Bering-uClibc 6.x - User Guide - Advanced Topics - Simpler setup using the PI's serial port ttyAMA0

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Raspberry PI serial port

All Raspberry PIs have at least a serial comm. port available on GPIO pins 14 (tx) and 15 (rx) that can be connected to a ttl-rs232 converter, try using one with the MAX3232 chip as it works for 5 or 3.3 volts. You then only need to properly manage the jumper cables between the PI's GPIO pins and the rs232 converter. To talk to the serial port you will then have use /dev/ttyAMA0.

An interesting and amusing setup is with the inexpensive and miniature RPI Zero W. In LEAF 7.0.1 you can find https://sourceforge.net/projects/leaf/files/Bering-uClibc/7.0.1/Bering-uClibc_PiZ.img/download image that you will copy on an SD card, using dd or Raspberry PI imager. .... to be continued ...