BearPi Std 板从入门到放弃 - 引气入体篇（9）(DAC-＞ADC)

简介

结合 BearPi Std 板从入门到放弃 - 引气入体篇（7）(DAC) 和 BearPi Std 板从入门到放弃 - 引气入体篇（8）(ADC) 这两篇， 实现 D -> A -> D 的转换, 也就是DAC -> ADC;
开发板 ： Bearpi Std(小熊派标准板)
主芯片: STM32L431RCT6
LED : PC13 \ 推挽输出即可 \ 高电平点亮
串口: Usart1
KEY1 : PB2 \ 上拉 \ 按下下降沿触发(一次)\ 用于增值
KEY2 : PB3 \ 上拉 \ 按下下降沿触发(一次) \ 用于减值
DAC1: PA5
ADC1: PC2

步骤

1. 创建工程及初始化相关功能;
2. 生成项目BearPi_DAC1_ADC1
3. 添加用户代码

int main()
{
	/* USER CODE BEGIN 1 */
	int16_t adcValue = 0; 
	int16_t dacValue = 0;
	float voltage = 0.0;
  	/* USER CODE END 1 */
	...
	 /* USER CODE BEGIN 2 */
	HAL_DAC_Start(&hdac1, DAC_CHANNEL_2); // 开启DAC通道
	HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&adcValue, 1); // 开启ADC
  /* USER CODE END 2 */

	 /* USER CODE BEGIN WHILE */
  	while (1)
  	{
    	/* USER CODE END WHILE */

   	 	/* USER CODE BEGIN 3 */
		
		if (HAL_GPIO_ReadPin(USER_KEY1_GPIO_Port, USER_KEY1_Pin) == GPIO_PIN_RESET)
		{
			HAL_Delay(100); //  
			if (HAL_GPIO_ReadPin(USER_KEY1_GPIO_Port, USER_KEY1_Pin) == GPIO_PIN_RESET)
			{
				dacValue += 10; 
				if(dacValue > 4095) 
				{
					dacValue = 4095;
				}
				HAL_DAC_SetValue(&hdac1, DAC_CHANNEL_2, DAC_ALIGN_12B_R, dacValue);
				voltage = adcValue*3.3/4095;
				printf(" KEY1+ DACvalue: %d, ADCValue: %d, Voltage:%3.3f\r\n", dacValue, adcValue, voltage);
			}
		}
		if (HAL_GPIO_ReadPin(USER_KEY2_GPIO_Port, USER_KEY2_Pin) == GPIO_PIN_RESET)
		{
			HAL_Delay(100); //  
			if (HAL_GPIO_ReadPin(USER_KEY2_GPIO_Port, USER_KEY2_Pin) == GPIO_PIN_RESET)
			{
				dacValue -= 10; 
				if (dacValue < 0)
				{
					dacValue = 0;
				}	
				HAL_DAC_SetValue(&hdac1, DAC_CHANNEL_2, DAC_ALIGN_12B_R, dacValue);
				voltage = adcValue*3.3/4095;
				printf(" KEY2- DACvalue: %d, ADCValue: %d, Voltage:%3.3f\r\n", dacValue, adcValue, voltage);
			}
		}
		HAL_Delay(100);
  }
  /* USER CODE END 3 */
}

5. 打开串口软件进行监控， 排线连接PC2 和 PA5
6. 按键控制实现设置D值(DAC)与读取D值(ADC)的变化;

BearPi_DAC1_ADC1 完整项目代码