HAL库：STM32F407"/>
基于HAL库：STM32F407
目录
1. 下载HAL 库
2. 配置工程
3. 测试
STM32F407_Discovery这个板子可快速搭建音频开发相关，无论是官方的参数示例，或者是HAL库代码中给出的示例，都不带串口调试这部分的，音频开发涉及IIC/IIS以及PDM麦克风等模块，GPIO口有限，很多具有串口复用功能的GPIO都给了其他模块，如果强制配成串口进行调试，音频链路运行的过程中输出就会不正常，开发过程中使用其他调试手段也可以，但是个人感觉串口有时候更容易排查，更直观。
经过尝试和代码的详细排查，发现运行实例Audio_playback_and_record的时候，串口2的tx可用，对应的GPIO是PA2。
本文基于STM32 HAL 库版本：STM32Cube_FW_F4_V1.27.0
1. 下载HAL 库
下载链接：.html
下载需要注册一个ST账户，两个资源包都要下载，然后解压到同一个目录即可：
2. 配置工程
Audio_playback_and_record是官方自带的一个音频开发示例，接下来要添加串口打印功能。
在配置文件stm32f4xx_hal_conf.h中将uart模块功能打开：
STM32F4-Discovery\Applications\Audio\Audio_playback_and_record\Inc\stm32f4xx_hal_conf.h
工程中加入uart的hal库驱动文件：stm32f4xx_hal_uart.c
在用户src目录下新增一个文件uart2.c，代码如下：
/* Includes ------------------------------------------------------------------*/
#include "main.h"/* UART handler declaration */
UART_HandleTypeDef UartHandle;//重写printf底层函数接口
int fputc(int c, FILE *stream)
{USART2->DR=c; //发送一个字符while(!(USART2->SR&1<<7)){}return c;
}//重写scanf底层函数接口 /* 不要配rx功能，因为rx引脚和其他模块有冲突 */
//int fgetc(FILE *stream)
//{
// while(!(USART2->SR&1<<5)){}
// return USART2->DR;
//}int uart2_init(uint32_t BaudRate)
{/*##-1- Configure the UART peripheral ######################################*//* Put the USART peripheral in the Asynchronous mode (UART Mode) *//* UART1 configured as follow:- Word Length = 8 Bits- Stop Bit = One Stop bit- Parity = None- BaudRate = 9600 baud- Hardware flow control disabled (RTS and CTS signals) */UartHandle.Instance = USARTx;UartHandle.Init.BaudRate = BaudRate;UartHandle.Init.WordLength = UART_WORDLENGTH_8B;UartHandle.Init.StopBits = UART_STOPBITS_1;UartHandle.Init.Parity = UART_PARITY_NONE;UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
// UartHandle.Init.Mode = UART_MODE_TX_RX;UartHandle.Init.Mode = UART_MODE_TX;UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;if(HAL_UART_Init(&UartHandle) != HAL_OK){return HAL_ERROR;}return HAL_OK;
}
对应地在用户目录inc下新增一个文件uart2.h：
#ifndef __UART2_H__
#define __UART2_H__
#include "stm32f4xx_hal.h"int uart2_init(uint32_t BaudRate);
#endif /* __UART2_H__ */在用户目录inc下的main.h新增代码，主要是定义了复用功能串口的GPIO，新增部分代码如下：
#include "uart2.h"....................
