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<Corvus>
Hey, guys. A quick question. Does the ft232r driver support SWD transport or is it only capable of JTAG?
<Corvus>
I sorta want to bitbang SWD.
<PaulFertser>
Corvus: hi. Currently JTAG only.
<PaulFertser>
Corvus: you can bitbang SWD with GPIOs of a single board computer (e.g. raspberrypi).
<PaulFertser>
Probably you have other hardware potentially usable as an SWD adapter?
<Corvus>
PaulFertser: yeah, I have a raspi pico on the way, and I've seen a someone turning it into an SWD probe, the problem is, that's the board I want to SWD. Maybe I should get a second one
<PaulFertser>
Corvus: I mean a regular raspberrypi can bitbang SWD.
<PaulFertser>
Corvus: on the pico you can debug one core by dedicating the other to communication with OpenOCD, see picoprobe.
<Corvus>
yeah, I've seen that too, but it's a bit expensive to buy it just to turn into an SWD probe
<Corvus>
Oh!
<PaulFertser>
Corvus: probably you have a "bluepill" stm32 board?
<Corvus>
Really?
<Corvus>
No, I don't. Let's get back to using one core for debugging the other...
<Corvus>
PaulFertser: You mentioned I can use an stm32 as an SWD adapter. There's some software that'd need to run on it, right?
<PaulFertser>
Corvus: yes, there exist some ports of daplink / cmsis-dap firmware on stm32 boards.
<Corvus>
and their ST-Link only works with stm mcu's, right?
<PaulFertser>
Corvus: stlink v2 has no limitations like that, stlink v3 does but can be reflashed with independent daplink firmware.
<Haohmaru>
stlink3 is locked to ST targets
<Corvus>
Oh, that's cool, I can get an st-link v2 cheaper than chips.
<PaulFertser>
:)
<PaulFertser>
Corvus: some stlink v2 clones from China are using stm32f101 even though that part doesn't have USB officially :) Also some of them have RESET signal misrouted so stlink firmware can't really control the target pin.
<Corvus>
so I can get an STM32F103C8T6 or a chinese st-link2 for the same chips price
<PaulFertser>
Corvus: one thing to note: stlink v2 doesn't support multi-drop SWD so not really suitable for rp2040 as is.
<Corvus>
hm... I assume there's an stm32 firmware that does?
<PaulFertser>
Corvus: I'd recommend sparing a bit more money and getting TUMPA (ft2232h-based multi function adapter with fast JTAG buffer, RS-232 etc)
<Corvus>
yeah, I was looking at them, but it's like... it's not superexpensive, but it's expensive enough for me to start thinking if there's a cheaper option. It's roughly like 4 rp2040
<PaulFertser>
I found it handy for many different usecases. If you can get rp2040 for reasonably cheap, then you do not really need any stm32 I think.
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<Corvus>
yeah, rp2040 is about 4 bucks. stm32f103 is about half that, but I don't really like them much, they don't have usb-otg
<karlp>
the f4 boards do though
<Corvus>
and I like usb host mode
<karlp>
leave f1 in the last century please.
<PaulFertser>
Yes, no reason to buy f103 these days other than for some project that's already fully implemented.
<Corvus>
karlp: yes, but f4's are more expensive than rp2040
<karlp>
you do you.
<Corvus>
karlp: haha, I'm sure I have a couple of atmega's 328p. That's what really needs to be left in the last century
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