189 lines
6.1 KiB
C
189 lines
6.1 KiB
C
#include "spi.h"
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//////////////////////////////////////////////////////////////////////////////////
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//本程序只供学习使用，未经作者许可，不得用于其它任何用途
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//ALIENTEK精英STM32开发板
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//SPI驱动 代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//修改日期:2012/9/9
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//版本：V1.0
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//版权所有，盗版必究。
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//Copyright(C) 广州市星翼电子科技有限公司 2009-2019
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//All rights reserved
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//////////////////////////////////////////////////////////////////////////////////
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//以下是SPI模块的初始化代码，配置成主机模式，访问SD Card/W25Q64/NRF24L01
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//SPI口初始化
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//这里针是对SPI1的初始化
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#include "stdio.h"
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#include "string.h"
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#include "stm32f10x.h"
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#include "stm32f10x_spi.h"
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#include "spi.h"
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u8 SPI2_ReadWriteByte(u8 TxData);
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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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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );//PORTB时钟使能
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2, ENABLE );//SPI2时钟使能
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//控制SPI 有输入输出片选还有时钟，这里怎么体现？
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//PB13、 14、 15 这 3 个（ SCK.、 MISO、 MOSI， CS 使用软件管理方式），所以设置这三
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//个为复用 IO
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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; //PB13/14/15复用推挽输出
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
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GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); //内部将PB13/14/15上拉
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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; //串行同步时钟的空闲状态为高电平
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //串行同步时钟的第二个跳变沿（上升或下降）数据被采样
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//触发方式对SD卡的检测影响深远
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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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//NSS由软件管理
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定义波特率预分频的值:波特率预分频值为256
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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，7位CRC校验
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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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SPI2_ReadWriteByte(0xff);//启动传输 ？
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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
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//SPI_BaudRatePrescaler_8 8分频
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//SPI_BaudRatePrescaler_16 16分频
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//SPI_BaudRatePrescaler_256 256分频
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void SPI2_SetSpeed(u8 SPI_BaudRatePrescaler)
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{
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assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
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SPI2->CR1&=0XFFC7;
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SPI2->CR1|=SPI_BaudRatePrescaler; //设置SPI2速度
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SPI_Cmd(SPI2,ENABLE);
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}
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//SPIx 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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u8 retry=0;
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while (SPI_I2S_GetFlagStatus(SPI2, 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
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{
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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); //通过外设SPIx发送一个数据
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retry=0;
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while (SPI_I2S_GetFlagStatus(SPI2, 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
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{
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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); //返回通过SPIx最近接收的数据
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}
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void SPI1_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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RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOA, ENABLE );//PORTA????
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1, ENABLE );//SPI1????
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //PA.5/6/7
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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// GPIO_SetBits(GPIOA,GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7); ////PA.5/6/7=1
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
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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(SPI1, &SPI_InitStructure);
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SPI_Cmd(SPI1, ENABLE); //
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SPI1_ReadWriteByte(0xff);
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}
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//SPI
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//SpeedSet:
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//SPI_BaudRatePrescaler_2 2??
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//SPI_BaudRatePrescaler_8 8??
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//SPI_BaudRatePrescaler_16 16??
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//SPI_BaudRatePrescaler_256 256??
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void SPI1_SetSpeed(u8 SPI_BaudRatePrescaler)
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{
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assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
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SPI1->CR1&=0XFFC7;
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SPI1->CR1|=SPI_BaudRatePrescaler;
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SPI_Cmd(SPI1,ENABLE);
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}
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u8 SPI1_ReadWriteByte(u8 TxData)
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{
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u16 retry=0;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
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{
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retry++;
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if(retry>2000)return 0;
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}
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SPI_I2S_SendData(SPI1, TxData);
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retry=0;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
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{
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retry++;
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if(retry>2000)return 0;
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}
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return SPI_I2S_ReceiveData(SPI1);
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}
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