LCOM1920-T5G03

#ifndef _LCOM_I8254_H_

#define _LCOM_I8254_H_

#include <lcom/lcf.h>

/** @defgroup i8254 i8254

 * @{

 *

 * Constants for programming the i8254 Timer. Needs to be completed.

 */

#define TIMER_FREQ     1193182 /**< @brief clock frequency for timer in PC and AT */

#define TIMER_MIN_FREQ (TIMER_FREQ/UINT16_MAX) + ((TIMER_FREQ % UINT16_MAX) ? 1 : 0) /**< @brief mininum frequency for timer */

#define TIMER0_IRQ     0 /**< @brief Timer 0 IRQ line */

/* I/O port addresses */

#define TIMER_0    0x40 /**< @brief Timer 0 count register */

#define TIMER_1    0x41 /**< @brief Timer 1 count register */

#define TIMER_2    0x42 /**< @brief Timer 2 count register */

#define TIMER_CTRL 0x43 /**< @brief Control register */

#define SPEAKER_CTRL 0x61 /**< @brief Register for speaker control  */

/* Timer control */

/* Timer selection: bits 7 and 6 */

#define TIMER_SEL0   0x00              /**< @brief Control Word for Timer 0 */

#define TIMER_SEL1   BIT(6)            /**< @brief Control Word for Timer 1 */

#define TIMER_SEL2   BIT(7)            /**< @brief Control Word for Timer 2 */

#define TIMER_RB_CMD (BIT(7) | BIT(6)) /**< @brief Read Back Command */

/* Register selection: bits 5 and 4 */

#define TIMER_LSB     BIT(4)                  /**< @brief Initialize Counter LSB only */

#define TIMER_MSB     BIT(5)                  /**< @brief Initialize Counter MSB only */

#define TIMER_LSB_MSB (TIMER_LSB | TIMER_MSB) /**< @brief Initialize LSB first and MSB afterwards */

#define TIMER_INMODE_MASK 0x30      //0011 0000

#define TIMER_INMODE_POS  4

/* Operating mode: bits 3, 2 and 1 */

#define TIMER_SQR_WAVE (BIT(2) | BIT(1)) /**< @brief Mode 3: square wave generator */

#define TIMER_RATE_GEN BIT(2)            /**< @brief Mode 2: rate generator */

#define TIMER_MODE_MASK 0x0E             /**< @brief Mask for mode */

#define TIMER_MODE_POS  1                /**< @brief Position of smallest bit from mode */

#define TIMER_MODE_2ALT 0x6              /**< @brief Alternative notation for mode 2 */

#define TIMER_MODE_3ALT 0x7              /**< @brief Alternative notation for mode 3 */

#define TIMER_MODE_RED2 0x03             /**< @brief Reduce 3-bit mode to 2-bit mode */

/* Counting mode: bit 0 */

#define TIMER_BCD 0x01 /**< @brief Count in BCD */

#define TIMER_BIN 0x00 /**< @brief Count in binary */

/* READ-BACK COMMAND FORMAT */

#define TIMER_RB_COUNT_  BIT(5)

#define TIMER_RB_STATUS_ BIT(4)

#define TIMER_RB_SEL(n)  BIT((n) + 1)

/**@}*/

#endif /* _LCOM_I8254_H */

#include <lcom/lcf.h>

#include "timer.h"

#include "i8254.h"

int (subscribe_timer_interrupt)(uint8_t interrupt_bit, int *interrupt_id) {

    if (interrupt_id == NULL) return 1;

    *interrupt_id = interrupt_bit;

    return (sys_irqsetpolicy(TIMER0_IRQ, IRQ_REENABLE, interrupt_id));

}

int no_interrupts = 0;

void (timer_int_handler)() {

    no_interrupts++;

}

/**

 * This file concerns everything related to the timer

 */

#ifndef TIMER_H_INCLUDED

#define TIMER_H_INCLUDED

#include <stdint.h>

int (subscribe_timer_interrupt)(uint8_t interrupt_bit, int *interrupt_id);

int no_interrupts;

#endif //TIMER_H_INCLUDED