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[/] [plasma/] [trunk/] [kernel/] [flash.c] - Rev 378
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/*-------------------------------------------------------------------- * TITLE: Plasma Flash * AUTHOR: Steve Rhoads (rhoadss@yahoo.com) * DATE CREATED: 12/17/05 * FILENAME: plasma.h * PROJECT: Plasma CPU core * COPYRIGHT: Software placed into the public domain by the author. * Software 'as is' without warranty. Author liable for nothing. * DESCRIPTION: * Plasma flash controller * Only the lower 16-bits of each 32-bit word are connected -- * this changes the address mapping to the flash. * ByteOffset and bytes must be a multiple of two. *--------------------------------------------------------------------*/ #include "plasma.h" #include "rtos.h" void FlashRead(uint16 *dst, uint32 byteOffset, int bytes) { volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1)); *ptr = 0xff; //read mode while(bytes > 0) { *dst++ = (uint16)*ptr++; bytes -= 2; } } void FlashWrite(uint16 *src, uint32 byteOffset, int bytes) { volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1)); while(bytes > 0) { *ptr = 0x40; //write mode *ptr++ = *src++; //write data while((*ptr & 0x80) == 0) //check status ; bytes -= 2; } } void FlashErase(uint32 byteOffset) { volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1)); *ptr = 0x20; //erase block *ptr = 0xd0; //confirm while((*ptr & 0x80) == 0) //check status ; }
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