W25Q64是Flash模块，里面保存的数据在掉电后不会丢失，可以看作一个小型移动硬盘。
本实验在SPI收发数据的基础上，增加用该模块存储数据和读取数据的功能。
#include "stm32f10x.h"
#include "delay.h"
uint8_t a = 0;
void App_SPI1_Init(void);//APP表示应用层代码，也就是用户自己写的
void APP_SPI_MasterTransmitReceive(SPI_TypeDef *SPIx, const uint8_t *pDataTx, uint8_t *pDataRx, uint16_t Size);
void App_W25Q64_SaveByte(uint8_t Byte);//Byte提供了要写入的数据
uint8_t App_W25Q64_Load_Byte(void);
int main(void)
{
App_SPI1_Init();
App_W25Q64_SaveByte(0x12);
a = App_W25Q64_Load_Byte();
while(1)//表示不间断去读取
{
}
}
void App_SPI1_Init(void){
//#1.初始化IO引脚
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SPI1, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
//PB3 SCK AF_PP 2MHz
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);
//PB4 MOSI IPU
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStruct);
//PB5 MISO AF_PP 2MHz
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);
//PA15 普通IO Out_PP 2MHz
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
//#2.对SPI本身进行初始化
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
SPI_InitTypeDef SPI_InitStruct;
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
SPI_Init(SPI1, &SPI_InitStruct);
SPI_NSSInternalSoftwareConfig(SPI1, SPI_NSSInternalSoft_Set);//向NSS引脚输入1，接到高电压防止主机被当作从机
}
void APP_SPI_MasterTransmitReceive(SPI_TypeDef *SPIx, const uint8_t *pDataTx, uint8_t *pDataRx, uint16_t Size){
//#1.闭合总开关
SPI_Cmd(SPIx, ENABLE);
//#2.发送第一个字节
SPI_I2S_SendData(SPIx, pDataTx[0]);//若不发第一个字节，RDR中无数据可读，也无法开始接收数据。
//#3.循环Size-1次
for(uint8_t i=0; i<Size-1; i++){
//发送字节（先等待TxE，再循环，直至发到第i+1个字节）
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE)== RESET);
SPI_I2S_SendData(SPIx, pDataTx[i+1]);
//接收字节（先等待RxNE，再循环，直至接收到第i个字节）
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE)== RESET);
pDataRx[i] = SPI_I2S_ReceiveData(SPIx);
}
//#4.接收最后一个字节（第Size-1个）
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE)== RESET);
pDataRx[Size-1] = SPI_I2S_ReceiveData(SPIx);
//#5.断开总开关
SPI_Cmd(SPIx,DISABLE);
}
//存储数据
void App_W25Q64_SaveByte(uint8_t Byte){
uint8_t buffer[10];//声明一个数组
//#1.写使能
buffer[0] = 0x06;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);//NSS=0
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer, 1);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);//NSS=1
//#2.扇区擦除
//主机发0x20 + 24位地址
buffer[0] = 0x20;
buffer[1] = 0x00;
buffer[2] = 0x00;
buffer[3] = 0x00;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer,4);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
//#3.等待空闲
//判断BUSY标志位是否为0
//主机先发送0x05，然后再接收一个字节
while(1){
//发送0x05
buffer[0] = 0x05;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer,1);
//接收一个字节
buffer[0] = 0xff;
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer,1);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
//判断BUSY标志位是否为0,0代表空闲，则跳出循环
if((buffer[0] & 0x01)== 0){
break;
}
}
//#4.写使能
buffer[0] = 0x06;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);//NSS=0
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer, 1);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);//NSS=1
//#5.页编程
//主机发0x02 + 24位地址 + 要发的数据
buffer[0] = 0X02;
buffer[1] = 0X00;
buffer[2] = 0X00;
buffer[3] = 0X00;
buffer[4] = Byte;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer, 5);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
//#6. 等待空闲
while(1){
//发送0x05
buffer[0] = 0x05;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer,1);
//接收一个字节
buffer[0] = 0xff;
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer,1);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
//判断BUSY标志位是否为0,0代表空闲，则跳出循环
if((buffer[0] & 0x01)== 0){
break;
}
}
}
//读取数据
uint8_t App_W25Q64_Load_Byte(void){
//主机发0x03 + 24位地址，然后读取数据
uint8_t buffer[10];//声明一个数组
//主机发0x03 + 24位地址
buffer[0] = 0x03;
buffer[1] = 0X00;
buffer[2] = 0X00;
buffer[3] = 0X00;
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_RESET);
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer, 4);
//读取数据
buffer[0] = 0xff;
APP_SPI_MasterTransmitReceive(SPI1, buffer, buffer, 1);
GPIO_WriteBit(GPIOA, GPIO_Pin_15, Bit_SET);
return buffer[0];
}
