ebiroll/dragino_lm502

This project provides an example for the dragino LM502 LoRaWAN module running on the demo board.

dragino_LM502

This project provides an example for the dragino LM502 LoRaWAN module running on the demo board.

Datasheet http://www.dragino.com/downloads/index.php?dir=LM502/

Demo board

The demo board contains an ST32F103C08TC running CMIS-DAP https://os.mbed.com/handbook/CMSIS-DAP and the LM502 module that contains a 32-Bit RISC MCU CY8C4147AXI-S445 https://www.cypress.com/part/cy8c4147axi-s445 from Cypres and a SX1262 https://www.semtech.com/uploads/documents/DS_SX1261-2_V1.1.pdf LoRa Modem

Builing

The official toolchain for the cypress MCU is PSOC creator.

I was hoping that it would be possible to use the generated sources with platfotm io, https://platformio.org/ However, this might not be so easy without adding custom startup files as we do not want the stm32 low_level init functions to run at startup.

Cypress MCU

The official IDE for the cypress MCU is PSOC creator. https://www.cypress.com/documentation/other-resources/psoc-creator-user-guide The PSOC creator uses a modified version of cmsis 5.0 https://developer.arm.com/tools-and-software/embedded/cmsis

copy the *.c and *.h files in the Generated directory as well as the cyapicallbacks.h file to src directory. Also add main.c

Debugging

The ST32F103 comes preflashed with cmsis-dap firmware but if you want to build your own, you could try this https://github.com/devanlai/dap42 , make sure you use the correct pins to connect to the LM502 SWD pins.

ST Pin Name	Module pim
PA_4	SWD_CLK
PA_2	SWD_DATA
PA_9	RX1
PA_10	TX1

https://docs.platformio.org/en/latest/plus/debug-tools/cmsis-dap.html

Running in qemu

It seems like the linker scripts sets the correct reset handler, This means that we probably can use our platform-io build as it is.

emu-system-arm -nographic  -d unimp   -cpu cortex-m0 -machine cubieboard -kernel .pioenvs/demo_lm502/firmware.elf  -S -s

arm-none-eabi-gdb  .pioenvs/demo_lm502/firmware.elf
(gdb) target remote:1234
(gdb) where
#0  Reset () at src/Cm0plusStart.c:378

(gdb) b    cyfitter_cfg();
(gdb) b ClockSetup

Info

https://www.embedded.com/design/mcus-processors-and-socs/4026075/Building-Bare-Metal-ARM-Systems-with-GNU-Part-2

https://github.com/platformio/platformio-core/commit/1e21d6e05bbbeb0cc682eca9b0f1bc5e5e180b5f

~/.platformio/platforms/ststm32/builder/frameworks/cmsis.py