/********************************** (C) COPYRIGHT *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2021/08/08
* Description        : Main program body.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
*******************************************************************************/

/*
 *@Note
 硬件NSS模式，Master/Slave 模式数据收发：
 Master：SPI1_NSS(PA4)、SPI1_SCK(PA5)、SPI1_MISO(PA6)、SPI1_MOSI(PA7)。
 Slave：SPI1_NSS(PA4)、SPI1_SCK(PA5)、SPI1_MISO(PA6)、SPI1_MOSI(PA7)。

 本例程演示在硬件 NSS 模式下，Master 和 Slave 同时全双工收发。
 注：两块板子分别下载 Master 和 Slave 程序，同时上电。
     硬件连线：
               PA5 —— PA5
               PA6 —— PA6
               PA7 —— PA7

*/

#include "debug.h"
#include "string.h"

/* SPI Mode Definition */
#define HOST_MODE   0
#define SLAVE_MODE   1

/* SPI Communication Mode Selection */
#define SPI_MODE   HOST_MODE
//#define SPI_MODE   SLAVE_MODE

/* Global define */
#define Size 18

/* Global Variable */

u16 TxData[Size] = { 0x0101, 0x0202, 0x0303, 0x0404, 0x0505, 0x0606,
                     0x1111, 0x1212, 0x1313, 0x1414, 0x1515, 0x1616,
                     0x2121, 0x2222, 0x2323, 0x2424, 0x2525, 0x2626
                   };
u16 RxData[Size];

/*********************************************************************
 * @fn      SPI_FullDuplex_Init
 *
 * @brief   Configuring the SPI for full-duplex communication.
 *
 * @return  none
 */
void SPI_FullDuplex_Init( void )
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef SPI_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );

#if (SPI_MODE == HOST_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

#elif (SPI_MODE == SLAVE_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

#endif

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

#if (SPI_MODE == HOST_MODE)
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

#elif (SPI_MODE == SLAVE_MODE)
    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

#endif

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init( SPI1, &SPI_InitStructure );

    SPI_SSOutputCmd( SPI1, DISABLE );

    SPI_Cmd( SPI1, ENABLE );
}


/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    u8 i = 0;
    u8 j = 0;
    u8 value;

    Delay_Init();
    USART_Printf_Init( 460800 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );

#if (SPI_MODE == SLAVE_MODE)
    printf( "Slave Mode\r\n" );
    Delay_Ms( 1000 );

#endif

    SPI_FullDuplex_Init();

#if (SPI_MODE == HOST_MODE)
    printf( "Host Mode\r\n" );
    Delay_Ms( 1000 );
    Delay_Ms( 1000 );

#endif

    while( 1 )
    {
        while( ( i < 18 ) || ( j < 18 ) )
        {
            if( i < 18 )
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
                {
                    SPI_I2S_SendData( SPI1, TxData[i] );
                    i++;
                }
            }

            if( j < 18 )
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET )
                {
                    RxData[j] = SPI_I2S_ReceiveData( SPI1 );
                    j++;
                }
            }
        }

        value = memcmp( TxData, RxData, Size );

        if( value == 0 )
        {
            printf( "Same\r\n" );
        }
        else
        {
            printf( "Different\r\n" );
        }

        while( 1 );
    }
}
