Smart Garden Radio Module
Overview
This is a SoM that is used as a radio module by the GARDENA smart gateway (manual, FOSS parts).
Hardware
Silicon Labs SiM3U167-B-GM SoC
Silicon Labs Si4467 transceiver (via SPI)
Controls an RGB LED via high drive pins. It’s expected to mirror the state of 3 low-drive pins coming from the Linux SoC.
UART is connected to the Linux SoC. Usually it’s used for PPP, but it can also be used for debugging when PPP is not active.
Supported Features
The sgrm board target supports the following hardware features:
Interface |
Controller |
Driver/Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
SYSTICK |
on-chip |
systick |
DMA |
on-chip |
dma |
FLASH |
on-chip |
flash memory |
GPIO |
on-chip |
gpio |
UART |
on-chip |
serial port-polling; serial port-interrupt |
Connections and IOs
Pin |
Name |
Note |
|---|---|---|
PB0.0 |
TX (O) |
Serial connection to the Linux SoM |
PB0.1 |
RX (I) |
|
PB0.2 |
RTS (O) |
|
PB0.3 |
CTS (I) |
|
PB0.4 |
LED red (I) |
Controlled by the Linux SoM |
PB0.5 |
LED green (I) |
|
PB0.6 |
LED blue (I) |
|
PB0.13 |
TX (O) |
UART1 for debugging (no connection to Linux SoM) |
PB0.14 |
RX (I) |
|
PB4.0 |
LED red (O) |
Mirrors PB0.4 |
PB4.1 |
LED green (O) |
Mirrors PB0.5 |
PB4.2 |
LED blue (O) |
Mirrors PB0.6 |
Programming and Debugging
Flashing
The easiest way is to do this via SSH from the Linux SoM that’s connected to the SiM3U SoM.
On your building machine:
scp -O build/zephyr/zephyr.hex root@IP:/tmp/
On the gateway:
openocd -f board/gardena_radio.cfg -c 'program /tmp/zephyr.hex verify exit'
reset-rm
Debugging
The easiest way is to do this via SSH from the Linux gateway as well:
openocd -f board/gardena_radio.cfg -c init