【RoboMaster】一次搞定最难理解的DMA机制!【STM32】

同步博客地址:从STM32开始的RoboMaster生活:进阶篇 IV [DMA]

项目&教程仓库:-STM32-RoboMaster-


1.0 什么是DMA

1.1 DMA的定义

Direct Memory Access:直接存储器访问 是所有现代计算设备的重要特色,它允许不同速度的硬件装置来沟通,而不需要依赖于CPU的大量中断负载。否则,CPU需要从来源把每一片段的资料复制到暂存器,然后把它们再次写回到新的地方。在这个时间中,CPU对于其他的工作来说就无法使用。DMA传输将数据从一个地址空间复制到另外一个地址空间。当CPU初始化这个传输动作,传输动作本身是由DMA控制器来实行和完成。典型的例子就是移动一个外部内存的区块到芯片内部更快的内存区。像是这样的操作并没有让处理器工作拖延,反而可以被重新排程去处理其他的工作。DMA传输是高效能嵌入式系统算法和网络最关键的部分。

【RoboMaster】一次搞定最难理解的DMA机制!【STM32】_第1张图片

从上图可以看出,DMA和CPU是同等地位的,CPU能进行的数据转移操作,DMA都能做,或者说,DMA就是只能做数据转移操作的迷你CPU。

如果要简单理解的话,DMA就是CPU小弟,当CPU觉得把一大串数据转移到另一个地方这种任务太麻烦,还有更重要的事情需要做的时候,就可以把这个任务丢给DMA去干,DMA干完或者出问题了跟CPU说一声就行了。

1.2 DMA的内部结构

【RoboMaster】一次搞定最难理解的DMA机制!【STM32】_第2张图片

  • STM32 --> DMA --> Stream --> Channel
    • STM32F4家族拥有两个DMA,其中只有DMA2能够进行M2M操作(稍后会讲)。
    • 每个DMA一般拥有8个Stream。
    • 每个Stream有多个Channel选项,但是一次只能进行一个Channel的传输,具体的配置与选项请参考芯片对应的数据手册。

【RoboMaster】一次搞定最难理解的DMA机制!【STM32】_第3张图片

2.0 什么情况下使用DMA?

2.1 UART

  • 这是最常见的使用情况,当有大量的数据从UART读入或者写入的时候,DMA将CPU解放出来,然后自己单干,让CPU处理更重要的事情。

2.2 ADC

  • 一般在需要ADC时的通道扫描模式下,需要DMA来处理,本章不讲解这部分,放到后面专门讲ADC的篇章。

2.3 SD

  • 需要大量往SD里面读写数据的时候一般也用DMA来处理,本章不讲解这部分。

3.0 DMA的使用方法

3.1 传输方向

  • P2P
    • Peripheral to Peripheral:从外设到外设 在RM中暂时用不上,不讲解
  • P2M
    • Peripheral to Memory:从外设到内存 当传感器从UART传来数据的时候用
  • M2P
    • Memory to Peripheral:从内存到外设 从UART传出数据控制执行器的时候用
  • M2M
    • Memory to Memory:从内存到内存 MCU内部的数据转移,常见于Buffer之间互相转移数据,或者从Buffer读写数据
    • 只有DMA2能够执行M2M操作。

3.2 特殊选项

  • First In First Out是STM32里面的DMA的特殊功能,但是一般来说,RM就算不用FIFO,DMA也能完美处理数据,所以暂时不需要,也同样不讲解。

3.3 传输模式

3.3.1 Normal Mode

  • 常用的默认模式,在该模式下,任务完成后就停止DMA,如果还需要用到DMA,需要再次手动启动。

3.3.2 Circular Mode / Continuous Mode

  • 可选模式,在该模式下,任务完成后,DMA的Buffer清零,再次执行任务。也就是说,永远重复执行下去,除非手动停止。

3.4 传输方式

3.4.1 DMA泛用方法(需要用到寄存器)

3.4.1.1 Polling

需要注意的是,DMA的Polling其实根本毫无意义,因为在这个过程中,CPU还是全程参与了,并没有解放CPU,所以,虽然这种方法我还是列出来了,但是除了Debug时可能会用到,其他情况下建议不要用。

