AT45db081的spi读写程序.doc

/*功能:实现存储器EEPROM AT45db081的数据读写操作,同时了解硬件spi读写操作作者:ZDP时间:2005-11-30版本:V1.0*/#include #include #include unsigned int Count1msInc;unsigned int AT450XXPageAddr;void SYSCLK_Init (void);void PORT_Init (void);void SPI0_Init (void);void Timer0_Init (void);#define SYSCLK 11059200#define DF_RESET P4&=0x10; P4|=0x10; / AT45DB081复位#define DF_RDY_BUSY P4|=0x20; while(!(P4&0x20); / 等待AT45DB081准备好#define DF_CHIP_SELECT P4&=0x4; / AT45DB081片选开#define DF_CHIP_NOSELECT P4|=0x4; / AT45DB081片选关#define RAM_CHIP_SELECT_BANK0 ES0=1;P4 = 0xF4; #define RAM_CHIP_SELECT_BANK1 P4 = 0xF5; #define BUFFER_1 0x00 / buffer 1#define BUFFER_2 0x01 / buffer 2#define BUFFER_1_WRITE 0x84 / buffer 1 write#define BUFFER_2_WRITE 0x87 / buffer 2 write#define BUFFER_1_READ 0x54 / buffer 1 read (change to 0xD4 for SPI mode 0,3)#define BUFFER_2_READ 0x56 / buffer 2 read (change to 0xD6 for SPI mode 0,3)#define B1_TO_PAGE_WITH_ERASE 0x83 / buffer 1 to main memory page program with built-in erase#define B2_TO_PAGE_WITH_ERASE 0x86 / buffer 2 to main memory page program with built-in erase#define B1_TO_PAGE_WITHOUT_ERASE 0x88 / buffer 1 to main memory page program without built-in erase#define B2_TO_PAGE_WITHOUT_ERASE 0x89 / buffer 2 to main memory page program without built-in erase#define PAGE_PROG_THROUGH_B1 0x82 / main memory page program through buffer 1#define PAGE_PROG_THROUGH_B2 0x85 / main memory page program through buffer 2#define AUTO_PAGE_REWRITE_THROUGH_B1 0x58 / auto page rewrite through buffer 1#define AUTO_PAGE_REWRITE_THROUGH_B2 0x59 / auto page rewrite through buffer 2#define PAGE_TO_B1_COMP 0x60 / main memory page compare to buffer 1#define PAGE_TO_B2_COMP 0x61 / main memory page compare to buffer 2#define PAGE_TO_B1_XFER 0x53 / main memory page to buffer 1 transfer#define PAGE_TO_B2_XFER 0x55 / main memory page to buffer 2 transfer#define STATUS_REGISTER 0x57#define MAIN_MEMORY_PAGE_READ 0x52 / main memory page read (change to 0xD2 for SPI mode 0,3)void SendSPIByte(unsigned char ch) SPIF = 0; SPI0DAT = ch; while (SPIF = 0); / 等待写结束 unsigned char GetSPIByte(void) SPIF = 0; SPI0DAT = 0; while (SPIF = 0); return SPI0DAT; / 等待读结束/启用缓存1读void FlashBuffer1Read(unsigned int star_addr,unsigned int len, unsigned char *buffer) /从缓冲区1的指定位置(0-263)中读入指定字节 unsigned int i; DF_RDY_BUSY;/测芯片准备好？ DF_CHIP_SELECT;/芯片选择 SendSPIByte(BUFFER_1_READ); /缓冲区1为54H SendSPIByte(0); SendSPIByte(unsigned char)(star_addr8); SendSPIByte(unsigned char)star_addr); SendSPIByte(0); for (i=0;i8); SendSPIByte(unsigned char)star_addr); SendSPIByte(0);for (i=0;i8); SendSPIByte(unsigned char)start_addr); for (i=0;i8); SendSPIByte(unsigned char)start_addr); for (i=0;i 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 7); SendSPIByte(unsigned char)(AT450XXPageAddr 