Direct serial port access to Zigbee?

[fonix232]

A project I’m working on requires direct communication with the Zigbee module instead of the MALOS Gateway wrapper. According to the official documentation, the Zigbee module is exposed to the 40 pin connector in a JTAG chain (alongside with the main MCU, I presume for updates), and also over UART to the FPGA. This UART access would be preferable for my application, however I can’t seem to find any documentation about accessing this UART port from the host Raspberry.

Is it possible? I presume I’d have to write my own FPGA script to do the UART forwarding, though I might be wrong. Unfortunately the documentation is pretty barebones regarding Zigbee, unless used with the MALOS gateway.

[Samreen]

@fonix232,

Apologies for the delayed response, I somehow missed your post.

Here are some resources that may helpful for you in directly communicating with Zigbee IC through UART.

• Zigbee rx and tx connections to the FPGA
• The Raspberry Pi UART rx and tx connections in the FPGA
• The two lines in the FPGA that directly connects the Zigbee chip to RPi UART
• The script for Zigbee programming
• The openOCD files for the em358 (Zigbee chip) setup
• JTAG-wise, the FPGA, MCU and Zigbee chip are on the same JTAG chain with the following pin connections (see here)
  JTAG_TMS <-> RPi GPIO4
  JTAG_TCK <-> RPi GPIO17
  JTAG_TDO <-> RPi GPIO27
  JTAG_TDI <-> RPi GPIO22

Hope this helps! Let me know if you have further questions.

Best,
Samreen