Openocd / gdb -- quick Q (i hope)

Technology Synth-DIY
#1

i’ve seen people using stlink/SWD for programming their braids etc, so i wondered whether anybody could help me out (?)

i’m trying to program a frames – which seems to work, at least up to a point. as far as i can tell gdb isn’t complaining, but the module isn’t showing any signs of being alive. here’s the output of my gdb session (loading frames.elf):

(gdb) monitor reset halt
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0xfffffffe msp: 0xfffffffc
(gdb) load
Loading section .text, size 0x6c10 lma 0x8004000
Loading section .data, size 0x20 lma 0x800ac10
Start address 0x8004000, load size 27696
Transfer rate: 14 KB/sec, 9232 bytes/write.
(gdb) continue
Continuing.

i didn’t get the upload_combo_jtag thing to work with SWD, so i’m using openocd like so: openocd -f interface/stlink-v2.cfg -f target/stm32f1x_stlink.cfg

ie the standard interface/target scripts which come with openocd. any hints?

#2

Have you loaded the bootloader?

The processor executes code at 0x8000000 when it boots. On a working Frames, the bootloader is there. The bootloader checks if it should go into firmware update mode, otherwise it jumps to 0x8004000 where the application code starts.

#3

ah, thank you, olivier.

that was that. i’ve only seen stm32f10x.cfg has 0x8000000, but i hadn’t loaded the bootloader.

“flash write_image frames_bootloader_combo.hex” did it.