/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * Description        : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for 
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/

/*
 *@Note
 two-wire full duplex mode, master/slave mode, data transceiver:
 Master:SPI1_SCK(PA5)\SPI1_MISO(PA6)\SPI1_MOSI(PA7).
 Slave:SPI1_SCK(PA5)\SPI1_MISO(PA6)\SPI1_MOSI(PA7).
 
 This example demonstrates simultaneous full-duplex transmission and
 reception between Master and Slave.
 Note: The two boards download the Master and Slave programs respectively,
 and power on at the same time.
    Hardware connection: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_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_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_Soft;
	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_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(2000);

#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);
	}
}
