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https://github.com/mist-devel/mist-board.git
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148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
#include "diskio.h"
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#include "mmc.h"
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#include "spi.h"
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//#include "printf.h"
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void mmcReadCached(u32 sector);
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u32 n_actual_mmc_sector;
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extern unsigned char mmc_sector_buffer[512];
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void mmcReadCached(u32 sector)
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{
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//debug("mmcReadCached");
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//plotnext(toatarichar(' '));
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//plotnextnumber(sector);
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//debug("\n");
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if(sector==n_actual_mmc_sector) return;
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//debug("mmcReadREAL");
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//plotnext(toatarichar(' '));
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//plotnextnumber(sector);
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//debug("\n");
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u08 ret,retry;
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//predtim nez nacte jiny, musi ulozit soucasny
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// TODO mmcWriteCachedFlush();
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//az ted nacte novy
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retry=0; //zkusi to maximalne 256x
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do
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{
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ret = mmcRead(sector); //vraci 0 kdyz ok
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retry--;
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} while (ret && retry);
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while(ret); //a pokud se vubec nepovedlo, tady zustane zablokovany cely SDrive!
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n_actual_mmc_sector=sector;
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}
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/*-----------------------------------------------------------------------*/
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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (void)
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{
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DSTATUS stat;
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//printf(" in init ");
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n_actual_mmc_sector = 0xffffffff;
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for(;;)
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{
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mmc_init();
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if (0==mmcRead(1))
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break;
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}
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//printf(" setting freq ");
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set_spi_clock_freq();
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stat = RES_OK;
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return stat;
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}
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/*-----------------------------------------------------------------------*/
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/* Read Partial Sector */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_readp (
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BYTE* dest, /* Pointer to the destination object */
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DWORD sector, /* Sector number (LBA) */
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WORD sofs, /* Offset in the sector */
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WORD count /* Byte count (bit15:destination) */
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)
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{
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DRESULT res;
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/*debug("readp:");
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plotnextnumber(sector);
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debug(" ");
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plotnextnumber((int)dest);
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debug(" ");
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plotnextnumber(sofs);
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debug(" ");
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plotnextnumber(count);
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debug(" ");
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plotnextnumber(atari_sector_buffer);
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debug(" ");
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plotnextnumber(mmc_sector_buffer);
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debug("\n");
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*/
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// Put your code here
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mmcReadCached(sector);
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for(;count>0;++sofs,--count)
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{
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unsigned char x = mmc_sector_buffer[sofs];
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//printf("char:%c loc:%d ", x,sofs);
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*dest++ = x;
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}
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res = RES_OK;
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return res;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Partial Sector */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_writep (const BYTE* buff, DWORD sofs, DWORD count)
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{
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DRESULT res;
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int i=sofs;
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int end=sofs+count;
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int pos = 0;
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for (;i!=end;++i,++pos)
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{
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mmc_sector_buffer[i] = buff[pos];
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//printf("char:%c loc:%d,", buff[pos],i);
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}
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res = RES_OK;
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return res;
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}
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void disk_writeflush()
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{
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// Finalize write process
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int retry=16; //zkusi to maximalne 16x
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int ret;
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//printf(":WSECT:%d",n_actual_mmc_sector);
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do
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{
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ret = mmcWrite(n_actual_mmc_sector); //vraci 0 kdyz ok
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retry--;
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} while (ret && retry);
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//printf(":WD:");
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}
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