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[/] [plasma/] [trunk/] [kernel/] [flash.c] - Blame information for rev 417

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Line No. Rev Author Line
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/*--------------------------------------------------------------------
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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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static OS_Mutex_t *mutexFlash;
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void FlashLock(void)
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{
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   if(mutexFlash == NULL)
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      mutexFlash = OS_MutexCreate("flash");
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   OS_MutexPend(mutexFlash);
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}
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void FlashUnlock(void)
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{
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   OS_MutexPost(mutexFlash);
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}
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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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   FlashLock();
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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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   FlashUnlock();
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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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   FlashLock();
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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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   FlashUnlock();
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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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   FlashLock();
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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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   FlashUnlock();
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}

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