1.SPI初始化
cpp
#include "stm32f10x.h" // Device header
void MySPI_W_SS(uint8_t BitValue)//片选
{
GPIO_WriteBit(GPIOA,GPIO_Pin_4,(BitAction)BitValue);
}
void MySPI_W_SCK(uint8_t BitValue)//时钟线
{
GPIO_WriteBit(GPIOA,GPIO_Pin_5,(BitAction)BitValue);
}
void MySPI_W_MOSI(uint8_t BitValue)//MOSI
{
GPIO_WriteBit(GPIOA,GPIO_Pin_7,(BitAction)BitValue);
}
uint8_t MySPI_R_MISO(void)//MISO
{
return(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_6));
}
void MySPI_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 |GPIO_Pin_7;//输出脚，配置成推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;//输入脚，配置成上拉输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
MySPI_W_SS(1);//片选默认高电平
MySPI_W_SCK(0);//时钟线默认为0
}
void MySPI_Start(void)
{
MySPI_W_SS(0);//片选低电平
}
void MySPI_Stop(void)
{
MySPI_W_SS(1);//片选高电平
}
uint8_t MySPI_BitSend(uint8_t Data)//交换数据
{
uint8_t i,BitReivce = 0x00;//接收数据默认为0x00
for(i=0;i<8;i++)
{
MySPI_W_MOSI(Data & (0x80>>i));//此时模式为模式0，因为低电平将数据放入SCk，高电平读取数据
MySPI_W_SCK(1);
if(MySPI_R_MISO()== 1){BitReivce |= (0x80>>i);}//该语句首先判断接收到的位是否为1，通过|=来提出该位的1，否则为零
MySPI_W_SCK(0);
}
return BitReivce;
}完成SPI基本时序单元，包括起始条件，终止条件，交换一个字节。为了方便放标操作，封装了一些函数。
2.1基于SPI的W25Q64初始化
根据W25Q64指令表实现相关指令
cpp
#include "stm32f10x.h" // Device header
#include "MySPI.h"
#include "W25Q64_Ins.h"
void MyW25Q64_Init(void)
{
MySPI_Init();
}
void MyW25Q64_GetID(uint8_t *MID,uint16_t *DID)//获取id
{
MySPI_Start();
MySPI_BitSend(W25Q64_JEDEC_ID);//命令码参考W25Q64_Ins头文件，发送命令码
*MID = MySPI_BitSend(W25Q64_DUMMY_BYTE);
*DID = MySPI_BitSend(W25Q64_DUMMY_BYTE);
*DID <<= 8;
*DID |= MySPI_BitSend(W25Q64_DUMMY_BYTE);//关键点，高八位低八位的处理方法
MySPI_Stop();
}
//该ID为两组数据，其中前8位为厂家ID，后16位为设备ID，注意这里对16位数据的处理方式，通过该语句*DID <<= 8;将数据置为高8位
//然后通过该语句*DID |= MySPI_BitSend(W25Q64_DUMMY_BYTE);将低8位存入指针，注意这里是|=
void MyW25Q64_WriteEnable(void)//写入使能
{
MySPI_Start();
MySPI_BitSend(W25Q64_WRITE_ENABLE);
MySPI_Stop();
}
void W25Q64_WaitBusy(void)//等待忙
{
uint32_t Timeout = 10000;//防止卡死
MySPI_Start();
MySPI_BitSend(W25Q64_READ_STATUS_REGISTER_1);//发送命令代码
while((MySPI_BitSend(W25Q64_DUMMY_BYTE)& 0x01) == 0x01)//随意发送数据，获取返回值并取出最后一位，也就是Busy位检查是否为1,1表示忙，循环等待，直到忙结束，跳出循环
{
Timeout --;
if(Timeout==0)
{
break;
}
}
MySPI_Stop();
}
void W25Q64_PageProgram(uint32_t Adress,uint8_t *DataArray,uint16_t Count)//写入操作
{
uint16_t i;
MyW25Q64_WriteEnable();//写入使能
MySPI_Start();
MySPI_BitSend(W25Q64_PAGE_PROGRAM);
MySPI_BitSend(Adress<<16);
MySPI_BitSend(Adress<<8);
MySPI_BitSend(Adress);//将24位地址三次发送
for(i=0;i<Count;i++)
{
MySPI_BitSend(DataArray[i]);//发送数据
}
MySPI_Stop();
W25Q64_WaitBusy();//等待忙碌结束
}
void W25Q64_SectorErase(uint32_t Adress)//擦除
{
W25Q64_WaitBusy();
MySPI_Start();
MySPI_BitSend(W25Q64_SECTOR_ERASE_4KB);
MySPI_BitSend(Adress<<16);
MySPI_BitSend(Adress<<8);
MySPI_BitSend(Adress);
MySPI_Stop();
W25Q64_WaitBusy();
}
void W25Q64_ReadDate(uint32_t Adress,uint8_t *DataArray ,uint32_t Count)
{
uint32_t i;
MySPI_Start();
MySPI_BitSend(W25Q64_READ_DATA);
MySPI_BitSend(Adress<<16);
MySPI_BitSend(Adress<<8);
MySPI_BitSend(Adress);
for(i=0;i<Count;i++)
{
DataArray[i] = MySPI_BitSend(W25Q64_DUMMY_BYTE);//数据接收
}
MySPI_Stop();
W25Q64_WaitBusy();
}为了方便程序的读写，对W25Q64的指令做宏定义，增加程序的可读性
2.2W25Q64头文件
cpp
#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
#endif3.main函数实验
cpp
#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "OLED.h"
#include "MyW25Q64.h"
uint8_t DataArray[4] = {0x01,0x02,0x03,0x04};//写入数据注意不要超过256个，超出新数据会覆盖地址开头数据
uint8_t ArrayRead[4];//读数据没有个数限制
uint8_t MID;
uint16_t DID;
int main(void)
{
OLED_Init();
MyW25Q64_Init();
MyW25Q64_GetID(&MID,&DID);
OLED_ShowString(1, 1, "MID: DID:");
OLED_ShowString(2, 1, "W:");
OLED_ShowString(3, 1, "R:");
OLED_ShowHexNum(1, 5, MID, 2);
OLED_ShowHexNum(1, 12, DID, 4);
W25Q64_SectorErase( 0x00000);
W25Q64_PageProgram(0x00000,DataArray,4);//数据写入地址0x00000处，内容为数组DataArray的数据
W25Q64_ReadDate(0x00000,ArrayRead,4);//读取地址0x00000处数据
OLED_ShowHexNum(2, 3, DataArray[0], 2);
OLED_ShowHexNum(2, 6, DataArray[1], 2);
OLED_ShowHexNum(2, 9, DataArray[2], 2);
OLED_ShowHexNum(2, 12, DataArray[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)
{
}
}4.功能实现
