大家好，这是我按照红牛开发板的例程写的一个关于AT45DB161D的程序，但是在进行写操作时，当写的大小超过528BYTE时，就会写不进去，读出来全是0xFF

墨白色雨天 · 发表于 2015-12-14 14:42:37

[mw_shl_code=c,true]主函数的代码：[/mw_shl_code] [mw_shl_code=c,true]#define ADDR_ALL_USERS 0 typedef struct { // uint16_t flag; // uint16_t amount; //已经存储的用户数量 u8 flag; u8 amount; //已经存储的用户数量 uint64_t ID[200]; //最多存储200个用户的卡号 }User_ALL; //单独的一个扇区存储已经保存的用户信 User_ALL RFID_users; typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus; /* Private define ------------------------------------------------------------*/ #define FLASH_WriteAddress 0x000000 #define FLASH_ReadAddress FLASH_WriteAddress #define FLASH_SectorToErase FLASH_WriteAddress #define AT45DB161D_FLASH_ID 0x1F260000 #define BufferSize (countof(Tx_Buffer)-1) #define countof(a) (sizeof(a) / sizeof(*(a))) u8 Tx_Buffer[] = "STM32F10x SPI Firmware Library Example: communication with an AT45DB161D SPI FLASH"; u8 Index, Rx_Buffer[BufferSize]; vu32 flash_ID = 0; volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = PASSED; TestStatus Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength); void Flash_read_allusers(User_ALL *pAllusers) { // uint32_t size = sizeof(User_ALL)/2; u16 size = sizeof(User_ALL); // FSMC_NOR_ReadBuffer((uint16_t *)pAllusers, ADDR_ALL_USERS, size); SPI_FLASH_BufferRead((u8 *)pAllusers, ADDR_ALL_USERS, size); } void Flash_write_allusers(User_ALL *pAllusers) { u16 size = sizeof(User_ALL); SPI_FLASH_PageErase(ADDR_ALL_USERS); SPI_FLASH_BufferWrite((u8 *)pAllusers, ADDR_ALL_USERS, 529); } int main(void) { RCC_Config(); //RCC_HSE_Configuration(); GPIO_Config(); USART_Configuration(); NVIC_Configuration(); SPI_FLASH_Init(); // flash_ID = SPI_FLASH_ReadID(); // SPI_FLASH_BulkErase(); // SPI_FLASH_PageErase(FLASH_SectorToErase); //页擦出 // SPI_FLASH_BufferWrite(Tx_Buffer, FLASH_WriteAddress, BufferSize); //写入数据 // SPI_FLASH_BufferRead(Rx_Buffer, FLASH_ReadAddress, BufferSize); //读出数据 Flash_read_allusers(&RFID_users); printf("RFID_users.flag=%d\r\n",RFID_users.flag); if (RFID_users.flag != 0x5B) { RFID_users.flag = 0x5B; RFID_users.amount = 0; Flash_write_allusers(&RFID_users); Flash_read_allusers(&RFID_users); printf("RFID_users.flag=%d\r\n",RFID_users.flag); } // printf("FLSH_ID=%d\r\n",flash_ID); // printf("%s",Rx_Buffer); // printf("RFID_users.flag=%d\r\n",RFID_users.flag); // printf("FLSH_ID=%d\r\n",RFID_users.amount); while(1) { Flash_read_allusers(&RFID_users); printf("RFID_users.flag=%d\r\n",RFID_users.flag); delay_ms(1000); } }

AT45DB161D的代码：[/mw_shl_code] [mw_shl_code=c,true]#include "pbdata.h" /* Private typedef -----------------------------------------------------------*/ //#define SPI_FLASH_PageSize 512 #define SPI_FLASH_PageSize 512 #define SPI_FLASH_PageNum 4096 /* Private define ------------------------------------------------------------*/ #define WRITE 0x82 /* Write to Memory instruction */ #define READ 0xD3 /* Read from Memory instruction */ #define RDSR 0xD7 /* Read Status Register instruction */ #define RDID 0x9F /* Read identification */ #define PE 0x81 /* Page Erase instruction */ #define BE1 0xC7 /* Bulk Erase instruction */ #define BE2 0x94 /* Bulk Erase instruction */ #define BE3 0x80 /* Bulk Erase instruction */ #define BE4 0x9A /* Bulk Erase instruction */ #define BUSY_Flag 0x80 /* Ready/busy status flag */ #define Dummy_Byte 0xA5 u8 dat; [/mw_shl_code] [mw_shl_code=c,true]void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite) { u16 NumOfPage = 0, NumOfSingle = 0, count = 0, temp = 0; u32 Addr = 0; Addr = WriteAddr % SPI_FLASH_PageSize; NumOfPage = NumByteToWrite / SPI_FLASH_PageSize; NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize; count = SPI_FLASH_PageSize-Addr; if (Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned */ { if (NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */ { SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite); } else /* NumByteToWrite > SPI_FLASH_PageSize */ { while (NumOfPage--) { SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize); WriteAddr += SPI_FLASH_PageSize; pBuffer += SPI_FLASH_PageSize; } SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle); } } else /* WriteAddr is not SPI_FLASH_PageSize aligned */ { if (NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */ { if (NumOfSingle > count) /* (NumByteToWrite + WriteAddr) > SPI_FLASH_PageSize */ { temp = NumOfSingle - count; SPI_FLASH_PageWrite(pBuffer, WriteAddr, count); WriteAddr += count; pBuffer += count; SPI_FLASH_PageWrite(pBuffer, WriteAddr, temp); } else { SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite); } } else /* NumByteToWrite > SPI_FLASH_PageSize */ { NumByteToWrite -= count; NumOfPage = NumByteToWrite / SPI_FLASH_PageSize; NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize; SPI_FLASH_PageWrite(pBuffer, WriteAddr, count); WriteAddr += count; pBuffer += count; while (NumOfPage--) { SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize); WriteAddr += SPI_FLASH_PageSize; pBuffer += SPI_FLASH_PageSize; } if (NumOfSingle != 0) { SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle); } } } }[/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true]void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite) { /* Select the FLASH: Chip Select low */ SPI_FLASH_CS_LOW(); /* Send "Write to Memory " instruction */ SPI_FLASH_SendByte(WRITE); /* Send WriteAddr high nibble address byte to write to */ SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16); /* Send WriteAddr medium nibble address byte to write to */ SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8); /* Send WriteAddr low nibble address byte to write to */ SPI_FLASH_SendByte(WriteAddr & 0xFF); /* while there is data to be written on the FLASH */ while (NumByteToWrite--) { dat = *pBuffer; /* Send the current byte */ SPI_FLASH_SendByte(dat); /* Point on the next byte to be written */ pBuffer++; } /* Deselect the FLASH: Chip Select high */ SPI_FLASH_CS_HIGH(); /* Wait the end of Flash writing */ SPI_FLASH_WaitForWriteEnd(); } 现在的情况是这样，在调用 SPI_FLASH_BufferWrite（）这个函数往FLASH中写数据的时候，如果传递的NumByteToWrite参数大于528，然后在读数据的时候读出来的全是0xFF,各位有没有遇到过这种情况呢？ [/mw_shl_code]