#include "stm32f10x.h"                  // Device header

void MySPI2_W_SS(uint8_t BitValue)
{
	GPIO_WriteBit(GPIOB, GPIO_Pin_12, (BitAction)BitValue);
}

void MySPI2_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	SPI_InitTypeDef SPI_InitStructure;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI1, &SPI_InitStructure);
	
	SPI_Cmd(SPI1, ENABLE);
	
	MySPI2_W_SS(1);
}

void MySPI2_Start(void)
{
	MySPI2_W_SS(0);
}

void MySPI2_Stop(void)
{
	MySPI2_W_SS(1);
}

uint8_t MySPI2_SwapByte(uint8_t ByteSend)
{
	while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) != SET);
	
	SPI_I2S_SendData(SPI2, ByteSend);
	
	while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) != SET);
	
	return SPI_I2S_ReceiveData(SPI2);
}