Psas

Portland State Aerospace Society

2025 Q3

Electromechanical Recovery System

• https://docs.google.com/document/d/1DnytDlZa1X-BaIqlIBrfcuedKocKrCpTfgMspk0twxI/edit?tab=t.0

• https://github.com/psas/lv3.1-recovery/tree/master/controlSystem/RecoveryBoard . . . Kicad files

• https://drive.google.com/file/d/1qRkbDvV0_Ep7_zKsPC3GMgZicTurCPgf/view

Kicad

Link to Kicad installation instructions page.

• https://www.kicad.org/download/linux/

ERS board TODO

[ ] create board files for ERS board as of LV3.1-recovery

[ ] add device tree code to select and to enable MCU debug UART

[ ] add a DTS compatible type or entity to group GPIOs together in primary ERS dts file

Comparing flash invocation ChibiOS versus Zephyr

ChibiOS ERS make file gives:

ted@localhost:~/projects/psas/psas-avionics/lv3.1-recovery/controlSystem/RecoveryBoard/firmware$ make write
openocd -f toolchain/oocd.cfg -c "program ./build/recovery-firmware.hex verify reset exit"
Open On-Chip Debugger 0.11.0-rc2+dev-00002-g427552c07-dirty (2021-01-30-10:36)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : clock speed 1000 kHz
Info : STLINK V3J8M3B5S1 (API v3) VID:PID 0483:374F
Info : Target voltage: 3.323200
Info : stm32f0x.cpu: hardware has 4 breakpoints, 2 watchpoints
Info : starting gdb server for stm32f0x.cpu on 3333
Info : Listening on port 3333 for gdb connections
target halted due to debug-request, current mode: Thread 
xPSR: 0xc1000000 pc: 0x08000190 msp: 0x20000200
** Programming Started **
Info : device id = 0x10006442
Info : flash size = 256kbytes
** Programming Finished **
** Verify Started **
** Verified OK **
** Resetting Target **
shutdown command invoked

To flash Zephyr based app using same openocd call gives:

ted@localhost:~/projects/zephyr-project/psas-ers-firmware/samples/hello-world$ openocd -f /home/ted/projects/psas/psas-avionics/lv3.1-recovery/controlSystem/RecoveryBoard/firmware/toolchain/oocd.cfg -c "program ./build/zephyr/zephyr.hex verify reset exit"
Open On-Chip Debugger 0.11.0-rc2+dev-00002-g427552c07-dirty (2021-01-30-10:36)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : clock speed 1000 kHz
Info : STLINK V3J8M3B5S1 (API v3) VID:PID 0483:374F
Info : Target voltage: 3.312000
Info : stm32f0x.cpu: hardware has 4 breakpoints, 2 watchpoints
Info : starting gdb server for stm32f0x.cpu on 3333
Info : Listening on port 3333 for gdb connections
target halted due to debug-request, current mode: Thread 
xPSR: 0xc1000000 pc: 0x08000190 msp: 0x20000200
** Programming Started **
Info : device id = 0x10006442
Info : flash size = 256kbytes
** Programming Finished **
** Verify Started **
** Verified OK **
** Resetting Target **
shutdown command invoked

Bindings files and Zephyr

• https://docs.zephyrproject.org/latest/build/dts/bindings-intro.html

Newer way of doing things with GPIO properties, Zephyr 4.2.0 . . .

• "./dts/bindings/pinctrl/nxp,s32k3-pinctrl.yaml" 115 lines

CAN Bus Sample App

• zephyr/samples/drivers/can/babbling/src

File `zephyr/dts/arm/st/f0/stm32f091.dtsi` defines a node named `can1`. Node is disabled in this overlay file.