About BRP

BRP · 2024-10-18

Working on an audio device using STM32H750 with USB3300, using TinyUSB stack.Either it works perfectly, or there is no ULPI communication.In the latter state, STP, DIR and NXT are all solid high and nothing moves. I can unlock it by pausing the progr...

BRP · 2024-01-31

Hi all,I'm experimenting on an STM32F723disco board, trying out some audio DSP. I seem to be getting abysmal processing speed.So as a first sanity check I did a simple nop timing test:Turn on a GPIO pin, do 50 nops, turn the GPIO pin off. (By 50 nops...

BRP · 2024-10-18

Thanks! I'm aware of the erratum. In this application those two pins are used as inputs so a current limit is not a problem.It's actually fortuitous that the analogue switch is there because it allowed me to to disconnect OTG_HS_ULPI_DIR temporarily ...

BRP · 2024-02-02

Hi,I think it's odd that ST doesn't turn on all the bells and whistles by default but I'm happy I worked it out.The other thing I hadn't seen coming (but in retrospect might have) is that nops get dual-issued, hence the half cycle per instruction wit...

BRP · 2024-02-01

Looks like I found it. The default settings when you start a project has ART, Prefetch, DCache and ICache disabled. I haven't tested all combos but it seems ICache was the one that made the difference.Without it, a nop averages 1.6 cycles. With it, 0...

BRP · 2024-02-01

With a 216MHz clock I'm expecting the "100 nop" pulse to be 231ns longer than the "50 nop" pulse. In reality, the length difference is 480 ns. So, 50 nops take 480 ns, That is what I am trying to understand.I've just not been able to do *any* test th...

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STM32H750 + USB3300 ULPI deadlock

Clock speed, instruction timing not squaring up

Re: STM32H750 + USB3300 ULPI deadlock

Re: Clock speed, instruction timing not squaring up

Re: Clock speed, instruction timing not squaring up

Re: Clock speed, instruction timing not squaring up