diff options
Diffstat (limited to 'include/07.pit/timer.c')
| -rw-r--r-- | include/07.pit/timer.c | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/include/07.pit/timer.c b/include/07.pit/timer.c index 390e512..3a8f159 100644 --- a/include/07.pit/timer.c +++ b/include/07.pit/timer.c @@ -1,20 +1,18 @@ +#include<source/timer.h> #include<types.h> #include<asm.h> -#include<stdio.h> - -void add_idt_entry(size_t num,uint32_t offset); +#include<source/stdio.h> uint32_t tick=0; const uint32_t TICKS_PER_SECOND=50; extern uint32_t time; uint32_t time=0; -void timer_handler() +void timer_handler(void) { tick++; if(tick==TICKS_PER_SECOND) { - //printf("%d seconds passed\n",time); tick=0; time++; } @@ -25,21 +23,12 @@ void timer_handler() void init_timer(uint32_t frequency) { - // Firstly, register our timer callback. - - // The value we send to the PIT is the value to divide it's input clock - // (1193180 Hz) by, to get our required frequency. Important to note is - // that the divisor must be small enough to fit into 16-bits. uint32_t divisor = 1193180 / frequency; - - // Send the command byte. ioport_out(0x43, 0x36); - // Divisor has to be sent byte-wise, so split here into upper/lower bytes. uint8_t l = (uint8_t)(divisor & 0xFF); uint8_t h = (uint8_t)( (divisor>>8) & 0xFF ); - // Send the frequency divisor. ioport_out(0x40, l); ioport_out(0x40, h); } |