Detector App freezes when starting FRAM while LMIC driver is in operation

dniklaus commented 3 years ago

Issue by dniklaus Thu Aug 30 10:32:10 2018 Originally opened as https://github.com/ERNICommunity/dust-measurement-network/issues/31

Actual Behavior Adafruit FRAM I2C driver start renders the detector firmware application to be frozen while LMIC driver (LoRaWan RFM95 module driver) is in operation.

Expected Behaviour The operation of all drivers must be possible w/o any interference issues.

Steps to reproduce

Run the Detector FW with the LMIC driver in service
Start I2C Bus (Wire.begin())
Heartbeat LED stops blinking, CLI on USB Serial shows no reaction

Possible Workarounds

for the MVP (2 detector nodes, we prepare 10 nodes), use a GPIO 5-bit wired device ID to distinguish between the devices, provide hardcoded TTN Keys for all 5 nodes, and provision the device's own tuple according to the GPIO 3 bit device ID, GPIO bits (#41):
- Bit 0: Pin A0 (14)
- Bit 1: Pin A1 (15)
- Bit 2: Pin A2 (16)
- Bit 3: Pin A3 (17)
- Bit 4: Pin A4 (18)
try to use SPI instead of the I2C bus, replace the Adafruit FRAM I2C with an Adafruit FRAM SPI
review the I2C HW, especially pull-up resistors (4k7), consider also other potential error sources as mentioned here: https://github.com/arduino/ArduinoCore-samd/issues/194#issuecomment-269444283

dniklaus commented 3 years ago

Comment by dniklaus Wed Nov 7 11:23:16 2018

@ithuerin have you already started working on this?

dniklaus commented 3 years ago

Comment by dniklaus Mon Jan 21 13:07:58 2019

@ithuerin The workaround (first point mentioned above) is implemented now (available in master branch).

dniklaus commented 3 years ago

Fix by #79a942e32aa79ed76d2de15ddf3c5feec7bf3870.

apply new LoRa configuration
restart LoRaWan Driver after accessing FRAM

ERNI-CoP-IoT / dust-measurement-network

Detector App freezes when starting FRAM while LMIC driver is in operation #35