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mayeranalytics / pySX127x

This is a python interface to the Semtech SX127x, HopeRF RFM9x, Microchip RN2483 long range, low power transceiver families.
GNU Affero General Public License v3.0
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AssertionError #36

Closed Stefan213 closed 3 years ago

Stefan213 commented 3 years ago

My project has worked 4 months ago, but i haven't used it since. I am now using a PCB and when i execute the test_lora.py programm i get following error:

======================================================= FAIL: test_mode (main.TestSX127x)

Traceback (most recent call last): File "test_lora.py", line 43, in wrapper func(self) File "test_lora.py", line 62, in test_mode self.assertEqual(lora.get_mode(), m) AssertionError: 128 != 129

Thank you in advance.

mayeranalytics commented 3 years ago

The assertion tests whether the chip is indeed in the state it should be in. When that is not the case usually there is a SPI communication problem.

Stefan213 commented 3 years ago

Do you know how to pin down the problem?

mayeranalytics commented 3 years ago

Back to basics: Directly use Wiring-Pi (I assume it's a rasp) and write, then read, some register, e.g. the mode register.

Stefan213 commented 3 years ago

I tested this and everything works. I also tested the transceiver with an Arduino and it worked perfectly fine. On the Raspberry it still does not work.

Stefan213 commented 3 years ago

If i run rx_cont there are no errors but i dont receive any packets.

mayeranalytics commented 3 years ago

I don't really know how to debug this for you remotely. I can only repeat what I already said: Ignore the library for the moment and try to establish communication on the Raspberry using the simplest setup possible.

Stefan213 commented 3 years ago

I checked the SPI Communications with an Oscilloscope and everything was as it should be.

mayeranalytics commented 3 years ago

Have they maybe brought out a new chip version? (What Raspberry are you using anyway? I'm sitting on a collection of Rasp 2s and 3s. Rasp 4 isn't that appealing to me so I don't even have one.)

Stefan213 commented 3 years ago

It doesn't seem like there is a new version. I am using a Raspberry 3B+.

oliverpaadik commented 3 years ago

I actually ran into similar issue the other day. Thought that the module itself is faulty, but connecting a new one to RPi and running the test, I got the same assertion error. However, this doesn't cause any issues with creating a communication link between two modules -- so in your case, maybe the problem lies somewhere else as well?

Stefan213 commented 3 years ago

I finally found the error. I was testing another transceiver and it worked, so i took a closer look on the other one and the crystal oscillator was missing. I wonder why it was missing.

Thank you for your support, i am very happy that i finally can close this issue.