《RT-Thread设备驱动开发指南》之ADC

南若

《RT-Thread设备驱动开发指南》之ADC [复制链接]

 

本文基于STM32F103以及RT-Thread Studio来大概表描述一下RT-Thread的ADC。

一、配置ADC:

/*-------------------------- ADC CONFIG BEGIN --------------------------*/

/** if you want to use adc you can use the following instructions.
 *
 * STEP 1, open adc driver framework support in the RT-Thread Settings file
 *
 * STEP 2, define macro related to the adc
 *                 such as     #define BSP_USING_ADC1
 *
 * STEP 3, copy your adc init function from stm32xxxx_hal_msp.c generated by stm32cubemx to the end of board.c file
 *                 such as     void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
 *
 * STEP 4, modify your stm32xxxx_hal_config.h file to support adc peripherals. define macro related to the peripherals
 *                 such as     #define HAL_ADC_MODULE_ENABLED
 *
 */

/*#define BSP_USING_ADC1*/
/*#define BSP_USING_ADC2*/
/*#define BSP_USING_ADC3*/

/*-------------------------- ADC CONFIG END --------------------------*/

1、打开ADC设备驱动框架的支持

 

2、定义ADC相关的宏，使用ADC1

#define BSP_USING_ADC1

3、拷贝ADC初始化函数到board.c结尾，初始化ADC1-5

void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hadc->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */

  /* USER CODE END ADC1_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_ADC1_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PA5     ------> ADC1_IN5
    */
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN ADC1_MspInit 1 */

  /* USER CODE END ADC1_MspInit 1 */
  }
}

4、开启ADC使能

#define HAL_ADC_MODULE_ENABLED

二、使用ADC

1、查找ADC设备

adc_dev=(rt_adc_device_t)rt_device_find("ad1");

2、使能ADC设备

ret=rt_adc_enable(adc_dev, 5);

3、读采样值并打印

value=rt_adc_read(adc_dev, 5);
rt_kprintf("the value is:d% \n",value);

4、关闭ADC

ret=rt_adc_disable(adc_dev, 5);

三、终端打印值4095，即3.3V

the value is:4095