C8051F Flash 写和读操作

#ifdef __FLASH_ISP__ /* typedef unsigned int FLADDR; void FLASH_ByteWrite (FLADDR addr, char byte); unsigned char FLASH_ByteRead (FLADDR addr); void FLASH_PageErase (FLADDR addr); void FLASH_Write (FLADDR dest, char *src, unsigned numbytes); char * FLASH_Read (char *dest, FLADDR src, unsigned numbytes); */ void FLASH_ByteWrite (FLADDR addr, char byte) { bit EA_SAVE = EA; // preserve EA char xdata * data pwrite; // FLASH write pointer EA = 0; // disable interrupts #ifdef __NULL_VDM0CN__ // change clock speed to slow, then restore later VDM0CN = 0x80; // enable VDD monitor #endif //RSTSRC = 0x02; // enable VDD monitor as a reset source pwrite = (char xdata *) addr; PSCTL |= 0x01; // PSWE = 1 FLKEY = 0xA5; // Key Sequence 1 FLKEY = 0xF1; // Key Sequence 2 #ifdef __NULL_VDM0CN__ VDM0CN = 0x80; // enable VDD monitor #endif //RSTSRC = 0x02; // enable VDD monitor as a reset source *pwrite = byte; // write the byte PSCTL &= ~0x01; // PSWE = 0 EA = EA_SAVE; // restore interrupts } unsigned char FLASH_ByteRead (FLADDR addr) { bit EA_SAVE = EA; // preserve EA char code * data pread; // FLASH read pointer unsigned char byte; EA = 0; // disable interrupts pread = (char code *) addr; byte = *pread; // read the byte EA = EA_SAVE; // restore interrupts return byte; } void FLASH_PageErase (FLADDR addr) { bit EA_SAVE = EA; // preserve EA char xdata * data pwrite; // FLASH write pointer EA = 0; // disable interrupts #ifdef __NULL_VDM0CN__ // change clock speed to slow, then restore later VDM0CN = 0x80; // enable VDD monitor #endif //RSTSRC = 0x02; // enable VDD monitor as a reset source pwrite = (char xdata *) addr; PSCTL |= 0x03; // PSWE = 1; PSEE = 1 FLKEY = 0xA5; // Key Sequence 1 FLKEY = 0xF1; // Key Sequence 2 #ifdef __NULL_VDM0CN__ VDM0CN = 0x80; // enable VDD monitor #endif //RSTSRC = 0x02; // enable VDD monitor as a reset source *pwrite = 0; // initiate page erase PSCTL &= ~0x03; // PSWE = 0; PSEE = 0 EA = EA_SAVE; // restore interrupts } void FLASH_Write (FLADDR dest, char *src, unsigned numbytes) { FLADDR i; for (i = dest; i < dest+numbytes; i++) { FLASH_ByteWrite (i, *src++); } } char * FLASH_Read (char *dest, FLADDR src, unsigned numbytes) { FLADDR i; for (i = 0; i < numbytes; i++) { *dest++ = FLASH_ByteRead (src+i); } return dest; } #endif /* #ifdef __FLASH_ISP__ */

这是在一起C8051F300上的Flash读写操作...

 

和之前的在C8051F310上的读写有点不同

void FLASH_ByteWrite (FLADDR addr, char byte); unsigned char FLASH_ByteRead (FLADDR addr); void FLASH_PageErase (FLADDR addr); void FLASH_Write (FLADDR dest, char *src, unsigned numbytes); char * FLASH_Read (char *dest, FLADDR src, unsigned numbytes); void FLASH_ByteWrite (FLADDR addr, char byte) { bit EA_SAVE = EA; // preserve EA char xdata * data pwrite; // FLASH write pointer EA = 0; // disable interrupts // change clock speed to slow, then restore later VDM0CN = 0x80; // enable VDD monitor RSTSRC = 0x02; // enable VDD monitor as a reset source pwrite = (char xdata *) addr; FLKEY = 0xA5; // Key Sequence 1 FLKEY = 0xF1; // Key Sequence 2 PSCTL |= 0x01; // PSWE = 1 VDM0CN = 0x80; // enable VDD monitor RSTSRC = 0x02; // enable VDD monitor as a reset source *pwrite = byte; // write the byte PSCTL &= ~0x01; // PSWE = 0 EA = EA_SAVE; // restore interrupts } unsigned char FLASH_ByteRead (FLADDR addr) { bit EA_SAVE = EA; // preserve EA char code * data pread; // FLASH read pointer unsigned char byte; EA = 0; // disable interrupts pread = (char code *) addr; byte = *pread; // read the byte EA = EA_SAVE; // restore interrupts return byte; } void FLASH_PageErase (FLADDR addr) { bit EA_SAVE = EA; // preserve EA char xdata * data pwrite; // FLASH write pointer EA = 0; // disable interrupts // change clock speed to slow, then restore later VDM0CN = 0x80; // enable VDD monitor RSTSRC = 0x02; // enable VDD monitor as a reset source pwrite = (char xdata *) addr; FLKEY = 0xA5; // Key Sequence 1 FLKEY = 0xF1; // Key Sequence 2 PSCTL |= 0x03; // PSWE = 1; PSEE = 1 VDM0CN = 0x80; // enable VDD monitor RSTSRC = 0x02; // enable VDD monitor as a reset source *pwrite = 0; // initiate page erase PSCTL &= ~0x03; // PSWE = 0; PSEE = 0 EA = EA_SAVE; // restore interrupts } void FLASH_Write (FLADDR dest, char *src, unsigned numbytes) { FLADDR i; for (i = dest; i < dest+numbytes; i++) { FLASH_ByteWrite (i, *src++); } } char * FLASH_Read (char *dest, FLADDR src, unsigned numbytes) { FLADDR i; for (i = 0; i < numbytes; i++) { *dest++ = FLASH_ByteRead (src+i); } return dest; }

 

不同在于,300上没有VDM0CN 这个寄存器.采用的是注释掉.这样的话在用调试器写入程序的时候读写FLASH没有问题,但拨掉调试器后,第一次读写会使单片机复位.于是查看datasheet,严格要求按照其操作顺序,还是有问题,由于在C8051F310上的FLASH读写过于严谨每次读写之前都启用(RSTSRC = 0x02;                      // enable VDD monitor as a reset source)电压监测复位..于是禁用后不会出现纯正次读写FLASH时复位.但后果未知..有待观察..