71 lines
3.4 KiB
C
71 lines
3.4 KiB
C
/******************** (C) COPYRIGHT 2020 GEEKIMU *******************************
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* File Name : spi.c
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* Current Version : V2.0 & ST 3.5.0
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* Author : zhanli 719901725@qq.com & JustFeng.
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* Date of Issued : 2019.5.22 zhanli : Create
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* Comments : SPI配置和驱动
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********************************************************************************/
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#include "stm32f10x_spi.h"
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#include "spi.h"
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#include "sys.h"
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/**----------------------------------------------------------------------
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* Function : MEMS_SPI_Init
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* Description : 初始化陀螺仪和磁力计的SPI接口
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* Author : zhanli&719901725@qq.com
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* Date : 2019/5/04 zhanli
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*---------------------------------------------------------------------**/
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void MEMS_SPI_Init()
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{
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SPI_InitTypeDef SPI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* 开启GPIOB的时钟以及 SPI2的时钟 */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
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/* 配置SPI的SCK，MISO，MOSI */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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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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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // 设置SPI单向或者双向的数据模式: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; // 设置SPI的数据大小:SPI发送接收8位帧结构
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; // 选择了串行时钟的稳态:时钟悬空高电平
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; // 数据捕获于第一个时钟沿
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
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//SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; // 采用的DK2的参数
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // 采用的9250参数
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // 指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
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SPI_InitStructure.SPI_CRCPolynomial = 7; // CRC值计算的多项式
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SPI_Init(SPI2, &SPI_InitStructure); // 根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
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SPI_Cmd(SPI2, ENABLE); // 使能SPI外设
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}
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/**----------------------------------------------------------------------
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* Function : SPI2_ReadWriteByte
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* Description : 读写SPI2的数据,主要是读写MPU6500 + LIS3MDL的数据
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* Author : zhanli&719901725@qq.com
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* Date : 2015/2/13 zhanli
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*---------------------------------------------------------------------**/
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uint8_t SPI2_ReadWriteByte(uint8_t TxData)
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{
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uint8_t retry = 0;
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET) {
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retry++;
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if(retry>200)return 0;
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}
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SPI_I2S_SendData(SPI2, TxData);
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retry = 0;
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) {
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retry++;
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if(retry>200)return 0;
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}
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return SPI_I2S_ReceiveData(SPI2);
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}
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