led.c

在C8051F02XX上的LED显示,读键盘程序

#include <c8051f020.h>

//------------------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F02x
//------------------------------------------------------------------------------------

sfr16 DP       = 0x82;                    // data pointer
sfr16 TMR3RL   = 0x92;                    // Timer3 reload value
sfr16 TMR3     = 0x94;                    // Timer3 counter
sfr16 ADC0     = 0xbe;                    // ADC0 data
sfr16 ADC0GT   = 0xc4;                    // ADC0 greater than window
sfr16 ADC0LT   = 0xc6;                    // ADC0 less than window
sfr16 RCAP2    = 0xca;                    // Timer2 capture/reload
sfr16 T2       = 0xcc;                    // Timer2
sfr16 RCAP4    = 0xe4;                    // Timer4 capture/reload
sfr16 T4       = 0xf4;                    // Timer4
sfr16 DAC0     = 0xd2;                    // DAC0 data
sfr16 DAC1     = 0xd5;                    // DAC1 data

#define SYSCLK 2000000

void PORT_Init (void);					//端口初始化
void Timer3_Init (int counts);			//定时器初始化
void Timer3_ISR (void);					//定时中断服务程序

void main(void)
{
	// 禁止看门狗定时
   WDTCN = 0xde;
   WDTCN = 0xad;
	
   PORT_Init ();
   Timer3_Init (SYSCLK / 12/ 3);        // 初始化定时中断3

   EA = 1;											// 打开全部中断

   while (1) {                            // 程序等待
	}
}

void PORT_Init(void)
{
	P74OUT=0x03;							//设置P4口为推挽方式
	P4=0x01;								//初始时LED1亮
}

void Timer3_Init (int counts)
{
   TMR3CN = 0x00;                      // 停止定时器3,清除TF3
                                       
   TMR3RL  = -counts;                  // 重新载入初值
   TMR3    = 0xffff;                   // 设置为立即装载
   EIE2   |= 0x01;                     // 打开定时中断3
   TMR3CN |= 0x04;                     // 开始计时
}

void Timer3_ISR (void) interrupt 14
{
   TMR3CN &= ~(0x80);                     // 清除TF3
   P4=P4<<1;                            // 改变LED的状态
   if (P4==0x00)
   {
   		P4=0x01;
   }
}