适用于华邦W25X系列，单通道模式；
/****************************************************************************/
/* 深圳恒森微电子有限公司 （华邦单片机香港及中国区代理商） */
/* 香港恒森科技有限公司 （华邦单片机香港及中国区代理商） */
/* 陈文 email：chenwen@hengsen.cn (有 bug 请提交） */
/****************************************************************************/
/* 文件名: spidrv.c */
/* 版本 1.0 */
/* 创建日期: 2007-10-29 10:58 */
/* 概述: 本文件为 w79e823 读写 SPI flash程序 */
/*--------------------------------------------------------------------------*/
/* 历史修改记录： */
/* 名字 日期 注释 */
/* 陈文 2007.10.28 ver 1.0 */
/****************************************************************************/
#include <w79e825.h>
#include <intrins.h>
#define uint8 unsigned char
#define uint16 unsigned int
#define uchar unsigned char
#define uint unsigned int
#define uint32 unsigned long
sbit _cs= P1^2;
sbit _do= P1^3;
sbit _wp= P1^4;
//sbit _hold= P1^5;
sbit _clk= P1^6;
sbit _di= P1^7;
#define W25P_WriteEnable 0x06
#define W25P_WriteDisable 0x04
#define W25P_ReadStatusReg 0x05
#define W25P_WriteStatusReg 0x01
#define W25P_ReadData 0x03
#define W25P_FastReadData 0x0B
#define W25P_PageProgram 0x02
#define W25P_SectorErase 0xD8 // 64KB
#define W25P_ChipErase 0xC7
#define W25P_PowerDown 0xB9
#define W25P_ReleasePowerDown 0xAB
#define W25P_DeviceID 0xAB
#define W25P_ManufactDeviceID 0x90
void init_cpu(void);
void IO_Send_Byte(uchar out);
uchar IO_Get_Byte();
void delay(uchar tt);
void IO_Wait_Busy();
void IO_init();
uchar IO_Read_StatusReg();
void IO_Write_StatusReg(byte);
void IO_Write_Enable();
void IO_PowerDown();
void IO_ReleasePowerDown();
uchar IO_Read_ID1();
uint IO_Read_ID2(uchar ID_Addr);
uchar IO_Read_Byte(uint32 Dst_Addr);
void IO_Read_nBytes(uint32 Dst_Addr, uchar nBytes_128);
uchar IO_FastRead_Byte(uint32 Dst_Addr);
void IO_FastRead_nBytes(uint32 Dst_Addr, uchar nBytes_128);
void IO_Write_Byte(uint32 Dst_Addr, uchar byte);
void IO_Write_nBytes(uint32 Dst_Addr, uchar nBytes_128);
void IO_Erase_Chip();
void IO_Erase_Sector(uint32 Dst_Addr);
void Verify(uchar byte, uchar cor_byte);
void IO_Write_Disable();
void trace(uchar *str,uchar len);
uint IO_Read_ID3();
uint8 Rxtemp;
bit MYTI;
uint8 tx_buff[16];
uint8 upper_128[16];
bit rx_ok;
#define nop() _nop_()
void main(void)
{
uint i;
init_cpu();
IO_init();
for(;;)
{
if(rx_ok == 1)
{
rx_ok = 0;
switch(Rxtemp)
{
case 0x01:
Rxtemp = 0;
tx_buff[0] = IO_Read_ID1();
trace(tx_buff,1);
break;
case 0x02:
i = IO_Read_ID2(0x00);
tx_buff[1] = (uchar)i;
tx_buff[0] = (uchar)(i>>8);
trace(tx_buff,2);
break;
case 0x03:
i = IO_Read_ID3();
tx_buff[1] = (uchar)i;
tx_buff[0] = (uchar)(i>>8);
trace(tx_buff,3);
break;
case 0x04:
tx_buff[0] = IO_Read_Byte(0x00000000);
trace(tx_buff,1);
break;
case 0x05:
tx_buff[0] = 0x55;
IO_Write_Byte(0x00000000,0xa5);
trace(tx_buff,1);
break;
case 0x06:
tx_buff[0] = IO_Read_StatusReg();
trace(tx_buff,1);
break;
case 0x07:
IO_Write_Enable();
break;
case 0x08:
upper_128[0]=0x01;upper_128[1]=0x02;upper_128[2]=0x03;upper_128[3]=0x04;
IO_Write_nBytes(0x00000000,4);
break;
case 0x09:
IO_Erase_Chip();
break;
case 0x0a:
IO_Erase_Sector(0x00000000);
break;
default:
break;
}
}
}
}
void init_cpu(void)
{
TMOD = 0x21;
PCON = PCON | 0x80; //波特率加倍
//CKCON = 0x10; //定时器1采用4分频
SCON = 0x50; //异步、10位、波特率可变，无校验位
TH1 = 0xf8; //在15M晶振下，波特率是9600，
TL1 = 0xf8;
TR1 = 1; //T1 timer run
ES = 1; //uart interrupt enable
EA = 1; //all interrupt enable
}
//串口中断程序
void UART_isr(void) interrupt 4
{
if(RI)
{
RI = 0;
Rxtemp = SBUF; //接收
//SBUF = Rxtemp; //发送
rx_ok = 1;
return;
}
if(TI)
{
TI = 0;
MYTI = 1;
}
}
void IO_Send_Byte(uchar out)
{
uchar i = 0;
_cs = 0;
for (i = 0; i < 8; i++)
{
if ((out & 0x80) == 0x80) /* check if MSB is high */
_di = 1;
else
_di = 0; /* if not, set to low */
_clk = 1; /* toggle clock high */
