79 lines
1.0 KiB
C
79 lines
1.0 KiB
C
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#include <8052.h>
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#ifndef FLASH_PIN
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#define FLASH_PIN _P2_0
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#endif
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#ifndef IRQFREQ
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#define IRQFREQ 1000L
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#endif
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#ifndef T0_BITS
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#define T0_BITS 13
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#endif
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#define FOSC (SYSCLK*1000L)
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#define T0_1MS ((65536)-FOSC/12L/IRQFREQ)
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#define TCT IRQFREQ/2-1
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unsigned char ctr_l = TCT&0xFF;
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unsigned char ctr_h = (TCT>>8)&0xff;
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unsigned char ctr_w = (TCT>>16)&0xff;
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unsigned char counter = 0;
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void handler() __interrupt 1
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{
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EA=0;
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TL0 = (T0_1MS) & 0xFF; // Initial timer value
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TH0 = T0_1MS>>8; // Initial timer value
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__asm
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mov a, #0xff
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dec _ctr_l
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cjne a,_ctr_l, 00001$
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dec _ctr_h
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cjne a,_ctr_h, 00001$
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dec _ctr_w
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cjne a,_ctr_w, 00001$
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; cpl FLASH_PIN
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__endasm;
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counter ++;
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P2 = counter ^0xff;
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ctr_l = TCT&0xFF;
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ctr_h = (TCT>>8)&0xff;
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ctr_w = (TCT>>16)&0xff;
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__asm
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00001$:
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__endasm;
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EA=1;
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}
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void main()
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{
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P1=TMOD;
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EA=0;
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TMOD =1;
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P1=TMOD;
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TL0 = (T0_1MS) & 0xFF; // Initial timer value
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TH0 = T0_1MS>>8; // Initial timer value
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TR0 = 1; // Timer0 start run
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ET0 = 1; // Enable timer0 interrupt
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EA=1;
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while(1);
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}
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