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Seeed-Studio / WioLTE_Cat_NB1_Arduino_Library

LTE Cat NB1 dev board using ublox SARA-R4 02B and STM32F405RGT6
MIT License
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Danger to brick your SARA modem! #10

Open oe1gca opened 4 years ago

oe1gca commented 4 years ago

You can easily brick your modem due to the really bad design of the u-blox SARA R410M! Be aware of this info from u-blox:

u-blox System Integration manual:

⚠An abrupt removal of the VCCsupply during SARA-R4 seriesmodules normal operations may lead to an unrecoverable faulty state!

And unrecoverable in this regard means: it can't be re-flashed - you can dispose it !

So, take care when switching of the board!

petemyron commented 2 years ago

What's the experience when this happens? I can write to the board (for example, the Sample sketch), but it seems to keep crashing when trying to power up the module:

17:30:42.622 -> 00:00:00.228 WARN modem.h:28:modem_setup() Powering on module...00:00:00.228 WARN modem.h:23:modem_setup() Arduino setup() starting up
17:30:45.584 -> 00:00:00.228 WARN modem.h:28:modem_setup() Powering on module...00:00:00.228 WARN modem.h:23:modem_setup() Arduino setup() starting up
...
17:31:24.666 -> 00:0