/*
* This file is an interface file for I2C communication between MCU (Controller) and other peripherals (Target): i2c_hal.c
* Context:
* Our current functions in ADC and DAC are tightly coupled with I2C communication. 
* Need a communication mechanism to isolate the flow of the ADC function from Asynchronous calls.
* Decision:
* i2c_controller_interface is a header file which defines what the I2C peripheral does:
* - i2c READ
* - i2c WRITE
* - i2c start controller transfer
* - i2c enable interrupt
* - i2c bus wait
* Consequences:
* Cleaner platform independent file

Reference:
- https://www.embeddedrelated.com/showarticle/1596.php
- https://www.beningo.com/5-tips-for-designing-an-interface-in-c/
- https://iot.sites.arm.com/open-iot-sdk/libraries/mcu-driver-hal/mcu-driver-hal/pwmout__api_8h_source.html
*/

#ifndef I2C_INTERFACE_H_
#define I2C_INTERFACE_H_

#include <stdint.h>
#include <stdbool.h>

//Maximum packet sizes
#define I2C_TX_MAX_PACKET_SIZE (4)  
#define I2C_RX_MAX_PACKET_SIZE (4)  

typedef struct {
    volatile bool complete;
    uint8_t packet[I2C_RX_MAX_PACKET_SIZE];
    uint8_t count;
    uint8_t len;
} I2CRxPackage;

extern I2CRxPackage controllerRxPackage;

typedef struct {
    volatile bool complete;
    uint8_t packet[I2C_TX_MAX_PACKET_SIZE];
    uint8_t count;
    uint8_t len;
} I2CTxPackage;
extern I2CTxPackage controllerTxPackage;

/*
* Since C does not allows to add functions in typedef struct, however a function pointer can be included in Structure in C. This interface provides a standard features of i2c_hal
*/
typedef struct{
    bool (*write)(uint8_t const TARGET_ADDRESS);
    bool (*read) (uint8_t const TARGET_ADDRESS);
} I2C_Interface;

extern I2C_Interface i2c_hal;

#endif