Interesting issue with different sdcards

[blmorris]

@dhylands - that modification photo - I tip my hat to you, and I'm not easily impressed. That is some fine (in both meanings of the word) soldering work.
Would you mind sharing what microscope you used for that photo? Would you recommend it?
-Bryan

[dhylands]

@dhylands - that modification photo - I tip my hat to you, and I'm not easily impressed. That is some fine (in both meanings of the word) soldering work.
Would you mind sharing what microscope you used for that photo? Would you recommend it?
-Bryan

Thanks.

I picked up my scope about 7 years ago, as part of a group buy done by the HBRobotics club. The closest model appears to be this one:
http://www.hhip.com/10x-stereo-microsco ... stand.html

My light looks a little different, but the rest looks pretty similar. We paid $180 as part of the group buy (versus about $250 retail at the time).
I really like the scope, but I'm just a hobbyist (although I've been soldering things since I was a teenager) and I've never used anything else other than a magnifying glass for comparison. I like the fact that it has a 4-5" focal length. That gives enough room to put your board under it and maneuver tweezers, soldering iron, etc.

There are lots on ebay as well. I just did a search for "boom microscope" and this one:
http://www.ebay.com/itm/10X-20X-Widefie ... 5d4cc72a2d
looks exactly like mine (except for the logo).

[dilogic]

Sorry about that - it was the problem in my case and 10K pull-up solved it. As I said, it only happened with HC cards, though.

[Markus Gritsch]

I also do have problems with my SD cards. I described them in this bug report:
https://github.com/micropython/micropython/issues/687

[Markus Gritsch]

@dhylands: If you like, you can try the attached firmware.dfu, where I made the following experimental changes:

Code: Select all

bash-3.2$ diff -u main_orig.c main.c 
--- main_orig.c 2014-06-18 21:01:58.089046200 +0200
+++ main.c      2014-06-18 21:02:42.687597100 +0200
@@ -420,8 +420,9 @@
 
 #if MICROPY_HW_HAS_SDCARD
     // if an SD card is present then mount it on 1:/
+    HAL_Delay(100); // MGr
     if (reset_mode == 1 && sdcard_is_present()) {
-        FRESULT res = f_mount(&fatfs1, "1:", 1);
+        FRESULT res = f_mount(&fatfs1, "1:", 0); // MGr
         if (res != FR_OK) {
             printf("[SD] could not mount SD card\n");
         } else {

With them in place, my SD card get's detected nearly every time I reset the board. I would not consider it a fix though, since setting the last parameter of f_mount to 0 makes the following check obsolete since then it does not perform a read check.

I would be interested in your results nevertheless.

Cheers,
Markus

[dhylands]

Hey Markus,

I'm on a little vacation right now, and I didn't bring the bad sdcards with me, so I'll have to wait until next week to test this.

But I'm also definitely interested in the results.

I shoud be able to build with your patch.

[dhylands]

@dhylands: If you like, you can try the attached firmware.dfu, where I made the following experimental changes:

Code: Select all

bash-3.2$ diff -u main_orig.c main.c 
--- main_orig.c 2014-06-18 21:01:58.089046200 +0200
+++ main.c      2014-06-18 21:02:42.687597100 +0200
@@ -420,8 +420,9 @@
 
 #if MICROPY_HW_HAS_SDCARD
     // if an SD card is present then mount it on 1:/
+    HAL_Delay(100); // MGr
     if (reset_mode == 1 && sdcard_is_present()) {
-        FRESULT res = f_mount(&fatfs1, "1:", 1);
+        FRESULT res = f_mount(&fatfs1, "1:", 0); // MGr
         if (res != FR_OK) {
             printf("[SD] could not mount SD card\n");
         } else {

With them in place, my SD card get's detected nearly every time I reset the board. I would not consider it a fix though, since setting the last parameter of f_mount to 0 makes the following check obsolete since then it does not perform a read check.

I would be interested in your results nevertheless.

Cheers,
Markus

I tried your patch and still got mixed results. Some cards work, some don't. Reseting isn't completely consistent (with or without the patch).

[UltraBob]

Did this ever get resolved? I'm wondering if the SD card issue I'm having is the same one on this thread from a month and a half ago.

I suspect it is not the same issue because even in REPL I can't access the card. Hmmm.