8); SendSPIByte(unsigned char)start_addr); for (i=0;i 7); SendSPIByte(unsigned char)(AT450XXPageAddr 8); SendSPIByte(unsigned char)start_addr); for (i=0;i 7); SendSPIByte(unsigned char)(AT450XXPageAddr 8); SendSPIByte(unsigned char)start_addr); for (i=0;i 7); SendSPIByte(unsigned char)(AT450XXPageAddr 8); SendSPIByte(unsigned char)start_addr); for (i=0;ilen;i+) SendSPIByte(buffer); DF_CHIP_NOSELECT;void main (void) unsigned char xdata MyBuff270;unsigned char xdata MyBuff1270;unsigned char xdata *idata MyBuff11;unsigned int i,j;WDTCN = 0xde; / disable watchdog timerWDTCN = 0xad;SYSCLK_Init (); / initialize oscillatorTimer0_Init();PORT_Init (); / initialize crossbar and GPIOEA=1;DF_RESET;SPI0_Init (); / initialize SPI0/ RAM_CHIP_SELECT_BANK0;/ EMI0CF = 0x2F;/*-缓存读写测试-*/for(j=0;j264;j+) /初始化数组数据为：0-264 MyBuffj=j; FlashBuffer1Write(0,264,MyBuff); /写数据至数据缓存区1_nop_();for(j=0;j264;j+) /初始化数组数据全为：0 MyBuffj=0;FlashBuffer1Read(0,264,MyBuff); /读数据缓存区1数据至数组_nop_();/*-FLASH读写测试-*/for(i=0;i8; MyBuff1=i; /将页地址写入数组的前两个字节.for(j=2;j264;j+) MyBuffj=i; /向数组写数据共262个字节 AT450XXPageAddr=i; /指定待写页 FlashBuffer1Write(0,264,MyBuff);/将数组的内容写入缓存1 FlashBuffer1ProgAutoErase(); /将缓存的内容写入主存(带擦除) _nop_();for(i=0;i4096;i+) AT450XXPageAddr=i; /指定待读页 MyBuff11=0x0+i*264; /指定数据放置的XRAM的地址(首地址为0x0). PageToBuffer2(); /将主存内容读入缓存2 FlashBuffer2Read(0,264,MyBuff11); /将缓存2的内容读入XRAM _nop_(); /在此设断点观察XRAM中的数据是否与写入的数据相符._nop_(); /同时在此设一断点在全部读完主存后观察XRAM中的内容./*-其它测试-*/AT450XXPageAddr=0;FlashBuffer1Write(20,14,1234567890UUAA);FlashBuffer1Read(0,260,MyBuff1);FlashBuffer1Write(20,14,3234567890UUAA);FlashBuffer1Read(20,14,MyBuff); /在此处设置断点,观察MyBuff的内容FlashBuffer1ProgNoErase();PageToBuffer2();FlashBuffer2Read(20,14,MyBuff); Count1msInc=0;FlashBuffer2Read(100,14,MyBuff);Count1msInc=0;FlashBuffer1Write(20,14,1234567890UUAA);Count1msInc=0;FlashBuffer1Read(100,14,MyBuff);Count1msInc=0;FlashBuffer1ProgNoErase(); Count1msInc=0;PageToBuffer2();Count1msInc=0;FlashBuffer2Read(100,14,MyBuff);FlashProgViaBuffer1(100,14,MyBuff);/ErasingDataFlash();/EraseFlashPage(); FlashBuffer1Read(1,1, MyBuff); /从缓冲区1的指定位置(0-263)中读入指定字节FlashBuffer2Read(1,1,MyBuff); /从缓冲区2的指定位置(0-263)中读入指定字节FlashBuffer1Write(1,1,!);FlashBuffer2Write(1,1,1);GetFlashStatus();PageToBuffer1();PageToBuffer2();FlashBuffer1ProgNoErase();FlashBuffer2ProgNoErase();FlashBuffer1ProgAutoErase();FlashBuffer2ProgAutoErase();FlashProgViaBuffer1(1,1, MyBuff);FlashProgViaBuffer2(1,1, MyBuff);FlashAutoProgViaBuffer1(1,1, MyBuff);FlashAutoProgViaBuffer2(1,1, MyBuff);while(1);void SYSCLK_Init (void) int i; / delay counter OSCXCN = 0x67; / start external oscillator with / 11.0592MHz crystal for (i=0; i 256; i+) ; / Wait for osc. to start up while (!(OSCXCN & 0x80) ; / Wait for crystal osc. to settle OSCICN = 0x88; / select external