106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
#include "spi.h"
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void SPI2_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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SPI_InitTypeDef SPI_InitStructure;
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// /* Enable SCK, MOSI and MISO GPIO clocks */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOB, ENABLE);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//复用
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上啦
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;//时钟速率
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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GPIO_SetBits(GPIOC, GPIO_Pin_6);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
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// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上啦
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;//时钟速率
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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GPIO_SetBits(GPIOB, GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
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// GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_SPI2);//GPIO_PinSource7
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/* SPI configuration -------------------------------------------------------*/
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// SPI_I2S_DeInit(SPI2);
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/* Enable the SPI periph */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI设置为双线双向全双工
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主spi
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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SPI_Init(SPI2, &SPI_InitStructure);
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SPI_Cmd(SPI2, ENABLE); //使能SPI外设
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// SPI2_SetSpeed(1);
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// SPI2_ReadWrite(0xff);//启动传输
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}
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//SPI2速度设置函数
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//SpeedSet:0~7
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//SPI速度=fAPB1/2^(SpeedSet+1)
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//APB1时钟一般为36Mhz
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void SPI2_SetSpeed(u8 SpeedSet)
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{
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SpeedSet&=0X07; //限制范围
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SPI2->CR1&=0XFFC7;
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SPI2->CR1|=SpeedSet<<3; //设置SPI2速度
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SPI2->CR1|=1<<6; //SPI设备使能
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}
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//SPI 速度设置函数
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//SpeedSet:
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//SPI_BaudRatePrescaler_2 2分频 (SPI 36M@sys 72M)
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//SPI_BaudRatePrescaler_8 8分频 (SPI 9M@sys 72M)
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//SPI_BaudRatePrescaler_16 16分频 (SPI 4.5M@sys 72M)
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//SPI_BaudRatePrescaler_256 256分频 (SPI 281.25K@sys 72M)
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//void SPI2_SetSpeed(u8 SpeedSet)
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//{
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// SPI_InitTypeDef SPI_InitStructure;
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//
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// SPI_InitStructure.SPI_BaudRatePrescaler = SpeedSet ;
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// SPI_Init(SPI2, &SPI_InitStructure);
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// SPI_Cmd(SPI2,ENABLE);
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//}
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//SPI2 读写一个字节
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//TxData:要写入的字节
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//返回值:读取到的字节
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u8 SPI2_ReadWriteByte(u8 TxData)
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{
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u16 retry=0;
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while((SPI2->SR&1<<1)==0) //等待发送区空
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{
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retry++;
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if(retry>=0XFFFE)return 0; //超时退出
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}
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SPI2->DR=TxData; //发送一个byte
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retry=0;
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while((SPI2->SR&1<<0)==0) //等待接收完一个byte
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{
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retry++;
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if(retry>=0XFFFE)return 0; //超时退出
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}
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return SPI2->DR; //返回收到的数据
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}
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