今天是第一次写单片机的C程序，单片机开发板是STC12C5A60S2的，参照STC的datasheet，编写了一个定时器的参数设置通用函数，全部源代码如下，烧录到单片机以后，两个定时器都能工作，两个定时器之间的比例也正常，但是每个定时器的时长好像比预期的都长了10倍左右，不知道什么原因，望各位大侠能给予指导和帮助。
#include "reg51.h"
unsigned uCount0 = 100, uCount1 = 200;
sbit P1_0 = P1^0;
sbit P1_3 = P1^3;
unsigned char ucTimer0InitHigh = 0, ucTimer0InitLow = 0;
unsigned char ucTimer1InitHigh = 0, ucTimer1InitLow = 0;
float EnableAndSetTimer( unsigned char ucWhichTimer, float fTimer_us, float fClockFreq_MHz,
unsigned char * pucTimerInitHigh, unsigned char * pucTimerInitLow )
{
float fTimerNum = 0, fRealTimer_us = 0;
unsigned int uTimerNum = 0;
unsigned char * pucAUXR = 0x8e; //address of auxiliary register
unsigned char bIs1TMode = fTimer_us < 65536.0/fClockFreq_MHz ? 1 : 0;
if( bIs1TMode )
{
if( 0 == ucWhichTimer ) * pucAUXR |= 0x80;
else * pucAUXR |= 0x40;
}
else
{
if( 0 == ucWhichTimer ) * pucAUXR &= 0x7f;
else * pucAUXR &= 0xbf;
}
fTimerNum = bIs1TMode? fTimer_us*fClockFreq_MHz : fTimer_us*fClockFreq_MHz/12;
uTimerNum = fTimerNum >= 65536.0? 1 : 65536l-(unsigned)fTimerNum;
fRealTimer_us = fTimerNum >= 65536.0? 65536.0*12/fClockFreq_MHz : fTimer_us;
if( pucTimerInitLow ) * pucTimerInitLow = uTimerNum;
if( pucTimerInitHigh ) * pucTimerInitHigh = uTimerNum >> 8;
if( 0 == ucWhichTimer )
{
TMOD |= 0x01; //set timer0 as mode1 (16-bit)
TL0 = uTimerNum; //initial timer0 low byte
TH0 = uTimerNum >> 8; //initial timer0 high byte
TR0 = 1; //timer0 start running
ET0 = 1; //enable timer0 interrupt
}
else
{
TMOD |= 0x10; //set timer1 as mode1 (16-bit)
TL1 = uTimerNum; //initial timer1 low byte
TH1 = uTimerNum >> 8; //initial timer1 high byte
TR1 = 1; //timer1 start running
ET1 = 1; //enable timer1 interrupt
}
EA = 1; //open global interrupt switch
return fRealTimer_us;
}
void OnTimer0() interrupt 1 using 1
{
TL0 = ucTimer0InitLow; //reload timer0 low byte
TH0 = ucTimer0InitHigh; //reload timer0 high byte
uCount0 --;
if( 0 == uCount0 ) //1ms * 100 -> 0.1s
{
uCount0 = 100; //reset counter
P1_0 = ! P1_0; //work LED flash
}
}
void OnTimer1() interrupt 3 using 1
{
TL1 = ucTimer1InitLow; //reload timer1 low byte
TH1 = ucTimer1InitHigh; //reload timer1 high byte
uCount1 --;
if( 0 == uCount1 )
{
uCount1 = 200; //reset counter
P1_3 = ! P1_3; //work LED flash
}
}
void main()
{
EnableAndSetTimer( 0, 1000, 12.0, & ucTimer0InitHigh, & ucTimer0InitLow );
EnableAndSetTimer( 1, 200, 12.0, & ucTimer1InitHigh, & ucTimer1InitLow );
while (1); //loop
}
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用STC89C52时间就对了
