dtu_lan_gateway/app/HARDWARE/sources/spi.c

#include "spi.h"


void SPI2_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable SPI2 and GPIO clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
		
		 /* Configure SPI2 CS pin */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    /* Configure SPI2 pins: SCK, MISO and MOSI */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    /* Connect GPIO pins to SPI2 alternate function */
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2); // SCK
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2); // MISO
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2); // MOSI
}

void spi_config(void)
{
		SPI2_GPIO_Config();
    SPI_InitTypeDef SPI_InitStructure;

    /* SPI2 configuration */
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    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_256;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI2, &SPI_InitStructure);

    /* Enable SPI2 */
    SPI_Cmd(SPI2, ENABLE);
}
/*-------------------------------------------------*/
/*函数名：SPI收发一个字节                          */
/*参  数：txd：要发送的数据                        */
/*返回值：接收到的数据                             */
/*-------------------------------------------------*/
uint8_t SPI2_ReadWriteByte(uint8_t txd)
{
	while(SPI_GetFlagStatus(SPI2,SPI_FLAG_TXE)!=1);  
	SPI_SendData(SPI2,txd);                                   
	while(SPI_GetFlagStatus(SPI2,SPI_FLAG_RXNE)!=1); 
	return SPI_ReceiveData(SPI2);              
}

void SpiNSSEnable( uint8_t status )
{
    GPIO_WriteBit( GPIOB, GPIO_Pin_12, (BitAction) status );
}