SD Card not working on v1.1 HW?

[mvdw]

Hi all:

I have a couple of v1.1 hardware boards, and the SD card doesn't seem to mount at all when I plug a card in. I have updated to the latest stable firmware, with the same result.

My v1.0 hardware boards behave as I expect - my computer sees the SD card when the SD card is plugged in on boot.

Has something changed with the new hardware/firmware, or am I doing it wrong, or could my boards be faulty (surely not both??).

Cheers,
MvdW

[pythoncoder]

Check the boot.py file on the SD card. Ensure it has the lines

Code: Select all

import pyb
pyb.usb_mode('CDC+MSC')

and try again.

[mvdw]

I tried again; it's irrelevant what is on the SD card as the micropython board doesn't even seem to see it. When I attach with rshell and do a "boards" command I get the following:

Code: Select all

pyboard @ COM4 connected Dirs: /flash /pyboard/flash

on the v1.1 hardware, and:

Code: Select all

pyboard @ COM6 connected Dirs: /flash /sd /pyboard/flash /pyboard/sd

on the v1.0 hardware. Both with the same SD card attached, both freshly re-imaged with the latest DFU.

[pythoncoder]

In that case I'm afraid I'm baffled; I've used several V1.1 boards without issue. With a V1.1 Pyboard here I get

Code: Select all

/home/adminpete> boards
pyboard @ /dev/pyboard connected Dirs: /flash /sd /pyboard/flash /pyboard/sd

My only thought is to try SD cards from different manufacturers. Or perhaps the connector is dirty or contaminated? Maybe someone else will suggest a way forwards.

[mvdw]

My only thought is to try SD cards from different manufacturers. Or perhaps the connector is dirty or contaminated? Maybe someone else will suggest a way forwards.

I tried several different cards with the same result; the way forward has been to desolder the v1.1 board from my motherboard and solder on a v1.0 board. I only need one to be working, but (naively it turns out) assumed that my brand new v1.1 boards would be better than the old v1.0 boards for this application...

UPDATE: I believe the safe-wash solution I was washing the boards in after soldering has contaminated the sd card socket. I have since flushed the socket with isopropanol and the boards appear to be working now. Also after flushing the serial port changed, which was strange...

MORAL: Don't use the environmentally-friendly detergent-based solution to wash your boards with the micro-sd card connectors on them

[pythoncoder]

Ha! That's why I used the word "contaminated": I once had this symptom after removing flux with IPA - evidently I'd transferred some of the flux into the connector. Washing the connector with more IPA fixed the problem.

Glad you found it

[chrismas9]

I always use Saferinse after Safewash when I do aqueous cleaning and haven't had any residue problems. Alternatively I have found hot water rinsing and compressed air drying works well. It depends on how good your tap water is.
.