twislaandClaude Opus 5.5 3f2650c56e SD driver: a dummy byte before the ready test; say why a write failed (#21) ...

The card "refused" a write about once in 2,000 multi-block writes: three
1.7 MB uploads in ten. Measured with a driver that records where it gives
up: every time, all blocks were accepted, and the status check after Stop
Tran came back as 0xFF or 0x1F. The driver tests for ready with the first
byte after selecting the card, which reads 0xFF before the card has
signalled busy, so CMD13 went out mid-programming. A dummy byte first, as
in ChaN's reference driver, and one after Stop Tran.

30 uploads in a row since, each read back by SHA-256, ten with the radio
listening: no fault. 10 MHz made no difference; the card stays at 20 MHz.

`info` shows the driver's write faults; `put` prints the step and the
card's answer when one happens. ADR 0007.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

2026-10-05 22:55:02 +02:00

..

0001-own-firmware-speaking-meshtastic.md

M2 design: GNSS plan, glossary (GNSS Service, Fix, Track), ADR 0001 note

2026-10-04 22:00:09 +02:00

0002-own-widget-kit-on-m5gfx.md

Add domain glossary and initial architecture decisions

2026-10-01 18:25:36 +02:00

0003-own-signature-check-not-secure-boot.md

ADR 0003: the bootloader does roll back; Arduino had validated the image

2026-10-04 02:15:38 +02:00

0004-debug-console-in-debug-builds.md

Trim task stacks and buffers by measurement: +15 KB with IRC up

2026-10-04 23:02:35 +02:00

0005-safe-mode-crash-reports-watchdog.md

Safe Mode, crash reports, and a watched main loop

2026-10-04 03:07:56 +02:00

0006-framework-rebuilt-for-smaller-tls-buffers.md

Rebuild the framework with smaller TLS buffers (ADR 0006)

2026-10-04 23:32:29 +02:00

0007-own-copy-of-the-sd-driver.md

SD driver: a dummy byte before the ready test; say why a write failed (#21)

2026-10-05 22:55:02 +02:00