spi_flash.c

8051访问spi flash的读写代码

#include "spi_flash.h"

#define spi_flash_init reg_spi_ctrl=0x03;//no cs, IF enable
#define spi_flash_start reg_spi_ctrl=0x01;//cs, IF enable
#define spi_flash_end reg_spi_ctrl=0x03;//no cs, IF enable
//*/

void spi_flash_writeonebyte(unsigned char ucdata)
{
	unsigned char rt;
	reg_spi_data=ucdata;
	do
	{
		rt=reg_spi_ctrl;
	}
	while((rt&0x80)==0);
}

unsigned char spi_flash_readonebyte()
{
	unsigned char rt;
	reg_spi_data=0xff;
	do
	{
		rt=reg_spi_ctrl;
	}
	while((rt&0x80)==0);
	rt=reg_spi_data;
	return rt;
}

#define SPI_FLASH_INSTRUCTIONS_WREN 0x06
#define SPI_FLASH_INSTRUCTIONS_WRDI 0x04
#define SPI_FLASH_INSTRUCTIONS_RDID 0x9F
#define SPI_FLASH_INSTRUCTIONS_RDSR 0x05
#define SPI_FLASH_INSTRUCTIONS_WRSR 0x01
#define SPI_FLASH_INSTRUCTIONS_READ 0x03
#define SPI_FLASH_INSTRUCTIONS_FAST_READ 0x0B
#define SPI_FLASH_INSTRUCTIONS_PP 0x02
#define SPI_FLASH_INSTRUCTIONS_SE 0xD8
#define SPI_FLASH_INSTRUCTIONS_BE 0xC7
#define SPI_FLASH_INSTRUCTIONS_DP 0xB9
#define SPI_FLASH_INSTRUCTIONS_RES 0xAB
void spi_flash_single_instruction(unsigned char instruction)
{
	spi_flash_start
	spi_flash_writeonebyte(instruction);
	spi_flash_end
}

unsigned char spi_flash_rdsr()
{
	unsigned char uctmp;
	spi_flash_start
	spi_flash_writeonebyte(SPI_FLASH_INSTRUCTIONS_RDSR);
	uctmp=spi_flash_readonebyte();
	spi_flash_end
	return uctmp;
}

void spi_flash_readid(unsigned char* target_arr)
{
	unsigned char uctmp;
	spi_flash_start
	spi_flash_writeonebyte(SPI_FLASH_INSTRUCTIONS_RDID);
	uctmp=spi_flash_readonebyte();
	*target_arr=uctmp;
	target_arr++;
	uctmp=spi_flash_readonebyte();
	*target_arr=uctmp;
	target_arr++;
	uctmp=spi_flash_readonebyte();
	*target_arr=uctmp;
	target_arr++;
	spi_flash_end
}

void spi_flash_read(unsigned char addr[4], unsigned char* target_arr, unsigned int count)
{
	unsigned char uctmp;
WAIT_NO_WIP:
	uctmp=spi_flash_rdsr();
	if((uctmp&0x01)==0x01)
	{
		goto WAIT_NO_WIP;
	}
	spi_flash_start
	spi_flash_writeonebyte(SPI_FLASH_INSTRUCTIONS_READ);
	spi_flash_writeonebyte(addr[1]);
	spi_flash_writeonebyte(addr[2]);
	spi_flash_writeonebyte(addr[3]);
	while(count>0)
	{
		uctmp=spi_flash_readonebyte();
		*target_arr=uctmp;
		target_arr++;
		count--;
	}
	spi_flash_end
}

void spi_flash_page_program(unsigned char addr[4], unsigned char* target_arr, unsigned int count)
{
	unsigned char uctmp;
	unsigned char uctmp1;
WAIT_NO_WIP:
	uctmp=spi_flash_rdsr();
	if((uctmp&0x01)==0x01)
	{
		goto WAIT_NO_WIP;
	}
	spi_flash_single_instruction(SPI_FLASH_INSTRUCTIONS_WREN);//enable write
	spi_flash_start
	spi_flash_writeonebyte(SPI_FLASH_INSTRUCTIONS_PP);
	spi_flash_writeonebyte(addr[1]);
	spi_flash_writeonebyte(addr[2]);
	spi_flash_writeonebyte(addr[3]);
	uctmp1=255;
	while(count>0)
	{
		uctmp=*target_arr;
		spi_flash_writeonebyte(uctmp);
		target_arr++;
		count--;
		uctmp1--;
	}
	while(uctmp1>0)
	{
		uctmp=0;
		spi_flash_writeonebyte(uctmp);
		uctmp1--;
	}
	spi_flash_end
}

void spi_flash_sector_erase(unsigned char addr[4])
{
	unsigned char uctmp;
WAIT_NO_WIP:
	uctmp=spi_flash_rdsr();
	if((uctmp&0x01)==0x01)
	{
		goto WAIT_NO_WIP;
	}
	spi_flash_single_instruction(SPI_FLASH_INSTRUCTIONS_WREN);//enable write
	spi_flash_start
	spi_flash_writeonebyte(SPI_FLASH_INSTRUCTIONS_SE);
	spi_flash_writeonebyte(addr[1]);
	spi_flash_writeonebyte(addr[2]);
	spi_flash_writeonebyte(addr[3]);
	spi_flash_end
}

void spi_flash_bulk_erase()
{
	unsigned char uctmp;
WAIT_NO_WIP:
	uctmp=spi_flash_rdsr();
	if((uctmp&0x01)==0x01)
	{
		goto WAIT_NO_WIP;
	}
	spi_flash_single_instruction(SPI_FLASH_INSTRUCTIONS_WREN);//enable write
	spi_flash_single_instruction(SPI_FLASH_INSTRUCTIONS_BE);//enable write
}