Revision 11
Fix utils.c
| lab2/timer.c | ||
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| 6 | 6 |
#include "i8254.h" |
| 7 | 7 |
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int (timer_set_frequency)(uint8_t timer, uint32_t freq) {
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// counter_init = clock/feq |
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uint8_t status = 0; |
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if (timer_get_conf(timer, &status)) return 1; |
| 15 | 11 |
//Make command |
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uint8_t write_cmd = 0; |
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//Select timer |
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switch(timer) {
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case 0: write_cmd |= TIMER_SEL0; |
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break; |
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case 1: write_cmd |= TIMER_SEL1; |
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break; |
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case 2: write_cmd |= TIMER_SEL2; |
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break; |
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default: return 1; break; |
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case 0: write_cmd |= TIMER_SEL0; break; |
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case 1: write_cmd |= TIMER_SEL1; break; |
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case 2: write_cmd |= TIMER_SEL2; break; |
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default: return 1; break; |
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} |
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//Change both LSB and MSB |
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write_cmd |= TIMER_LSB_MSB; |
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//Keep 4 least significant bits |
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write_cmd |= (status & (TIMER_MODE_MASK | TIMER_BCD)); |
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//Write cmd |
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sys_outb(TIMER_CTRL, )
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if (sys_outb(TIMER_CTRL, write_cmd)) return 1;
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// counter_init = clock/freq |
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uint16_t counter_init = (uint16_t)(TIMER_FREQ / freq); |
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int timer_port = 0; |
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switch(timer) {
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case 0: read_port = TIMER_0; break; |
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case 1: read_port = TIMER_1; break; |
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case 2: read_port = TIMER_2; break; |
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default: return 1; break; |
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} |
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return 1; |
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} |
| 37 | 42 |
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| lab2/utils.c | ||
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| 11 | 11 |
} |
| 12 | 12 |
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| 13 | 13 |
int(util_get_MSB)(uint16_t val, uint8_t *msb) {
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if (*msb == NULL)
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if (msb == NULL) |
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return 1; |
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*msb = val >> 8; |
| 17 | 17 |
return 0; |
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