C8051F系列单片机串口通讯程序.docVIP

C8051F系列单片机串口通讯程序采用C8051F020单片机 //串口编程--接收PC发过来的字符串,回发字符串.发送期间中断控制LED灯闪烁//采用外部晶振22.1184MHz 使用定时器1,方式2产生波特率,SMOD = 0或者1//定时器初值X=256-SYSCLK*(SMOD+1)/(BAUDRATE*384)/#include C8051F020.h sfr16 TMR3RL = 0x92; //定时器3重装载寄存器sfr16 TMR3 = 0x94; //定时器3计数器 #define uchar unsigned char#define uint unsigned int //----------------------------------------------------------------------//参数设置区//----------------------------------------------------------------------#define BAUDRATE 4800 //波特率bps#define CLKOUT//外部晶振,修改也要修改OSCXCN#define SMODVAL 0 //SMOD的值,修改请也修改PCONVAL#define PCONVAL 0x00 //PCON的值,=0x00时SMOD0=0; =0x80时SMOD0=1#define TXVAL (256-CLKOUT*(SMODVAL+1)/BAUDRATE/384) //定时器初值#define MAX_LEN 10 //每次接收/发送字符串的长度 //---------------------------------------------------------------------//全局变量//---------------------------------------------------------------------sbit LED = P1^6; //LED 1亮 0灭bit readFlag = 0; //读标志uchar readCounts = 0; //已经读取的字符个数,与MAX_LEN比较uchar idata trdata[MAX_LEN]; //要接收/发送的字符串 //----------------------------------------------------------------------//子函数声明//----------------------------------------------------------------------void SYSCLK_Init(void); //系统时钟初始化void PORT_Init(void); //端口初始化void UART0_Init(void); //串口UART0初始化void Send_Char(uchar ch); //发送单个字符void Send_String(uchar * str, uint len); //发送一个字符串void UART0_ISR(); //串口中断服务程序,接收字符void Timer3_Init(uint counts); //定时器3初始化void Timer3_ISR(void); //定时器3中断服务程序 //----------------------------------------------------------------------//主函数//----------------------------------------------------------------------void main(void){WDTCN = 0xde; //禁止看门狗 WDTCN = 0xad; SYSCLK_Init(); //时钟初始化PORT_Init(); //端口初始化UART0_Init(); //串口初始化Timer3_Init(CLKOUT/12/10); //定时器初始化EA = 1; //开全局中断while(1){if(readFlag) //已经读取{readFlag = 0; //清零Send_String(trdata,MAX_LEN); //发送字符串}}} //----------------------------------------------------------------------//子函数具体实现//-------------------------