软件SPI读写W25Q64

【stm32】软件SPI读写W25Q64

编码

首先建立MySPI模块

1. 输出引脚配置为推挽输出，输入引脚配置为浮空或上拉输入

2. 包装四个SPI通信引脚

3. 在初始化函数里，SS默认高电平，SCK默认是低电平

4. 接下来开始写SPI的三个时序基本单元

   1. 开始函数

   2. 停止函数

   3. 交换一个字节

建立W25Q64模块

1. 调用MySPI

2. 参考手册指令集部分

   1. 比如要获取读ID号的指令

      1. 起始

      2. 先交换发送指令9F，随后连续交换接收三个字节（在括号“()”中的字节字段表示从设备上的DO引脚读取的数据。）

      3. 停止

3. 规定

   1. SPI起始之后第一个字节都是指令码

4. 编写等待忙函数

   1. 读取状态寄存器1的最后一位

   2. 判断是不是1，等待忙

5. 编写页编程

   1. 形参，32位地址、数组数据、Count(由于页编程最多依次写入256个字节数据，所以Count定义为16位，如果定义8位的，只能到255)

MySPI.c

#include "stm32f10x.h"                  // Device header

void MySPI_W_SS(uint8_t BitValue)
{
	GPIO_WriteBit(GPIOA, GPIO_Pin_4, (BitAction)BitValue);
}

void MySPI_W_SCK(uint8_t BitValue)
{
	GPIO_WriteBit(GPIOA, GPIO_Pin_5, (BitAction)BitValue);
}

void MySPI_W_MOSI(uint8_t BitValue)
{
	GPIO_WriteBit(GPIOA, GPIO_Pin_7, (BitAction)BitValue);
}

uint8_t MySPI_R_MISO(void)
{
	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;
	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;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	MySPI_W_SS(1);
	MySPI_W_SCK(0);
}

void MySPI_Start(void)
{
	MySPI_W_SS(0);
}

void MySPI_Stop(void)
{
	MySPI_W_SS(1);
}

uint8_t MySPI_SwapByte(uint8_t ByteSend)
{
	uint8_t i, ByteReceive = 0x00;
	
	for (i = 0; i < 8; i ++)
	{
		MySPI_W_MOSI(ByteSend & (0x80 >> i));
		MySPI_W_SCK(1);
		if (MySPI_R_MISO() == 1){ByteReceive |= (0x80 >> i);}
		MySPI_W_SCK(0);
	}
	
	return ByteReceive;
}

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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

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W25Q64.c

#include "stm32f10x.h"                  // Device header
#include "MySPI.h"
#include "W25Q64_Ins.h"

void W25Q64_Init(void)
{
	MySPI_Init();
}

void W25Q64_ReadID(uint8_t *MID, uint16_t *DID)
{
	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);
	MySPI_Stop();
}

void W25Q64_WaitBusy(void)
{
	uint32_t Timeout;
	MySPI_Start();
	MySPI_SwapByte(W25Q64_READ_STATUS_REGISTER_1);
	Timeout = 100000;
	while ((MySPI_SwapByte(W25Q64_DUMMY_BYTE) & 0x01) == 0x01)
	{
		Timeout --;
		if (Timeout == 0)
		{
			break;
		}
	}
	MySPI_Stop();
}

void W25Q64_PageProgram(uint32_t Address, uint8_t *DataArray, uint16_t Count)
{
	uint16_t i;
	
	W25Q64_WriteEnable();
	
	MySPI_Start();
	MySPI_SwapByte(W25Q64_PAGE_PROGRAM);
	MySPI_SwapByte(Address >> 16);
	MySPI_SwapByte(Address >> 8);
	MySPI_SwapByte(Address);
	for (i = 0; i < Count; i ++)
	{
		MySPI_SwapByte(DataArray[i]);
	}
	MySPI_Stop();
	
	W25Q64_WaitBusy();
}

void W25Q64_SectorErase(uint32_t Address)
{
	W25Q64_WriteEnable();
	
	MySPI_Start();
	MySPI_SwapByte(W25Q64_SECTOR_ERASE_4KB);
	MySPI_SwapByte(Address >> 16);
	MySPI_SwapByte(Address >> 8);
	MySPI_SwapByte(Address);
	MySPI_Stop();
	
	W25Q64_WaitBusy();
}

void W25Q64_ReadData(uint32_t Address, uint8_t *DataArray, uint32_t Count)
{
	uint32_t i;
	MySPI_Start();
	MySPI_SwapByte(W25Q64_READ_DATA);
	MySPI_SwapByte(Address >> 16);
	MySPI_SwapByte(Address >> 8);
	MySPI_SwapByte(Address);
	for (i = 0; i < Count; i ++)
	{
		DataArray[i] = MySPI_SwapByte(W25Q64_DUMMY_BYTE);
	}
	MySPI_Stop();
}

//void W25Q64_WriteStatus(void)
//{
//    W25Q64_WriteEnable(); //写使能
//    
//    MySPI_Start();
//    MySPI_SwapByte(W25Q64_WRITE_STATUS_REGISTER); //发送写状态寄存器的指令
//    MySPI_SwapByte(0x00); //写入状态寄存器1
//    MySPI_SwapByte(0x00); //写入状态寄存器2
//    MySPI_Stop();
//    
//    W25Q64_WaitBusy();  //等待忙
//}

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W25Q64.h

#ifndef __W25Q64_H
#define __W25Q64_H

void W25Q64_Init(void);
void W25Q64_ReadID(uint8_t *MID, uint16_t *DID);
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);
//void W25Q64_WriteStatus(void);

#endif

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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

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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();
//	W25Q64_WriteStatus();
	
	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)
	{
		
	}
}

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