root / lab2 / timer.c @ 13
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#include <lcom/lcf.h> |
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#include <lcom/timer.h> |
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#include <stdint.h> |
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#include "i8254.h" |
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unsigned int count=0; //Initializing counter |
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int hook_id = TIMER0_IRQ;
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int (timer_set_frequency)(uint8_t timer, uint32_t freq) {
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if(freq<19){ |
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return 1; |
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} |
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//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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uint16_t div = (TIMER_FREQ /freq); |
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uint8_t msb, lsb; |
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util_get_LSB(div,&lsb); //getting LSB
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util_get_MSB(div,&msb); //getting MSB
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uint8_t st; |
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if(timer_get_conf(timer,&st)==1){ |
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printf("Error getting conf in frequency set\n");
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return 1; |
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} |
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if(timer<0|timer>2){ |
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printf("Error selecting timer in frequency set\n");
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return 1; |
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} |
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else
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{
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if(timer==0){ |
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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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sys_outb(TIMER_CTRL,st); //Sends control word to program the timer
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sys_outb(TIMER_0,lsb); |
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sys_outb(TIMER_0,msb); //Both these functions program the timer
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} |
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else if(timer==1){ |
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st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL1);
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sys_outb(TIMER_CTRL,st); |
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sys_outb(TIMER_1,lsb); |
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sys_outb(TIMER_1,msb); |
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} |
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else if(timer==2){ |
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st= ((st & 0x0F)|TIMER_LSB_MSB|TIMER_SEL2);
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sys_outb(TIMER_CTRL,st); |
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sys_outb(TIMER_2,lsb); |
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sys_outb(TIMER_2,msb); |
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} |
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} |
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return 0; |
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} |
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int (timer_subscribe_int)(uint8_t *bit_no) {
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*bit_no = BIT(hook_id); |
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if(sys_irqsetpolicy(TIMER0_IRQ,IRQ_REENABLE,&hook_id)==1){ //operation to subscribe int |
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printf("Error subscribing int\n");
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return 1; |
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} |
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return 0; |
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} |
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int (timer_unsubscribe_int)() {
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if(sys_irqrmpolicy(&hook_id)==1){ |
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printf("Error unsubscribing int\n");
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return 1; |
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} |
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return 0; |
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} |
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void (timer_int_handler)() {
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count++; |
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} |
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int (timer_get_conf)(uint8_t timer, uint8_t *st) {
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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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//TIMER_RB_COUNT (BIT 5) and TIMER_RB_SEL (bit timer+1)
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if (sys_outb(TIMER_CTRL, read_back)==0) { //testing for an error |
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switch (timer) {
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case 0: |
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if (util_sys_inb(TIMER_0, st)==1) { //tests if TIMER_0 was chosen |
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printf("Error selecting Timer 0\n");
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return 1; |
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} |
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break;
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case 1: |
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if (util_sys_inb(TIMER_1, st)==1) { //tests if TIMER_1 was chosen |
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printf("Error selecting Timer 1\n");
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return 1; |
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} |
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break;
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case 2: |
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if (util_sys_inb(TIMER_2, st)==1) { //tests if TIMER_2 was chosen |
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printf("Error selecting Timer 2\n");
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return 1; |
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} |
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break;
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default:
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printf("No clock selected\n"); //happens if timer<0 or timer>2 |
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return 1; |
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} |
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return 0; |
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} |
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printf("Error in get config\n");
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return 1; |
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} |
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int(timer_display_conf)(uint8_t timer, uint8_t st, enum timer_status_field field){ |
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if(timer<0|timer>2){ //tests for error in timer selection |
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printf("Error selecting timer\n");
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return 1; |
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} |
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union timer_status_field_val config; //create union (needed for the function at the end) |
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uint8_t aux; |
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aux=st; |
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switch(field){
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case tsf_all:
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config.byte=aux; |
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break;
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case tsf_initial: //Checking init_mode (mask -> 0x30) |
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if((aux & 0x30)==TIMER_LSB){ //if 0x10 |
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config.in_mode=LSB_only; |
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} |
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else if ((aux & 0x30)==TIMER_MSB){ //if 0x20 |
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config.in_mode=MSB_only; |
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} |
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else if((aux & 0x30)==TIMER_LSB_MSB){ //if 0x30 |
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config.in_mode=MSB_after_LSB; |
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} |
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else{
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config.in_mode=INVAL_val; |
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printf("Invalid Initialization Mode\n");
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return 1; |
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} |
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break;
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case tsf_mode: //Checking count_mode (mask -> 0x0E) |
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if((aux & 0x0E)==0){ //if 0x00 |
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config.count_mode=0;
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} |
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else if((aux & 0x0E)==2){ //if 0x02 |
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config.count_mode=1;
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} |
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else if((aux & 0x0E)==4|(aux & 0x0E)==12){ //if 0x04 or 0x0C |
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config.count_mode=2;
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} |
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else if((aux & 0x0E)==6|(aux & 0x0E)==14){ //if 0x06 or 0x0E |
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config.count_mode=3;
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} |
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else if((aux & 0x0E)==8){ //if 0x08 |
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config.count_mode=4;
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} |
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else if((aux & 0x0E)==10){ //if 0x0A |
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config.count_mode=5;
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} |
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else{
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printf("Error in checking counting mode\n");
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return 1; |
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} |
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break;
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case tsf_base: //Checking bcd (mask -> 0x01) |
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if((aux & 0x01)== TIMER_BCD){ |
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config.bcd = true; //if the last bit is 1, it's bcd |
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} |
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else if((aux & 0x01)==TIMER_BIN){ |
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config.bcd = false; //if the last bit is 0, it's binary |
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} |
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else{
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printf("Error in checking base\n");
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return 1; |
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} |
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break;
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default:
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return 1; |
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} |
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if(timer_print_config(timer, field, config)==1){ //function that prints the result |
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printf("Error printing\n");
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return 1; |
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} |
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return 0; |
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} |