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发表于 2024-12-26 09:53:44
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擎天柱 第七集 定时器中断
#include "AI8051U.h"
#include "AI_usb.h"
#include "intrins.h"
#define u8 unsigned char
#define u16 unsigned int
u8 state=0;
u8 Run_State=0; //运行状态
char *USER_DEVICEDESC = NULL;
char *USER_PRODUCTDESC = NULL;
char *USER_STCISPCMD = "@STCISP#";
void Delay20ms(void) //@24.000MHz Delay20ms();
{
unsigned long edata i;
_nop_();
_nop_();
i = 119998UL;
while (i) i--;
}
void Timer0_Init(void); //3秒@24.000MHz //函数声明
void main(void)
{
int count=1; //按键计数变量
WTST = 0; //设置程序指令延时参数,赋值为0可将CPU执行指令的速度设置为最快
EAXFR = 1; //扩展寄存器(XFR)访问使能
CKCON = 0; //提高访问XRAM速度
P0M1 = 0x00; P0M0 = 0x00;
P1M1 = 0x00; P1M0 = 0x00;
P2M1 = 0x00; P2M0 = 0x00;
P3M1 = 0x00; P3M0 = 0x00;
P4M1 = 0x00; P4M0 = 0x00;
P5M1 = 0x00; P5M0 = 0x00;
P6M1 = 0x00; P6M0 = 0x00;
P7M1 = 0x00; P7M0 = 0x00;
usb_init();
IE2 |= 0x80;
EA = 1;
P40 = 0;
while (DeviceState != DEVSTATE_CONFIGURED);
while(1)
{
if (bUsbOutReady)
{
//USB_SendData(UsbOutBuffer,OutNumber); //发送数据缓冲区,长度(接收数据原样返回, 用于测试)
usb_OUT_done(); //
}
if( P32 == 0 )
{
Delay20ms(); //延时20ms消抖
if( P32 == 0 )
{
P20 = 0;
Timer0_Init();
while( P32 == 0 );
}
}
//
//任务:救护车灯控制器
if( P32 == 0 )
{
Delay20ms(); //延时20ms消抖
if( P32 == 0 )
{
Run_State = !Run_State; //运行状态取反
if( Run_State==1 )
{
Timer0_Init();
}
else
{
TR0 = 0;
P20 = 1;
P21 = 1;
}
while( P32 == 0 );
}
}
}
}
void Timer0_Init(void) //500毫秒@24.000MHz
{
TM0PS = 0x0F; //设置定时器时钟预分频 ( 注意:并非所有系列都有此寄存器,详情请查看数据手册 )
AUXR &= 0x7F; //定时器时钟12T模式
TMOD &= 0xF0; //设置定时器模式
TL0 = 0xDC; //设置定时初始值
TH0 = 0x0B; //设置定时初始值
TF0 = 0; //清除TF0标志
TR0 = 1; //定时器0开始计时
ET0 = 1; //使能定时器0中断
}
void Timer0_Isr(void) interrupt 1 //3秒执行一次
{
state = !state;
P20 = state;
P21 = !state;
}
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