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/**
 * @file u8g2_esp32_hal.h
 * @date Feb 12, 2017
 * @author kolban
 */

#ifndef U8G2_ESP32_HAL_H_
#define U8G2_ESP32_HAL_H_
#include "u8g2.h"

#include "driver/gpio.h"
#include "driver/spi_master.h"
#include "driver/i2c.h"

#define U8G2_ESP32_HAL_UNDEFINED	(-1)			///<  Undefined value for this HAL

#define I2C_MASTER_NUM	(CONFIG_I2C_MASTER_PORT_NUM)		///<  I2C port number for master dev (original 1)
#define I2C_MASTER_TX_BUF_DISABLE	0			///<  I2C master do not need buffer
#define I2C_MASTER_RX_BUF_DISABLE	0			///<  I2C master do not need buffer
#define I2C_MASTER_FREQ_HZ	(CONFIG_I2C_MASTER_FREQUENCY)	///<  I2C master clock frequency (original 50000)
#define ACK_CHECK_EN			0x1			///<  I2C master will check ack from slave
#define ACK_CHECK_DIS			0x0			///<  I2C master will not check ack from slave

typedef struct {
	gpio_num_t clk;				///< SPI clock
	gpio_num_t mosi;			///< SPI mosi
	gpio_num_t sda;				///< data for I²C
	gpio_num_t scl;				///< clock for I²C
	gpio_num_t cs;				///< SPI cs
	gpio_num_t reset;			///< SPI reset
	gpio_num_t dc;
} u8g2_esp32_hal_t;				///< HAL structure

#define U8G2_ESP32_HAL_DEFAULT {U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED, U8G2_ESP32_HAL_UNDEFINED }

/**
 * @brief Initialze the ESP32 HAL.
 */
void u8g2_esp32_hal_init(u8g2_esp32_hal_t u8g2_esp32_hal_param);

/**
 * @brief HAL callback function as prescribed by the U8G2 library.
 *        This callback is invoked to handle SPI communications.
 */
uint8_t u8g2_esp32_spi_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);

/**
 * @brief HAL callback function as prescribed by the U8G2 library.
 *        This callback is invoked to handle I2C communications.
 */
uint8_t u8g2_esp32_i2c_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);

/**
 * @brief HAL callback function as prescribed by the U8G2 library.
 *        This callback is invoked to handle callbacks for GPIO and delay functions.
 */
uint8_t u8g2_esp32_gpio_and_delay_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
#endif /* U8G2_ESP32_HAL_H_ */