HAL_StatusTypeDef HAL_DMA_Start(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t	DstAddress, uint32_t DataLength);
  • 参数
    • hdma:指向DMA Stream配置结构体
    • SrcAddress:需要传输的数据的地址
    • DstAddress:数据传输到的目标地址
    • DataLength:传输的数据大小
  • 返回值
    • HAL_StatusTypeDef:如果传输配置成功,返回HAL_OK;如果该DMA Stream正在被占用,返回HAL_BUSY

huart.Instance->CR3|=USART_CR3_DMAT;
  • 通过修改CR3寄存器对应的bit,开启DMA传输

HAL_StatusTypeDef HAL_DMA_PollForTransfer(DMA_HandleTypeDef *hdma, HAL_DMA_LevelCompleteTypeDef CompleteLevel, uint32_t Timeout);
  • 参数
    • hdma:指向DMA Stream配置结构体
    • CompleteLevel:指定DMA的完成程度
    • Timeout:传输的最大时限
  • 返回值
    • HAL_StatusTypeDef:如果传输成功,返回HAL_OK;如果传输出错,返回HAL_ERROR;如果传输超过最大时限,返回HAL_TIMEOUT

huart.Instance->CR3&=~USART_CR3_DMAT;
  • 通过修改CR3寄存器对应的bit,结束DMA传输
3.4.1.2 Interrupt
HAL_StatusTypeDef HAL_DMA_Start_IT(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t	DstAddress, uint32_t DataLength);
  • 参数
    • hdma:指向DMA Stream配置结构体
    • SrcAddress:需要传输的数据的地址
    • DstAddress:数据传输到的目标地址
    • DataLength:传输的数据大小
  • 返回值
    • HAL_StatusTypeDef:如果传输配置成功,返回HAL_OK;如果该DMA Stream正在被占用,则返回HAL_BUSY

huart.Instance->CR3|=USART_CR3_DMAT;
  • 通过修改CR3寄存器对应的bit,开启DMA传输

void XferCpltCallback(DMA_HandleTypeDef *hdma){
    ......
}
  • 在写代码的时候,在main.c中创建XferCpltCallback函数
  • 在该函数中填写DMA传输结束后,需要执行的代码

huart.Instance->CR3&=~USART_CR3_DMAT;
  • 通过修改CR3寄存器对应的bit,结束DMA传输

3.4.2 UART特化方法(全HAL库实现)

HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
  • 参数
    • huart:指向UART引脚配置结构体
    • pData:指向需要传输的数据
    • Size:传输数据的大小
  • 返回值
    • HAL_StatusTypeDef:如果传输配置成功,返回HAL_OK;如果传输出错,返回HAL_ERROR;如果该DMA Stream正在被占用,则返回HAL_BUSY

HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
  • 参数
    • huart:指向UART引脚配置结构体
    • pData:指向需要传输的数据
    • Size:传输数据的大小
  • 返回值
    • HAL_StatusTypeDef:如果传输配置成功,返回HAL_OK;如果传输出错,返回HAL_ERROR;如果该DMA Stream正在被占用,则返回HAL_BUSY

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart){
	......
}
  • 在写代码的时候,在main.c中创建HAL_UART_TxCpltCallback函数
  • 在该函数中填写UART发送结束后,需要执行的代码

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){
	......
}
  • 在写代码的时候,在main.c中创建HAL_UART_RxCpltCallback函数
  • 在该函数中填写UART接收结束后,需要执行的代码

4.0 练习项目

4.1 项目简介

  • 一键发送信息:按下用户自定义按钮,就从UART发送出预先设定好的信息,完成后在板子上亮红灯0.2s。
  • 键盘回响:按下键盘,从STM32返回对应的字符,完成后在板子上亮绿灯0.2s。然后,再加上上面一键发送信息的功能。

4.2 项目代码

完整的工程文件可以在这里找到!

