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#include "usart.h"
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uint8_t parameter[48];
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/***************************************************************
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*函数名称：USART_GPIOConfiguration(void)
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*函数功能：STM32串口通信IO口及时钟配置
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*输入参数：无
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*输出参数：无
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*备注：该函数是static类型的函数。
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***************************************************************/
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static void GPIO_Configuration(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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/*使能GPIOA和UASRT1*/
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);//使能DMA1时钟
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/*配置USART中的Tx*/
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/*配置USART中的Rx*/
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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}
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/*************************************************************
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*函数名称：USART_NVICConfig(void)
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*函数功能：确定USART中断的优先级
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*输入：无
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*输出：无
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*备注：无
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*************************************************************/
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static void USART_NVICConfig(void)
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{
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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/*************************************************************
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*函数名称：USART_Config(void)
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*函数功能：初始化USART
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*输入：无
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*输出：无
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*备注：无
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*************************************************************/
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static void USART_Config(void)
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{
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USART_InitTypeDef USART_InitStructure;
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USART_InitStructure.USART_BaudRate = 9600;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_Init(USART1,&USART_InitStructure);
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USART_Cmd(USART1, ENABLE);
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/*运行此命令立即执行DMA传输*/
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USART_DMACmd(USART1, USART_DMAReq_Rx,ENABLE);
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}
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/*************************************************************
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*函数名称：USART_DMAConfig()
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*函数功能：配置DMA
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*输入：无
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*输出：无
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*************************************************************/
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static void USART_DMAConfig(void)
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{
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DMA_InitTypeDef DMA_InitStructure;
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DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_Base;//将USART_DR作为外设基地址
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DMA_InitStructure.DMA_MemoryBaseAddr = (u32)parameter;//设置内存地址
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//以外设作为数据的来源
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DMA_InitStructure.DMA_BufferSize = 48;//设置数据传输的长度
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不变
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存地址自增
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//DMA传输数据大小
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//DMA传输数据大小
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DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循环模式
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DMA_InitStructure.DMA_Priority = DMA_Priority_High;//DMA优先级高
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DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//禁止内存到内存的传输
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DMA_Init(DMA1_Channel5, &DMA_InitStructure);//对DMA初始化
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DMA_ITConfig(DMA1_Channel5,DMA_IT_TC, ENABLE);//使能或者失能指定的通道x中断(DMA1 通道2)
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DMA_Cmd(DMA1_Channel5,ENABLE);
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}
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/*************************************************************
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*函数名称：USART_Init(void)
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*函数功能：初始化USART
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*输入：无
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*输出：无
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*调用函数：void GPIO_Configuration(void)<EFBFBD>void USART_Config(void)
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*************************************************************/
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void USARTInit(void)
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{
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GPIO_Configuration();
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USART_Config();
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USART_DMAConfig();
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USART_NVICConfig();
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}
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//串口输出函数
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int fputc(int ch,FILE *f)
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{
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USART_SendData(USART1, (uint8_t) ch);
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while(USART_GetFlagStatus(USART1, USART_FLAG_TXE)==RESET);
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return ch;
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}
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//串口接受函数
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int fgetc(FILE *f)
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{
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while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE)==RESET);
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return (int)USART_ReceiveData(USART1);
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}
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