/**
 * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * 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, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, 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. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS 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.
 *
 */
#include "nrf_drv_spi.h"
#include "app_util_platform.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "boards.h"
#include "app_error.h"
#include <string.h>
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#define SPI_INSTANCE  0 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
static volatile bool spi_xfer_done;  /**< Flag used to indicate that SPI instance completed the transfer. */

#define TEST_STRING "Nordic"
static uint8_t       m_tx_buf[] = TEST_STRING;           /**< TX buffer. */
static uint8_t       m_rx_buf[sizeof(TEST_STRING) + 1];    /**< RX buffer. */
static const uint8_t m_length = sizeof(m_tx_buf);        /**< Transfer length. */




#define CTRL_REG1		0x20
#define CTRL_REG2		0x21
#define CTRL_REG3		0x22
#define CTRL_REG4		0x23
#define CTRL_REG5		0x24
#define CTRL_REG6		0x25
#define INT1_CFG		0x30
#define INT1_SRC		0x31
#define INT1_THS		0x32
#define INT1_DUR		0x33

#define LIS3DH_READ_MSK	128
#define LIS3DH_WRITE_MSK  0


/**
 * @brief SPI user event handler.
 * @param event
 */
void spi_event_handler(nrf_drv_spi_evt_t const * p_event,
                       void *                    p_context)
{
    spi_xfer_done = true;
    NRF_LOG_INFO("Transfer completed.");
    if (m_rx_buf[0] != 0)
    {
        NRF_LOG_INFO(" Received:");
        NRF_LOG_HEXDUMP_INFO(m_rx_buf, strlen((const char *)m_rx_buf));
    }
}

static __INLINE uint8_t lis3dh_spi_read_write(const uint8_t reg, const uint8_t data)
{
//	uint8_t rx_buffer[2], tx_buffer[] = { reg, data };
    m_tx_buf [0] = reg;
    m_tx_buf [1] = data;
    
    spi_xfer_done = false;
    
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, m_length, m_rx_buf, m_length));
    
    while (!spi_xfer_done)
    {
        __WFE();
    }
	return m_rx_buf[1];
}

uint8_t lis3dh_read(const uint8_t reg) 
{		
	return lis3dh_spi_read_write(reg | LIS3DH_READ_MSK, 0xAA);	
}

void lis3dh_write(const uint8_t reg, const uint8_t data) 
{
	lis3dh_spi_read_write(reg | LIS3DH_WRITE_MSK, data);	
}




int main(void)
{
    bsp_board_init(BSP_INIT_LEDS);

    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    NRF_LOG_DEFAULT_BACKENDS_INIT();

    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
//    spi_config.ss_pin   = SPI_SS_PIN;
//    spi_config.miso_pin = SPI_MISO_PIN;
//    spi_config.mosi_pin = SPI_MOSI_PIN;
//    spi_config.sck_pin  = SPI_SCK_PIN;
    spi_config.ss_pin   = 10;
    spi_config.miso_pin = 9;
    spi_config.mosi_pin = 8;
    spi_config.sck_pin  = 7;
    
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

    NRF_LOG_INFO("SPI example started.");

        
    
    lis3dh_write(CTRL_REG1, 0x2F); 			// low power mode, 10Hz
//	lis3dh_write(CTRL_REG2, 0x01); 			// high pass filter enabled for AOI1
//	lis3dh_write(CTRL_REG3, 0x40); 			// AOI1 interrupt on INT1
//	lis3dh_write(CTRL_REG4, 0x80); 			// BDU, full scale = +-2g
//	lis3dh_write(CTRL_REG5, 0x00); 			
//	lis3dh_write(INT1_CFG, 	0x15);			// X Or Y Or Z low events	
    
    if (lis3dh_read(CTRL_REG1) != 0x2F)
    {
        int a = 10; // зажигаем два светодиода на 5 сек, если ошибка чтения SPI
        a++;
    }
    nrf_drv_spi_uninit(&spi); // деинициализация SPI
    
    
    while (1)
    {
//        // Reset rx buffer and transfer done flag
//        memset(m_rx_buf, 0, m_length);
//        spi_xfer_done = false;

//        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, m_length, m_rx_buf, m_length));

//        while (!spi_xfer_done)
//        {
//            __WFE();
//        }

//        NRF_LOG_FLUSH();

//        bsp_board_led_invert(BSP_BOARD_LED_0);
//        nrf_delay_ms(200);
    }
}