244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/***
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************************************************************************************
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* @file usart.c
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* @brief usart 接口相关函数
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************************************************************************************
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* @description
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*
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* 初始化USART1的引脚 PA9/PA10，
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* 配置USART1工作在收发模式、数位8位、停止位1位、无校验、不使用硬件控制流控制，
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* 串口的波特率设置为115200，若需要更改波特率直接修改usart.h里的宏定义USART1_BaudRate。
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* 重定义fputc函数,用以支持使用printf函数打印数据
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*
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************************************************************************************
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***/
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#include "usart.h"
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#include "buff.h"
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#include "libc.h"
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#include "stm32f4xx.h"
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#define MUTEX_INIT()
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#define MUTEX_DELETE()
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#define MUTEX_TAKE()
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#define MUTEX_RELEASE()
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// 函数：usart IO口初始化
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//
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void USART_GPIO_Config(void) {
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GPIO_InitTypeDef GPIO_InitStructure;
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// IO口时钟配置
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RCC_AHB1PeriphClockCmd(USART1_TX_CLK | USART1_RX_CLK, ENABLE);
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// IO配置
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用模式
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 上拉
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // 速度等级
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// 初始化 TX 引脚
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GPIO_InitStructure.GPIO_Pin = USART1_TX_PIN;
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GPIO_Init(USART1_TX_PORT, &GPIO_InitStructure);
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// 初始化 RX 引脚
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GPIO_InitStructure.GPIO_Pin = USART1_RX_PIN;
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GPIO_Init(USART1_RX_PORT, &GPIO_InitStructure);
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// IO复用，复用到USART1
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GPIO_PinAFConfig(USART1_TX_PORT, USART1_TX_PinSource, GPIO_AF_USART1);
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GPIO_PinAFConfig(USART1_RX_PORT, USART1_RX_PinSource, GPIO_AF_USART1);
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}
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// 函数：USART 口初始化
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//
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void Usart_Config(void) {
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USART_InitTypeDef USART_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
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// IO口初始化
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USART_GPIO_Config();
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// 配置串口各项参数
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// 波特率
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USART_InitStructure.USART_BaudRate = USART1_BaudRate;
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// 数据位8位
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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// 停止位1位
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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// 无校验
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USART_InitStructure.USART_Parity = USART_Parity_No;
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// 发送和接收模式
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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// 不使用硬件流控制
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USART_InitStructure.USART_HardwareFlowControl =
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USART_HardwareFlowControl_None;
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// 初始化串口1
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USART_Init(USART1, &USART_InitStructure);
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// 使能串口1
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USART_Cmd(USART1, ENABLE);
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}
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// 函数：重定义fputc函数
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//
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static int usart_putc(int c) {
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// 发送单字节数据
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USART_SendData(USART1, (uint8_t)c);
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// 等待发送完毕
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while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
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;
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return (c); // 返回字符
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}
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static int usart_puts(const void *data, int size) {
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// MUTEX_TAKE();
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for (int i = 0; i < size; i++) {
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// 发送单字节数据
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USART_SendData(USART1, ((uint8_t *)data)[i]);
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// 等待发送完毕
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while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
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;
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}
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// MUTEX_RELEASE();
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return size;
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}
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static data_buff g_recv;
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static int usart_getc(void) {
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uint8_t data;
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if (buff_read_byte(&g_recv, &data) == 0)
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return data;
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else
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return EOF;
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}
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static int usart_open(void) {
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MUTEX_INIT();
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buff_init(&g_recv, 1024, 0, 0, 0);
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/* 打开接收中断 */
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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NVIC_InitTypeDef NVIC_InitStructure;
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// 串口中断
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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// 抢占优先级1
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
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// 子优先级3
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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return 0;
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}
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static int usart_close(void) {
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MUTEX_DELETE();
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
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NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
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NVIC_Init(&NVIC_InitStructure);
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USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
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buff_deinit(&g_recv);
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return 0;
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}
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extern_device2(usart, usart_open, usart_close, usart_putc, usart_getc,
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usart_puts, NULL);
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void USART1_IRQHandler(void) {
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uint8_t t = 0;
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if (USART1->SR & USART_FLAG_RXNE) {
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t = USART1->DR;
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buff_save_byte(&g_recv, t);
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// if(g_recv_cb) g_recv_cb(t);
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} else {
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t = USART1->SR;
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t = USART1->DR;
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}
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}
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void USART3_Init(void) {
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); // IO口时钟配置
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// IO配置
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用模式
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 上拉
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // 速度等级
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// 初始化 TX 引脚
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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// 初始化 RX 引脚
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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// IO复用，复用到USART1
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);
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USART_InitTypeDef USART_InitStructure;
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
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// 配置串口各项参数
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// 波特率
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USART_InitStructure.USART_BaudRate = 115200;
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// 数据位8位
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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// 停止位1位
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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// 无校验
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USART_InitStructure.USART_Parity = USART_Parity_No;
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// 发送和接收模式
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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// 不使用硬件流控制
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USART_InitStructure.USART_HardwareFlowControl =
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USART_HardwareFlowControl_None;
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// 初始化串口
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USART_Init(USART3, &USART_InitStructure);
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// 配置中断
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; // 串口中断通道
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; // 抢占优先级3
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; // 子优先级3
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // IRQ通道使能
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NVIC_Init(&NVIC_InitStructure); // 根据指定的参数初始化VIC寄存器、
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USART_Cmd(USART3, ENABLE); // 使能串口1
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USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
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}
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// 串口3接收手柄数据
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static uint8_t g_key = 0;
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static uint8_t g_keyPress = 0;
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static uint8_t g_keyPressed = 0;
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void USART3_IRQHandler(void) {
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uint8_t res = 0;
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if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) {
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g_key = USART_ReceiveData(USART3);
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if ((g_keyPress ^ g_key) & g_keyPress) {
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// 检测按键弹起
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g_keyPressed = g_keyPress ^ g_key;
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}
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g_keyPress = g_key;
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}
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}
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uint8_t USART3_GetKey(void) {
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uint8_t ret = g_key;
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// g_key=0;
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return ret;
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}
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uint8_t USART3_GetKeyPressed(void) {
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uint8_t ret = g_keyPressed;
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g_keyPressed = 0;
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return ret;
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}
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