4.2.1 一键发送信息

  • DMA泛用方法 Polling
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * 

© Copyright (c) 2020 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */
/* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "string.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart7; DMA_HandleTypeDef hdma_uart7_tx; /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_UART7_Init(void); /* USER CODE BEGIN PFP */ /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ char msg[]="\r\n" " %@@@@@@@#\r\n" " .(&@&, &@@@@@@@% *@@&(\r\n" " %@@@@@@@@%%&@@@@@@@@@@@@@@@@@@@&%&@@@@@@@@#\r\n" " &@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/\r\n" " ,. .&@@@@@@@@@@@@@&(. ,(&@@@@@@@@@@@@@&. .,\r\n" " &@@@@&@@@@@@@@@@@&, ###%#%%%%#%%%#### *&@@@@@@@@@@@&@@@@%\r\n" " /@@@@@@@@@@@@@@@& ,@@@@@@@@&. .&@@@@@@@@@@@@@@@,\r\n" " (&@@@@@@@@@@@@@# (@@@@@@@/ %@@@@@@@@@@@@@&*\r\n" " &@@@@@@@@&. ,%@@@@&@@@@@@@&@@@&%, ,&@@@@@@@@%\r\n" " /@@@@@@@@% #@@@@@( *@@@@@@&, %@@@@&( &@@@@@@@@/\r\n" " .&@@@@@@@% #@@@@@% *@@@@@@&, &@@@@@# &@@@@@@@&. # \"There is no truth in flesh, only betrayal.\"\r\n" " ,%%%%&@@@@@@@@* &@@@@@% *@@@@@@&, %@@@@@% ,@@@@@@@@&%%%% # \"There is no strength in flesh, only weakness.\"\r\n" " /@@@@@@@@@@@@&. #@@@@@@, *@@@@@@&, ,@@@@@@( .&@@@@@@@@@@@&, # \"There is no constancy in flesh, only decay .\"\r\n" " /@@@@@@@@@@@@& %@@@@@@, *@@@@@@&, ,@@@@@@# .&@@@@@@@@@@@&, # \"There is no certainty in flesh, but death .\"\r\n" " *&@@@@@@@@@@@&, .@@@@@@# *@@@@@@&, %@@@@@& ,@@@@@@@@@@@@&. # — Credo Omnissiah\r\n" " .&@@@@@@@# .&@@@@@( *@@@@@@&, %@@@@@& %@@@@@@@&.\r\n" " (@@@@@@@@( ,&@@@@&. *@@@@@@&, *&@@@@%. #@@@@@@@@( Welcome back to Adeptus Mechanicus, Alchemic Ronin!\r\n" " %@@@@@@@@% .%@@@@&%@@@@@@@%&@@@@#. %@@@@@@@@%\r\n" " .(&@@@@@@@@@@@@, *%@@@@@@@%* (@@@@@@@@@@@@&/\r\n" " %@@@@@@@@@@@@@@@/ .(@@@@@@@@@(. #@@@@@@@@@@@@@@@#\r\n" " .&@@@@@@@@@@@@@@@@( ,***************, #&@@@@@@@@@@@@@@@&.\r\n" " %( #@@@@@@@@@@@@@%*. ./&@@@@@@@@@@@@@/ .##\r\n" " .&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%.\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@(\r\n" " &@@@@@@@@@&@@@@@@@@@@@@@@@@@@@@@&@@@@@@@@@%\r\n" " /&@@@/ .*&@@@@@@@&,. (@@@&/\r\n" " %@@@@@@@#\r\n" " .,,,,,,,.