?? sst25vf020.c
字號(hào):
// sst25vf020_transaction( tBuffer, rBuffer, 1); // // Send the write command to status register // tBuffer[0] = SST25VF020_WRITE_STATUS_REGISTER; tBuffer[1] = 0; // // Finish the phase of writing status register // sst25vf020_transaction( tBuffer, rBuffer, 2); // // Send the write_enable command to status register // tBuffer[0] = SST25VF020_WRITE_ENABLE; // // Finish the phase of writing enable command // sst25vf020_transaction( tBuffer, rBuffer, 1); // // Send the sector_erase command and the address to eeprom // tBuffer[0] = SST25VF020_SECTOR_ERASE; tBuffer[1] = addr >> 16; tBuffer[2] = addr >> 8; tBuffer[3] = addr; // // Finish the phase of writing sector_erase command // sst25vf020_transaction( tBuffer, rBuffer, 4); // // Get the ready status of status register // while( !sst25vf020_get_ready() ) { delay_usec(1); } } return 1;}//-----------------------------------------------------------------------------// program_sst25vf020 chip write//-----------------------------------------------------------------------------int program_sst25vf020(unsigned int addr, unsigned char *pBuffer, int length){ int wlen; int i; unsigned char tBuffer[8]; unsigned char rBuffer[8]; volatile unsigned char * pData; unsigned long pulTest; addr &= 0x3ffff; pData = pBuffer; wlen = length; i=0; while(length > 0) { // // Send the write_enable command to status register // tBuffer[0] = SST25VF020_WRITE_ENABLE; // // Finish the phase of writing enable command // sst25vf020_transaction( tBuffer, rBuffer, 1); // // Send byte_program command and the address to eeprom // tBuffer[0] = SST25VF020_BYTE_PROGRAM; tBuffer[1] = (addr >> 16) & 0xFF; tBuffer[2] = (addr >> 8) & 0xFF; tBuffer[3] = addr & 0x0FF; // // Write the byte to eeprom // tBuffer[4] = pData[i++]; // // Finish the phase of writing the datas to eeprom // sst25vf020_transaction( tBuffer, rBuffer, 5); delay_usec(5); // // Get the ready status of status register // while( !sst25vf020_get_ready() ) { delay_usec(1); } delay_usec(5); // //Read-back verification // pulTest = read_sst25vf020(addr,(unsigned char *)(0),4); if((pulTest&0xff)!= pData[i-1]) { return -1; } // // Decrease the length of the buffer that will be sent // and increase the address of the eeprom // length -= 1; addr += 1; } return wlen; }unsigned long read_sst25vf020(unsigned int start, unsigned char *pBuffer, int numBytes){ unsigned long ulRet, ulTemp; //unsigned long count=0; unsigned long ulOffset = start; out(SSP1DR,0x03); out(SSP1DR, (ulOffset >>16) & 255); out(SSP1DR, (ulOffset >>8) & 255); out(SSP1DR, ulOffset & 255); do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); out(SSP1DR,0x00); out(SSP1DR,0x00); out(SSP1DR,0x00); out(SSP1DR,0x00); do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); do{ ulTemp =in(SSP1SR); }while (!(ulTemp & 0x04)); ulTemp = in(SSP1DR); do{ ulTemp =in(SSP1SR); } while(!(ulTemp & 0x04)); ulRet = in(SSP1DR); do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); ulRet |= ulTemp<<8; do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); ulRet |= ulTemp<<16; do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x04)); ulTemp = in(SSP1DR); ulRet |= ulTemp <<24; do{ ulTemp = in(SSP1SR); } while(!(ulTemp & 0x01)); do{ ulTemp = in(SSP1SR); if(ulTemp & 0x04) ulTemp = in(SSP1DR); } while (ulTemp & 0x04); return ulRet; /* do { out(SSP1DR,0x03); out(SSP1DR, (start >>16) & 255); out(SSP1DR, (start >>8) & 255); out(SSP1DR, (start & 255)); ulTemp = in(SSP1DR); out(SSP1DR,0x00); out(SSP1DR,0x00); out(SSP1DR,0x00); out(SSP1DR,0x00); while(!(in(SSP1SR) & 0x04)); ulTemp = in(SSP1DR); while(!(in(SSP1SR) & 0x04)); ulTemp = in(SSP1DR); while(!(in(SSP1SR) & 0x04)); ulTemp = in(SSP1DR); for(i=0; (i < 4) & (count < numBytes); i++) { while(!(in(SSP1SR) & 0x04)); pBuffer[count]=(unsigned char)in(SSP1DR); count++; } // while(!(in(SSP1SR) & 0x04)); // ulRet = in(SSP1DR); // while(!(in(SSP1SR) & 0x04)); // ulRet |=in(SSP1DR) << 8; // while(!(in(SSP1SR) & 0x04)); // ulRet |=in(SSP1DR) <<16; // while(!(in(SSP1SR) & 0x04)); // ulRet |=in(SSP1DR) <<24; while(!in(SSP1SR) & 0x01); do { ulTemp = in(SSP1SR); if (ulTemp & 0x04) ulTemp = in(SSP1DR); } while (ulTemp & 0x04); } while (count < numBytes); return numBytes; */ /* int i=0, temp; int delay; while(SSP1->SSPSR.Field.TFE == 0); while(SSP1->SSPSR.Field.RNE == 1) { temp = SSP1->SSPDR.Value; } start &= 0x1ffff; do { SSP1->SSPDR.Value = CMD_READ_DATA; //| ((start & 0x100) >> 5); // SSP1->SSPDR.Value = 0; SSP1->SSPDR.Value = start>>16; SSP1->SSPDR.Value = start>>8; SSP1->SSPDR.Value = start; temp = SSP1->SSPDR.Value; SSP1->SSPDR.Value = 0x00; SSP1->SSPDR.Value = 0x00; SSP1->SSPDR.Value = 0x00; SSP1->SSPDR.Value = 0x00; temp = SSP1->SSPDR.Value; temp = SSP1->SSPDR.Value; temp = SSP1->SSPDR.Value; while(SSP1->SSPSR.Field.TFE == 0); // while(SSP1->SSPSR.Field.RNE == 1) // Throw away unwanted values // while(!SSP1->SSPSR.Field.RNE); // { // Keep only the last one // pBuffer[i] =(unsigned char)SSP1->SSPDR.Value; // for(delay=10;delay >0; delay--); // } for(i=0; (i < 4) & (count < numBytes); i++) { while(!(in(SSP1SR) & 0x04)); pBuffer[count]=(unsigned char)SSP1->SSPDR.Value; count++; } start +=4; // for(delay=64;delay >0; delay--); } while(count < numBytes); // for(delay=64;delay >0; delay--); return(numBytes); */ }?? 快捷鍵說明
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