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Code Issues Wiki Activity

Fixes #3836: if multi-block SD read fails, fall back to the single block reads [Horus]

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This commit is contained in:
Damjan Adamic 2016-09-20 21:12:43 +02:00
parent 444d552d5a
commit f03837f45d
1 changed files with 49 additions and 45 deletions
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94
radio/src/targets/horus/diskio.cpp
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@ -118,58 +118,24 @@ uint32_t sdReadRetries = 0;
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
DRESULT __disk_read(
BYTE drv, /* Physical drive nmuber (0..) */
BYTE * buff, /* Data buffer to store read data */
DWORD sector, /* Sector address (LBA) */
UINT count /* Number of sectors to read (1..255) */
)
DRESULT disk_read_dma(BYTE drv, BYTE * buff, DWORD sector, UINT count)
{
DRESULT res = RES_OK;
// this functions assumes that buff is properly aligned and in the right RAM segment for DMA
DRESULT res;
SD_Error Status;
// TRACE("disk_read %d %p %10d %d", drv, buff, sector, count);
if (SD_Detect() != SD_PRESENT) {
TRACE("SD_Detect() != SD_PRESENT");
return RES_NOTRDY;
}
if ((DWORD)buff < 0x20000000 || ((DWORD)buff & 3)) {
TRACE("disk_read bad alignment (%p)", buff);
while (count--) {
res = __disk_read(drv, (BYTE *)scratch, sector++, 1);
if (res != RES_OK) {
TRACE("disk_read() status=%d", res);
break;
}
memcpy(buff, scratch, BLOCK_SIZE);
buff += BLOCK_SIZE;
}
return res;
}
SDTransferState State;
for (int retry=0; retry<3; retry++) {
res = RES_OK;
if (count == 1) {
Status = SD_ReadBlock(buff, sector, BLOCK_SIZE); // 4GB Compliant
}
else {
Status = SD_ReadMultiBlocks(buff, sector, BLOCK_SIZE, count); // 4GB Compliant
}
if (Status == SD_OK) {
SDTransferState State;
Status = SD_WaitReadOperation(200*count); // Check if the Transfer is finished
while ((State = SD_GetStatus()) == SD_TRANSFER_BUSY); // BUSY, OK (DONE), ERROR (FAIL)
if (State == SD_TRANSFER_ERROR) {
TRACE("State=SD_TRANSFER_ERROR, c: %u", sector, (uint32_t)count);
res = RES_ERROR;
@ -183,13 +149,51 @@ DRESULT __disk_read(
TRACE("Status(ReadBlock)=%d, s:%u c: %u", Status, sector, (uint32_t)count);
res = RES_ERROR;
}
if (res == RES_OK)
break;
if (res == RES_OK) break;
sdReadRetries += 1;
}
return res;
}
DRESULT __disk_read(BYTE drv, BYTE * buff, DWORD sector, UINT count)
{
// If unaligned, do the single block reads with a scratch buffer.
// If aligned and single sector, do a single block read.
// If aligned and multiple sectors, try multi block read.
// If multi block read fails, try single block reads without
// an intermediate buffer (move trough the provided buffer)
// TRACE("disk_read %d %p %10d %d", drv, buff, sector, count);
if (SD_Detect() != SD_PRESENT) {
TRACE("SD_Detect() != SD_PRESENT");
return RES_NOTRDY;
}
DRESULT res = RES_OK;
if (count == 0) return res;
if ((DWORD)buff < 0x20000000 || ((DWORD)buff & 3)) {
// buffer is not aligned, use scratch buffer that is aligned
TRACE("disk_read bad alignment (%p)", buff);
while (count--) {
res = disk_read_dma(drv, (BYTE *)scratch, sector++, 1);
if (res != RES_OK) break;
memcpy(buff, scratch, BLOCK_SIZE);
buff += BLOCK_SIZE;
}
return res;
}
res = disk_read_dma(drv, buff, sector, count);
if (res != RES_OK && count > 1) {
// multi-read failed, try reading same sectors, one by one
TRACE("disk_read() multi-block failed, trying single block reads...");
while (count--) {
res = disk_read_dma(drv, buff, sector++, 1);
if (res != RES_OK) break;
buff += BLOCK_SIZE;
}
}
return res;
}
@ -273,12 +277,12 @@ DRESULT disk_ioctl (
switch (ctrl) {
case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
// use 512 for sector size, SDCardInfo.CardBlockSize is not sector size and can be 1024 for 2G SD cards!!!!
*(DWORD*)buff = SDCardInfo.CardCapacity / 512;
*(DWORD*)buff = SDCardInfo.CardCapacity / BLOCK_SIZE;
res = RES_OK;
break;
case GET_SECTOR_SIZE : /* Get R/W sector size (WORD) */
*(WORD*)buff = 512; // force sector size. SDCardInfo.CardBlockSize is not sector size and can be 1024 for 2G SD cards!!!!
*(WORD*)buff = BLOCK_SIZE; // force sector size. SDCardInfo.CardBlockSize is not sector size and can be 1024 for 2G SD cards!!!!
res = RES_OK;
break;