stm32使用SPI写W25Q32

SPI.h

#ifndef __SPI_H
#define __SPI_H#include "stm32f10x.h"#define SPI_CS_H GPIO_SetBits(GPIOB, GPIO_Pin_12)
#define SPI_CS_L GPIO_ResetBits(GPIOB, GPIO_Pin_12)#define SPI_SCK_H GPIO_SetBits(GPIOB, GPIO_Pin_13)
#define SPI_SCK_L GPIO_ResetBits(GPIOB, GPIO_Pin_13)#define SPI_MISO_H GPIO_SetBits(GPIOB, GPIO_Pin_14)
#define SPI_MISO_L GPIO_ResetBits(GPIOB, GPIO_Pin_14)#define SPI_MOSI_H GPIO_SetBits(GPIOB, GPIO_Pin_15)
#define SPI_MOSI_L GPIO_ResetBits(GPIOB, GPIO_Pin_15)#define READDATALENGTH 255void SPI_GPIO_Init(void);
uint8_t SPI_WriteRead_Byte(uint8_t byte);void Write_Enable(void);
void Write_Disable(void);
uint8_t Read_StatusR1(void);
uint8_t* Read_Data(uint8_t addr2, uint8_t addr1, uint8_t addr0, uint8_t num2read);void Page_Program(uint8_t addr2, uint8_t addr1, uint8_t addr0, uint8_t *data);
void Sector_Erase(void);#endif

SPI.C

#include "spi.h"void SPI_GPIO_Init(void)
{//SPI2-NSS PB12:PIN25 --CS//SPI2-SCK PB13:PIN26//SPI2-MISO PB14:PIN27     W25Q32:DO//SPI2-MOSI PB15:PIN28     W25Q32:DI
GPIO_InitTypeDef    GPIO_InitStruct;  SPI_InitTypeDef    SPI_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStruct.GPIO_Pin =  GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStruct);GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12;GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStruct);SPI_CS_H;
//    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
//    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_14;
//    
//    GPIO_Init(GPIOB, &GPIO_InitStruct);
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;SPI_InitStruct.SPI_CRCPolynomial = 7;SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;SPI_InitStruct.SPI_Mode = SPI_Mode_Master;SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;SPI_Init(SPI2, &SPI_InitStruct);SPI_Cmd(SPI2, ENABLE);}uint8_t SPI_WriteRead_Byte(uint8_t byte)
{SPI_I2S_SendData(SPI2, byte);while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);return SPI_I2S_ReceiveData(SPI2);
}void Write_Enable(void)
{SPI_CS_L;SPI_WriteRead_Byte(0x06); //set WEL bit 1
    SPI_CS_H;}//一般不需要调用，编程或是擦除操作，WEL会自动清零
void Write_Disable(void)
{SPI_CS_L;SPI_WriteRead_Byte(0x04); //set WEL bit 0
    SPI_CS_H;
}//判断忙标志
uint8_t Read_StatusR1(void)
{uint8_t res = 0;SPI_CS_L;SPI_WriteRead_Byte(0x05); //S0 BUSY bit 1: busy ;    S0 BUSY bit 0: free ;res = SPI_WriteRead_Byte(0x05);SPI_CS_H;if((res & 0x01)== 0x01){return 1;}else{return 0;}
}//读1/2个字节数据
uint8_t* Read_Data(uint8_t addr2, uint8_t addr1, uint8_t addr0, uint8_t num2read)
{static uint8_t res[READDATALENGTH] = {0};uint8_t i = 0;SPI_CS_L;SPI_WriteRead_Byte(0x03);SPI_WriteRead_Byte(addr2);SPI_WriteRead_Byte(addr1);SPI_WriteRead_Byte(addr0);for(i = 0; i < num2read; i ++){res[i] = SPI_WriteRead_Byte(0xff);    }SPI_CS_H;return res;
}void Page_Program(uint8_t addr2, uint8_t addr1, uint8_t addr0, uint8_t *data)
{Write_Enable();SPI_CS_L;SPI_WriteRead_Byte(0x02);//02H页写
SPI_WriteRead_Byte(addr2);//设定写入数据的起始地址
      SPI_WriteRead_Byte(addr1);SPI_WriteRead_Byte(addr0);//      SPI_WriteRead_Byte(data[0]);//1个字节数据
//      SPI_WriteRead_Byte(data[1]);while(*data != '\0'){SPI_WriteRead_Byte(*data);data ++;}SPI_CS_H;
}void Sector_Erase(void)
{Write_Enable();SPI_CS_L;SPI_WriteRead_Byte(0x20);//20H扇区擦除
SPI_WriteRead_Byte(0x00);//擦除的数据的起始地址SPI_WriteRead_Byte(0x00);SPI_WriteRead_Byte(0x00);SPI_CS_H;
}

MAIN.C

#include "stm32f10x.h"
#include "spi.h"uint8_t val[4] = {0};
uint8_t *p;
//uint8_t send[4] = {0xa8, 0x8a, 0x55, 0xaa};
uint8_t *send = "hello, world";int main(void)
{SPI_GPIO_Init();SPI_CS_L;SPI_WriteRead_Byte(0X90);SPI_WriteRead_Byte(0X90);SPI_WriteRead_Byte(0X90);SPI_WriteRead_Byte(0X00);val[0] = SPI_WriteRead_Byte(0X90);val[1] = SPI_WriteRead_Byte(0X90);SPI_CS_H;    Sector_Erase();while(Read_StatusR1());Page_Program(0x0, 0x0, 0x0, send);while(Read_StatusR1());p = Read_Data(0x0, 0x0, 0x0, 12);while(1);
}

主要学习数组作为参数传递，函数返回数组