/**
 * ENSICAEN
 * 6 Boulevard Maréchal Juin
 * F-14050 Caen Cedex
 *
 * This file is owned by ENSICAEN students. No portion of this
 * document may be reproduced, copied or revised without written
 * permission of the authors.
 */

/**
 * @author  Dimitri Boudier <dimitri.boudier@ensicaen.fr>
 * @version 1.0.0 - 2023-09-27
 *
 * @todo	Nothing.
 * @bug		None.
 * @note 	This driver can be used with only ONE Light click at once.
 */

/**
 * @file light_click.c
 * @brief Driver for the MIKROE "Light click" board
 *
 * Ref. https://www.mikroe.com/light-click
 */


#include "main.h"
#include "light_click.h"


/*****************************************************************************
 * GLOBAL VARIABLE DECLARATIONS
 *****************************************************************************/

LIGHT_handle_t light_handle;



/*****************************************************************************
 * FUNCTION DEFINITIONS
 *****************************************************************************/

void LIGHT_init(SPI_HandleTypeDef *hspi, GPIO_TypeDef *SS_Port, uint16_t SS_Pin)
{
	light_handle.hspi = hspi;

	light_handle.SS_Port = SS_Port;
	light_handle.SS_Pin  = SS_Pin;
}


void LIGHT_getBrightnessRaw(uint16_t* brightness_raw)
{
	uint8_t reply[2];

	HAL_GPIO_WritePin(light_handle.SS_Port, light_handle.SS_Pin, RESET);
	HAL_SPI_Receive(light_handle.hspi, reply, sizeof(reply), HAL_MAX_DELAY);
	HAL_GPIO_WritePin(light_handle.SS_Port, light_handle.SS_Pin, SET);

	/*
	 * See MCP3201 Datasheet, Figure 6-1
	 * |    1st byte (reply[0])   |    2nd byte (reply[1])   |
	 * |--X-X-0-B11-B10-B9-B8-B7--|--B6-B5-B4-B3-B2-B1-B0-X--|
	 */
	*brightness_raw  = (uint16_t)(reply[0] & 0x1F) << 7;
	*brightness_raw += (uint16_t)(reply[1]       ) >> 1;
}


void LIGHT_getBrightnessPercentage(float* brightness_percentage)
{
	uint16_t brightness_raw;
	LIGHT_getBrightnessRaw( &brightness_raw );

	*brightness_percentage  = (float)brightness_raw;
	*brightness_percentage /= 4095.0;
	*brightness_percentage *=  100.0;
}