/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "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
 * DISCLAIMED. IN NO EVENT SHALL NATIONS 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.
 * ****************************************************************************/

/**
 * @file main.c
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
#include "n32g030.h"
#include "log.h"

#include <string.h>

typedef enum
{
    FAILED = 0,
    PASSED = !FAILED
} Status;

#define I2C1_SLAVE_ADDRESS7 0x30
#define I2C2_SLAVE_ADDRESS7 0x30
#define BUFFER_SIZE         8
#define I2C_CLK_SPEED       100000

I2C_InitType I2C_InitStructure;
DMA_InitType DMA_InitStructure;
uint8_t I2C1_Tx_Buffer[BUFFER_SIZE] = {1, 2, 3, 4, 5, 6, 7, 8};
uint8_t I2C2_Rx_Buffer[BUFFER_SIZE];
uint8_t Tx_Idx = 0, Rx_Idx = 0;
void RCC_Configuration(void);
void GPIO_Configuration(void);

int main(void)
{
    log_init();

    log_info("\n this is a DMA I2C to RAM Demo.\n");
    
    /* System Clocks Configuration */
    RCC_Configuration();
    
    /* Configure the GPIO ports */
    GPIO_Configuration();
    
    /* DMA channel5 configuration ----------------------------------------------*/
    DMA_DeInit(DMA_CH5);
	DMA_StructInit(&DMA_InitStructure);
    DMA_InitStructure.PeriphAddr     = (uint32_t)&I2C2->DAT;
    DMA_InitStructure.MemAddr        = (uint32_t)I2C2_Rx_Buffer;
    DMA_InitStructure.Direction      = DMA_DIR_PERIPH_SRC;
    DMA_InitStructure.BufSize        = BUFFER_SIZE;
    DMA_InitStructure.PeriphInc      = DMA_PERIPH_INC_DISABLE;
    DMA_InitStructure.DMA_MemoryInc  = DMA_MEM_INC_ENABLE;
    DMA_InitStructure.PeriphDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.MemDataSize    = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.CircularMode   = DMA_MODE_NORMAL;
    DMA_InitStructure.Priority       = DMA_PRIORITY_VERY_HIGH;
    DMA_InitStructure.Mem2Mem        = DMA_M2M_DISABLE;
    DMA_Init(DMA_CH5, &DMA_InitStructure);
    DMA_RequestRemap(DMA_REMAP_I2C2_RX,DMA,DMA_CH5,ENABLE);
    /* DMA channel6 configuration ----------------------------------------------*/
    DMA_DeInit(DMA_CH1);
    DMA_InitStructure.PeriphAddr = (uint32_t)&I2C1->DAT;
    DMA_InitStructure.MemAddr    = (uint32_t)I2C1_Tx_Buffer;
    DMA_InitStructure.Direction  = DMA_DIR_PERIPH_DST;
    DMA_InitStructure.Priority   = DMA_PRIORITY_HIGH;
    DMA_Init(DMA_CH1, &DMA_InitStructure);
    DMA_RequestRemap(DMA_REMAP_I2C1_TX,DMA,DMA_CH1,ENABLE);

    I2C_DeInit(I2C1);

    I2C_InitStruct(&I2C_InitStructure);
    /* I2C1 configuration ------------------------------------------------------*/
    I2C_InitStructure.BusMode     = I2C_BUSMODE_I2C;
    I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2;
    I2C_InitStructure.OwnAddr1    = I2C1_SLAVE_ADDRESS7;
    I2C_InitStructure.AckEnable   = I2C_ACKEN;
    I2C_InitStructure.AddrMode    = I2C_ADDR_MODE_7BIT;
    I2C_InitStructure.ClkSpeed    = I2C_CLK_SPEED;
    I2C_Init(I2C1, &I2C_InitStructure);
    /* I2C2 configuration ------------------------------------------------------*/
    I2C_InitStructure.OwnAddr1 = I2C2_SLAVE_ADDRESS7;
    I2C_Init(I2C2, &I2C_InitStructure);
    
    /* Enable I2C1 and I2C2 ----------------------------------------------------*/
    I2C_Enable(I2C1, ENABLE);
    I2C_Enable(I2C2, ENABLE);

    /*----- Transmission Phase -----*/
    /* Send I2C1 START condition */
    I2C_GenerateStart(I2C1, ENABLE);
    /* Test on I2C1 EV5 and clear it */
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_MODE_FLAG))
        ;
    /* Send I2C2 slave Address for write */
    I2C_SendAddr7bit(I2C1, I2C2_SLAVE_ADDRESS7, I2C_DIRECTION_SEND);
    /* Test on I2C2 EV1 and clear it */
    while (!I2C_CheckEvent(I2C2, I2C_EVT_SLAVE_RECV_ADDR_MATCHED))
        ;
    /* Test on I2C1 EV6 and clear it */
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_TXMODE_FLAG))
        ;

    /* Enable I2C2 DMA */
    I2C_EnableDMA(I2C2, ENABLE);
    /* Enable I2C1 DMA */
    I2C_EnableDMA(I2C1, ENABLE);

    /* Enable DMA Channel5 */
    DMA_EnableChannel(DMA_CH5, ENABLE);
    /* Enable DMA Channel6 */
    DMA_EnableChannel(DMA_CH1, ENABLE);

    /* DMA Channel5 transfer complete test */
    while (!DMA_GetFlagStatus(DMA_FLAG_TC5, DMA))
        ;
    /* DMA Channel6 transfer complete test */
    while (!DMA_GetFlagStatus(DMA_FLAG_TC1, DMA))
        ;

    /* Send I2C1 STOP Condition */
    I2C_GenerateStop(I2C1, ENABLE);
    /* Test on I2C2 EV4 */
    while (!I2C_CheckEvent(I2C2, I2C_EVT_SLAVE_STOP_RECVD))
        ;
    /* Clear I2C2 STOPF flag: read operation to I2C_STS1 followed by a
    write operation to I2C_CTRL1 */
    (void)(I2C_GetFlag(I2C2, I2C_FLAG_STOPF));
    I2C_Enable(I2C2, ENABLE);
    
    /* Check if the transmitted and received data are equal */
    if (memcmp(I2C1_Tx_Buffer, I2C2_Rx_Buffer, BUFFER_SIZE) == 0)
    {
        log_info("DMA I2C to RAM passed\n");
    }
    else
    {
        log_error("DMA I2C to RAM failed\n");
    }

    while (1)
    {
    }
}

/**
 * @brief  Configures the different system clocks.
 */
void RCC_Configuration(void)
{
    /* Enable DMA clock */
    RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_DMA, ENABLE);
    /* Enable GPIO clock */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB | RCC_APB2_PERIPH_GPIOA | RCC_APB2_PERIPH_AFIO, ENABLE);
    /* Enable I2C1 and I2C2 clock */
    RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C1 | RCC_APB1_PERIPH_I2C2, ENABLE);
}

/**
 * @brief  Configures the different GPIO ports.
 */
void GPIO_Configuration(void)
{
    GPIO_InitType GPIO_InitStructure;

    GPIO_InitStruct(&GPIO_InitStructure);
    /* Configure I2C1 pins: SCL and SDA */
    GPIO_InitStructure.Pin        = GPIO_PIN_6 | GPIO_PIN_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_HIGH;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_AF_OD;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF6_I2C1;
    GPIO_InitStructure.GPIO_Pull = GPIO_PULL_UP;
    GPIO_InitPeripheral(GPIOB, &GPIO_InitStructure);

    /* Configure I2C2 pins: SCL and SDA */
    GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF7_I2C2;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
}
