root / lab2 / timer.c @ 4
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| 1 | 3 | up20180645 | #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 | 4 | up20180645 | unsigned int count=0; //Initializing counter |
| 9 | int hook_id = TIMER0_IRQ;
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| 10 | |||
| 11 | 3 | up20180645 | int (timer_set_frequency)(uint8_t timer, uint32_t freq) {
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| 12 | 4 | up20180645 | // freq=TIMER_FREQ/div, where TIMER_FREQ is the frequency of the clock and div os the value loaded nittially in the timer
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| 13 | uint16_t div = (TIMER_FREQ /freq); |
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| 14 | 3 | up20180645 | |
| 15 | 4 | up20180645 | uint8_t msb, lsb; |
| 16 | |||
| 17 | util_get_LSB(div,&lsb); //getting LSB
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| 18 | util_get_MSB(div,&msb); //getting MSB
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| 19 | |||
| 20 | uint8_t st; |
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| 21 | |||
| 22 | if(timer_get_conf(timer,&st)!=0){ |
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| 23 | printf("Error getting conf in frequency set\n");
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| 24 | return 1; |
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| 25 | } |
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| 26 | if(timer<0|timer>2){ |
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| 27 | printf("Error selecting timer in frequency set\n");
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| 28 | return 1; |
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| 29 | } |
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| 30 | else
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| 31 | {
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| 32 | if(timer==0){ |
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| 33 | st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL0); //The mask 0x0f is used so that the 4 LSBs are not changed |
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| 34 | sys_outb(TIMER_CTRL,st); //Sends control word to program the timer
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| 35 | sys_outb(TIMER_0,lsb); |
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| 36 | sys_outb(TIMER_0,msb); //Both these functions program the timer
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| 37 | } |
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| 38 | else if(timer==1){ |
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| 39 | st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL1);
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| 40 | sys_outb(TIMER_CTRL,st); |
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| 41 | sys_outb(TIMER_1,lsb); |
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| 42 | sys_outb(TIMER_1,msb); |
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| 43 | } |
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| 44 | else if(timer==2){ |
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| 45 | st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL2);
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| 46 | sys_outb(TIMER_CTRL,st); |
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| 47 | sys_outb(TIMER_2,lsb); |
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| 48 | sys_outb(TIMER_2,msb); |
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| 49 | } |
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| 50 | } |
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| 51 | return 0; |
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| 52 | 3 | up20180645 | } |
| 53 | |||
| 54 | int (timer_subscribe_int)(uint8_t *bit_no) {
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| 55 | 4 | up20180645 | *bit_no = BIT(hook_id); |
| 56 | if(sys_irqsetpolicy(TIMER0_IRQ,IRQ_REENABLE,&hook_id)==1){ //operation to subscribe int |
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| 57 | printf("Error subscribing int\n");
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| 58 | return 1; |
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| 59 | } |
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| 60 | return 0; |
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| 61 | 3 | up20180645 | } |
| 62 | |||
| 63 | int (timer_unsubscribe_int)() {
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| 64 | 4 | up20180645 | if(sys_irqrmpolicy(&hook_id)==1){ |
| 65 | printf("Error unsubscribing int\n");
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| 66 | return 1; |
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| 67 | } |
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| 68 | return 0; |
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| 69 | 3 | up20180645 | } |
| 70 | |||
| 71 | void (timer_int_handler)() {
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| 72 | 4 | up20180645 | count++; |
| 73 | 3 | up20180645 | } |
| 74 | |||
| 75 | int (timer_get_conf)(uint8_t timer, uint8_t *st) {
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| 76 | |||
| 77 | 4 | up20180645 | 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)
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| 78 | //TIMER_RB_COUNT (BIT 5) and TIMER_RB_SEL (bit timer+1)
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| 79 | |||
| 80 | if (sys_outb(TIMER_CTRL, read_back)!=1) { //testing for an error |
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| 81 | switch (timer) {
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| 82 | case 0: |
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| 83 | if (util_sys_inb(TIMER_0, st)!=0) { //tests if TIMER_0 was chosen |
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| 84 | printf("Error selecting Timer 0\n");
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| 85 | return 1; |
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| 86 | } |
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| 87 | break;
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| 88 | case 1: |
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| 89 | if (util_sys_inb(TIMER_1, st)!=0) { //tests if TIMER_1 was chosen |
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| 90 | printf("Error selecting Timer 1\n");
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| 91 | return 1; |
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| 92 | } |
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| 93 | break;
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| 94 | case 2: |
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| 95 | if (util_sys_inb(TIMER_2, st)!=0) { //tests if TIMER_2 was chosen |
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| 96 | printf("Error selecting Timer 2\n");
