PN532 not working over I2C

[Fido789]

Hello!

I try to connect PN532 NFC reader to ESP32 (ESP_REV0) over I2C, but getting "Can't find a PN532" exception. Data pin is 25 and clock pin is 26, this should be the default for bus 2.

I tried to run I2C scanner from here https://docs.nanoframework.net/samplesdetails/I2C/NanoI2cScanner/README.html to find an address of my PN532. All addresses are returning Write: 4, transferred: 0, Read: 2, transferred: 0 except for 0x24 and 0A4, they are returning Write: 2, transferred: 0, Read: 1, transferred: 1.

Hello from I2C Scanner!
0x23 Write: 4, transferred: 0, Read: 2, transferred: 0
0x23 - Absent
0x24 Write: 2, transferred: 0, Read: 1, transferred: 1
0x24 - Absent
0x25 Write: 4, transferred: 0, Read: 2, transferred: 0
0x25 - Absent

So what does it mean? How can I fix it? Maybe it is something similar to #1113

[Ellerbach]

Hi! Just to make sure, are you setting up properly the bus:

Configuration.SetPinFunction(25, DeviceFunction.I2C1_DATA);
Configuration.SetPinFunction(26, DeviceFunction.I2C1_CLOCK);
Pn532 pn532 = new Pn532(I2cDevice.Create(new I2cConnectionSettings(1, Pn532.I2cDefaultAddress)));

Setting up the pins is mandatory.