Missing peripheral support

[AlexCharlton]

MPFS peripherals that mpfs-hal does not yet support (though they are all accessible to some degree through mpfs-pac):

• USB host mode (complete pending release of embassy USBH support: See https://github.com/AlexCharlton/mpfs-hal/tree/usbh)
• UART Rx (done in 9346171)
• PCIe
• SPI master mode (done in 5f2ce04)
• SPI slave mode
• I2C
• CAN

Board-specific

BeagleV-Fire:

• eMMC
• SPI flash
• ADC (via SPI)
• EEPROM (via I2C)
• MIPI CSI (via gateware)
• High-speed connector (via gateware)
• Additional GPIO (via gateware)

Other boards...

[AlexCharlton]

Contributions welcome!

[marcantoinem]

Amazing work, I'm interested in contributing the PDMA engine, it allows to copy from the DDR to AXI so it is quite useful for high speed transfer between the fabric and the CPU. mpfs-pac is really great for quick experimentation, but is it worth it to start porting in Rust directly the MSS Microchip component? For example the PDMA is only about 500~ lines of C consisting mostly of writing to register translating this is Rust would be quite easy. Also, as the main branch is usb-h live should I wait for it to be merged in main or should I directly base on the usb-h branch.

Thanks again for this port of embassy!

[AlexCharlton]

Thanks, @marcantoinem!

I'm interested in contributing the PDMA engine

That'd be great!

mpfs-pac is really great for quick experimentation, but is it worth it to start porting in Rust directly the MSS Microchip component?

My approach thus far has been to take the path of least resistance. In some cases this has meant implementing peripherals more or less from scratch in Rust (e.g. SPI, which only relies on mpfs-pac for constants), while some (USB, ETH) leverage MSS code more substantially. The PDMA code sure looks like there's not much to be gained by using the MSS functions.

should I directly base on the usb-h branch

usb-h has become a defacto main branch with MANY non-USB related improvements/additions. The good news is that the embassy USB host functionality was just merged into main earlier this week. In fact, I think I'll use that as an excuse to merge usb-h into main. We'll still need to wait for an embassy release before the next mpfs-hal release, but it should just be a matter of time now!