diff options
Diffstat (limited to 'drivers/sdcard/sdcard.py')
| -rw-r--r-- | drivers/sdcard/sdcard.py | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/sdcard/sdcard.py b/drivers/sdcard/sdcard.py index fe402f7457..3eb62ee2fe 100644 --- a/drivers/sdcard/sdcard.py +++ b/drivers/sdcard/sdcard.py @@ -174,7 +174,7 @@ class SDCard: # read until start byte (0xff) while True: self.spi.readinto(self.tokenbuf, 0xff) - if self.tokenbuf[0] == 0xfe: + if self.tokenbuf[0] == _TOKEN_DATA: break # read data @@ -228,17 +228,22 @@ class SDCard: assert nblocks and not len(buf) % 512, 'Buffer length is invalid' if nblocks == 1: # CMD17: set read address for single block - if self.cmd(17, block_num * self.cdv, 0) != 0: + if self.cmd(17, block_num * self.cdv, 0, release=False) != 0: + # release the card + self.cs(1) raise OSError(5) # EIO - # receive the data + # receive the data and release card self.readinto(buf) else: # CMD18: set read address for multiple blocks - if self.cmd(18, block_num * self.cdv, 0) != 0: + if self.cmd(18, block_num * self.cdv, 0, release=False) != 0: + # release the card + self.cs(1) raise OSError(5) # EIO offset = 0 mv = memoryview(buf) while nblocks: + # receive the data and release card self.readinto(mv[offset : offset + 512]) offset += 512 nblocks -= 1 |