Arduino for STM32

Posted: **Thu May 02, 2024 9:24 am**

Hi all

I have a RFID PN532 module with SPI and i tested it with arduino using Adafruit_PN532 library, it works ok. I'm using these pins:

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#define PN532_SCK  13                                                   
#define PN532_MOSI 11                                                   
#define PN532_SS 16                                                     
#define PN532_MISO 12                                                   
Adafruit_PN532 nfc(PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS);

Next i test it with Nucleo 64 with these pins:

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#define PN532_SCK PA5                                                   
#define PN532_MOSI PA7                                                   
#define PN532_SS PA4                                                     
#define PN532_MISO PA6                                                   
Adafruit_PN532 nfc(PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS);

but the module is not recognized. I'm using the iso14443a_uid.pde example and it fails on this point:

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  nfc.begin();
  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }

I double checked the connections and tried a second module with the same behavior, a working SPI module in arduino is not recognized on STM32.

Any idea?

Posted: **Tue May 07, 2024 7:27 am**

Hi @geologic
Looking at the library, it seems you used Software SPI.
https://github.com/adafruit/Adafruit-PN ... #L143-L145

Which relies on https://github.com/adafruit/Adafruit_Bu ... PIDevice.h
So i guess there is an issue with this, maybe linked to this:
https://github.com/adafruit/Adafruit-GF ... y/pull/359

You can try to use Hardware SPI instead. As it seems you don't mention the board you used I can't check the value of pins you used.
See this to defined properly your SPI instance with the desired pins.

Arduino for STM32

PN532 on SPI not working

PN532 on SPI not working

Re: PN532 on SPI not working