/**
 * @brief The Main program header.
 * @details this file contains the prototypes and structs.
 * @author Jake Goodwin
 * @date 2025
 * @copyright None
 * @file main.h
 */

#ifndef MAIN_H
#define MAIN_H

#ifndef __AVR_ATtiny13A__
#define __AVR_ATtiny13A__
#endif

#include <avr/io.h>


//#############################
//Defines
//#############################

#ifndef UINT8_MAX
#define UINT8_MAX 256
#endif


//This is the bitpattern that should be at address 0x00
#define START_PATTERN 0xAA
#define END_PATTERN 0x55

//Addresses in the eeprom for the two switch states 
#define ROM_SP_ADR      0x0
#define POSITION1_ADR     0x1
#define POSITION2_ADR     0x2
#define ROM_EP_ADR      0x3

//Debounce check number.
#define MAX_CHECKS 10

#define LED_PORT (1<<5) 
#define LED_PIN PB5
#define BLINK_DELAY_MS 5000

#define PWM_PIN1 PB0  // Pin 5 - Motor PWM 1
#define PWM_PIN2 PB1  // Pin 6 - Motor PWM 2
#define ADC_PIN PB3   // Pin 2 - Fader position reading
#define SPEED_PIN PB2 // Pin 7/ADC1
#define BUTTON_PIN PB4 // Pin 3 - Button input

#define MOTOR_PULSE 1 //uS motor base pulse


/*The timing of "ticks" is dependent on the AVR timer's counter register
 * so for an 8bit register the maximum value is 256. Given we stick with
 * a 1Mhz cpu frequency can use this formula to calculate the number of
 * interrupts(timer overflows) per second:
 *
 * OVF_S = (F_CPU / DIV)/ (2^8)
 * 61 = (1000000 / 64) / 256
 *
 * This is important because the ATiny13/A only have a single timer built into
 * them.
 *
 * Ticks are used as our way of keep track of long button presses.
 * */
//original sent had 60
#define LONG_PRESS_TICKS 66

// Define DISABLE_TEMPORARY_SWITCH to turn off the ability to hold
// the switch to temporarily engage/bypass.
//#define DISABLE_TEMPORARY_SWITCH

#define PIN_SW1     PINB2
#define PIN_ACTIVE1 PB1
#define PIN_MUTE    PB0


//#############################
//Typedefs & sttructs
//#############################

/*A structure to hold the button info*/
typedef struct {
    uint8_t is_pressed: 1;
    uint8_t is_long_pressed: 1;
    uint8_t is_active: 1;
    uint8_t timer_enabled: 1;
    uint8_t pressed_ticks;
    uint8_t input_pin;
}btn_state; 


//#############################
//Public Prototypes
//#############################

/**
 * @brief Initializes the uC for the program. 
 */
void InitProg(void);


/**
 * @brief Reads the ADC pin from the fader.
 */
uint16_t ReadFader(void);


/**
 * @brief Reads the ADC value from the Speed pot.
 */
uint8_t ReadSpeed(void);


/**
 * @brief Moves the motor to target location based off the PB3.
 * @param[in] 8bit value representing fader location.
 */
void MotorMoveTo(uint8_t target);

/**
 * @brief Turns off motor allowing free movement.
 */
void MotorCoast(void);

/**
 * @brief Activates the motor driver in forward or reverse.
 * @param[in] moves foward when true and in reverse when false.
 */
void MotorMove(uint8_t fwd);

#endif