\r\n" "\r\n"; /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* 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_UART7_Init(); /* USER CODE BEGIN 2 */ HAL_GPIO_WritePin(LD_RED_GPIO_Port,LD_RED_Pin,GPIO_PIN_SET); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /** Initializes the CPU, AHB and APB busses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB busses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } } /** * @brief UART7 Initialization Function * @param None * @retval None */ static void MX_UART7_Init(void) { /* USER CODE BEGIN UART7_Init 0 */ /* USER CODE END UART7_Init 0 */ /* USER CODE BEGIN UART7_Init 1 */ /* USER CODE END UART7_Init 1 */ huart7.Instance = UART7; huart7.Init.BaudRate = 115200; huart7.Init.WordLength = UART_WORDLENGTH_8B; huart7.Init.StopBits = UART_STOPBITS_1; huart7.Init.Parity = UART_PARITY_NONE; huart7.Init.Mode = UART_MODE_TX_RX; huart7.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart7.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart7) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN UART7_Init 2 */ /* USER CODE END UART7_Init 2 */ } /** * Enable DMA controller clock */ static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE(); /* DMA interrupt init */ /* DMA1_Stream1_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 1, 0); HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn); } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LD_RED_GPIO_Port, LD_RED_Pin, GPIO_PIN_RESET); /*Configure GPIO pin : Button_Pin */ GPIO_InitStruct.Pin = Button_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(Button_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pin : LD_RED_Pin */ GPIO_InitStruct.Pin = LD_RED_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LD_RED_GPIO_Port, &GPIO_InitStruct); /* EXTI interrupt init*/ HAL_NVIC_SetPriority(EXTI2_IRQn, 1, 0); HAL_NVIC_EnableIRQ(EXTI2_IRQn); } /* USER CODE BEGIN 4 */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){ if(GPIO_Pin == Button_Pin){ HAL_Delay(500); HAL_DMA_Start(&hdma_uart7_tx,(uint32_t)msg,(uint32_t)&huart7.Instance->DR,strlen(msg)); huart7.Instance->CR3|=USART_CR3_DMAT; HAL_DMA_PollForTransfer(&hdma_uart7_tx,HAL_DMA_FULL_TRANSFER,HAL_MAX_DELAY); huart7.Instance->CR3&=~USART_CR3_DMAT; HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); HAL_Delay(200); HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); } } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  • DMA泛用方法 Interrupt
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * 

