68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
#include "types.h"
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#include "cpu.h"
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#include "timers.h"
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#define TIMER1_EXTRA 0x1
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#define TIMER1_INT 0x2
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#define TIMER1_WAKE 0x4
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#define TIMER1_SRQ 0x8
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#define TIMER_RUN 0x1
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#define TIMER2_INT 0x2
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#define TIMER2_WAKE 0x4
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#define TIMER2_SRQ 0x8
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byte timer1_control;
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byte timer2_control;
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byte timer1_value;
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dword timer2_value;
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void timer1_update( void )
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{
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if ( !( timer2_control & TIMER_RUN ) )
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return;
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timer1_value--;
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timer1_value &= 0xF;
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if ( timer1_value & 0x8 ) {
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if ( timer1_control & TIMER1_WAKE ) {
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timer1_control |= TIMER1_SRQ;
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if ( cpu.shutdown ) {
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cpu.shutdown = false;
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timer1_control &= ~TIMER1_WAKE;
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}
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}
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if ( timer1_control & TIMER1_INT ) {
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timer1_control |= TIMER1_SRQ;
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if ( !cpu.shutdown )
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cpu_interrupt();
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}
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} else
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timer1_control &= ~TIMER1_SRQ;
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}
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void timer2_update( void )
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{
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if ( !( timer2_control & TIMER_RUN ) )
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return;
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timer2_value--;
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if ( timer2_value & 0x80000000 ) {
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if ( timer2_control & TIMER2_WAKE ) {
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timer2_control |= TIMER2_SRQ;
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if ( cpu.shutdown ) {
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cpu.shutdown = 0;
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timer2_control &= ~TIMER2_WAKE;
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}
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}
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if ( timer2_control & TIMER2_INT ) {
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timer2_control |= TIMER2_SRQ;
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if ( !cpu.shutdown )
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cpu_interrupt();
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}
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} else
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timer2_control &= ~TIMER2_SRQ;
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}
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