stm32f407UART4串口4标准例程

/*************************************************************/ /* this programme for UART4 Communication */ /* Company: New Future */ /* Programmer: windy */ /* phone: 13891912727 weixin same name */ /* Email: cjfwindy@163.com */ /* Time: 2022-08-20 17:16 */ /* Copyright(C) 2021 New Future All rights reserved */ /*************************************************************/ #include "global.h" //================================================================================= unsigned char REC4_Data[300],REC4_Count=0,Buffer4[300]; TYPE_BYTE_IO _RAMB; char* gpUart4TxAddress; /* uart transmit buffer address */ int gUart4TxCnt; /* uart transmit data number */ //================================================================================= /*----函数：向PC传输一行字符串----*/ void UART4_print(char * head) { BYTE i,j; PIN_4851RE = 0; j = strlen(head); for (i=0; i<j; i++) { UART4_Send(head[i]); } PIN_4851RE = 1; } //----------------------------------------------------------------- void Uart4_BSend(char * head, int nub) { int i; PIN_4851RE = 0; for (i=0; i<nub; i++) { UART4_Send(head[i]); } //UART4_Send(0x0D); //UART4_Send(0x0A); PIN_4851RE = 1; } //----------------------------------------------------------------- /*----函数：向串口发送一个字节的数据----*/ void UART4_Send(BYTE a) { UART4_CheckOERR(); while (!(UART4->SR & USART_SR_TXE)); UART4->DR = a; //NOP(); //while ((UART4->SR & USART_SR_TXE) != 1); //while ((UART4->SR & USART_SR_TC) != 1); while ((UART4->SR & USART_SR_TC) == 0); } //----------------------------------------------------------------- void REC4_SER(void) { if (b4Timeover) { b4Timeover = 0; F_UART4_First = 1; } if (!F_UART4_REC) return; F_UART4_REC = 0; REC4_Count = 0; // high 5A A5 05 82 03 00 00 0C if((0x05==REC4_Data[2]) && ( 0x82==REC4_Data[3]) && (0x03==REC4_Data[4]) && (0x00==REC4_Data[5])) { high = REC4_Data[6]<<8; high = high + REC4_Data[7]; WriteMemory3(0x300, high); } // high 5A A5 05 82 03 30 00 0C if((0x05==REC4_Data[2]) && ( 0x82==REC4_Data[3]) && (0x03==REC4_Data[4]) && (0x30==REC4_Data[5])) { VDistance = REC4_Data[6]<<8; VDistance = VDistance + REC4_Data[7]; WriteMemory3(0x330, VDistance); } } //----------------------------------------------------------------- void UART4TX_SER(void) { if (0 == gUart4TxCnt) return; if (!(UART4->SR & USART_SR_TC)) return; UART4_CheckOERR(); if( gUart4TxCnt > 0 ) { UART4->DR = *gpUart4TxAddress; gpUart4TxAddress++; gUart4TxCnt--; if (0 == gUart4TxCnt) { while ((UART4->SR & USART_SR_TC) != 1); PIN_4851RE = 1; } } } //================================================================================= // 初始化IO 串口1 // pclk2:PCLK2时钟频率(Mhz) // bound:波特率 void uart4_init(u32 pclk1,u32 bound) { float temp; u16 mantissa; u16 fraction; temp = (float)(pclk1*1000000)/(bound*16); // 得到USARTDIV mantissa = temp; // 得到整数部分 fraction = (temp-mantissa)*16; // 得到小数部分 mantissa <<= 4; mantissa += fraction; RCC->AHB1ENR |= 1<<2; // 使能PORTC时钟 RCC->APB1ENR |= 1<<19; // 使能串口时钟 GPIO_Set(GPIOC,PIN10|PIN11,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_50M,GPIO_PUPD_PU);//PC10,PC11,复用功能,上拉输出 GPIO_AF_Set(GPIOC,10,8); //PC10,AF8 GPIO_AF_Set(GPIOC,11,8); RCC->APB1RSTR |= 1<<19; // 复位串口1 RCC->APB1RSTR &= ~(1<<19); // 停止复位 //波特率设置 UART4->BRR = mantissa; // 波特率设置 UART4->CR1 |= 0X200C; // 1位停止,无校验位. //使能接收中断 UART4->CR1 |= 1<<2; // 串口接收使能 UART4->CR1 |= 1<<5; // 接收缓冲区非空中断使能 MY_NVIC_Init(3,3,UART4_IRQn,2); // 组2，最低优先级 } //----------------------------------------------------------------- BYTE UART4_CheckOERR(void) { BYTE volatile Temp; // volatile 防止被优化 if(UART4->SR & 0x000F) // 1: Overrun error is detected { Temp = UART4->SR; Temp = UART4->DR; //Temp++; return 1; } return 0; } //----------------------------------------------------------------- void UART4_SendData( char* txbuf, int txnum ) { if( txnum < 1 ){ return; } PIN_4851RE = 0; UART4_CheckOERR(); while (!(UART4->SR & USART_SR_TXE)); gpUart4TxAddress = txbuf; gUart4TxCnt = txnum; if( txnum == 1) { UART4->DR = *gpUart4TxAddress; gUart4TxCnt--; } else { UART4->DR = *gpUart4TxAddress; gpUart4TxAddress++; gUart4TxCnt--; } } //=================================================================================