© Copyright (c) 2020 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */
/* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "string.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart7; DMA_HandleTypeDef hdma_uart7_tx; /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_UART7_Init(void); /* USER CODE BEGIN PFP */ /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ char msg[]="\r\n" " %@@@@@@@#\r\n" " .(&@&, &@@@@@@@% *@@&(\r\n" " %@@@@@@@@%%&@@@@@@@@@@@@@@@@@@@&%&@@@@@@@@#\r\n" " &@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/\r\n" " ,. .&@@@@@@@@@@@@@&(. ,(&@@@@@@@@@@@@@&. .,\r\n" " &@@@@&@@@@@@@@@@@&, ###%#%%%%#%%%#### *&@@@@@@@@@@@&@@@@%\r\n" " /@@@@@@@@@@@@@@@& ,@@@@@@@@&. .&@@@@@@@@@@@@@@@,\r\n" " (&@@@@@@@@@@@@@# (@@@@@@@/ %@@@@@@@@@@@@@&*\r\n" " &@@@@@@@@&. ,%@@@@&@@@@@@@&@@@&%, ,&@@@@@@@@%\r\n" " /@@@@@@@@% #@@@@@( *@@@@@@&, %@@@@&( &@@@@@@@@/\r\n" " .&@@@@@@@% #@@@@@% *@@@@@@&, &@@@@@# &@@@@@@@&. # \"There is no truth in flesh, only betrayal.\"\r\n" " ,%%%%&@@@@@@@@* &@@@@@% *@@@@@@&, %@@@@@% ,@@@@@@@@&%%%% # \"There is no strength in flesh, only weakness.\"\r\n" " /@@@@@@@@@@@@&. #@@@@@@, *@@@@@@&, ,@@@@@@( .&@@@@@@@@@@@&, # \"There is no constancy in flesh, only decay .\"\r\n" " /@@@@@@@@@@@@& %@@@@@@, *@@@@@@&, ,@@@@@@# .&@@@@@@@@@@@&, # \"There is no certainty in flesh, but death .\"\r\n" " *&@@@@@@@@@@@&, .@@@@@@# *@@@@@@&, %@@@@@& ,@@@@@@@@@@@@&. # — Credo Omnissiah\r\n" " .&@@@@@@@# .&@@@@@( *@@@@@@&, %@@@@@& %@@@@@@@&.\r\n" " (@@@@@@@@( ,&@@@@&. *@@@@@@&, *&@@@@%. #@@@@@@@@( Welcome back to Adeptus Mechanicus, Alchemic Ronin!\r\n" " %@@@@@@@@% .%@@@@&%@@@@@@@%&@@@@#. %@@@@@@@@%\r\n" " .(&@@@@@@@@@@@@, *%@@@@@@@%* (@@@@@@@@@@@@&/\r\n" " %@@@@@@@@@@@@@@@/ .(@@@@@@@@@(. #@@@@@@@@@@@@@@@#\r\n" " .&@@@@@@@@@@@@@@@@( ,***************, #&@@@@@@@@@@@@@@@&.\r\n" " %( #@@@@@@@@@@@@@%*. ./&@@@@@@@@@@@@@/ .##\r\n" " .&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%.\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@(\r\n" " &@@@@@@@@@&@@@@@@@@@@@@@@@@@@@@@&@@@@@@@@@%\r\n" " /&@@@/ .*&@@@@@@@&,. (@@@&/\r\n" " %@@@@@@@#\r\n" " .,,,,,,,.\r\n" "\r\n"; /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* 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_UART7_Init(); /* USER CODE BEGIN 2 */ HAL_GPIO_WritePin(LD_RED_GPIO_Port,LD_RED_Pin,GPIO_PIN_SET); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /** Initializes the CPU, AHB and APB busses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB busses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } } /** * @brief UART7 Initialization Function * @param None * @retval None */ static void MX_UART7_Init(void) { /* USER CODE BEGIN UART7_Init 0 */ /* USER CODE END UART7_Init 0 */ /* USER CODE BEGIN UART7_Init 1 */ /* USER CODE END UART7_Init 1 */ huart7.Instance = UART7; huart7.Init.BaudRate = 115200; huart7.Init.WordLength = UART_WORDLENGTH_8B; huart7.Init.StopBits = UART_STOPBITS_1; huart7.Init.Parity = UART_PARITY_NONE; huart7.Init.Mode = UART_MODE_TX_RX; huart7.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart7.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart7) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN UART7_Init 2 */ /* USER CODE END UART7_Init 2 */ } /** * Enable DMA controller clock */ static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE(); /* DMA interrupt init */ /* DMA1_Stream1_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 1, 0); HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn); } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LD_RED_GPIO_Port, LD_RED_Pin, GPIO_PIN_RESET); /*Configure GPIO pin : Button_Pin */ GPIO_InitStruct.Pin = Button_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(Button_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pin : LD_RED_Pin */ GPIO_InitStruct.Pin = LD_RED_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LD_RED_GPIO_Port, &GPIO_InitStruct); /* EXTI interrupt init*/ HAL_NVIC_SetPriority(EXTI2_IRQn, 1, 0); HAL_NVIC_EnableIRQ(EXTI2_IRQn); } /* USER CODE BEGIN 4 */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){ if(GPIO_Pin == Button_Pin){ HAL_Delay(500); HAL_DMA_Start_IT(&hdma_uart7_tx,(uint32_t)msg,(uint32_t)&huart7.Instance->DR,strlen(msg)); huart7.Instance->CR3|=USART_CR3_DMAT; } } void XferCpltCallback(DMA_HandleTypeDef *hdma){ if(hdma->Instance == DMA1_Stream1){ huart7.Instance->CR3&=~USART_CR3_DMAT; HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); HAL_Delay(200); HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); } } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  • UART特化方法
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * 

