基于小凌派RK2206开发板：OpenHarmony如何使用IoT接口控制ADC外设 原创

base/iot_hardware/peripheral/interfaces/kits/iot_adc.h
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unsigned int IoTAdcInit(unsigned int id);
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unsigned int IoTAdcInit(unsigned int id) {

  unsigned int ret = 0;
  uint32_t *pGrfSocCon29 = (uint32_t *)(0x41050000U + 0x274U);
  uint32_t ulValue;

  if (id < 0 || id > 7) {
    PRINT_ERR("id(%d) > 7 or id(%d) < 0\n", id, id);
    return IOT_FAILURE;
  }

  m_adcKey.ctrl1.gpio = GPIO0_PC0 + id;

  ret = DevIoInit(m_adcKey);
  if (ret != LZ_HARDWARE_SUCCESS) {
    PRINT_ERR("%s, %s, %d: ADC Key IO Init fail\n", __FILE__, __func__,
              __LINE__);
    return IOT_FAILURE;
  }

  /* LzSaradcInit 接口只要初始化一次 */
  if(!init_adc_cnt) { 
    ret = LzSaradcInit();
    if (ret != LZ_HARDWARE_SUCCESS) {
      PRINT_ERR("%s, %s, %d: ADC Init fail\n", __FILE__, __func__, __LINE__);
      return IOT_FAILURE;
    }
  }

  /* 记录调用该接口次数 */
  init_adc_cnt++;

  /* 设置saradc的电压信号，选择AVDD */
  ulValue = *pGrfSocCon29;
  ulValue &= ~(0x1 << 4);
  ulValue |= ((0x1 << 4) << 16);
  *pGrfSocCon29 = ulValue;

  return IOT_SUCCESS;
}
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unsigned int IoTAdcDeinit(unsigned int id);
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unsigned int IoTAdcDeinit(unsigned int id) {

  unsigned int ret = 0;

  if (id < 0 || id > 7) {
    PRINT_ERR("id(%d) > 7 or id(%d) < 0\n", id, id);
    return IOT_FAILURE;
  }

  m_adcKey.ctrl1.gpio = GPIO0_PC0 + id;

  LzGpioDeinit(m_adcKey.ctrl1.gpio);
  init_adc_cnt--;

  /* 当 init_adc_cnt 为 0 调用 LzSaradcDeinit 注销  */
  if(!init_adc_cnt) {
    ret = LzSaradcDeinit();
    if (ret != LZ_HARDWARE_SUCCESS) {
      PRINT_ERR("%s, %s, %d: ADC Deinit Fail\n", __FILE__, __func__, __LINE__);
      return IOT_FAILURE;
    }
  }

  return IOT_SUCCESS;
}
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unsigned int IoTAdcGetVal(unsigned int id, unsigned int *val);
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unsigned int IoTAdcGetVal(unsigned int id, unsigned int *val) {

  unsigned int ret = 0;

  if (id < 0 || id > 7) {
    PRINT_ERR("id(%d) > 7 or id(%d) < 0\n", id, id);
    return IOT_FAILURE;
  }

  ret = LzSaradcReadValue(id, val);

  if (ret != LZ_HARDWARE_SUCCESS) {
    PRINT_ERR("%s, %s, %d: ADC Read Fail\n", __FILE__, __func__, __LINE__);
    return IOT_FAILURE;
  }

  return IOT_SUCCESS;
}
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void adc_example()
{
    unsigned int thread_id;
    TSK_INIT_PARAM_S task = {0};
    unsigned int ret      = LOS_OK;

    task.pfnTaskEntry = (TSK_ENTRY_FUNC)adc_thread;
    task.uwStackSize  = 2048;
    task.pcName       = "adc_thread";
    task.usTaskPrio   = 24;
    ret               = LOS_TaskCreate(&thread_id, &task);
    if (ret != LOS_OK) {
        printf("Falied to create adc_thread ret:0x%x\n", ret);
        return;
    }
}
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void adc_thread()
{
    unsigned int data = 0;
    float voltage     = 0;
    unsigned int ret  = 0;

    /* 初始化adc设备 */
    ret = IoTAdcInit(ADC_CHANNEL);
    if (ret == IOT_FAILURE) {
        printf("%s, %s, %d: ADC Key IO Init fail\n", __FILE__, __func__, __LINE__);
    }

    while (1) {
        printf("***************Adc Example*************\r\n");
        /*获取电压值*/
        ret = IoTAdcGetVal(ADC_CHANNEL, &data);
        if (ret == IOT_FAILURE) {
            printf("%s, %s, %d: ADC Read Fail\n", __FILE__, __func__, __LINE__);
            return 0.0;
        }
        voltage = (float)(data * 3.3 / 1024.0);
        printf("vlt:%.3fV\n", voltage);

        /* 睡眠1秒 */
        LOS_Msleep(1000);
    }
}
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实际电压 = (ADC采集数值 / 1024) * 3.3V
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return (float)(data * 3.3 / 1024.0)
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"./b17_iot_adc:iot_adc_example",
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hardware_LIBS = -lhal_iothardware -lhardware -lshellcmd -liot_adc_example
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***************Adc Example*************
vlt:3.297V
***************Adc Example*************
vlt:3.297V
***************Adc Example*************
vlt:3.297V
***************Adc Example*************
vlt:3.297V
***************Adc Example*************
vlt:3.297V
***************Adc Example*************
vlt:3.297V
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