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rgrr / yapicoprobe

Yet Another Picoprobe
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Overclock issue with new RP2040 #101

Closed phb98 closed 9 months ago

phb98 commented 10 months ago

I got a new patch of rp2040 (03-22). After flashing FW it does not boot at all( No LED flashing, no usb emulation). That FW is running fine on older RP2040 (04-20).

Rebuild the FW with lower CPU clock (PROBE_CPU_CLOCK_MHZ = 192MHz) and the MCU boot just fine, try 216 Mhz and it becomes unstable(Random freeze).

Maybe considering a lower clock speed if it's does not affect performance much. I only use DAP and CDC and did not notice any difference between 2 clock speed yet(SWD was running at 20Khz)

rgrr commented 10 months ago

Hello phb98

thanks for reporting this. In an upcoming version I will lower standard CPU frequency to something more reasonable.

Don't know if you are aware of fine-tuning CPU freq: if the probe starts up, one can set CPU frequency via configuration: https://github.com/rgrr/yapicoprobe#runtime-configuration-of-probe-parameters

Concerning performance: there seems to be some bigger USB performance step between 192MHz and 216MHz. Don't know why.

Do you know, if this is just a new batch or is it also a new chip revision?

phb98 commented 10 months ago

Hi I have only tested 1 so far, so i can not confidentally if this apply to all new rp2040, maybe i'm just unlucky. But still running at twice default clock does not sound reliable to me. Last thing i want when debugging my project is debugging my debugger.

rgrr commented 9 months ago

105 closes this