© Copyright (c) 2020 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */
/* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "string.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart7; DMA_HandleTypeDef hdma_uart7_tx; /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_UART7_Init(void); /* USER CODE BEGIN PFP */ /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ char msg[]="\r\n" " %@@@@@@@#\r\n" " .(&@&, &@@@@@@@% *@@&(\r\n" " %@@@@@@@@%%&@@@@@@@@@@@@@@@@@@@&%&@@@@@@@@#\r\n" " &@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/\r\n" " ,. .&@@@@@@@@@@@@@&(. ,(&@@@@@@@@@@@@@&. .,\r\n" " &@@@@&@@@@@@@@@@@&, ###%#%%%%#%%%#### *&@@@@@@@@@@@&@@@@%\r\n" " /@@@@@@@@@@@@@@@& ,@@@@@@@@&. .&@@@@@@@@@@@@@@@,\r\n" " (&@@@@@@@@@@@@@# (@@@@@@@/ %@@@@@@@@@@@@@&*\r\n" " &@@@@@@@@&. ,%@@@@&@@@@@@@&@@@&%, ,&@@@@@@@@%\r\n" " /@@@@@@@@% #@@@@@( *@@@@@@&, %@@@@&( &@@@@@@@@/\r\n" " .&@@@@@@@% #@@@@@% *@@@@@@&, &@@@@@# &@@@@@@@&. # \"There is no truth in flesh, only betrayal.\"\r\n" " ,%%%%&@@@@@@@@* &@@@@@% *@@@@@@&, %@@@@@% ,@@@@@@@@&%%%% # \"There is no strength in flesh, only weakness.\"\r\n" " /@@@@@@@@@@@@&. #@@@@@@, *@@@@@@&, ,@@@@@@( .&@@@@@@@@@@@&, # \"There is no constancy in flesh, only decay .\"\r\n" " /@@@@@@@@@@@@& %@@@@@@, *@@@@@@&, ,@@@@@@# .&@@@@@@@@@@@&, # \"There is no certainty in flesh, but death .\"\r\n" " *&@@@@@@@@@@@&, .@@@@@@# *@@@@@@&, %@@@@@& ,@@@@@@@@@@@@&. # — Credo Omnissiah\r\n" " .&@@@@@@@# .&@@@@@( *@@@@@@&, %@@@@@& %@@@@@@@&.\r\n" " (@@@@@@@@( ,&@@@@&. *@@@@@@&, *&@@@@%. #@@@@@@@@( Welcome back to Adeptus Mechanicus, Alchemic Ronin!\r\n" " %@@@@@@@@% .%@@@@&%@@@@@@@%&@@@@#. %@@@@@@@@%\r\n" " .(&@@@@@@@@@@@@, *%@@@@@@@%* (@@@@@@@@@@@@&/\r\n" " %@@@@@@@@@@@@@@@/ .(@@@@@@@@@(. #@@@@@@@@@@@@@@@#\r\n" " .&@@@@@@@@@@@@@@@@( ,***************, #&@@@@@@@@@@@@@@@&.\r\n" " %( #@@@@@@@@@@@@@%*. ./&@@@@@@@@@@@@@/ .##\r\n" " .&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%.\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@(\r\n" " &@@@@@@@@@&@@@@@@@@@@@@@@@@@@@@@&@@@@@@@@@%\r\n" " /&@@@/ .*&@@@@@@@&,. (@@@&/\r\n" " %@@@@@@@#\r\n" " .,,,,,,,.\r\n" "\r\n"; /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* 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_UART7_Init(); /* USER CODE BEGIN 2 */ HAL_GPIO_WritePin(LD_RED_GPIO_Port,LD_RED_Pin,GPIO_PIN_SET); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /** Initializes the CPU, AHB and APB busses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB busses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } } /** * @brief UART7 Initialization Function * @param None * @retval None */ static void MX_UART7_Init(void) { /* USER CODE BEGIN UART7_Init 0 */ /* USER CODE END UART7_Init 0 */ /* USER CODE BEGIN UART7_Init 1 */ /* USER CODE END UART7_Init 1 */ huart7.Instance = UART7; huart7.Init.BaudRate = 115200; huart7.Init.WordLength = UART_WORDLENGTH_8B; huart7.Init.StopBits = UART_STOPBITS_1; huart7.Init.Parity = UART_PARITY_NONE; huart7.Init.Mode = UART_MODE_TX_RX; huart7.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart7.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart7) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN UART7_Init 2 */ /* USER CODE END UART7_Init 2 */ } /** * Enable DMA controller clock */ static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE(); /* DMA interrupt init */ /* DMA1_Stream1_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 1, 0); HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn); } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LD_RED_GPIO_Port, LD_RED_Pin, GPIO_PIN_RESET); /*Configure GPIO pin : Button_Pin */ GPIO_InitStruct.Pin = Button_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(Button_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pin : LD_RED_Pin */ GPIO_InitStruct.Pin = LD_RED_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LD_RED_GPIO_Port, &GPIO_InitStruct); /* EXTI interrupt init*/ HAL_NVIC_SetPriority(EXTI2_IRQn, 1, 0); HAL_NVIC_EnableIRQ(EXTI2_IRQn); } /* USER CODE BEGIN 4 */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){ if(GPIO_Pin == Button_Pin){ HAL_Delay(500); HAL_UART_Transmit_DMA(&huart7,(uint8_t*)msg,strlen(msg)); } } void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart){ HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); HAL_Delay(200); HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

