63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
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//
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// STC15 RPN calculator
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//
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#include "stc15.h"
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#include <stdint.h>
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#include "lcd.h"
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#include "utils.h"
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#define FOSC 11059200
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// clear wdt
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#define WDT_CLEAR() (WDT_CONTR |= 1 << 4)
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void timer0_isr() __interrupt 1 __using 1
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{
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P3_1 ^= 1;
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}
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// Call timer0_isr() 10000/sec: 0.0001 sec
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// Initialize the timer count so that it overflows after 0.0001 sec
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// THTL = 0x10000 - FOSC / 12 / 10000 = 0x10000 - 92.16 = 65444 = 0xFFA4
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void Timer0Init(void) //100us @ 11.0592MHz
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{
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// TMOD = 0; // default: 16-bit auto-reload
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// AUXR = 0; // default: traditional 8051 timer frequency of FOSC / 12
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// Initial values of TL0 and TH0 are stored in hidden reload registers: RL_TL0 and RL_TH0
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TL0 = 0xA4; // Initial timer value
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TH0 = 0xFF; // Initial timer value
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TF0 = 0; // Clear overflow flag
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TR0 = 1; // Timer0 start run
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ET0 = 1; // Enable timer0 interrupt
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EA = 1; // Enable global interrupt
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}
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char buf[17];
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/*********************************************/
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int main()
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{
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uint32_t i;
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Timer0Init(); // display refresh & switch read
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LCD_Open();
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P3_4 = 0; //turn on led backlight
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LCD_OutString("Hello world !!!!");
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LCD_GoTo(1,0);
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LCD_OutString(".......");
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i = 0;
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// LOOP
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while (1)
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{
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LCD_GoTo(1,7);
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LCD_OutString(u32str(i, buf, 10));
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i++;
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WDT_CLEAR();
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}
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}
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/* ------------------------------------------------------------------------- */
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