Revision 29
minor changes and comments
| lab2/lab2.c | ||
|---|---|---|
| 37 | 37 |
|
| 38 | 38 |
int(timer_test_time_base)(uint8_t timer, uint32_t freq) {
|
| 39 | 39 |
if (timer_set_frequency(timer, freq)) return 1; |
| 40 |
return 0; |
|
| 40 |
return 0;
|
|
| 41 | 41 |
} |
| 42 | 42 |
|
| 43 | 43 |
extern int no_interrupts; |
| 44 | 44 |
|
| 45 | 45 |
int(timer_test_int)(uint8_t time) {
|
| 46 |
const uint32_t frequency = 60; // Frequency asummed at 60Hz
|
|
| 46 |
const int frequency = 60; // Frequency asummed at 60Hz
|
|
| 47 | 47 |
int ipc_status, r; |
| 48 | 48 |
message msg; |
| 49 | 49 |
uint8_t hook = 0; |
| 50 | 50 |
no_interrupts = 0; |
| 51 |
timer_subscribe_int(&hook);
|
|
| 51 |
if (timer_subscribe_int(&hook)) return 1;
|
|
| 52 | 52 |
int irq_set = BIT(hook); |
| 53 | 53 |
while (time) {
|
| 54 | 54 |
/* Get a request message. */ |
| ... | ... | |
| 61 | 61 |
case HARDWARE: /* hardware interrupt notification */ |
| 62 | 62 |
if (msg.m_notify.interrupts & irq_set) { /* subscribed interrupt */
|
| 63 | 63 |
timer_int_handler(); |
| 64 |
if (!(no_interrupts % frequency)) {
|
|
| 64 |
if (!(no_interrupts % frequency)) { /* second elapsed */
|
|
| 65 | 65 |
timer_print_elapsed_time(); |
| 66 | 66 |
time--; |
| 67 | 67 |
} |
| ... | ... | |
| 74 | 74 |
/* no standart message expected: do nothing */ |
| 75 | 75 |
} |
| 76 | 76 |
} |
| 77 |
timer_unsubscribe_int();
|
|
| 78 |
return 0; |
|
| 77 |
if (timer_unsubscribe_int()) return 1;
|
|
| 78 |
return 0;
|
|
| 79 | 79 |
} |
| lab2/timer.c | ||
|---|---|---|
| 22 | 22 |
case 0: write_cmd |= TIMER_SEL0; break; |
| 23 | 23 |
case 1: write_cmd |= TIMER_SEL1; break; |
| 24 | 24 |
case 2: write_cmd |= TIMER_SEL2; break; |
| 25 |
default: return 1; break;
|
|
| 25 |
default: return 1; |
|
| 26 | 26 |
} |
| 27 | 27 |
//Change both LSB and MSB |
| 28 | 28 |
write_cmd |= TIMER_LSB_MSB; |
| ... | ... | |
| 39 | 39 |
case 0: timer_port = TIMER_0; break; |
| 40 | 40 |
case 1: timer_port = TIMER_1; break; |
| 41 | 41 |
case 2: timer_port = TIMER_2; break; |
| 42 |
default: return 1; break;
|
|
| 42 |
default: return 1; |
|
| 43 | 43 |
} |
| 44 | 44 |
uint8_t lsb = 0, msb = 0; |
| 45 |
/* Split the 16 bits word in two bytes */ |
|
| 45 | 46 |
if (util_get_LSB(counter_init, &lsb)) return 1; |
| 46 | 47 |
if (util_get_MSB(counter_init, &msb)) return 1; |
| 47 | 48 |
|
| 49 |
/* Write the 8 LSB of the counter */ |
|
| 48 | 50 |
if (sys_outb(timer_port, lsb)) return 1; |
| 51 |
/* Write the 8 MSB of the counter */ |
|
| 49 | 52 |
if (sys_outb(timer_port, msb)) return 1; |
| 50 | 53 |
|
| 51 | 54 |
return 0; |
| ... | ... | |
| 54 | 57 |
int hook_id; |
| 55 | 58 |
|
| 56 | 59 |
int (timer_subscribe_int)(uint8_t *bit_no) {
|
| 60 |
if(bit_no == NULL) return 1; |
|
| 57 | 61 |
hook_id = 2; |
| 58 |
if(bit_no == NULL) return 1; |
|
| 59 | 62 |
*bit_no = hook_id; |
| 63 |
/* Subscribe Timer 0 Interrupts */ |
|
| 60 | 64 |
return sys_irqsetpolicy(TIMER0_IRQ, IRQ_REENABLE, &hook_id); |
| 61 | 65 |
} |
| 62 | 66 |
|
| 63 | 67 |
int (timer_unsubscribe_int)() {
|
| 68 |
/* Unsubscribe Timer 0 Interrupts */ |
|
| 64 | 69 |
if(sys_irqrmpolicy(&hook_id)) return 1; |
| 65 | 70 |
return 0; |
| 66 | 71 |
} |
| ... | ... | |
| 80 | 85 |
case 0: read_port = TIMER_0; break; |
| 81 | 86 |
case 1: read_port = TIMER_1; break; |
| 82 | 87 |
case 2: read_port = TIMER_2; break; |
| 83 |
default: return 1; break;
|
|
| 88 |
default: return 1; |
|
| 84 | 89 |
} |
| 85 | 90 |
if(util_sys_inb(read_port, st)) return 1; |
| 86 | 91 |
return 0; |
| ... | ... | |
| 91 | 96 |
uint8_t in_mode; |
| 92 | 97 |
switch(field){
|
| 93 | 98 |
case tsf_all: |
| 94 |
conf.byte = st; |
|
| 99 |
conf.byte = st; /* Full Status Byte */
|
|
| 95 | 100 |
break; |
| 96 | 101 |
case tsf_initial: |
| 102 |
/* Counter Initial Value Loading Mode */ |
|
| 97 | 103 |
in_mode = (st & TIMER_INMODE_MASK) >> TIMER_INMODE_POS; |
| 98 | 104 |
switch(in_mode){
|
| 99 | 105 |
case 0: conf.in_mode = INVAL_val ; break; //000 |
| 100 | 106 |
case 1: conf.in_mode = LSB_only ; break; //001 |
| 101 | 107 |
case 2: conf.in_mode = MSB_only ; break; //010 |
| 102 | 108 |
case 3: conf.in_mode = MSB_after_LSB; break; //011 |
| 103 |
default: return 1; break;
|
|
| 109 |
default: return 1; |
|
| 104 | 110 |
} |
| 105 | 111 |
break; |
| 106 | 112 |
case tsf_mode: |
| 113 |
/* Counting Mode */ |
|
| 107 | 114 |
conf.count_mode = (st & TIMER_MODE_MASK)>>TIMER_MODE_POS; |
| 108 | 115 |
if(conf.count_mode == TIMER_MODE_2ALT || conf.count_mode == TIMER_MODE_3ALT) |
| 109 | 116 |
conf.count_mode &= TIMER_MODE_RED2; |
| 110 | 117 |
break; |
| 111 | 118 |
case tsf_base: |
| 119 |
/* Representation of Counter Initial Value */ |
|
| 112 | 120 |
conf.bcd = st & TIMER_BCD; |
| 113 | 121 |
break; |
| 114 |
default: return 1; break;
|
|
| 122 |
default: return 1; |
|
| 115 | 123 |
} |
| 116 | 124 |
if(timer_print_config(timer, field, conf)) return 1; |
| 117 | 125 |
return 0; |
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