This happens directly at the moment I plug the USB cable in the device, tested both on different computers (windows and linux) and with different USB cables. When this error appears, the calculator is then stuck. The only way out is to remove the USB cable and press the reset button on the back.
Here are a few notes:
This also happen when I do "Activate USB disk" before plugging the cable in.
If I put it in while on the "About" screen after reset, it doesn't throw an error directly, but after dismissing the screen get stuck on "Checking QSPI contents …"
I manage, sometimes, to make USB work with this procedure:
Press the reset button and wait for the "About" screen to appear
Prepare the USB cable close to the plug
Dismiss the about screen by pressing "Exit" and quickly insert the USB cable
Some other messages I got while trying to make it work:
Oops, I've crashed! Please, try
to reproduce it, then report the
steps taken and following info:
Hard Fault
r0=10005a0c r1=00000040
r2=00000000 r3=00000000
r12=00000001 lr=ffffffed
pc=00f00000 psr=00010029
This is strange, I have the exact same problem since this morning :
It worked perfectly fine since I received my unit in december. Then, I made the upgrade to 3.7 firmware, and now, as soon as I plug the usb cable, the error appears and the calculator freezes. I have to press reset to reboot it. It works until I plug the USB cable again...
I managed to downgrade to 3.5 firmware by removing the back case and pressing PRGM+RESET to get into bootloader mode, then flashing the old firmware with dfu-util.
With the 3.5 firmware everything seems to be back to normal, I can access my FAT disk again so it seems not to be a hardware problem
I'm not sure if I can reupgrade to 3.7 now.... Is it really safe ?
I just connected my DM42 running f/w Ver 3.71 to my PC via USB cable with no trouble; it worked as expected, files on Flash were visisble to the PC, etc. so the issue reported above is not present in all 3.7 f/w DM42 machines. I don't doubt that the 2 reports are real problems, I just wanted to verify and confirm that this problem is *NOT* present in all machines.
I just connected my DM42 running f/w Ver 3.71 to my PC via USB cable with no trouble; it worked as expected, files on Flash were visisble to the PC, etc. so the issue reported above is not present in all 3.7 f/w DM42 machines. I don't doubt that the 2 reports are real problems, I just wanted to verify and confirm that this problem is *NOT* present in all machines.
Same here, tried multiple times, on different ports, on a MacBookPro running 10.13.5 without any error.
I tried to upgrade to 3.7 again. I double checked the upgrade procedure, I downloaded the files again, compared the checksums, they were OK. I upgraded the DMCP then the program... and I am back into trouble, same error again when I plug the USB cable. So the problem is reproducible and has something to do with the 3.7 firmware.
... and yes, I tried different cables with different computers.
The problem seems to come from the DMCP part because I compiled the Hello world program. It works but the calculator still crashes when I plug the USB cable