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| 97 | return 1; |
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| 98 | } |
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| 99 | break;
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| 100 | default:
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| 101 | printf("No clock selected\n"); //happens if timer<0 or timer>2 |
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| 102 | return 1; |
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| 103 | } |
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| 104 | return 0; |
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| 105 | } |
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| 106 | printf("Error in get config\n");
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| 107 | return 1; |
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| 108 | 3 | up20180645 | } |
| 109 | |||
| 110 | 4 | up20180645 | int(timer_display_conf)(uint8_t timer, uint8_t st, enum timer_status_field field){ |
| 111 | 3 | up20180645 | |
| 112 | 4 | up20180645 | if(timer < 0 | timer > 2) //tests if the timer has a correct value |
| 113 | return 1; |
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| 114 | |||
| 115 | union timer_status_field_val config; //create union (needed for the function at the end) |
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| 116 | uint8_t aux; |
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| 117 | aux=st; |
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| 118 | switch(field){
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| 119 | case tsf_all:
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| 120 | config.byte=aux; |
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| 121 | break;
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| 122 | case tsf_initial: //Checking init_mode (mask -> 0x30) |
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| 123 | if((aux & 0x30)==TIMER_LSB){ //if 0x10 |
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| 124 | config.in_mode=LSB_only; |
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| 125 | } |
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| 126 | else if ((aux & 0x30)==TIMER_MSB){ //if 0x20 |
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| 127 | config.in_mode=MSB_only; |
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| 128 | } |
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| 129 | else if((aux & 0x30)==TIMER_LSB_MSB){ //if 0x30 |
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| 130 | config.in_mode=MSB_after_LSB; |
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| 131 | } |
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| 132 | else{
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| 133 | config.in_mode=INVAL_val; |
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| 134 | printf("Invalid Initialization Mode\n");
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| 135 | return 1; |
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| 136 | } |
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| 137 | break;
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| 138 | case tsf_mode: //Checking count_mode (mask -> 0x0E) |
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| 139 | if((aux & 0x0E)==0){ //if 0x00 |
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| 140 | config.count_mode=0;
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| 141 | } |
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| 142 | else if((aux & 0x0E)==2){ |
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| 143 | config.count_mode=1;
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| 144 | } |
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| 145 | else if((aux & 0x0E)==4|(aux & 0x0E)==12){ |
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| 146 | config.count_mode=2;
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| 147 | } |
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| 148 | else if((aux & 0x0E)==6|(aux & 0x0E)==14){ |
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| 149 | config.count_mode=3;
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| 150 | } |
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| 151 | else if((aux & 0x0E)==8){ |
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| 152 | config.count_mode=4;
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| 153 | } |
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| 154 | else if((aux & 0x0E)==10){ |
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| 155 | config.count_mode=5;
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| 156 | } |
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| 157 | else{
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| 158 | printf("Error in checking counting mode\n");
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| 159 | return 1; |
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| 160 | } |
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| 161 | break;
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| 162 | case tsf_base: //Checking bcd (mask -> 0x01) |
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| 163 | if((aux & 0x01)== TIMER_BCD){ |
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| 164 | config.bcd = true; //if the last bit is 1, it's bcd |
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| 165 | } |
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| 166 | else if((aux & 0x01)==TIMER_BIN){ |
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| 167 | config.bcd = false; //if the last bit is 0, it's binary |
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| 168 | } |
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| 169 | else{
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| 170 | printf("Error in checking base\n");
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| 171 | return 1; |
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| 172 | } |
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| 173 | break;
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| 174 | default:
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| 175 | return 1; |
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| 176 | |||
| 177 | } |
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| 178 | |||
| 179 | if(timer_print_config(timer, field, config)!=0){ |
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| 180 | printf("Error printing\n");
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| 181 | return 1; //function that prints the result |
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| 182 | } |
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| 183 | |||
| 184 | |||
| 185 | return 0; |
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| 186 | |||
| 187 | 3 | up20180645 | } |