/**
 * \file
 *
 * \brief ST7565R display controller driver.
 *
 * Copyright (c) 2011 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */
#include "st7565r.h"

/**
 * \internal
 * \brief Initialize the hardware interface
 *
 * Depending on what interface used for interfacing the LCD controller this
 * function will initialize the neccesary hardware.
 */
static void st7565r_interface_init(void)
{
#ifdef ST7565R_SERIAL_INTERFACE
	spi_flags_t spi_flags = SPI_MODE_3;
	board_spi_select_id_t spi_select_id = 0;
#endif

#if defined(ST7565R_USART_SPI_INTERFACE)
	struct usart_spi_device device = {
		.id = ST7565R_CS_PIN,
	};
	usart_spi_init(ST7565R_USART_SPI);
	usart_spi_setup_device(ST7565R_USART_SPI, &device, spi_flags,
			ST7565R_CLOCK_SPEED, spi_select_id);
#elif defined(ST7565R_SPI_INTERFACE)
	struct spi_device device = {
		.id = ST7565R_CS_PIN,
	};
	spi_master_init(ST7565R_SPI);
	spi_master_setup_device(ST7565R_SPI, &device, spi_flags,
			ST7565R_CLOCK_SPEED, spi_select_id);
#endif
}

/**
 * \brief Initialize the LCD controller
 *
 * Call this function to initialize the hardware interface and the LCD
 * controller. When initialization is done the display is turned on and ready
 * to receive data.
 */
void st7565r_init(void)
{
	// Do a hard reset of the LCD display controller
	st7565r_hard_reset();

	// Initialize the interface
	st7565r_interface_init();

	// Set the A0 pin to the default state (command)
	gpio_set_pin_low(ST7565R_A0_PIN);

	// The column address is set to increasing
	st7565r_write_command(ST7565R_CMD_ADC_NORMAL);

	// Non-inverted display
	st7565r_display_invert_disable();

	// The common mode scan direction is reversed COM31->COM0
	st7565r_write_command(ST7565R_CMD_REVERSE_SCAN_DIRECTION);

	// Set the voltage bias ratio to 1/6
	st7565r_write_command(ST7565R_CMD_LCD_BIAS_1_DIV_6_DUTY33);

	// Set booster circuit, voltage regulator and voltage follower all to on
	st7565r_write_command(ST7565R_CMD_POWER_CTRL_ALL_ON);

	// Set the booster ratio to 2X,3X,4X
	st7565r_write_command(ST7565R_CMD_BOOSTER_RATIO_SET);
	st7565r_write_command(ST7565R_CMD_BOOSTER_RATIO_2X_3X_4X);

	// Set voltage resistor ratio to 1
	st7565r_write_command(ST7565R_CMD_VOLTAGE_RESISTOR_RATIO_1);

	/* Set contrast to min value, no need to check return value as the contrast
	is set to the defined min*/
	st7565r_set_contrast(ST7565R_DISPLAY_CONTRAST_MIN);

	// Turn on the display
	st7565r_display_on();
}
