用C8051F120单片机驱动FLASH芯片AT45DB161D.doc

用C8051F120单片机驱动FLASH芯片 AT45DB161D 2011-11-26 08:51 //// AT45DB161D 驱动//// Pinout://// P0.2 - SPI SCK digital output, push-pull // P0.3 - SPI MISO digital input, open-drain // P0.4 - SPI MOSI digital output, push-pull // P0.5- NSSMD0 // P1.6 - LED digital output, push-pull //// all other port pins unused.//// #define SYSCLK 座机电话号码 // Internal oscillator frequency in Hz // #define SPI_CLOCK // Maximum SPI clock// #define FLASH_CHREAD 0x0B#define FLASH_CLREAD 0x03#define FLASH_PREAD 0xD2 //Main Memory Page Read#define FLASH_BUFWRITE1 0x84#define FLASH_BUFWRITE2 0x87#define B1_TO_MM_PAGE_PROG_WITH_ERASE 0x83 // 将第一缓冲区的数据写入主存储器（擦除模式）#define B2_TO_MM_PAGE_PROG_WITH_ERASE 0x86 // 将第二缓冲区的数据写入主存储器（擦除模式） #define FLASH_IDREAD 0x9F#define FLASH_STATUS 0xD7#define PAGE_ERASE 0x81#define PAGE_READ 0xD2#define MM_PAGE_TO_B1_XFER 0x53 // 将主存储器的指定页数据加载到第一缓冲区 #define Dummy_Byte 0xA5/* Select SPI FLASH: ChipSelect pin low */#define Select_Flash NSSMD0 0/* Deselect SPI FLASH: ChipSelect pin high */#define NotSelect_Flash NSSMD0 1U8 xdata Wr_buffer[528];U8 xdata Rr_buffer[528]; U8 Pid[4]; void SPI_Flash_Init void ; //SPI初始化U8 SPI_Flash_ReadByte void ; //flash操作基本函数，读一个字节U8 SPI_Flash_SendByte U8 byte ; // FLASH操作基本函数，发送一个字节void FlashPageEarse U16 page ; //擦除指定的页,页范围0-4095void FlashPageRead U16 page,U16 StartAddr,U16 ReadCount ;写多个字节（页内 void FlashPageWrite U16 page ; //写一整页，页范围0-4095void FlashWaitBusy void ; //Flash忙检测void FlashReadID void ; //读取flashID四个字节U8 xdata ReadAddr[3];U8 xdata state_reg 0x00; U8 SPI_Flash_SendByte U8 byte ; // FLASH操作基本函数，发送一个字节void FlashPageRead U16 page,U16 StartAddr,U16 ReadCount,U16 Soffset ; void FlashWaitBusy void ; //Functionvoid FlashReadID void //读芯片ID  U8 i; U8 SFRPAGE_save SFRPAGE; // Save the current SFRPAGE SFRPAGE SPI0_PAGE; // Switch to the necessary SFRPAGE Select_Flash ; SPI_Flash_SendByte 0x9F ; for i 0; i 4; i++ Pid[i] SPI_Flash_ReadByte ; NotSelect