Doesn't Work, "Unexpected data" error

[frak0d]

I have the same boards as shown in README, a Nodemcu with ch340 chip and a STM8S103F3P6. I have double checked the wiring. And yes i have the pullup resistor in right place.

I am now trying to flash a blink.ihx that I got from SDCC compiler.

But it keeps failing with Unexpected data: xx (replace xx with random hex values)

I have tried flashing with both stm8flash and python/flash.py, both giving the same error.
I also tried setting 115200 baud rate in src/user/user_main.c and in libespstlink.c, still same error in both flashing tools.
I also tried with and without pullup resistor, same error.
I also tried reducing delay in read_byte as suggested in #18 , still same error.

am i doing something wrong ?

[rumpeltux]

It could also be that your power supply is not strong enough, what’s your host system?
And you do definitely need the pullup resistor.

[frak0d]

Host is a Asus Tuf A15 laptop.

My powering setup is like:
Laptop USB Port --> NodeMCU LDO --> stm8s103f3p6

NodeMCU's LDO seems to be providing 1A of constant current (and 1.5A peaks) according to my multimeter, so i doubt its a power supply issue.

the onboard micro usb of stm8 was not connected to anything.

---

Edit: It turns out my stm8 board is a badly designed clone, and the GND among the swim headers wasn't connected to anything. i fixed that by connecting it to the other GND pin as recommended in sduino docs. the power led now lights up while connected to nodemcu.

However it still fails to program with same error.

[rumpeltux]

Sorry, to further debug I’d probably attach this to a scope to see what’s going. Without that nothing I can do. If you figure it out, let me know or send a patch if it’s a software issue.

[frak0d]

I got myself a STLINK-V2 Clone, but even with that stlink and stm8flash are unable to connect to SWD.

Only thing that worked for me was ST Visual Programmer (STVP) on windows.
(weirdly enough, it also fails to connect on first 2 tries, but then works fine after that)

Compiling in Arduino IDE and then flashing in STVP is inconvenient, but atleast it works.