root / lab2 / timer.c @ 4
History | View | Annotate | Download (6 KB)
| 1 |
#include <lcom/lcf.h> |
|---|---|
| 2 |
#include <lcom/timer.h> |
| 3 |
|
| 4 |
#include <stdint.h> |
| 5 |
|
| 6 |
#include "i8254.h" |
| 7 |
|
| 8 |
unsigned int count=0; //Initializing counter |
| 9 |
int hook_id = TIMER0_IRQ;
|
| 10 |
|
| 11 |
int (timer_set_frequency)(uint8_t timer, uint32_t freq) {
|
| 12 |
// freq=TIMER_FREQ/div, where TIMER_FREQ is the frequency of the clock and div os the value loaded nittially in the timer
|
| 13 |
uint16_t div = (TIMER_FREQ /freq); |
| 14 |
|
| 15 |
uint8_t msb, lsb; |
| 16 |
|
| 17 |
util_get_LSB(div,&lsb); //getting LSB
|
| 18 |
util_get_MSB(div,&msb); //getting MSB
|
| 19 |
|
| 20 |
uint8_t st; |
| 21 |
|
| 22 |
if(timer_get_conf(timer,&st)!=0){ |
| 23 |
printf("Error getting conf in frequency set\n");
|
| 24 |
return 1; |
| 25 |
} |
| 26 |
if(timer<0|timer>2){ |
| 27 |
printf("Error selecting timer in frequency set\n");
|
| 28 |
return 1; |
| 29 |
} |
| 30 |
else
|
| 31 |
{
|
| 32 |
if(timer==0){ |
| 33 |
st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL0); //The mask 0x0f is used so that the 4 LSBs are not changed |
| 34 |
sys_outb(TIMER_CTRL,st); //Sends control word to program the timer
|
| 35 |
sys_outb(TIMER_0,lsb); |
| 36 |
sys_outb(TIMER_0,msb); //Both these functions program the timer
|
| 37 |
} |
| 38 |
else if(timer==1){ |
| 39 |
st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL1);
|
| 40 |
sys_outb(TIMER_CTRL,st); |
| 41 |
sys_outb(TIMER_1,lsb); |
| 42 |
sys_outb(TIMER_1,msb); |
| 43 |
} |
| 44 |
else if(timer==2){ |
| 45 |
st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL2);
|
| 46 |
sys_outb(TIMER_CTRL,st); |
| 47 |
sys_outb(TIMER_2,lsb); |
| 48 |
sys_outb(TIMER_2,msb); |
| 49 |
} |
| 50 |
} |
| 51 |
return 0; |
| 52 |
} |
| 53 |
|
| 54 |
int (timer_subscribe_int)(uint8_t *bit_no) {
|
| 55 |
*bit_no = BIT(hook_id); |
| 56 |
if(sys_irqsetpolicy(TIMER0_IRQ,IRQ_REENABLE,&hook_id)==1){ //operation to subscribe int |
| 57 |
printf("Error subscribing int\n");
|
| 58 |
return 1; |
| 59 |
} |
| 60 |
return 0; |
| 61 |
} |
| 62 |
|
| 63 |
int (timer_unsubscribe_int)() {
|
| 64 |
if(sys_irqrmpolicy(&hook_id)==1){ |
| 65 |
printf("Error unsubscribing int\n");
|
| 66 |
return 1; |
| 67 |
} |
| 68 |
return 0; |
| 69 |
} |
| 70 |
|
| 71 |
void (timer_int_handler)() {
|
| 72 |
count++; |
| 73 |
} |
| 74 |
|
| 75 |
int (timer_get_conf)(uint8_t timer, uint8_t *st) {
|
| 76 |
|
| 77 |
uint8_t read_back = TIMER_RB_CMD | TIMER_RB_COUNT_ | TIMER_RB_SEL(timer); //forming the read-back command (TIMER_RB_CMD (bit 7 and 6)
|
| 78 |
//TIMER_RB_COUNT (BIT 5) and TIMER_RB_SEL (bit timer+1)
|
| 79 |
|
| 80 |
if (sys_outb(TIMER_CTRL, read_back)!=1) { //testing for an error |
| 81 |
switch (timer) {
|
| 82 |
case 0: |
| 83 |
if (util_sys_inb(TIMER_0, st)!=0) { //tests if TIMER_0 was chosen |
| 84 |
printf("Error selecting Timer 0\n");
|
| 85 |
return 1; |
| 86 |
} |
| 87 |
break;
|
| 88 |
