diff options
| -rw-r--r-- | drivers/sdcard/sdcard.py | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/sdcard/sdcard.py b/drivers/sdcard/sdcard.py index e51a594d8e..a3372e3152 100644 --- a/drivers/sdcard/sdcard.py +++ b/drivers/sdcard/sdcard.py @@ -51,10 +51,12 @@ class SDCard: for i in range(16): self.spi.send(0xff) - # CMD0: init card; should return R1_IDLE_STATE (allow 2 attempts) - if self.cmd(0, 0, 0x95) != R1_IDLE_STATE: - if self.cmd(0, 0, 0x95) != R1_IDLE_STATE: - raise OSError("no SD card") + # CMD0: init card; should return R1_IDLE_STATE (allow 5 attempts) + for _ in range(5): + if self.cmd(0, 0, 0x95) == R1_IDLE_STATE: + break + else: + raise OSError("no SD card") # CMD8: determine card version r = self.cmd(8, 0x01aa, 0x87, 4) |