ITM/`iprint` send data in 32-bit chunks

Question

ITM/`iprint` send data in 32-bit chunks

japaric opened this issue 8 years ago · 4 comments

Be careful with alignment.

Answer 1 · 2016-10-28T16:19:45.000Z

Note to self: benchmark this with the time module

Answer 2 · 2016-11-04T20:01:14.000Z

Have you noticed any problems losing output when sending data quickly? I'm running the same code on the F4 and sometimes lose characters.

I have a feeling that it may be dropping it on the ST-Link side, unfortunately.

Answer 3 · 2016-11-04T22:20:05.000Z

Have you noticed any problems losing output when sending data quickly?

Not yet but I haven't tried high throughput either.

I wouldn't expect it to lose data though. The iprintln has a busy wait loop in it to prevent queuing more data if the bus is already busy. I'd expect that to "throttle" the data rate.

I have a feeling that it may be dropping it on the ST-Link side, unfortunately.

FWIW, the ST-LINK is an STM32F1 device and I doubt it's clocked at a high frequency.

Answer 4 · 2017-08-02T04:33:17.000Z

Done in cortex-m some time ago.