/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * SPDX-License-Identifier: Apache-2.0
 *******************************************************************************/ 

/*
 *@Note
 单线半双工模式，Master/Slave 模式数据收发：
 Master：SPI1_SCK(PA5)、SPI1_MOSI(PA7)。
 Slave：SPI1_SCK(PA5)、SPI1_MISO(PA6)。

 本例程演示 Master 发，Slave 收。
 注：两块板子分别下载 Master 和 Slave 程序，同时上电。
     硬件连线：PA5 —— PA5
	           PA7 —— PA6

*/

#include "debug.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 */
u8 Txval = 0, Rxval = 0;

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_1Lines_HalfDuplex_Init
 *
 * @brief   Configuring the SPI for half-duplex communication.
 *
 * @return  none
 */
void SPI_1Lines_HalfDuplex_Init( void )
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef SPI_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );

#if (SPI_MODE == HOST_MODE)
    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_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_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_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
#endif


#if (SPI_MODE == HOST_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

#elif (SPI_MODE == SLAVE_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

#endif

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init( SPI1, &SPI_InitStructure );

    NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init( &NVIC_InitStructure );

#if (SPI_MODE == SLAVE_MODE)
    SPI_I2S_ITConfig( SPI1, SPI_I2S_IT_RXNE, ENABLE );

#endif

    SPI_Cmd( SPI1, ENABLE );
}

/*********************************************************************
 * @fn      SPI1_IRQHandler
 *
 * @brief   This function handles SPI1 exception.
 *
 * @return  none
 */
void SPI1_IRQHandler( void )
{
#if (SPI_MODE == HOST_MODE)
    if( SPI_I2S_GetITStatus( SPI1, SPI_I2S_IT_TXE ) != RESET )
    {
        SPI_I2S_SendData( SPI1, TxData[Txval++] );
        if( Txval == 18 )
        {
            SPI_I2S_ITConfig( SPI1, SPI_I2S_IT_TXE, DISABLE );
        }
    }

#elif (SPI_MODE == SLAVE_MODE)
    RxData[Rxval++] = SPI_I2S_ReceiveData( SPI1 );

#endif
}

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

    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
    Delay_Init();
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );

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

#endif
    SPI_1Lines_HalfDuplex_Init();

#if (SPI_MODE == HOST_MODE)
    printf( "HOST Mode\r\n" );
    Delay_Ms( 2000 );
    SPI_I2S_ITConfig( SPI1, SPI_I2S_IT_TXE, ENABLE );

#endif

    while( 1 )
    {
#if (SPI_MODE == HOST_MODE)
        while( Txval < 18 );

        while( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
        {
            if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_BSY ) == RESET )
            {
                SPI_Cmd( SPI1, DISABLE );
                while( 1 );
            }
        }

#elif (SPI_MODE == SLAVE_MODE)
        while( Rxval < 18 );

        for( i = 0; i < 18; i++ ){
            printf( "Rxdata:%04x\r\n", RxData[i] );
        }

        while( 1 );

#endif
    }
}