case 1: |
| 89 |
if (util_sys_inb(TIMER_1, st)!=0) { //tests if TIMER_1 was chosen |
| 90 |
printf("Error selecting Timer 1\n");
|
| 91 |
return 1; |
| 92 |
} |
| 93 |
break;
|
| 94 |
case 2: |
| 95 |
if (util_sys_inb(TIMER_2, st)!=0) { //tests if TIMER_2 was chosen |
| 96 |
printf("Error selecting Timer 2\n");
|
| 97 |
return 1; |
| 98 |
} |
| 99 |
break;
|
| 100 |
default:
|
| 101 |
printf("No clock selected\n"); //happens if timer<0 or timer>2 |
| 102 |
return 1; |
| 103 |
} |
| 104 |
return 0; |
| 105 |
} |
| 106 |
printf("Error in get config\n");
|
| 107 |
return 1; |
| 108 |
} |
| 109 |
|
| 110 |
int(timer_display_conf)(uint8_t timer, uint8_t st, enum timer_status_field field){ |
| 111 |
|
| 112 |
if(timer < 0 | timer > 2) //tests if the timer has a correct value |
| 113 |
return 1; |
| 114 |
|
| 115 |
union timer_status_field_val config; //create union (needed for the function at the end) |
| 116 |
uint8_t aux; |
| 117 |
aux=st; |
| 118 |
switch(field){
|
| 119 |
case tsf_all:
|
| 120 |
config.byte=aux; |
| 121 |
break;
|
| 122 |
case tsf_initial: //Checking init_mode (mask -> 0x30) |
| 123 |
if((aux & 0x30)==TIMER_LSB){ //if 0x10 |
| 124 |
config.in_mode=LSB_only; |
| 125 |
} |
| 126 |
else if ((aux & 0x30)==TIMER_MSB){ //if 0x20 |
| 127 |
config.in_mode=MSB_only; |
| 128 |
} |
| 129 |
else if((aux & 0x30)==TIMER_LSB_MSB){ //if 0x30 |
| 130 |
config.in_mode=MSB_after_LSB; |
| 131 |
} |
| 132 |
else{
|
| 133 |
config.in_mode=INVAL_val; |
| 134 |
printf("Invalid Initialization Mode\n");
|
| 135 |
return 1; |
| 136 |
} |
| 137 |
break;
|
| 138 |
case tsf_mode: //Checking count_mode (mask -> 0x0E) |
| 139 |
if((aux & 0x0E)==0){ //if 0x00 |
| 140 |
config.count_mode=0;
|
| 141 |
} |
| 142 |
else if((aux & 0x0E)==2){ |
| 143 |
config.count_mode=1;
|
| 144 |
} |
| 145 |
else if((aux & 0x0E)==4|(aux & 0x0E)==12){ |
| 146 |
config.count_mode=2;
|
| 147 |
} |
| 148 |
else if((aux & 0x0E)==6|(aux & 0x0E)==14){ |
| 149 |
config.count_mode=3;
|
| 150 |
} |
| 151 |
else if((aux & 0x0E)==8){ |
| 152 |
config.count_mode=4;
|
| 153 |
} |
| 154 |
else if((aux & 0x0E)==10){ |
| 155 |
config.count_mode=5;
|
| 156 |
} |
| 157 |
else{
|
| 158 |
printf("Error in checking counting mode\n");
|
| 159 |
return 1; |
| 160 |
} |
| 161 |
break;
|
| 162 |
case tsf_base: //Checking bcd (mask -> 0x01) |
| 163 |
if((aux & 0x01)== TIMER_BCD){ |
| 164 |
config.bcd = true; //if the last bit is 1, it's bcd |
| 165 |
} |
| 166 |
else if((aux & 0x01)==TIMER_BIN){ |
| 167 |
config.bcd = false; //if the last bit is 0, it's binary |
| 168 |
} |
| 169 |
else{
|
| 170 |
printf("Error in checking base\n");
|
| 171 |
return 1; |
| 172 |
} |
| 173 |
break;
|
| 174 |
default:
|
| 175 |
return 1; |
| 176 |
|
| 177 |
} |
| 178 |
|
| 179 |
if(timer_print_config(timer, field, config)!=0){ |
| 180 |
printf("Error printing\n");
|
| 181 |
return 1; //function that prints the result |
| 182 |
} |
| 183 |
|
| 184 |
|
| 185 |
return 0; |
| 186 |
|
| 187 |
} |