spi.c

来自「STM32F103VBT6连接网络芯片ENC28J60的例子」· C语言 代码 · 共 50 行

#include "includes.h"

//SPI1初始化
void	SPI1_Init(void)
	{
	SPI_InitTypeDef  SPI_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	
	/* Enable SPI1 and GPIOA clocks */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
	
	/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	/* SPI1 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_4;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI1, &SPI_InitStructure);
	
	/* Enable SPI1  */
	SPI_Cmd(SPI1, ENABLE); 
	}

//SPI1读写一字节数据
INT8U	SPI1_ReadWrite(INT8U writedat)
	{
	/* Loop while DR register in not emplty */
	while(SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
	
	/* Send byte through the SPI1 peripheral */
	SPI_SendData(SPI1, writedat);
	
	/* Wait to receive a byte */
	while(SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
	
	/* Return the byte read from the SPI bus */
	return SPI_ReceiveData(SPI1);
	}