STC12C5A系列单片机串口编程.doc

STC12C5A系列单片机串口编程串口头文件uart.h如下：=/* File : uart.h* Description : This file is UART driver header of STC12C5A serial signal chip.* Author : Chao* Copyright : Chao* * History* -* Rev : 0.0* Date : 20/08/2011* * create.* -*/#ifndef UART_H_#define UART_H_/-Config-/#define UART1_EN /使能串口1#define UART1_RECEIVE_EN /允许串口1中断接收函数#define UART2_EN /使能串口2#define UART2_RECEIVE_EN /允许串口2中断接收函数/#define ECHO /使能回显/-Defines-/#define SystemFosc 22118400 /系统时钟：22.1184MHz#define UartBaud 9600 /串口波特率#define UART_BUFFER_SIZE 16 /串口数据缓冲区大小#define UartEndChar /串口数据结束字符/-Type define-/typedef struct unsigned int receive_flag; /数据接收标志unsigned char data_length; /数据缓冲区中有效数据个数 unsigned char receive_bufferUART_BUFFER_SIZE; /数据接收缓冲区void (* init)(void); /串口初始化函数void (* send_byte)(unsigned char ddata); /发送单个字符void (* send_string)(unsigned char *ddata, unsigned char length); /发送字符串 UART_T;/-Extern-/#ifdef UART1_ENextern UART_T uart1;#endif#ifdef UART2_ENextern UART_T uart2;#endif#endif /*UART_H_*/=串口编程C程序文件uart.c如下：=/* File : uart.c* Description : This file is UART driver of STC12C5A serial signal chip.* Author : Chao* Copyright : Chao* * History* -* Rev : 0.0* Date : 20/08/2011* * create.* -*/-Include files-/#include#includeuart.h/-Function Prototype-/#ifdef UART1_ENstatic void uart1_init(void); /串口1初始化函数static void uart1_send_byte(unsigned char ddata); /串口1发送单个字符static void uart1_send_string(unsigned char *ddata, unsigned char length); /串口1发送字符串 #endif#ifdef UART2_ENstatic void uart2_init(void); /串口2初始化函数static void uart2_send_byte(unsigned char ddata); /串口2发送单个字符static void uart2_send_string(unsigned char *ddata, unsigned char length); /串口2发送字符串#endif/-Variable-/unsigned long Fosc; /波特率设定时中间变量#ifdef UART1_EN UART_T uart1 = 0, / receive_flag0, / data_lengthHellon, / receive_bufferuart1_init, / inituart1_send_byte, / send_byteuart1_send_string / send_string;unsigned char uart1_receive_temp;unsigned char *uart1_receive_point=uart1.receive_buffer;#endif#ifdef UART2_ENunsigned char uart1_receive_temp;UART_T uart2 = 0, / receive_flag0, / data_lengthHellon, / receive_bufferuart2_init, / inituart2_send_byte, / send_byteuart2_send_string, / send_string;unsigned char uart2_receive_temp;unsigned char *uart2_receive_point=uart2.receive_buffer;#endif#ifdef UART1_EN/* * - FUNCTION -* Name : uart1_init * Description : 串口1初始化程序 * -*/ static void uart1_init(void) unsigned long baud;/选择波特率产生方式：采用独立波特率发生器AUXR |= S1BRS;/设定波特率发生器重新计数初值Fosc = SystemFosc/32;baud = UartBaud;if(baud 9600) AUXR |= BRTx12; /时钟频率不分频elseFosc /= 12;BRT = 256-Fosc/baud;/启动波特率发生器AUXR |= BRTR;SCON = 0x50; /设定串口1工作方式：方式1（8n1），允许接收 ES = 1; /开串口1中断/* * = FUNCTION -* Name : uart1_send_byte * Description : 串口1发送单个字节数据 * -*/ static void uart1_send_byte(unsigned char ddata) SBUF = ddata; /写入要发送的字符while(!TI); /等待发送完毕TI = 0; /清发送标志/* * = FUNCTION -* Name : uart1_send_string * Description : 串口1发送以0结尾的字符串 * -*/ static void uart1_send_string(unsigned char *ddata, unsigned char length) while(length-)uart1_send_byte(*ddata+); #ifdef UART1_RECEIVE_EN/* * = FUNCTION -* Name : ISR_uart1 * Description : 串口1中断数据接收程序* -*/void ISR_uart1(void) interrupt 4if(RI) /确认接收到字符uart1_receive_temp = SBUF;#ifdef ECHOuart1.send_byte(uart1_receive_temp);#endifif(uart1_receive_temp != UartEndChar) /如果没有接收到（假设接收缓冲区足够大） *uart1_receive_point+ = uart1_receive_temp;uart1.data_length+;elseuart1_receive_point = uart1.receive_buffer; /重新将接收字符指针指向接收缓冲区头uart1.receive_flag = 1; /置位接收命令完成标志RI = 0; /清接收标志 #endif#endif#ifdef UART2_EN/* * = FUNCTION -* Name : uart2_init * Description : 串口1初始化程序 * -*/ static void uart2_init(void) #ifndef UART1_ENunsigned long baud;/选择波特率产生方式：采用独立波特率发生器AUXR |= S1BRS;/设定波特率发生器重新计数初值Fosc = SystemFosc/32;baud = UartBaud;if(baud 9600) AUXR |= BRTx12; /时钟频率不分频elseFosc /= 12;BRT = 256-Fosc/UartBaud;/启动波特率发生器AUXR |= BRTR;#endifS2CON=0x50; /设定串口工作方式：方式1（8n1），允许接收IE2=0x01; /允许串口2中断/* * - FUNCTION -* Name : uart2_send_byte * Description : 串口2发送单个字节数据 * -*/ static void uart2_send_byte(unsigned char ddata) S2CON &= 0xFD; /清发送标志S2BUF = ddata; /发送数据while(!(S2CON&0x02); /等待发送完成/* * = FUNCTION -* Name : uart2_send_string * Description : 串口2发送以0结尾的字符串 * -*/ static void uart2_send_string(unsigned char *ddata, unsigned char length) while(length-)uart2_send_byte(*ddata+); #ifdef UART2_RECEIVE_EN/* * - FUNCTION -* Name : ISR_uart2 * Description : 串口2中断数据接收程序* -*/ void ISR_uart2(void) interrupt 8 /单片机接收从机发来的数据if(S2CON&0x01) /如果接收到数据uart2_receive_temp = S2BUF; /读取数据#ifdef ECHOuart2.send_byte(uart2_receive_temp);#endifif(uart2_receive_temp != UartEndChar) /如果没有接收到（假设接收缓冲区足够大） *uart2_receive_point+ = uart2_receive_temp;uart2.data_length+;elseuart2_receive_point = uart2.receive_buffer; /重新将接收字符指针指向接收缓冲区头uart2.receive_flag = 1; /置位接收命令完成标志S2CON &= 0xFE; /清接收标志 #endif#endif=通过上面两个文件，就能很方便的实现STC12C5A系列单片机中串口操作，并且能够通过配置uart.h文件来实现串口1、串口2的条件编译，测试主函数main.c如下：=#include#includeuart.hvoid Sys_init(void); /系统初始化void main()Sys_init();while(1)if(uart1.receive_flag)uart1.send_string(uart1.receive_buffer, uart1.data_length);uart1.receive_flag = 0;uart1.data_length = 0; if(uart2.receive_flag)uart2.send_string(uart2.receive_buffer, uart2.data_length);uart2.receive_flag = 0;uart2.data_length = 0; void Sys_init(void) /系统初始化uart1.init();uart1.send_string(uart1rn,7);uart2.i