root / lab2 / timer.c @ 10
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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 | |||
| 10 | 10 | up20180655 | // counter_init = clock/feq
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| 11 | |||
| 12 | uint8_t status = 0;
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| 13 | |||
| 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 | case 0: write_cmd |= TIMER_SEL0; |
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| 20 | break;
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| 21 | case 1: write_cmd |= TIMER_SEL1; |
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| 22 | break;
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| 23 | case 2: write_cmd |= TIMER_SEL2; |
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| 24 | break;
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| 25 | default: return 1; break; |
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| 26 | } |
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| 27 | //Change both LSB and MSB
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| 28 | write_cmd |= TIMER_LSB_MSB; |
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| 29 | //Keep 4 least significant bits
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| 30 | write_cmd |= (status & (TIMER_MODE_MASK | TIMER_BCD)); |
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| 31 | //Write cmd
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| 32 | sys_outb(TIMER_CTRL, ) |
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| 33 | |||
| 34 | |||
| 35 | 5 | up20180642 | return 1; |
| 36 | 4 | up20180655 | } |
| 37 | |||
| 38 | int (timer_subscribe_int)(uint8_t *bit_no) {
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| 39 | /* To be implemented by the students */
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| 40 | 5 | up20180642 | printf("%s is not yet implemented!\n", __func__);
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| 41 | 4 | up20180655 | |
| 42 | 5 | up20180642 | return 1; |
| 43 | 4 | up20180655 | } |
| 44 | |||
| 45 | int (timer_unsubscribe_int)() {
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| 46 | 5 | up20180642 | /* To be implemented by the students */
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| 47 | printf("%s is not yet implemented!\n", __func__);
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| 48 | 4 | up20180655 | |
| 49 | 5 | up20180642 | return 1; |
| 50 | 4 | up20180655 | } |
| 51 | |||
| 52 | void (timer_int_handler)() {
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| 53 | 5 | up20180642 | /* To be implemented by the students */
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| 54 | printf("%s is not yet implemented!\n", __func__);
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| 55 | 4 | up20180655 | } |
| 56 | |||
| 57 | int (timer_get_conf)(uint8_t timer, uint8_t *st) {
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| 58 | 9 | up20180642 | // Write read-back command to TIMER_CTRL
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| 59 | 5 | up20180642 | u32_t cmd = TIMER_RB_CMD | TIMER_RB_COUNT_ | TIMER_RB_SEL(timer); |
| 60 | 10 | up20180655 | if(sys_outb(TIMER_CTRL, cmd)) return 1; |
| 61 | 4 | up20180655 | |
| 62 | 5 | up20180642 | int read_port;
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| 63 | 7 | up20180655 | switch(timer) {
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| 64 | 5 | up20180642 | case 0: read_port = TIMER_0; break; |
| 65 | case 1: read_port = TIMER_1; break; |
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| 66 | case 2: read_port = TIMER_2; break; |
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| 67 | 6 | up20180642 | default: return 1; break; |
| 68 | 5 | up20180642 | } |
| 69 | if(util_sys_inb(read_port, st)) return 1; |
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| 70 | return 0; |
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| 71 | 4 | up20180655 | } |
| 72 | |||
| 73 | 6 | up20180642 | int (timer_display_conf)(uint8_t timer, uint8_t st, enum timer_status_field field) { |
| 74 | union timer_status_field_val conf;
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| 75 | uint8_t in_mode; |
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| 76 | if(field == tsf_all || field == tsf_initial){
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| 77 | in_mode = (st & TIMER_INMODE_MASK) >> TIMER_INMODE_POS; |
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| 78 | switch(in_mode){
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| 79 | 9 | up20180642 | case 0: conf.in_mode = INVAL_val ; break; //000 |
| 80 | case 1: conf.in_mode = LSB_only ; break; //001 |
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| 81 | case 2: conf.in_mode = MSB_only ; break; //010 |
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| 82 | case 3: conf.in_mode = MSB_after_LSB; break; //011 |
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| 83 | 6 | up20180642 | default: return 1; break; |
| 84 | } |
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| 85 | if(timer_print_config(timer, field, conf)) return 1; |
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| 86 | 5 | up20180642 | } |
| 87 | 8 | up20180642 | if(field == tsf_mode){
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| 88 | 6 | up20180642 | conf.count_mode = (st & TIMER_MODE_MASK)>>TIMER_MODE_POS; |
| 89 | if(timer_print_config(timer, field, conf)) return 1; |
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| 90 | } |
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| 91 | 8 | up20180642 | if(field == tsf_base){
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| 92 | 6 | up20180642 | conf.bcd = st & TIMER_BCD; |
| 93 | if(timer_print_config(timer, field, conf)) return 1; |
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| 94 | } |
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| 95 | return 0; |
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| 96 | } |