ChibiOS Free Embedded RTOS

Hi, It is a silicon limitation, from the STM32F1xx reference manual: "In low, medium, high and XL-density devices, the USB and CAN share a dedicated 512-byte SRAM memory for data transmission and reception, and so they cannot be used concurrently (the shared RAM is accessed through CAN and USB ...

Hi,

The tool is embedded in ChibiStudio, see https://www.playembedded.org for guides.

Alternatively there is a script /os/hal/boards/genboard.sh that generates the files starting from an XML description, it requires installation of the FMPP utility.

Giovanni

Hi,

The STM32F4 does not have a DMAMUX so peripherals use specific DMA channels, you need to check the Reference Manual and see if there are alternative channels that can be used in your case. There is a table with mapping in the DMA chapter.

Giovanni

The PHY could require some extra initialization.

Giovanni

Great thanks, moving this topic in "bug reports" so it is not lost.

Giovanni

It could be a SW issue, ULPI has not extensively tested.

Giovanni

Do you have a MACv1 board to try? (anything except H7).

Not sure how to test this.

Giovanni

Next step is to understand if there is a driver problem or an HW issue. Are you using MACv1 or MACv2?

Giovanni

You should try to verify if it is the MAC driver delaying the frame or if it is a problem within lwIP or its integration layer.

One possible approach is to flip a GPIO from the MAC ISR, send periodic packets and look with a scope if the ISR occurs immediately.

Giovanni

Hi,

Thanks, this could be related but currently I don't have HW to test this.

Giovanni