out = (out << 1); /* shift 1 place for next bit */
nop();nop();nop();nop();
_clk = 0; /* toggle clock low */
}
}
uchar IO_Get_Byte()
{
uchar i = 0, in = 0, temp = 0;
_cs = 0;
for (i = 0; i < 8; i++)
{
in = (in << 1); /* shift 1 place to the left or shift in 0 */
temp = _do; /* save input */
_clk = 1; /* toggle clock high */
if (temp == 1) /* check to see if bit is high */
in |= 0x01; /* if high, make bit high */
_clk = 0; /* toggle clock low */
}
return in;
}
void delay(uchar tt)
{
while(tt--);
}
void IO_Wait_Busy()
{
/* waste time until not busy WEL & Busy bit all be 1 (0x03). */
while (IO_Read_StatusReg() == 0x03)
IO_Read_StatusReg();
}
void IO_init()
{
_clk = 0; /* set clock to low initial state for SPI operation mode 0 */
// _clk = 1; /* set clock to low initial state for SPI operation mode 3 */
// _hold = 1;
_wp = 1;
_cs = 1;
IO_Write_Disable();
}
uchar IO_Read_StatusReg()
{
uchar byte = 0;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_ReadStatusReg); /* send Read Status Register command */
byte = IO_Get_Byte(); /* receive byte */
_cs = 1; /* disable device */
return byte;
}
void IO_Write_StatusReg(byte)
{
_cs = 0; /* enable device */
IO_Send_Byte(W25P_WriteStatusReg); /* select write to status register */
IO_Send_Byte(byte); /* data that will change the status(only bits 2,3,7 can be written) */
_cs = 1; /* disable the device */
}
void IO_Write_Enable()
{
_cs = 0; /* enable device */
IO_Send_Byte(W25P_WriteEnable); /* send W25P_Write_Enable command */
_cs = 1; /* disable device */
}
void IO_PowerDown()
{
_cs = 0;; /* enable device */
IO_Send_Byte(W25P_PowerDown); /* send W25P_PowerDown command 0xB9 */
_cs = 1;; /* disable device */
delay(6); /* remain CS high for tPD = 3uS */
}
void IO_ReleasePowerDown()
{
_cs = 0; /* enable device */
IO_Send_Byte(W25P_ReleasePowerDown); /* send W25P_PowerDown command 0xAB */
_cs = 1; /* disable device */
delay(6); /* remain CS high for tRES1 = 3uS */
}
uchar IO_Read_ID1()
{
uchar byte;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_DeviceID); /* send read device ID command (ABh) */
IO_Send_Byte(0); /* send address */
IO_Send_Byte(0); /* send address */
IO_Send_Byte(0); /* send 3_Dummy address */
byte = IO_Get_Byte(); /* receive Device ID byte */
_cs = 1; /* disable device */
delay(4); /* remain CS high for tRES2 = 1.8uS */
return byte;
}
uint IO_Read_ID2(uchar ID_Addr)
{
uint IData16;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_ManufactDeviceID); /* send read ID command (90h) */
IO_Send_Byte(0x00); /* send address */
IO_Send_Byte(0x00); /* send address */
IO_Send_Byte(ID_Addr); /* send W25Pxx selectable ID address 00H or 01H */
IData16 = IO_Get_Byte()<<8; /* receive Manufature or Device ID byte */
IData16 |= IO_Get_Byte(); /* receive Device or Manufacture ID byte */
_cs = 1; /* disable device */
return IData16;
}
uint IO_Read_ID3()
{
uint IData16;
_cs = 0; /* enable device */
IO_Send_Byte(0x9f); /* send read ID command (90h) */
IData16 = IO_Get_Byte()<<8; /* receive Manufature or Device ID byte */
IData16 |= IO_Get_Byte(); /* receive Device or Manufacture ID byte */
tx_buff[2] = IO_Get_Byte();
_cs = 1; /* disable device */
return IData16;
}
uchar IO_Read_Byte(uint32 Dst_Addr)
{
uchar byte = 0;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_ReadData); /* read command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
byte = IO_Get_Byte();
_cs = 1; /* disable device */
return byte; /* return one byte read */
}
void IO_Read_nBytes(uint32 Dst_Addr, uchar nBytes_128)
{
uint32 i = 0;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_ReadData); /* read command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
for (i = 0; i < nBytes_128; i++) /* read until no_bytes is reached */
{
