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

创建工程及初始化相关功能;
生成项目BearPi_DAC1_ADC1
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 */
}