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unified dataflash access for USB and filesystem

This commit is contained in:
bsx 2011-06-17 13:12:02 +02:00
parent 0020ee5dc1
commit 84433bb1d6
2 changed files with 11 additions and 116 deletions
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111
filesystem/at45db041d.c
View File

@ -77,18 +77,16 @@ DRESULT dataflash_random_read(BYTE *buff, DWORD offset, DWORD length) {
if (status & STA_NOINIT) return RES_NOTRDY;
if (offset+length > MAX_PAGE*256) return RES_PARERR;
DWORD pages = length/256 + 1;
do {
wait_for_ready();
DWORD pageaddr = ((offset/256) << 9) | (offset%256);
DWORD remaining = 256 - offset%256;
if (remaining > length) {
remaining = length;
} else if (remaining > length) {
length -= remaining;
offset += remaining;
}
length -= remaining;
offset += remaining;
CS_LOW();
xmit_spi(OP_PAGEREAD);
xmit_spi((BYTE)(pageaddr >> 16));
@ -102,41 +100,13 @@ DRESULT dataflash_random_read(BYTE *buff, DWORD offset, DWORD length) {
rcvr_spi_m(buff++);
} while (--remaining);
CS_HIGH();
} while (--pages);
} while (length);
return length ? RES_ERROR : RES_OK;
}
DRESULT dataflash_read(BYTE *buff, DWORD sector, BYTE count) {
if (!count) return RES_PARERR;
if (status & STA_NOINIT) return RES_NOTRDY;
/* convert sector numbers to page numbers */
sector *= 2;
count *= 2;
if (sector+count > MAX_PAGE) return RES_PARERR;
do {
wait_for_ready();
DWORD pageaddr = sector << 9; // lower 9 bits are byte address within the page
DWORD remaining = 256;
CS_LOW();
xmit_spi(OP_PAGEREAD);
xmit_spi((BYTE)(pageaddr >> 16));
xmit_spi((BYTE)(pageaddr >> 8));
xmit_spi((BYTE)pageaddr);
xmit_spi(0x00); // follow up with 4 don't care bytes
xmit_spi(0x00);
xmit_spi(0x00);
xmit_spi(0x00);
do {
rcvr_spi_m(buff++);
} while (--remaining);
sector++;
CS_HIGH();
} while (--count);
return count ? RES_ERROR : RES_OK;
return dataflash_random_read(buff, sector*512, count*512);
}
#if _READONLY == 0
@ -145,18 +115,15 @@ DRESULT dataflash_random_write(const BYTE *buff, DWORD offset, DWORD length) {
if (status & STA_NOINIT) return RES_NOTRDY;
if (offset+length > MAX_PAGE*256) return RES_PARERR;
DWORD pages = length/256 + 1;
do {
wait_for_ready();
DWORD pageaddr = ((offset/256) << 9) | (offset%256);
DWORD remaining = 256 - offset%256;
if (remaining > length) {
remaining = length;
} else if (remaining > length) {
length -= remaining;
offset += remaining;
}
length -= remaining;
offset += remaining;
// read page into the internal buffer
CS_LOW();
@ -202,73 +169,13 @@ DRESULT dataflash_random_write(const BYTE *buff, DWORD offset, DWORD length) {
xmit_spi((BYTE)pageaddr);
CS_HIGH();
}
} while (--pages);
} while (length);
return length ? RES_ERROR : RES_OK;
}
DRESULT dataflash_write(const BYTE *buff, DWORD sector, BYTE count) {
if (!count) return RES_PARERR;
if (status & STA_NOINIT) return RES_NOTRDY;
/* convert sector numbers to page numbers */
sector *= 2;
count *= 2;
if (sector+count > MAX_PAGE) return RES_PARERR;
do {
wait_for_ready();
DWORD pageaddr = sector << 9; // lower 9 bits are byte address within the page
DWORD remaining = 256;
// read page into the internal buffer
CS_LOW();
xmit_spi(OP_PAGE2BUFFER1);
xmit_spi((BYTE)(pageaddr >> 16));
xmit_spi((BYTE)(pageaddr >> 8));
xmit_spi((BYTE)pageaddr);
CS_HIGH();
wait_for_ready();
// write bytes into the dataflash buffer
CS_LOW();
xmit_spi(OP_BUFFER1WRITE);
xmit_spi(0x00);
xmit_spi(0x00);
xmit_spi(0x00);
do {
xmit_spi(*buff++);
} while (--remaining);
sector++;
CS_HIGH();
wait_for_ready();
// compare buffer with target memory page
CS_LOW();
xmit_spi(OP_BUFFER1PAGECMP);
xmit_spi((BYTE)(pageaddr >> 16));
xmit_spi((BYTE)(pageaddr >> 8));
xmit_spi((BYTE)pageaddr);
CS_HIGH();
wait_for_ready();
CS_LOW();
BYTE reg_status = 0xFF;
xmit_spi(OP_STATUSREAD);
rcvr_spi_m((uint8_t *) &reg_status);
CS_HIGH();
// trigger program only if data changed
if (reg_status & SB_COMP) {
CS_LOW();
xmit_spi(OP_BUFFER1PROG);
xmit_spi((BYTE)(pageaddr >> 16));
xmit_spi((BYTE)(pageaddr >> 8));
xmit_spi((BYTE)pageaddr);
CS_HIGH();
}
} while (--count);
return count ? RES_ERROR : RES_OK;
return dataflash_random_write(buff, sector*512, count*512);
}
#endif /* _READONLY */

16
usb/usbmsc.c
View File

@ -14,23 +14,11 @@ MSC_DEVICE_INFO MscDevInfo;
ROM ** rom = (ROM **)0x1fff1ff8;
void usbMSCWrite(uint32_t offset, uint8_t src[], uint32_t length) {
uint8_t x;
x = DoString(0,0,"WOffset:");
DoInt(x,0,offset);
x = DoString(0,10,"WLength:");
DoInt(x,10,length);
lcdDisplay(0);
dataflash_random_write(src, offset, length);
dataflash_random_write(src, offset+1, length);
}
void usbMSCRead(uint32_t offset, uint8_t dst[], uint32_t length) {
uint8_t x;
x = DoString(0,20,"ROffset:");
DoInt(x,20,offset);
x = DoString(0,30,"RLength:");
DoInt(x,30,length);
lcdDisplay(0);
dataflash_random_read(dst, offset, length);
dataflash_random_read(dst, offset+1, length);
}
void usbMSCInit(void) {