upper_128[i] = IO_Get_Byte(); /* receive byte and store at address 80H - FFH */
}
_cs = 1; /* disable device */
}
uchar IO_FastRead_Byte(uint32 Dst_Addr)
{
uchar byte = 0;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_FastReadData); /* fast read command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
IO_Send_Byte(0xFF); /*dummy byte*/
byte = IO_Get_Byte();
_cs = 1; /* disable device */
return byte; /* return one byte read */
}
void IO_FastRead_nBytes(uint32 Dst_Addr, uchar nBytes_128)
{
uchar i = 0;
_cs = 0; /* enable device */
IO_Send_Byte(W25P_FastReadData); /* read command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
IO_Send_Byte(0xFF); /*dummy byte*/
for (i = 0; i < nBytes_128; i++) /* read until no_bytes is reached */
{
upper_128[i] = IO_Get_Byte(); /* receive byte and store at address 80H - FFH */
}
_cs = 1; /* disable device */
}
void IO_Write_Byte(uint32 Dst_Addr, uchar byte)
{
_cs = 0; /* enable device */
IO_Write_Enable(); /* set WEL */
IO_Wait_Busy();
_cs = 0;
IO_Send_Byte(W25P_PageProgram); /* send Byte Program command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
IO_Send_Byte(byte); /* send byte to be programmed */
_cs = 1; /* disable device */
}
void IO_Write_nBytes(uint32 Dst_Addr, uchar nBytes_128)
{
uchar i, byte;
_cs = 0; /* enable device */
IO_Write_Enable(); /* set WEL */
_cs = 0;
IO_Send_Byte(W25P_PageProgram); /* send Byte Program command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
for (i = 0; i < nBytes_128; i++)
{
byte = upper_128[i];
IO_Send_Byte(byte); /* send byte to be programmed */
}
_cs = 1; /* disable device */
//printf("\nPage program (%d nBytes)! please waiting....\n");
}
void IO_Erase_Chip()
{
_cs = 0; /* enable device */
IO_Write_Enable(); /* set WEL */
_cs = 0;
IO_Wait_Busy();
_cs = 0;
IO_Send_Byte(W25P_ChipErase); /* send Chip Erase command */
_cs = 1; /* disable device */
}
void IO_Erase_Sector(uint32 Dst_Addr)
{
_cs = 0; /* enable device */
IO_Write_Enable(); /* set WEL */
_cs = 0;
IO_Send_Byte(W25P_SectorErase); /* send Sector Erase command */
IO_Send_Byte(((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */
IO_Send_Byte(((Dst_Addr & 0xFFFF) >> 8));
IO_Send_Byte(Dst_Addr & 0xFF);
_cs = 1; /* disable device */
}
void Verify(uchar byte, uchar cor_byte)
{
if (byte != cor_byte)
{
while(1);
//LED_Error = 0; /* display to view error on LED. */
}
}
void IO_Write_Disable()
{
_cs = 0; /* enable device */
IO_Send_Byte(W25P_WriteDisable); /* send W25P_Write_Disable command */
_cs = 1; /* disable device */
}
void myputchar(uchar c)
{
ES = 0;
SBUF = c;
while (TI == 0);
TI = 0;
ES = 1;
}
void trace(uchar *str,uchar len)
{
uint i;
for(i=0;i<len;i++)
{
myputchar(*str);
str++;
}
}
//IO_Read_StatusReg Reads the status register of the serial flash
//IO_Write_StatusReg Performs a write to the status register
//IO_Write_Enable Write enables the serial flash
//IO_Write_Disable Write disables the serial flash
//IO_Read_ID1 Reads the device ID using the instruction 0xAB
//IO_Read_ID2 Reads the manufacturer ID and device ID with 0x90
//IO_Read_Byte Reads one byte from the serial flash and returns byte(max of 20 MHz CLK frequency)
//IO_Read_nBytes Reads multiple bytes(max of 20 MHz CLK frequency)
//IO_FastRead_Byte Reads one byte from the serial flash and returns byte(max of 33 MHz CLK frequency)
//IO_FastRead_nBytes Reads multiple bytes(max of 33 MHz CLK frequency)
//IO_Write_Byte Program one byte to the serial flash
//IO_Write_nBytes Program n bytes to the serial flash, n<=256
//IO_Erase_Chip Erases entire serial flash
//IO_Erase_Sector Erases one sector (64 KB) of the serial flash
//IO_Wait_Busy Polls status register until busy bit is low
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