STM32CUBEIDE的DAC输出，ADC输入并在SPI TFT上显示数据

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zhenwei7799 发布时间：2019-8-25 12:39

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最近为了学习HAL库和熟悉STM32CUBEIDE软件，用手上STM32F407板子做了小工程，里面包含有串口1，串口2的使用，定时器中断，EXTI，DAC输出，ADC的DMA读取和用SPI驱动的TFT彩屏显示。
先放一张工程做好的图吧

程序很简单，用CUBEMX初始化后，只需要自己写回调函数和主函数的部分，先看一下外设的CUBEMX初始化；
(1)USART1和USART2

两个串口的初始化是一样的这是设置的NVIC中断不同，后面放出工程的NVIC配置。
(2)TIM3

定时器的配置要多一点，但只用定时器则比较简单
(3)ADC6

ADC的DMA读取设置

(4)DAC1

(5)SPI2

(6)EXTI

(7)NVIC

(8)GPIO

所有的外设初始化配置完成了;

下面看一下中断相应的回调函数，在HAL库中，写中断处理函数和标准库不同，我个人认为现在只需要在回调函数里写内容就行了，我们看一下HAL库里面的IRQ函数，比如HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)

void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
/* EXTI line interrupt detected */
if(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
{
__HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
HAL_GPIO_EXTI_Callback(GPIO_Pin);
}
}
/**
* @brief EXTI line detection callbacks.
* @param GPIO_Pin Specifies the pins connected EXTI line
* @retval None
*/
__weak void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(GPIO_Pin);
/* NOTE: This function Should not be modified, when the callback is needed,
the HAL_GPIO_EXTI_Callback could be implemented in the user file
*/
}

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HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)里面会调用 HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)函数，而 HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)是需要自己编写。

(1）串口

uint8_t RX_buff[RX_len];
uint8_t RX_temp=0;
uint8_t RX_i=0;
uint8_t RX2_temp=0;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
// uint8_t buff[10];
if(huart->Instance==USART1)
{
//HAL_UART_Transmit(&huart1, &RX_temp, 1, 1);
if(RX_i>=RX_len)
{
RX_i=0;
HAL_UART_Transmit(&huart1, send_buff, sizeof(send_buff), 1);
memset(RX_buff,0,sizeof(RX_buff));
}
else
{
RX_buff[RX_i++]=RX_temp;
if((RX_buff[RX_i-1]=='\n')||(RX_buff[RX_i-2]=='\r'))
{
HAL_UART_Transmit(&huart1, RX_buff, strlen(RX_buff), 10);//Timeout 不能太小，也不能太长
memset(RX_buff,0,sizeof(RX_buff));
RX_i=0;
}
}
HAL_UART_Receive_IT(&huart1, &RX_temp, 1);
}
if(huart->Instance==USART2)
{
HAL_UART_Transmit(&huart2, &RX2_temp, 1, 10);
HAL_UART_Receive_IT(&huart2, &RX2_temp, 1);
}
}

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(2)TIM3定时器中断

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim->Instance=htim3.Instance)
{
HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);
}
}

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(3)EXTI中断

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
HAL_Delay(100);
switch(GPIO_Pin)
{
case WK_UP_Pin:
if(HAL_GPIO_ReadPin(WK_UP_GPIO_Port,WK_UP_Pin) == 1)
{
HAL_GPIO_TogglePin(LED0_GPIO_Port, LED0_Pin);
DAC_Value=3299;
}
break;
case GPIO_PIN_2:
if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_2) == 0)
{
HAL_GPIO_TogglePin(LED0_GPIO_Port, LED0_Pin);
if(DAC_Value<3200) DAC_Value+=100;
}
break;
case GPIO_PIN_3:
if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_3) == 0)
{
HAL_GPIO_TogglePin(LED0_GPIO_Port, LED0_Pin);
if(DAC_Value>=100) DAC_Value-=100;
}
break;
case GPIO_PIN_4:
if(HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_4) == 0)
{
HAL_GPIO_TogglePin(LED0_GPIO_Port, LED0_Pin);
DAC_Value=0;
}
break;
}
}

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再看一下用SPI往LCD里面写数据的程序

uint8_t SPI_WriteByte(uint8_t Byte)
{
HAL_SPI_Transmit(&hspi2, &Byte, sizeof(Byte), 10);
}

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下面看一下主函数

int main(void)
{
/* USER CODE BEGIN 1 */
uint8_t buff[50];
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
MX_TIM3_Init();
MX_ADC1_Init();
MX_DAC_Init();
MX_SPI2_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
LCD_Init();
POINT_COLOR=RED;
LCD_ShowString(10, 50, 16, "Welcome come to My world",0);
//LCD_BL_SET;
memset(RX_buff,0,RX_len);
HAL_UART_Receive_IT(&huart1, &RX_temp, 1);
HAL_UART_Receive_IT(&huart2, &RX2_temp, 1);
HAL_TIM_Base_Start_IT(&htim3);
HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
HAL_ADC_Start_DMA(&hadc1, ADC_val, ADC_length);
//HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, 0x100);
DAC1_Set_Vol(DAC_Value);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_Delay(500);
DAC1_Set_Vol(DAC_Value);
sprintf(buff,"S:ADC: %1.2f DAC:%4d\r\n",Get_ADC(),DAC_Value);
LCD_ShowString(10, 70, 16, buff, 0);
sprintf(buff,"S:DACG:%5d\r\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_1));
LCD_ShowString(10, 90, 16, buff, 0);
HAL_UART_Transmit(&huart1, buff, strlen(buff), 10);
}
/* USER CODE END 3 */
}