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