..................../* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* User can use this section to tailor USARTx/UARTx instance used and associatedresources */
/* Definition for USARTx clock resources */
#define USARTx USART2
#define USARTx_CLK_ENABLE() __HAL_RCC_USART2_CLK_ENABLE();
#define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()#define USARTx_FORCE_RESET() __HAL_RCC_USART2_FORCE_RESET()
#define USARTx_RELEASE_RESET() __HAL_RCC_USART2_RELEASE_RESET()/* Definition for USARTx Pins */
#define USARTx_TX_PIN GPIO_PIN_2
#define USARTx_TX_GPIO_PORT GPIOA
#define USARTx_TX_AF GPIO_AF7_USART2
#define USARTx_RX_PIN GPIO_PIN_3
#define USARTx_RX_GPIO_PORT GPIOA
#define USARTx_RX_AF GPIO_AF7_USART2/* Exported macro ------------------------------------------------------------*/
#define COUNTOF(__BUFFER__) (sizeof(__BUFFER__) / sizeof(*(__BUFFER__)))
/* Exported functions ------------------------------------------------------- */
main.h完整代码如下：
/********************************************************************************* @file Audio/Audio_playback_and_record/Inc/main.h* @author MCD Application Team* @brief Header for main.c module.******************************************************************************* @attention** Copyright (c) 2017 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************//* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __MAIN_H
#define __MAIN_H/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
#include "stm32f4_discovery.h"
#include "stm32f4_discovery_audio.h"
#include "stm32f4_discovery_accelerometer.h"
#include <stdio.h>
#include "stm32f4xx_it.h"
#include "waveplayer.h"#include "waverecorder.h"
#include "ff.h"
#include "ff_gen_drv.h"
#include "usbh_diskio_dma.h"
#include "uart2.h"/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Uncomment this define to disable repeat feature */
/* #define PLAY_REPEAT_DISABLED */typedef enum
{APPLICATION_IDLE = 0,APPLICATION_START,APPLICATION_RUNNING,
}
MSC_ApplicationTypeDef;
/* You can change the Wave file name as you need, but do not exceed 11 characters */
#define WAVE_NAME "0:audio_sample.wav"
#define REC_WAVE_NAME "0:rec.wav"/* State Machine for the USBH_USR_ApplicationState */
#define USBH_USR_FS_INIT ((uint8_t)0x00)
#define USBH_USR_AUDIO ((uint8_t)0x01)/* Defines for the Audio used commands */
#define CMD_PLAY ((uint32_t)0x00)
#define CMD_RECORD ((uint32_t)0x01)
#define CMD_STOP ((uint32_t)0x02)/* Defines for LEDs lighting */
#define LED3_TOGGLE 0x03 /* Toggle LED3 */
#define LED4_TOGGLE 0x04 /* Toggle LED4 */
#define LED6_TOGGLE 0x06 /* Toggle LED6 */
#define LEDS_OFF 0x07 /* Turn OFF all LEDs */
#define STOP_TOGGLE 0x00 /* Stop LED Toggling *//* Defines for the Audio playing process */
#define PAUSE_STATUS ((uint32_t)0x00) /* Audio Player in Pause Status */
#define RESUME_STATUS ((uint32_t)0x01) /* Audio Player in Resume Status */
#define IDLE_STATUS ((uint32_t)0x02) /* Audio Player in Idle Status */#define REPEAT_ON ((uint32_t)0x00) /* Replay Status in ON */
#define REPEAT_OFF ((uint32_t)0x01) /* Replay Status in OFF *//* Defines for MEMS Acclerometer ID Types */
#define MEMS_LIS3DSH 0x3F /* LIS3DSH MEMS Acclerometer ID */
#define MEMS_LIS302DL 0x3B /* LIS302DL MEMS Acclerometer ID *//* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
void Error_Handler(void);/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* User can use this section to tailor USARTx/UARTx instance used and associatedresources */
/* Definition for USARTx clock resources */
#define USARTx USART2
#define USARTx_CLK_ENABLE() __HAL_RCC_USART2_CLK_ENABLE();
#define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()#define USARTx_FORCE_RESET() __HAL_RCC_USART2_FORCE_RESET()
#define USARTx_RELEASE_RESET() __HAL_RCC_USART2_RELEASE_RESET()/* Definition for USARTx Pins */
#define USARTx_TX_PIN GPIO_PIN_2
#define USARTx_TX_GPIO_PORT GPIOA
#define USARTx_TX_AF GPIO_AF7_USART2
#define USARTx_RX_PIN GPIO_PIN_3
#define USARTx_RX_GPIO_PORT GPIOA
#define USARTx_RX_AF GPIO_AF7_USART2/* Exported macro ------------------------------------------------------------*/
#define COUNTOF(__BUFFER__) (sizeof(__BUFFER__) / sizeof(*(__BUFFER__)))
/* Exported functions ------------------------------------------------------- */#endif /* __MAIN_H */
最后在用户src目录下，新增文件：stm32f4xx_hal_msp.c，重写一些初始化API，主要是对GPIO的初始化操作，该文件内容如下：
