root / lab2 / timer.c @ 18
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| 1 | 4 | up20180655 | #include <lcom/lcf.h> |
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| 2 | #include <lcom/timer.h> |
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| 3 | |||
| 4 | #include <stdint.h> |
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| 5 | |||
| 6 | #include "i8254.h" |
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| 7 | |||
| 8 | int (timer_set_frequency)(uint8_t timer, uint32_t freq) {
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| 9 | 18 | up20180655 | |
| 10 | // Frequencies out this range are not supported (by limitation of hardware)
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| 11 | if (freq > TIMER_FREQ || freq < TIMER_MIN_FREQ) return 1; |
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| 12 | |||
| 13 | 10 | up20180655 | uint8_t status = 0;
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| 14 | if (timer_get_conf(timer, &status)) return 1; |
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| 15 | //Make command
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| 16 | uint8_t write_cmd = 0;
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| 17 | //Select timer
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| 18 | switch(timer) {
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| 19 | 11 | up20180655 | case 0: write_cmd |= TIMER_SEL0; break; |
| 20 | case 1: write_cmd |= TIMER_SEL1; break; |
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| 21 | case 2: write_cmd |= TIMER_SEL2; break; |
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| 22 | default: return 1; break; |
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| 23 | 10 | up20180655 | } |
| 24 | //Change both LSB and MSB
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| 25 | write_cmd |= TIMER_LSB_MSB; |
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| 26 | //Keep 4 least significant bits
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| 27 | write_cmd |= (status & (TIMER_MODE_MASK | TIMER_BCD)); |
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| 28 | //Write cmd
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| 29 | 11 | up20180655 | if (sys_outb(TIMER_CTRL, write_cmd)) return 1; |
| 30 | 10 | up20180655 | |
| 31 | 11 | up20180655 | // counter_init = clock/freq
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| 32 | 15 | up20180655 | uint16_t counter_init = (uint16_t)(TIMER_FREQ / freq); |
| 33 | 10 | up20180655 | |
| 34 | 11 | up20180655 | int timer_port = 0; |
| 35 | switch(timer) {
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| 36 | 12 | up20180655 | case 0: timer_port = TIMER_0; break; |
| 37 | case 1: timer_port = TIMER_1; break; |
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| 38 | case 2: timer_port = TIMER_2; break; |
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| 39 | 15 | up20180655 | default: return 1; break; |
| 40 | 11 | up20180655 | } |
| 41 | 15 | up20180655 | uint8_t lsb = 0, msb = 0; |
| 42 | if (util_get_LSB(counter_init, &lsb)) return 1; |
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| 43 | if (util_get_MSB(counter_init, &msb)) return 1; |
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| 44 | 11 | up20180655 | |
| 45 | 15 | up20180655 | if (sys_outb(timer_port, lsb)) return 1; |
| 46 | if (sys_outb(timer_port, msb)) return 1; |
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| 47 | 11 | up20180655 | |
| 48 | 15 | up20180655 | return 0; |
| 49 | 4 | up20180655 | } |
| 50 | |||
| 51 | int (timer_subscribe_int)(uint8_t *bit_no) {
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| 52 | /* To be implemented by the students */
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| 53 | 5 | up20180642 | printf("%s is not yet implemented!\n", __func__);
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| 54 | 4 | up20180655 | |
| 55 | 5 | up20180642 | return 1; |
| 56 | 4 | up20180655 | } |
| 57 | |||
| 58 | int (timer_unsubscribe_int)() {
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| 59 | 5 | up20180642 | /* To be implemented by the students */
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| 60 | printf("%s is not yet implemented!\n", __func__);
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| 61 | 4 | up20180655 | |
| 62 | 5 | up20180642 | return 1; |
| 63 | 4 | up20180655 | } |
| 64 | |||
| 65 | void (timer_int_handler)() {
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| 66 | 5 | up20180642 | /* To be implemented by the students */
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| 67 | printf("%s is not yet implemented!\n", __func__);
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| 68 | 4 | up20180655 | } |
| 69 | |||
| 70 | int (timer_get_conf)(uint8_t timer, uint8_t *st) {
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| 71 | 9 | up20180642 | // Write read-back command to TIMER_CTRL
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| 72 | 5 | up20180642 | u32_t cmd = TIMER_RB_CMD | TIMER_RB_COUNT_ | TIMER_RB_SEL(timer); |
| 73 | 10 | up20180655 | if(sys_outb(TIMER_CTRL, cmd)) return 1; |
| 74 | 4 | up20180655 | |
| 75 | 5 | up20180642 | int read_port;
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| 76 | 7 | up20180655 | switch(timer) {
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| 77 | 5 | up20180642 | case 0: read_port = TIMER_0; break; |
| 78 | case 1: read_port = TIMER_1; break; |
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| 79 | case 2: read_port = TIMER_2; break; |
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| 80 | 6 | up20180642 | default: return 1; break; |
| 81 | 5 | up20180642 | } |
| 82 | if(util_sys_inb(read_port, st)) return 1; |
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| 83 | return 0; |
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| 84 | 4 | up20180655 | } |
| 85 | |||
| 86 | 6 | up20180642 | int (timer_display_conf)(uint8_t timer, uint8_t st, enum timer_status_field field) { |
| 87 | union timer_status_field_val conf;
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| 88 | uint8_t in_mode; |
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| 89 | 16 | up20180642 | switch(field){
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| 90 | case tsf_all:
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| 91 | conf.byte = st; |
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| 92 | break;
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| 93 | case tsf_initial:
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| 94 | in_mode = (st & TIMER_INMODE_MASK) >> TIMER_INMODE_POS; |
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| 95 | switch(in_mode){
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| 96 | case 0: conf.in_mode = INVAL_val ; break; //000 |
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| 97 | case 1: conf.in_mode = LSB_only ; break; //001 |
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| 98 | case 2: conf.in_mode = MSB_only ; break; //010 |
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| 99 | case 3: conf.in_mode = MSB_after_LSB; break; //011 |
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| 100 | default: return 1; break; |
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| 101 | } |
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| 102 | break;
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| 103 | case tsf_mode:
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| 104 | conf.count_mode = (st & TIMER_MODE_MASK)>>TIMER_MODE_POS; |
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| 105 | 17 | up20180642 | if(conf.count_mode == TIMER_MODE_2ALT || conf.count_mode == TIMER_MODE_3ALT)
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| 106 | 16 | up20180642 | conf.count_mode &= TIMER_MODE_RED2; |
| 107 | break;
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| 108 | case tsf_base:
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| 109 | conf.bcd = st & TIMER_BCD; |
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| 110 | break;
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| 111 | default: return 1; break; |
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| 112 | 5 | up20180642 | } |
| 113 | 16 | up20180642 | if(timer_print_config(timer, field, conf)) return 1; |
| 114 | 6 | up20180642 | return 0; |
| 115 | } |