3、C8051F410按键发串口数据.rar_C8051F410 串口_C8051F410串口_三路串口C8051

/*使用C8051F410，内部晶振24.5M不分频*/ //波特率设为115200 #include "c8051f410.h" sbit S2=P0^2; // S ='0' means switch pressed sbit S3=P0^3; sbit LED3=P1^2; // LED ='0' means ON sbit LED2=P1^3; bit key2_down_flag=0; bit key3_down_flag=0; bit serial_busy=0; void delay(int i) { while(--i); } main(void) { PCA0MD &= ~0x40; // WDTE = 0 关闭看门狗，上电默认打开 XBR0|=0x01; //在外设连接寄存器0上把UART0连接到引脚P0.4和P0.5 XBR1= 0x40; //打开交叉开关，使能弱上拉，要使GPIO生效，必须打开交叉开关 OSCICN |=0x07; //系统时钟选择为内部振荡器不分频，即24.5M while (!(OSCICN & 0x40)); //等待内部振荡器输出稳定后离开循环 /*初始化定时器1*/ TMOD|=0x20; //定时器1工作在8位自动重装方式 CKCON|=0x08; //定时器1时钟源选择为系统时钟不分频 TH1=150; //采用默认的24.5M时钟，根据公式计算当波特率为115200时，TH1=150; TL1=0; TR1=1; //ET1=1; //开启定时器1中断允许 /*初始化串口*/ S0MODE=0; //8位的UART工作方式 REN0=1; //接收允许 ES0=1; //打开串口中断 EA=1; //允许所有中断 while (1) { if (S2 == 0) { if(!key2_down_flag) { while(serial_busy); SBUF0='A'; serial_busy=1; while(serial_busy); SBUF0='B'; serial_busy=1; while(serial_busy); SBUF0='C'; serial_busy=1; key2_down_flag=1; LED2=0; // Turn on LED } } else { key2_down_flag=0; LED2=1; // Else, turn it off } if (S3 == 0) { if(!key3_down_flag) { while(serial_busy); SBUF0='a'; serial_busy=1; while(serial_busy); SBUF0='b'; serial_busy=1; while(serial_busy); SBUF0='c'; serial_busy=1; key3_down_flag=1; LED3=0; // Turn on LED } } else { key3_down_flag=0; LED3=1; // Else, turn it off } delay(3000); } // end of while(1) } /*串口中断服务程序*/ void uart0(void) interrupt 4 { if(TI0) { TI0=0; serial_busy=0; } else RI0=0; }