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i8255.c
101 lines (78 loc) · 1.82 KB
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i8255.c
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#include <i8255.h>
#include <hal.h>
#include <io.h>
#include <pic.h>
#include <libc.h>
#include <keyboard.h>
#include <math.h>
#include <timer.h>
CREATE_ISR_DISPATCHER(i8255);
void i8255_wait_ibs() {
while(inb(0x64) & KBD_STAT_IBF); // spin
}
void i8255_write_ccommand(u_int8_t cmd) {
i8255_wait_ibs();
outb_p(cmd, 0x64);
}
void i8255_write_command(u_int8_t cmd) {
i8255_wait_ibs();
outb_p(cmd, 0x60);
}
void i8255_write_data(u_int8_t cmd) {
i8255_wait_ibs();
outb_p(cmd, 0x60);
}
void i8255_set_mode(u_int8_t val) {
i8255_write_ccommand(KBDC_CMD_WRITE_MODE);
outb_p(val, 0x60);
}
u_int8_t i8255_get_mode() {
i8255_write_ccommand(KBDC_CMD_READ_MODE);
i8255_wait_ibs();
return inb(0x60);
}
/*********************/
void i8255_init() {
set_isr(0x21, i8255_isr);
i8255_write_command(KBD_CMD_SELECT_SCANCODE);
i8255_write_data(2);
}
void i8255_cisr() {
keyboard_isr(inb(0x60));
pic_ack(1);
}
void i8255_set_led(int mask) {
i8255_write_command(KBD_CMD_SET_LED);
i8255_write_data(mask);
}
void i8255_enable_speaker(int on) {
u_int8_t portb;
disable_irq(1);
portb = inb(0x61);
if(on)
outb_p(portb | 0x3, 0x61);
else
outb_p(portb & ~0x3, 0x61);
enable_irq(1);
}
void i8255_set_freq(int freq) {
u_int16_t latch = 1193180/freq;
irql_t saved_irql = hal_irql_set(IRQL_INTERRUPT);
outb_p(0xb6, 0x43); // timer2, latch, square, binary
outb_p(latch & 0xFF, 0x42);
outb_p(latch >> 8, 0x42);
hal_irql_restore(saved_irql);
}
void i8255_play(int freq, int duration) {
i8255_set_freq(freq);
i8255_enable_speaker(1);
delay(duration);
i8255_enable_speaker(0);
}
void i8255_aux_write(u_int8_t val) {
irql_t saved_irql = hal_irql_set(IRQL_INTERRUPT);
i8255_write_ccommand(KBDC_CMD_WRITE_MOUSE);
i8255_write_data(val);
// i8255_wait_ibs();
hal_irql_restore(saved_irql);
}