OpenHT

OpenHT - an open-source, SDR handheld transceiver

Project Plan - Proof of Concept

Aim of the PoC

Open risks (things we want to buy down quicky):

• FPGA -> MCU link bandwidth (determine protocol requirements)
• FPGA resource size (determine size requirements)
• RF characterisitics of the AT86RF215 (check for harmonics, real power output, sensitivity, image rejection)
• Overall power consumption
• Zephyr complexity / RTOS choice
• LVGL

Tests

RF usablility tests

CW test

• transmit a CW signal using the Atmel AT86RF215; vary the power output (by varying the power we get actual AM)
• Should demonstrate signal chain from STM32 -> FPGA -> RF

FM test

• receive an FM signal and successfully demodulate it
• transmit an FM signal

SSB test

• transmit an SSB signal (the last thing to test)

Platform tests

Zephyr bringup

• Should demonstrate use of Zephyr on STM32 Discovery board
• Demonstrate use of SPI and I2S peripherials

LVGL test

• Demonstrate use of LVGL on the STM32 Discovery board
• Demonstrate LVGL running on Zephyr

Hardware required for the PoC

• LIFCL-40-EVM FPGA eval board
• AT86RF215 RF eval board + an SMA antenna
• a breakout board for RF-FPGA interconnection (with SATA cables)
• STM32F469I-DISCO board (for the display and mic/spk - an interface)
• a small speaker
• a bunch of interconnection wires

Software used

• Zephyr
• Lattice Radiant (https://www.latticesemi.com/latticeradiant)

Sub Repos

firmware --> https://github.com/M17-Project/OpenHT-firmware