/********************************************************************************* @file UART/UART_TwoBoards_ComPolling/Src/stm32f4xx_hal_msp.c* @author MCD Application Team* @version V1.2.5* @date 29-January-2016* @brief HAL MSP module.******************************************************************************* @attention** <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>** Redistribution and use in source and binary forms, with or without modification,* are permitted provided that the following conditions are met:* 1. Redistributions of source code must retain the above copyright notice,* this list of conditions and the following disclaimer.* 2. Redistributions in binary form must reproduce the above copyright notice,* this list of conditions and the following disclaimer in the documentation* and/or other materials provided with the distribution.* 3. Neither the name of STMicroelectronics nor the names of its contributors* may be used to endorse or promote products derived from this software* without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.********************************************************************************//* Includes ------------------------------------------------------------------*/
#include "main.h"/** @addtogroup STM32F4xx_HAL_Examples* @{*//** @defgroup UART_TwoBoards_ComPolling* @{*//* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*//** @defgroup HAL_MSP_Private_Functions* @{*//*** @brief UART MSP Initialization* This function configures the hardware resources used in this example:* - Peripheral's clock enable* - Peripheral's GPIO Configuration* @param huart: UART handle pointer* @retval None*/
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{GPIO_InitTypeDef GPIO_InitStruct;/*##-1- Enable peripherals and GPIO Clocks #################################*//* Enable GPIO TX/RX clock */USARTx_TX_GPIO_CLK_ENABLE();
// USARTx_RX_GPIO_CLK_ENABLE();/* Enable USART2 clock */USARTx_CLK_ENABLE();/*##-2- Configure peripheral GPIO ##########################################*//* UART TX GPIO pin configuration */GPIO_InitStruct.Pin = USARTx_TX_PIN;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FAST;GPIO_InitStruct.Alternate = USARTx_TX_AF;HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);/* UART RX GPIO pin configuration */
// GPIO_InitStruct.Pin = USARTx_RX_PIN;
// GPIO_InitStruct.Alternate = USARTx_RX_AF;
//
// HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
}/*** @brief UART MSP De-Initialization* This function frees the hardware resources used in this example:* - Disable the Peripheral's clock* - Revert GPIO configuration to their default state* @param huart: UART handle pointer* @retval None*/
void HAL_UART_MspDeInit(UART_HandleTypeDef *huart)
{/*##-1- Reset peripherals ##################################################*/USARTx_FORCE_RESET();USARTx_RELEASE_RESET();/*##-2- Disable peripherals and GPIO Clocks #################################*//* Configure UART Tx as alternate function */HAL_GPIO_DeInit(USARTx_TX_GPIO_PORT, USARTx_TX_PIN);/* Configure UART Rx as alternate function */HAL_GPIO_DeInit(USARTx_RX_GPIO_PORT, USARTx_RX_PIN);
}/*** @}*//*** @}*//*** @}*//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
注：不配rx功能，到此为止，已经实现了串口2的初始化以及GPIO的初始化。用户src目录下新增两个文件：
3. 测试
main.c测试代码如下：
/* Includes ------------------------------------------------------------------*/
#include "main.h"
static void SystemClock_Config(void);int main(void)
{/* STM32F4xx HAL library initialization:- Configure the Flash prefetch, instruction and Data caches- Configure the Systick to generate an interrupt each 1 msec- Set NVIC Group Priority to 4- Global MSP (MCU Support Package) initialization*/HAL_Init();/* Configure LED3, LED4, LED5 and LED6 */BSP_LED_Init(LED3);BSP_LED_Init(LED4);BSP_LED_Init(LED5);BSP_LED_Init(LED6);/* Configure the system clock to 168 MHz */SystemClock_Config();/* 串口2初始化: 只用tx功能 */if(uart2_init(9600)){Error_Handler();}printf("main\n");while(1) {BSP_LED_On(LED6);HAL_Delay(1000);BSP_LED_Off(LED6);HAL_Delay(1000);printf("main: %d\n", 666);}return 0;
}/*** @brief System Clock Configuration* The system Clock is configured as follow :* System Clock source = PLL (HSE)* SYSCLK(Hz) = 168000000* HCLK(Hz) = 168000000* AHB Prescaler = 1* APB1 Prescaler = 4* APB2 Prescaler = 2* HSE Frequency(Hz) = 8000000* PLL_M = 8* PLL_N = 336* PLL_P = 2* PLL_Q = 7* VDD(V) = 3.3* Main regulator output voltage = Scale1 mode* Flash Latency(WS) = 5* @param None* @retval None*/
static void SystemClock_Config(void)
{RCC_ClkInitTypeDef RCC_ClkInitStruct;RCC_OscInitTypeDef RCC_OscInitStruct;/* Enable Power Control clock */__HAL_RCC_PWR_CLK_ENABLE();/* The voltage scaling allows optimizing the power consumption when the device isclocked below the maximum system frequency, to update the voltage scaling valueregarding system frequency refer to product datasheet. */__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);/* Enable HSE Oscillator and activate PLL with HSE as source */RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM = 8;RCC_OscInitStruct.PLL.PLLN = 336;RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;RCC_OscInitStruct.PLL.PLLQ = 7;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2clocks dividers */RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK){Error_Handler();}/* STM32F405x/407x/415x/417x Revision Z devices: prefetch is supported */if (HAL_GetREVID() == 0x1001){/* Enable the Flash prefetch */__HAL_FLASH_PREFETCH_BUFFER_ENABLE();}
}编译下载，可看到板子LED灯闪烁，且串口有输出：
注：PA2是板子的TX引脚。
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