MCUXpresso IDE中的主题 Re: SWO performance understanding

SWO performance understanding

auftrag2021 — Thu, 03 Mar 2022 22:42:33 GMT

Hello,

I am monitoring a ADC signal on SWO Data Watch, and I got this:

what is the reason, the sine wave below has these sawtooth? the input signal is very clean. If I use printf to send out the ADC signal via UART to PC serial terminal, I also can get a very clean sine wave. It is obviouly not the ADC conversion problem.

Only with SWO, I always got these sawtooth wave, and the data loss is also terrible.

p.s. the input frequency is only 10Hz

What did I do wrong? below is my SWO buffer setup

Re: SWO performance understanding

Alice_Yang — Fri, 04 Mar 2022 09:27:17 GMT

Hello,

How about refer to the guide <MCUXpresso_IDE_SWO_Trace> to change the configuration settings to test.

Alice

Re: SWO performance understanding

auftrag2021 — Mon, 07 Mar 2022 00:28:15 GMT

I tried many times the "default settings", it won't help.

I think I didn't get the function principle of SWO correctly.

for PRINTF, I send the signal out only actively. But by the SWO, the "system" alway tracking down the signal but the sampling time is unclear (when? how often?)

Re: SWO performance understanding

lpcxpresso_supp — Wed, 09 Mar 2022 14:27:46 GMT

Hi,

Can you please let us know what MCUX IDE version do you use, what target/device and what debug probe? We want to reproduce the problem.

Regards,

MCUXpresso Support IDE

Re: SWO performance understanding

auftrag2021 — Wed, 09 Mar 2022 16:12:53 GMT

My HW: RT1170EVK

SW IDE MCUXpresso 11.5.0

Iam using the On-board debug probe, firmware alreday updated to