7u83/stc_rpncalc
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optimize delays for better accuracy

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This commit is contained in:
Jeff Wang
2019-03-21 21:03:35 -04:00
parent 33949440db
commit 606ac5c2f8
3 changed files with 57 additions and 25 deletions
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33
src/main.c
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@ -8,7 +8,7 @@
#include "key.h"
#include "utils.h"
#define FOSC 11059200
#define FOSC 11583000
static const char KEY_MAP[20] = {
@ -46,19 +46,34 @@ void timer0_isr() __interrupt 1 __using 1
INCR_NEW_KEY_I(new_key_write_i);
new_key_empty = 0;
}
//track time
count++;
if (count == 200){
count = 0;
SecCount++;
if (SecCount == 60){
SecCount = 0;
min_count++;
if (min_count == 60){
min_count = 0;
hour_count++;
}
}
}
}
// Call timer0_isr() 10000/sec: 0.0001 sec
// Initialize the timer count so that it overflows after 0.0001 sec
// THTL = 0x10000 - FOSC / 12 / 10000 = 0x10000 - 92.16 = 65444 = 0xFFA4
void Timer0Init(void) //100us @ 11.0592MHz
// Call timer0_isr() 200/sec: 5 ms period
// Initialize the timer count so that it overflows after 0.01 sec
// THTL = 0x10000 - FOSC / 200 = 0x10000 - 115830 = 7621 = 0x1DC5
void Timer0Init(void)
{
// TMOD = 0; // default: 16-bit auto-reload
// AUXR = 0; // default: traditional 8051 timer frequency of FOSC / 12
// TMOD = 0; // default: 16-bit auto-reload
AUXR |= 0x80; // use undivided SYSclk for timer0
// Initial values of TL0 and TH0 are stored in hidden reload registers: RL_TL0 and RL_TH0
TL0 = 0xA4; // Initial timer value
TH0 = 0xFF; // Initial timer value
TL0 = 0xC5; // Initial timer value
TH0 = 0x1D; // Initial timer value
TF0 = 0; // Clear overflow flag
TR0 = 1; // Timer0 start run
ET0 = 1; // Enable timer0 interrupt