Where to start STM32H7 support

[Giovanni]

I will look into D+, probably that is the reason.

Giovanni

[rounin]

I'm interested in this part too, for the CAN FD and USB HS support. I'm going to start tinkering with the CAN module in a few days when the dev kit gets here, but I'm new to ChibiOS so it might take me a while. (mainly used FreeRTOS in the past, on MPC57xx parts).

[DEHiCKA]

Hi,
I committed a demo for STM32H7 using the OTGv1 driver, it compiles (after some changes) but it still does not work.
OTG registers always read back as zero like it is, somehow, not reachable, I suspect there is some missing configuration or configuration error. OTG clocks are enabled, I am stuck...
Has anybody managed to enable OTG already?
Giovanni

I've finally figured it out. VDD33USB is tied to VDD and USB regulator must be turned off.
Just remove PWR_CR3_USBREGEN from STM32_PWR_CR3 define in mcuconf.

Need to bleach my brain know, after dumpster diving in cubemx generated crap.
Hell of a contrast with how well chibios is written!

[Giovanni]

Thanks for finding, I haven't had a chance to touch that for a while...

I will apply the fix, next step would be to write a new OTG driver able to leverage DMAs, H7 has those on both OTGs.

Giovanni

[Giovanni]

Hi,

I committed the change, it is working. Thanks for finding this, it was driving me crazy.

Giovanni

[DEHiCKA]

No problem. Is there any example/test involving ADCv4?
I've briefly tried to set it up, DR is updating, but DMA is not working.

[Giovanni]

Hi,

It is not tested yet this is why there is no test application, I will give it a try.

Giovanni

[DEHiCKA]

Ah, sorry, my bad. Will wait till it is ready then.

[maciek]

Hi,

I'm trying to test which features are working on H7. I've got it for GPIO and UARTs. Now examining I2C, it's not easy because there is no working example and I'm not that experienced to write everything without any helpers. Two questions:

-how to initialize I2CConfig for v3? I've found the following options for F3, but probably it should be different for H7?

static const I2CConfig i2c1_config = {

// STM32_TIMINGR_PRESC(15U) |
// STM32_TIMINGR_SCLDEL(4U) | STM32_TIMINGR_SDADEL(2U) |
// STM32_TIMINGR_SCLH(15U) | STM32_TIMINGR_SCLL(21U),
STM32_TIMINGR_PRESC(8U) | STM32_TIMINGR_SCLDEL(3U) | STM32_TIMINGR_SDADEL(3U) |
STM32_TIMINGR_SCLH(3U) | STM32_TIMINGR_SCLL(9U),
0,
0
};


-do I need to explicitely initialize pads for SCL and SDA? I mean palSetPadMode. Or if I don't do this, the default ones will work for the given I2C port, as defined in board.h?

[Giovanni]

Hi,

The peripheral is the same in F3 so it should be similar, the exact values have to be calculated, details are in the STM32 Reference Manual.

GPIO settings can be done in board.h or at runtime using the PAL driver. Check if your board.h already does this, if not use PAL functions.

Giovanni