88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/*************************** (C) COPYRIGHT 2014 GLHF ****************************
|
||
* 文件名 :spi.h
|
||
* 描 述 :SPI接口驱动程序
|
||
* 版 本 :V1.0
|
||
* 日 期 :2018-11-24
|
||
* 作 者 :XuZhongPing
|
||
* 更新记录 :
|
||
*********************************************************************************/
|
||
#include "spi.h"
|
||
|
||
/*
|
||
* 函数名:SPI1_Init
|
||
* 描述 :ENC28J60 SPI 接口初始化
|
||
* 输入 :无
|
||
* 输出 :无
|
||
* 返回 :无
|
||
*/
|
||
void SPI1_Init(void)
|
||
{
|
||
GPIO_InitTypeDef GPIO_InitStructure;
|
||
SPI_InitTypeDef SPI_InitStructure;
|
||
|
||
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE, ENABLE );
|
||
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1, ENABLE );//SPI1时钟使能
|
||
|
||
//PA5 -> SCK PA6 -> MISO PA7 -> MOSI
|
||
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
|
||
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //PA5/6/7复用推挽输出
|
||
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
|
||
GPIO_Init(GPIOA, &GPIO_InitStructure);
|
||
|
||
/* PC4-SPI1-NSS:SD-CS */ // 片选
|
||
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
|
||
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
|
||
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // 推免输出
|
||
GPIO_Init(GPIOE, &GPIO_InitStructure);
|
||
GPIO_SetBits(GPIOE, GPIO_Pin_8); // 先把片选拉高,真正用的时候再拉低
|
||
|
||
/* PA4-SPI1-NSS:FLASH-CS */ // 片选
|
||
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
|
||
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
|
||
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // 推免输出
|
||
GPIO_Init(GPIOE, &GPIO_InitStructure);
|
||
GPIO_SetBits(GPIOE, GPIO_Pin_7); // 先把片选拉高,真正用的时候再拉低
|
||
|
||
|
||
/* SPI1 配置 */
|
||
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_64;
|
||
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
|
||
SPI_InitStructure.SPI_CRCPolynomial = 7;
|
||
SPI_Init(SPI1, &SPI_InitStructure);
|
||
|
||
/* 使能 SPI1 */
|
||
SPI_Cmd(SPI1, ENABLE);
|
||
}
|
||
|
||
/*
|
||
* 函数名:SPI1_ReadWrite
|
||
* 描述 :SPI1读写一字节数据
|
||
* 输入 :
|
||
* 输出 :
|
||
* 返回 :SPI1_ReadWriteByte
|
||
*/
|
||
uint8_t SPI1_ReadWriteByte(uint8_t writedat)
|
||
{
|
||
uint8_t retry=0;
|
||
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //检查指定的SPI标志位设置与否:发送缓存空标志位
|
||
{
|
||
retry++;
|
||
if(retry>200)return 0;
|
||
}
|
||
SPI_I2S_SendData(SPI1, writedat); //通过外设SPIx发送一个数据
|
||
retry=0;
|
||
|
||
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) //检查指定的SPI标志位设置与否:接受缓存非空标志位
|
||
{
|
||
retry++;
|
||
if(retry>200)return 0;
|
||
}
|
||
return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
|
||
}
|