Chain JTAG, mutli-mcu programming with nrf52?

[SRA]

I'm just checking because search didn't have hits.

Has anyone used JTAG "chain" programming to flash two micros on the same circuit? I assume the nrf52s won't hold this up, but I'm not sure.

Anyone?

[Nguyen Hoan Hoang]

nRF52 uses SWD. It does not support jtag chains. SWD is peer to peer, no chaining. However there is a solution to parallel programming nRF52 using multiple low cost programmer here.

[Roger Clark]

The programmer you linked to is not particularly cheap.

If you are willing to do the work to compile the code, you can build a BlackMagic Probe, using a $4 STLink (STM32) dongle and the code from github.com/.../blackmagic

In terms of programming 2 devices via one connector. AFIK its not possible, But as SWD is only 2 wires, you could add an extra 2 wires to your connector and have separate SWCLK and SWDIO lines for both processors (assuming they are both ARM type and use SWD)

In fact, I suspect you can probably share the SWCLK line between both (though you'd need to double check this)