Sigfox Protocol Physical Layer for S2-LP - Demo for HT Micron HT32SX

renard-phy-s2lp-demo-ht32sx is demo application for the open source Sigfox PHY layer renard-phy-s2lp for HT Micron's HT32SX, which is a system-in-package (SiP) that integrates both STMicroelectronics' S2-LP ultra-low power transceiver chip and an STM32L0 microcontroller.

It combines renard-phy-s2lp and renard-phy-s2lp's STM32L0 hardware abstraction layer renard-phy-s2lp-hal-stm32.

Building

Clone

Make sure to clone this repository recursively so that all submodules get downloaded as well:

git clone --recursive https://github.com/Jeija/renard-phy-s2lp-demo-ht32sx/

If you forgot --recursive while cloning, you can also use the following command to initialize all submodules:

git submodule update --init --recursive

Configure

See renard-phy-s2lp-hal-stm32 for information on the default pin configuration and on how to change it.

Compile

Make sure you have stlink and the GNU ARM Toolchain (arm-none-eabi) installed. To compile and flash this demo application, use:

make
make stlink-flash

Usage

renard-phy-s2lp-demo-ht32sx assumes a button connected to GPIOB 5 and an LED connected to GPIOB 0. It transmits a Sigfox uplink whenever that button is pressed (modify src/button.c or src/main.c to change button / LED pinouts). The application then waits for a downlink and outputs the received downlink frame on the serial console UART2 (GPIOA 2 is TX, GPIOA 3 is RX, default baudrate is 115200 Bd). Watch the serial console for debug output!

renard-phy-s2lp-demo-ht32sx loads the factory-provisioned Sigfox credentials from the STM32L0's internal EEPROM, so make sure your EEPROM is not corrupted! It currently does not support Sigfox's NVM format, which means that Sigfox sequence numbers will start from 0 after flashing and you will have to disengage the sequence number in Sigfox's backend.

KiCad schematics and a PCB reference design for my development board can be found in the ht32sx-nano repository.

HT32SX Internal Pinout

STM32L0 to S2-LP

S2-LP Pin Name	STM32L0 Pin
MISO (SPI)	GPIOB 4
MOSI (SPI)	GPIOA 7
SCLK (SPI)	GPIOB 3
CS (SPI)	GPIOA 15
SDN	GPIOB 8
GPIO3	GPIOB 2

S2-LP to SKY66420-11 Front-End Module (FEM)

SKY66420-11	S2-LP Pin
CSD	GPIO2
CTX	GPIO0
CPS	GPIO1

Licensing

renard-phy-s2lp-demo-ht32sx is licensed under the MIT License. See LICENSE for details.