN);
    i2c_master_start(cmd);
    i2c_master_write_byte(cmd, GX21M15_ADDRESS << 1 | I2C_MASTER_READ, ACK_VAL);
    i2c_master_read_byte(cmd, &(temperature_buffer[0]), ACK_VAL);
    i2c_master_read_byte(cmd, &(temperature_buffer[1]), NACK_VAL);
    i2c_master_stop(cmd);
    error =
        i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);
    i2c_cmd_link_delete(cmd);
    if (error != ESP_OK) {
      ESP_LOGW(TEMPERATURE_TAG, "read failed. %x", error);
    } else {
      if (temperature_buffer[0] == 0xff) {
        if (temperature == DEFAULT_TEMPERATURE) {
          sprintf(temperature_str, "Temp: Loading");
        } else {
          sprintf(temperature_str, "Temp: %.3f.", temperature);
        }
      } else {
        if (temperature_buffer[0] >> 7) {
          temperature = -(((((~temperature_buffer[0]) & 0x7f) << 3) |
                           ((~temperature_buffer[1] >> 5) & 0x07)) +
                          1) *
                        0.125;
        } else {
          temperature =
              (temperature_buffer[0] << 3 | temperature_buffer[1] >> 5) * 0.125;
        }
        sprintf(temperature_str, "Temp: %2.3f", temperature);
      }
      display_print8_str(8, 0, temperature_str);
    }
    vTaskDelay(pdMS_TO_TICKS(2000));
  }
  display_fill_rect(0, 0, 128, 2, 0x00);
}

void auto_fetch_temperature() {
  if (is_temperature_online == 0) {
    ESP_LOGW(TEMPERATURE_TAG, "temperature is offline");
    return;
  }
  ESP_LOGI(TEMPERATURE_TAG, "auto_fetch_temperature");
  xTaskCreate(fetch_temperature, "temperature", 2048, NULL, 10, NULL);
}