High Speed UART RPi4

[TylerHannis]

Not really an issue, but wanted to share this setup. I was able to get HSU working on a raspberry pi 4 and elechouse chip. It is a lot faster than I2C and uses the same number of wires.

• The hardware switches on the chip board need to be set to "00".
• Plug the NFC device into 3.3v power, SCL to TXD and SDA to RXD.
• Run "sudo raspi-config" go to interfacing options -> serial.
  • Select No for terminal output, and Yes to expose hardware. Reboot.
• "sudo nano /etc/nfc/libnfc.conf"
  • device.name = "PN532_UART"
  • device.connstring = "pn532_uart:/dev/ttyS0"
    • save the file
• Run pimiibo as normal