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设定多个定时器

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Yourtion
2016-04-18 14:30:57 +08:00
parent b50c16d8e0
commit 9e1c17b4d1
3 changed files with 90 additions and 26 deletions
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63
12_day/timer.c
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@@ -4,40 +4,69 @@
#define PIT_CTRL 0x0043
#define PIT_CNT0 0x0040
#define TIMER_FLAGS_ALLOC 1 /* 已配置状态 */
#define TIMER_FLAGS_USING 2 /* 定时器运行中 */
struct TIMERCTL timerctl;
void init_pit(void)
{
int i;
io_out8(PIT_CTRL, 0x34);
io_out8(PIT_CNT0, 0x9c);
io_out8(PIT_CNT0, 0x2e);
timerctl.count = 0;
timerctl.timeout = 0;
for (i = 0; i < MAX_TIMER; i++) {
timerctl.timer[i].flags = 0; /* 未使用 */
}
return;
}
struct TIMER *timer_alloc(void)
{
int i;
for (i = 0; i < MAX_TIMER; i++) {
if (timerctl.timer[i].flags == 0) {
timerctl.timer[i].flags = TIMER_FLAGS_ALLOC;
return &timerctl.timer[i];
}
}
return 0; /* 没找到 */
}
void timer_free(struct TIMER *timer)
{
timer->flags = 0; /* 未使用 */
return;
}
void timer_init(struct TIMER *timer, struct FIFO8 *fifo, unsigned char data)
{
timer->fifo = fifo;
timer->data = data;
return;
}
void timer_settime(struct TIMER *timer, unsigned int timeout)
{
timer->timeout = timeout;
timer->flags = TIMER_FLAGS_USING;
return;
}
void inthandler20(int *esp)
{
int i;
io_out8(PIC0_OCW2, 0x60); /* 把IRQ-00信号接收完了的信息通知给PIC */
timerctl.count++;
if (timerctl.timeout > 0) { /* 如果已经设定了超时 */
timerctl.timeout--;
if (timerctl.timeout == 0) {
fifo8_put(timerctl.fifo, timerctl.data);
for (i = 0; i < MAX_TIMER; i++) {
if (timerctl.timer[i].flags == TIMER_FLAGS_USING) {
timerctl.timer[i].timeout--;
if (timerctl.timer[i].timeout == 0) {
timerctl.timer[i].flags = TIMER_FLAGS_ALLOC;
fifo8_put(timerctl.timer[i].fifo, timerctl.timer[i].data);
}
}
}
return;
}
void settimer(unsigned int timeout, struct FIFO8 *fifo, unsigned char data)
{
int eflags;
eflags = io_load_eflags();
io_cli();
timerctl.timeout = timeout;
timerctl.fifo = fifo;
timerctl.data = data;
io_store_eflags(eflags);
return;
}