SPI通信外设
SPI外设简介
SPI框图
SPI基本结构
主模式全双工连续传输
非连续传输
软件/硬件波形对比
硬件SPI读写W25Q64
接线图
代码
MySPI.c
#include "stm32f10x.h" // Device header
void MySPI_W_SS(uint8_t BitValue)
{
GPIO_WriteBit(GPIOA,GPIO_Pin_4,(BitAction)BitValue);
}
void MySPI_Init(void) //SPI模式0
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_4;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStruct);
SPI_InitTypeDef SPI_InitStruct;
SPI_InitStruct.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_128; //分频
SPI_InitStruct.SPI_CPHA=SPI_CPHA_1Edge; //时钟相位:第一个边沿采样数据
SPI_InitStruct.SPI_CPOL=SPI_CPOL_Low; //时钟极性:空闲时间,SCK=0
SPI_InitStruct.SPI_CRCPolynomial=7; //CRC校验多项式
SPI_InitStruct.SPI_DataSize=SPI_DataSize_8b; //8位数据帧
SPI_InitStruct.SPI_Direction=SPI_Direction_2Lines_FullDuplex; //双线全双工
SPI_InitStruct.SPI_FirstBit=SPI_FirstBit_MSB; //高位先行
SPI_InitStruct.SPI_Mode=SPI_Mode_Master; //主机
SPI_InitStruct.SPI_NSS=SPI_NSS_Soft; //软件从机选择
SPI_Init(SPI1,&SPI_InitStruct);
SPI_Cmd(SPI1,ENABLE);
MySPI_W_SS(1);
}
void MySPI_Start(void)
{
MySPI_W_SS(0);
}
void MySPI_Stop(void)
{
MySPI_W_SS(1);
}
uint8_t MySPI_SwapByte(uint8_t ByteSend) //交换一个字节
{
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)!=SET);
SPI_I2S_SendData(SPI1,ByteSend);
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)!=SET);
return SPI_I2S_ReceiveData(SPI1);
}
MySPI.h
#ifndef __MYSPI_H__
#define __MYSPI_H__
void MySPI_Init(void);
void MySPI_Start(void);
void MySPI_Stop(void);
uint8_t MySPI_SwapByte(uint8_t ByteSend);
#endif
W25Q64.c
#include "stm32f10x.h" // Device header
#include "MySPI.h"
#include "W25Q64_Ins.h"
#include "W25Q64.h"
void W25Q64_Init(void)
{
MySPI_Init();
}
void W25Q64_ReadID(uint8_t *MID, uint16_t *DID) //厂商ID 设备ID
{
MySPI_Start();
MySPI_SwapByte(W25Q64_JEDEC_ID);
*MID=MySPI_SwapByte(W25Q64_DUMMY_BYTE);
*DID=MySPI_SwapByte(W25Q64_DUMMY_BYTE);
*DID<<=8;
*DID|=MySPI_SwapByte(W25Q64_DUMMY_BYTE);
MySPI_Stop();
}
void W25Q64_WriteEnable(void)
{
MySPI_Start();
MySPI_SwapByte(W25Q64_WRITE_ENABLE); //写使能
MySPI_Stop();
}
void W25Q64_WaitBusy(void)
{
uint32_t Timeout=100000; //超时时间
MySPI_Start();
MySPI_SwapByte(W25Q64_READ_STATUS_REGISTER_1);
while((MySPI_SwapByte(W25Q64_DUMMY_BYTE)&0x01)==0x01) //等待BUSY为0
{
Timeout--;
if(Timeout==0)
{
break;
}
}
MySPI_Stop();
}
void W25Q64_PageProgram(uint32_t Address,uint8_t *DataArray,uint16_t Count) //数组页写入
{
W25Q64_WaitBusy();
W25Q64_WriteEnable();
MySPI_Start();
MySPI_SwapByte(W25Q64_PAGE_PROGRAM);
MySPI_SwapByte(Address>>16);
MySPI_SwapByte(Address>>8);
MySPI_SwapByte(Address);
for(int8_t i=0;i<Count;i++)
{
MySPI_SwapByte(DataArray[i]);
}
MySPI_Stop();
}
void W25Q64_SectorErase(uint32_t Address) //扇区擦除(4KB)
{
W25Q64_WaitBusy();
W25Q64_WriteEnable();
MySPI_Start();
MySPI_SwapByte(W25Q64_SECTOR_ERASE_4KB);
MySPI_SwapByte(Address>>16);
