278 lines
6.9 KiB
C
278 lines
6.9 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 "libc.h"
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#include "buff.h"
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#ifndef BOOTLOADER
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#include "rtthread.h"
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#define MUTEX_INIT() g_mutex=rt_mutex_create("usart1_mutex",RT_IPC_FLAG_FIFO);
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#define MUTEX_DELETE() if(g_mutex) {rt_mutex_delete(g_mutex);g_mutex=0;}
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#define MUTEX_TAKE() if(g_mutex) rt_mutex_take(g_mutex,RT_WAITING_FOREVER);
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#define MUTEX_RELEASE() if(g_mutex) rt_mutex_release(g_mutex);
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void *g_mutex;
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#else
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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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#endif
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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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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_AHB1PeriphClockCmd ( USART1_TX_CLK|USART1_RX_CLK, 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 = 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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{
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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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USART_InitStructure.USART_BaudRate = USART1_BaudRate; //波特率
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USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位
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USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位
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USART_InitStructure.USART_Parity = USART_Parity_No ; //无校验
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //发送和接收模式
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 不使用硬件流控制
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USART_Init(USART1,&USART_InitStructure); //初始化串口1
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USART_Cmd(USART1,ENABLE); //使能串口1
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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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{
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USART_SendData( USART1,(u8)c ); // 发送单字节数据
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while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); //等待发送完毕
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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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{
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// MUTEX_TAKE();
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for(int i=0;i<size;i++)
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{
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USART_SendData( USART1,((u8 *)data)[i] ); // 发送单字节数据
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while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); //等待发送完毕
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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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{
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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 return EOF;
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}
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static int usart_open(void)
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{
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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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NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn; //定时器中断
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; //抢占优先级1
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NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //子优先级3
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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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{
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MUTEX_DELETE();
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn; //定时器中断
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; //抢占优先级1
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NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //子优先级3
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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,usart_puts,NULL);
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void USART1_IRQHandler (void)
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{
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uint8_t t=0;
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if(USART1->SR&USART_FLAG_RXNE)
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{
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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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}
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else
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{
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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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{
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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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USART_InitStructure.USART_BaudRate = 115200; //波特率
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USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位
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USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位
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USART_InitStructure.USART_Parity = USART_Parity_No ; //无校验
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //发送和接收模式
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 不使用硬件流控制
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USART_Init(USART3,&USART_InitStructure); //初始化串口1
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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 u8 g_key=0;
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static u8 g_keyPress=0;
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static u8 g_keyPressed=0;
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void USART3_IRQHandler (void)
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{
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u8 res=0;
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if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
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{
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g_key=USART_ReceiveData(USART3);
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if ((g_keyPress^g_key)&g_keyPress)
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{
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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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u8 USART3_GetKey(void)
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{
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u8 ret=g_key;
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//g_key=0;
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return ret;
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}
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u8 USART3_GetKeyPressed (void)
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{
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u8 ret=g_keyPressed;
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g_keyPressed=0;
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return ret;
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}
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