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miguelbalboa / rfid

Arduino RFID Library for MFRC522
The Unlicense
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library not working on feather M0 LoRa #461

Closed ydylwj23 closed 4 years ago

ydylwj23 commented 5 years ago

Step 1: Describe your environment

Step 2: Describe the problem

So I have been using these MFRC522 boards with Arduino UNO for a long time(Thx to your library :) ) There haven't been any big issues. Recently I decided to use feather LoRa for some RFID-RF projects so I bought some feather M0 LoRa and some feather 32u4 to play with. But I can't get it to work on feather M0 LoRa

Am I missing anything here or the library has some conflict with M0 board?

ildar commented 5 years ago

Interesting. What's the communication protocol between MCU and the RFID? Also any reference on your board might help

ydylwj23 commented 5 years ago

Here's the MCU: https://www.adafruit.com/product/3178 It has an ATSAMD21G18 ARM Cortex M0 processor.

The communication protocol is SPI which is the only protocol used on MFRC522 board

Rotzbua commented 5 years ago

@ydylwj23 Can you try version 1.3.6? There was a bug #347 which should be fixed, but maybe not..

ydylwj23 commented 5 years ago

@Rotzbua I just tried 1.3.6. It's not working. Notice that it's not the same bug: #347 is a hang bug but my bug just gives me 0x0 message.

ydylwj23 commented 5 years ago

@Rotzbua Just realized something interesting. In the header, I found the SPI clock speed is defined by a quarter of MCU's clock speed(4 MHz on 328). But since STMD chip has 3 times faster clock, a quarter would be 12 MHz which is too fast for the RFC522 chip.

`#ifndef MFRC522_SPICLOCK

define MFRC522_SPICLOCK SPI_CLOCK_DIV4 // MFRC522 accept upto 10MHz

endif`

But sadly, changing the value to half(6MHz) didn't work for me.

Rotzbua commented 5 years ago

@ydylwj23 Right, the spi clock could be the problem. Maybe some other spi specific settings are the problem. They can be found at https://github.com/miguelbalboa/rfid/blob/703a5f362e533a6cfda62dfa84538e9a6992370c/src/MFRC522.cpp#L49 .

Maybe adafruit changed something in the spi part of their toolchain. I do not see any significant change https://github.com/arduino/ArduinoCore-samd/compare/1.6.16...master , but lets give it a try.

Can you try an older toolchain? According to https://github.com/miguelbalboa/rfid/issues/347#issuecomment-364229457 I would suggest Release 1.6.16 of arduino samd https://github.com/arduino/ArduinoCore-samd/releases .

Rotzbua commented 5 years ago

I looked into the schematics: https://cdn-learn.adafruit.com/assets/assets/000/032/914/original/feather_schem.png?1465421956

The lora chip is connected to the normal (arduino) spi interface. Maybe the lora module is active at startup and must be disabled before using the spi interface for another device.

ydylwj23 commented 5 years ago

I tried turning off the radio, it doesn't help. Some more info that might be helpful:

  1. This library works with feather 32u4 LoRa. So I don't think the radio is the problem.

  2. I tried Moteino M0(same MCU as feather M0), the result is even worse: mfrc522.PCD_DumpVersionToSerial() didn't print anything for me(it didn't hang either).

Rotzbua commented 5 years ago

Did you tried the older board version of samd? (Release 1.6.16)

ydylwj23 commented 5 years ago

I don't have an Arduino samd board(Release 1.6.16). I only have a few feather M0 from Adafruit.

Rotzbua commented 5 years ago

Sorry for my misleading description. I mean software release of the tool chain and not the hardware:

Tools->Board -> Boards Manager -> select older version

https://learn.adafruit.com/add-boards-arduino-v164/installing-boards

ydylwj23 commented 5 years ago

Yes, I was looking at board configuration versions. But only Arduino samd board has an old release 1.6.16 not Adafruit. Current Arduino SAMD board version is 1.6.23; Adafruit SAMD board version is 1.4.1

Rotzbua commented 4 years ago

@ydylwj23 Can I close this?