4.2.2 键盘回响

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * 

© Copyright (c) 2020 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */
/* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "string.h" #include "stdbool.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart7; DMA_HandleTypeDef hdma_uart7_rx; DMA_HandleTypeDef hdma_uart7_tx; /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_UART7_Init(void); /* USER CODE BEGIN PFP */ /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ char msg[]="\r\n" " %@@@@@@@#\r\n" " .(&@&, &@@@@@@@% *@@&(\r\n" " %@@@@@@@@%%&@@@@@@@@@@@@@@@@@@@&%&@@@@@@@@#\r\n" " &@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/\r\n" " ,. .&@@@@@@@@@@@@@&(. ,(&@@@@@@@@@@@@@&. .,\r\n" " &@@@@&@@@@@@@@@@@&, ###%#%%%%#%%%#### *&@@@@@@@@@@@&@@@@%\r\n" " /@@@@@@@@@@@@@@@& ,@@@@@@@@&. .&@@@@@@@@@@@@@@@,\r\n" " (&@@@@@@@@@@@@@# (@@@@@@@/ %@@@@@@@@@@@@@&*\r\n" " &@@@@@@@@&. ,%@@@@&@@@@@@@&@@@&%, ,&@@@@@@@@%\r\n" " /@@@@@@@@% #@@@@@( *@@@@@@&, %@@@@&( &@@@@@@@@/\r\n" " .&@@@@@@@% #@@@@@% *@@@@@@&, &@@@@@# &@@@@@@@&. # \"There is no truth in flesh, only betrayal.\"\r\n" " ,%%%%&@@@@@@@@* &@@@@@% *@@@@@@&, %@@@@@% ,@@@@@@@@&%%%% # \"There is no strength in flesh, only weakness.\"\r\n" " /@@@@@@@@@@@@&. #@@@@@@, *@@@@@@&, ,@@@@@@( .&@@@@@@@@@@@&, # \"There is no constancy in flesh, only decay .\"\r\n" " /@@@@@@@@@@@@& %@@@@@@, *@@@@@@&, ,@@@@@@# .&@@@@@@@@@@@&, # \"There is no certainty in flesh, but death .\"\r\n" " *&@@@@@@@@@@@&, .@@@@@@# *@@@@@@&, %@@@@@& ,@@@@@@@@@@@@&. # — Credo Omnissiah\r\n" " .&@@@@@@@# .&@@@@@( *@@@@@@&, %@@@@@& %@@@@@@@&.\r\n" " (@@@@@@@@( ,&@@@@&. *@@@@@@&, *&@@@@%. #@@@@@@@@( Welcome back to Adeptus Mechanicus, Alchemic Ronin!\r\n" " %@@@@@@@@% .%@@@@&%@@@@@@@%&@@@@#. %@@@@@@@@%\r\n" " .(&@@@@@@@@@@@@, *%@@@@@@@%* (@@@@@@@@@@@@&/\r\n" " %@@@@@@@@@@@@@@@/ .(@@@@@@@@@(. #@@@@@@@@@@@@@@@#\r\n" " .&@@@@@@@@@@@@@@@@( ,***************, #&@@@@@@@@@@@@@@@&.\r\n" " %( #@@@@@@@@@@@@@%*. ./&@@@@@@@@@@@@@/ .##\r\n" " .&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%.\r\n" " #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@(\r\n" " &@@@@@@@@@&@@@@@@@@@@@@@@@@@@@@@&@@@@@@@@@%\r\n" " /&@@@/ .*&@@@@@@@&,. (@@@&/\r\n" " %@@@@@@@#\r\n" " .,,,,,,,.\r\n" "\r\n"; uint8_t data[1]; bool flag=false; /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* 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_UART7_Init(); /* USER CODE BEGIN 2 */ HAL_GPIO_WritePin(LD_RED_GPIO_Port,LD_RED_Pin,GPIO_PIN_SET); HAL_GPIO_WritePin(LD_GREEN_GPIO_Port,LD_GREEN_Pin,GPIO_PIN_SET); HAL_UART_Receive_DMA(&huart7,data,1); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /** Initializes the CPU, AHB and APB busses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB busses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } } /** * @brief UART7 