timer.c

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#include <reg52.h>#include "utilities.h"#define TMR0#define TMR0_MOD1//#define TMR0_MOD2//#define TMR1//#define TMR1_MOD1//#define TMR1_MOD2#if defined (TMR0)#if defined (TMR0_MOD1)uchar T0RH = 0;uchar T0RL = 0;void setTmr0Mod1(uint ms) {    ulong tmp;    TMOD &= 0xF0;    TMOD |= 0x01;    tmp = 11059200 / 12;    tmp = tmp * ms / 1000;    tmp = 65536 - tmp;    tmp += 28;    T0RL = tmp;    T0RH = tmp >> 8;}#elif defined (TMR0_MOD2)void setTmr0Mod2(uint us) {    //微秒，最多定时277微秒    ulong tmp;    TMOD &= 0xF0;    TMOD |= 0x02;    tmp = us * 11059200 / 12000000;     //不会超过unsigned int    tmp = 256 - tmp;    TL0 = tmp;    TH0 = tmp;}#endif // defined#endif // defined#if defined (TMR1)#if defined (TMR1_MOD1)uchar T1RH = 0;uchar T1RL = 0;void setTmr1Mod1(uint ms) {    ulong tmp;    tmp = 11059200 / 12;    tmp = tmp * ms / 1000;    tmp = 65536 - tmp;    tmp += 28;    T1RL = tmp;    T1RH = tmp >> 8;}#elif defined (TMR1_MOD2)void setTmr1Mod2(uint us) {     //微秒，最多定时277微秒    ulong tmp;    TMOD &= 0x0F;    TMOD |= 0x20;    tmp = us * 11059200 / 12000000;     //不会超过unsigned int    tmp = 256 - tmp;    TL1 = tmp;    TH1 = tmp;}#endif // defined#endif // defined
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