CMWX1ZZABZ and RadioHead library

Projects General Guidance
1

Has anyone gotten the RadioHead library to work with the CMWX1ZZABZ module? I can compile, but the initialization of the Lora radio fails. I suspect I may not properly selecting the slave select? I can't find any documenation describing how the processor and the radio module are connected.

Greg

2

bigredbee:
I can't find any documenation describing how the processor and the radio module are connected.

Who supplied the module ?

Are they not able to supply documentation ?

3

The module is from Murata. There's all sorts of documentation on their website, but nothing that I can find that describes how the microcontroller is connected to the radio module (it's some sort of multi-chip module). I know it's SPI, but I can't figure out which line they use for the slave select

4

What convinced you to select such a poorly documented module, and why do you think Radiohead will work with it?

5

I chose this module because it has a TXCO, giving it better performance with large spreading factors. I wouldn't go so far as to say it's poorly documented, but I just I can't find the details I'm looking for. Radiohead should work, it was written for the Semtech Lora radio chip that lives on the module.

6

I chose this module because it has a TXCO, giving it better performance with large spreading factors.

The main benefit of a TXCO is to allow the device to work with lower bandwidths.

Frequency drift is more of an issue at higher spreading factors, but the low datarate optimisation setting deals with that quite well on devices with standard crystals.

7

You can look at the source code of the examples for the ST LoRa discovery board.

It is a little tedious but you will find your way to the pin used for chip select and other purposes.

The board is based on the Murata module.

The software is for LoRaWAN but the interface of the SX1276 is available in the source code.

Good luck !

Pascal

8

BigRedBee,

I am also interested in the result of your search.

Did you succeed running Radiohead library on the Murata module ?

Kind regards,

Pascal

9

I'm also wondering if anyone has produced a CMWX1ZZABZ driver for Radiohead?

10

The Radiohead support for LoRa modules (RH_RF95) is for the standard SPI based modules.

There is this;