Initialization Function * @param None * @retval None */ static void MX_UART7_Init(void) { /* USER CODE BEGIN UART7_Init 0 */ /* USER CODE END UART7_Init 0 */ /* USER CODE BEGIN UART7_Init 1 */ /* USER CODE END UART7_Init 1 */ huart7.Instance = UART7; huart7.Init.BaudRate = 115200; huart7.Init.WordLength = UART_WORDLENGTH_8B; huart7.Init.StopBits = UART_STOPBITS_1; huart7.Init.Parity = UART_PARITY_NONE; huart7.Init.Mode = UART_MODE_TX_RX; huart7.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart7.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart7) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN UART7_Init 2 */ /* USER CODE END UART7_Init 2 */ } /** * Enable DMA controller clock */ static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE(); /* DMA interrupt init */ /* DMA1_Stream1_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 1, 0); HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn); /* DMA1_Stream3_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream3_IRQn, 1, 0); HAL_NVIC_EnableIRQ(DMA1_Stream3_IRQn); } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); __HAL_RCC_GPIOF_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LD_RED_GPIO_Port, LD_RED_Pin, GPIO_PIN_RESET); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LD_GREEN_GPIO_Port, LD_GREEN_Pin, GPIO_PIN_RESET); /*Configure GPIO pin : Button_Pin */ GPIO_InitStruct.Pin = Button_Pin; GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(Button_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pin : LD_RED_Pin */ GPIO_InitStruct.Pin = LD_RED_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LD_RED_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pin : LD_GREEN_Pin */ GPIO_InitStruct.Pin = LD_GREEN_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LD_GREEN_GPIO_Port, &GPIO_InitStruct); /* EXTI interrupt init*/ HAL_NVIC_SetPriority(EXTI2_IRQn, 1, 0); HAL_NVIC_EnableIRQ(EXTI2_IRQn); } /* USER CODE BEGIN 4 */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){ if(GPIO_Pin == Button_Pin){ HAL_Delay(500); flag=true; HAL_UART_Transmit_DMA(&huart7,(uint8_t*)msg,strlen(msg)); } } void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart){ if(flag==true){ flag=false; HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); HAL_Delay(200); HAL_GPIO_TogglePin(LD_RED_GPIO_Port,LD_RED_Pin); }else{ HAL_GPIO_TogglePin(LD_GREEN_GPIO_Port, LD_GREEN_Pin); HAL_Delay(200); HAL_GPIO_TogglePin(LD_GREEN_GPIO_Port, LD_GREEN_Pin); } } void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){ HAL_UART_Transmit_DMA(&huart7,data,1); HAL_UART_Receive_DMA(&huart7,data,1); } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

4.3 效果展示

  • 因为按键回响已经包含了一键发送信息的功能,所以视频部分就只录了按键回响的效果

http://player.bilibili.com/player.html?aid=97217251&cid=165950467&page=1

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