QUERY · ISSUE

sdcard.py - OSError: timeout waiting for response

openby Leniwcowatyopened 2021-03-18updated 2024-09-08

drivers

I am using 8 GB microSD card, format FAT32. During mount code detects it as v2 card, but gives "OSError: timeout waiting for response". Tried to format as 4 GB FAT, did not work.
Raspberry Pi Pico

CANDIDATE · PULL REQUEST

drivers/sdcard: raise exception instead of infinite loop on read failure

closedby jeremyherbertopened 2019-11-04updated 2019-11-06

In the SPI SD card driver, the code can get stuck in an infinite loop if the SD card fails to respond to a read. This patch changes it to a timeout+exception instead.

Assessment

S Sonnet · high

PR #5287 is the origin of the exact error message the user sees in issue #7051. The PR converted an infinite loop into a timeout+exception, producing "OSError: timeout waiting for response". The user in #7051 is hitting that exception, which means the PR is already applied. However, PR #5287 does not fix the underlying cause — it only surfaces the failure cleanly. Issue #7051 is about SD card v2 initialization failing on RP2040, a distinct bug in the init/detection logic. The two items share the same component and error string but address different problems.

Suggested action

Leave issue #7051 open. It is triggered by the exception introduced in PR #5287 but the root cause — v2 card initialization failure on Raspberry Pi Pico — is not addressed by that PR. Reference #5287 in a comment for context, and investigate sdcard.py init/CMD sequence for RP2040 timing or v2 card compatibility issues.

sdcard.py - OSError: timeout waiting for response

drivers/sdcard: raise exception instead of infinite loop on read failure

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