STM32F4 IAR 官方库文件配置 USART1 实现简单的发送文件

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STM32F407xx内嵌四个通用同步/异步接收器（USART1，USART2，USART3 和USART6）和两个通用异步收发器（UART4和UART5）。这6个接口提供异步通信的IrDASIR ENDEC支持，多机通信模式，单线半双工通信模式LIN主/从功能。 USART1和USART6接口能够速度高达10.5 Mbit / s的通信其他可用的接口通信高达5.25bit/s。USART1，USART2，USART3和USART6还提供硬件管理的CTS，RTS信号，智能卡的模式（ISO7816兼容）和类似的SPI通信能力。所有接口都可以通过DMA控制器

这里只使用了两根线的最简单串口设置。

硬件环境：STM32F4-Discovery

软件环境：IAR6.6 for arm

实现的功能：

1、串口初始化，

2、通过串口发送数据

用的GPIO是PB6，PB7

下面是官方给的库的使用说明

===================================================================

* How to usethis driver

* ===================================================================

* 1. Enable peripheral clock using thefollwoing functions

* RCC_APB2PeriphClockCmd(RCC_APB2Periph_USARTx, ENABLE) for USART1 andUSART6

* RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx,ENABLE) for USART2, USART3, UART4 or UART5.

* 2. According to the USART mode, enable the GPIO clocks using

* RCC_AHB1PeriphClockCmd()function. (The I/O can be TX, RX, CTS,

* or/and SCLK).

* 3. Peripheral's alternate function:

* - Connect the pin to thedesired peripherals' Alternate

* Function (AF) usingGPIO_PinAFConfig() function

* - Configure the desired pin inalternate function by:

* GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF

* - Select the type,pull-up/pull-down and output speed via

* GPIO_PuPd, GPIO_OType andGPIO_Speed members

* - Call GPIO_Init() function

* 4. Program the Baud Rate, Word Length, Stop Bit, Parity, Hardware

* flow control andMode(Receiver/Transmitter) using the USART_Init()

* function.

* 5. For synchronous mode, enable theclock and program the polarity,

* phase and last bit using theUSART_ClockInit() function.

* 5. Enable the NVIC and thecorresponding interrupt using the function

* USART_ITConfig() if you need to useinterrupt mode.

* 6. When using the DMA mode

* - Configure the DMA usingDMA_Init() function

* - Active the needed channelRequest using USART_DMACmd() function

* 7. Enable the USART using theUSART_Cmd() function.

* 8. Enable the DMA using the DMA_Cmd()function, when using DMA mode.

* Refer to Multi-Processor,LIN, half-duplex, Smartcard, IrDA sub-sections

* for more details

* In order to reach highercommunication baudrates, it is possible to

* enable the oversampling by 8 modeusing the function USART_OverSampling8Cmd().

* This function should be called afterenabling the USART clock (RCC_APBxPeriphClockCmd())

* and before calling the functionUSART_Init().

设置步骤：

1 使能USART相关时钟。

2.使能对应GPIO的时钟。

3.配置对应引脚的复用功能

4.配置USART信息

5.发送

前4步已经封装到对应的配置函数中：

/*********************************************************************************************************************************************************

* Function name : USART_Config()

* Descriptions : --初始化串口基本配置

* input parameters : 无

* output parameters: 无

* Returned value : 无

* author : 2014/5/2, by KingSong

***********************************************************************************************************************************************************/

void USART_Config()

{

USART_InitTypeDefUSART_InitStructure; // 初始化串口1用结构体

USART_DeInit(USART1); //初始化串口1名称复位RCC时钟值

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //初始化串口1的时钟

USART_Gpio_Config(); //端口映射映射 PA6 PA7

USART_StructInit(&USART_InitStructure); //初始化串口1的基本数据 8bit 无校验停止位一位

USART_Init(USART1,&USART_InitStructure); //写入串口1配置信息

USART_Cmd(USART1,ENABLE); //使能串口1模块

USART_ClearFlag(USART1,USART_FLAG_TC); //清除发送标志位

}

/*********************************************************************************************************************************************************

* Function name : USART_Gpio_Config()

* Descriptions : --串口端口映射

* input parameters : 无

* output parameters: 无

* Returned value : 无

* author : 2014/5/2, by KingSong

***********************************************************************************************************************************************************/

void USART_Gpio_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB ,ENABLE);

//PB6->TX PB7->Rx

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 |GPIO_Pin_7;

GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_UP;

GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_USART1);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_USART1);

}

完整的程序如下

#include<my_config.h>

#include "delay.h"

#include "misc.h"

USART_InitTypeDefUSART_InitStructure;

void main ()

{

// NVIC_Config();

USART_Config();

// NVIC_Init();

LED_Init();

while(1)

{

if(USART_ReceiveData(USART1))

{

LEDOn(LED1);

}

delay_ms(100);

USART_SendData(USART1,0xff);

}

#ifdef USE_FULL_ASSERT

/**

* @brief Reports the name of the source file and thesource line number

* where the assert_param error hasoccurred.

* @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 can add his ownimplementation to report the file name and line number,

ex: printf("Wrongparameters value: file %s on line %d\r\n", file, line) */

/* Infinite loop */

while (1)

{

}

#endif

/**

* @}

/**

* @}

/******************* *****END OFFILE****/

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