MySPI_SwapByte(Address>>8);
MySPI_SwapByte(Address);
MySPI_Stop();
}
void W25Q64_ReadData(uint32_t Address,uint8_t *DataArray,uint32_t Count) //读取数据
{
W25Q64_WaitBusy();
MySPI_Start();
MySPI_SwapByte(W25Q64_READ_DATA);
MySPI_SwapByte(Address>>16);
MySPI_SwapByte(Address>>8);
MySPI_SwapByte(Address);
for(uint32_t i=0;i<Count;i++)
{
DataArray[i]=MySPI_SwapByte(W25Q64_DUMMY_BYTE);
}
MySPI_Stop();
}
W25Q64.h
#ifndef __W25Q64_H__
#define __W25Q64_H__
void W25Q64_Init(void);
void W25Q64_ReadID(uint8_t *MID, uint16_t *DID);
void W25Q64_WriteEnable(void);
void W25Q64_WaitBusy(void);
void W25Q64_PageProgram(uint32_t Address,uint8_t *DataArray,uint16_t Count);
void W25Q64_SectorErase(uint32_t Address);
void W25Q64_ReadData(uint32_t Address,uint8_t *DataArray,uint32_t Count);
#endif
W25Q64_Ins.h
#ifndef __W25Q64_INS_H__
#define __W25Q64_INS_H__
#define W25Q64_WRITE_ENABLE 0x06
#define W25Q64_WRITE_DISABLE 0x04
#define W25Q64_READ_STATUS_REGISTER_1 0x05
#define W25Q64_READ_STATUS_REGISTER_2 0x35
#define W25Q64_WRITE_STATUS_REGISTER 0x01
#define W25Q64_PAGE_PROGRAM 0x02
#define W25Q64_QUAD_PAGE_PROGRAM 0x32
#define W25Q64_BLOCK_ERASE_64KB 0xD8
#define W25Q64_BLOCK_ERASE_32KB 0x52
#define W25Q64_SECTOR_ERASE_4KB 0x20
#define W25Q64_CHIP_ERASE 0xC7
#define W25Q64_ERASE_SUSPEND 0x75
#define W25Q64_ERASE_RESUME 0x7A
#define W25Q64_POWER_DOWN 0xB9
#define W25Q64_HIGH_PERFORMANCE_MODE 0xA3
#define W25Q64_CONTINUOUS_READ_MODE_RESET 0xFF
#define W25Q64_RELEASE_POWER_DOWN_HPM_DEVICE_ID 0xAB
#define W25Q64_MANUFACTURER_DEVICE_ID 0x90
#define W25Q64_READ_UNIQUE_ID 0x4B
#define W25Q64_JEDEC_ID 0x9F
#define W25Q64_READ_DATA 0x03
#define W25Q64_FAST_READ 0x0B
#define W25Q64_FAST_READ_DUAL_OUTPUT 0x3B
#define W25Q64_FAST_READ_DUAL_IO 0xBB
#define W25Q64_FAST_READ_QUAD_OUTPUT 0x6B
#define W25Q64_FAST_READ_QUAD_IO 0xEB
#define W25Q64_OCTAL_WORD_READ_QUAD_IO 0xE3
#define W25Q64_DUMMY_BYTE 0xFF
#endif
main.c
#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "OLED.h"
#include "W25Q64.h"
uint8_t MID;
uint16_t DID;
uint8_t ArrayWrite[]={0x01,0x02,0x03,0x04};
uint8_t ArrayRead[4];
int main(void)
{
OLED_Init();
W25Q64_Init();
OLED_ShowString(1,1,"MID: DID: ");
OLED_ShowString(2,1,"W: ");
OLED_ShowString(3,1,"R: ");
W25Q64_ReadID(&MID,&DID);
OLED_ShowHexNum(1,5,MID,2);
OLED_ShowHexNum(1,12,DID,4);
W25Q64_SectorErase(0x000000);
W25Q64_PageProgram(0x000000,ArrayWrite,4);
W25Q64_ReadData(0x000000,ArrayRead,4);
OLED_ShowHexNum(2,3,ArrayWrite[0],2);
OLED_ShowHexNum(2,6,ArrayWrite[1],2);
OLED_ShowHexNum(2,9,ArrayWrite[2],2);
OLED_ShowHexNum(2,12,ArrayWrite[3],2);
OLED_ShowHexNum(3,3,ArrayRead[0],2);
OLED_ShowHexNum(3,6,ArrayRead[1],2);
OLED_ShowHexNum(3,9,ArrayRead[2],2);
OLED_ShowHexNum(3,12,ArrayRead[3],2);
while(1)
{
}
}