stm32f723 related issues

[jeandet]

Few issues related to stm32f723 (maybe others f7)

• it has a single precision FPU while modm builds with -mfpu=fpv5-d16 instead of -mfpu=fpv5-sp-d16
• the integrated USB HS phy seems not totally supported/initialized
• USB D+ and D- in USB HS are initialized with Gpio::OutputSpeed::High instead of Gpio::OutputSpeed::VeryHigh

I'll try to PR fixes soon.

[salkinium]

1. Single vs dual precision in F7 is generated here originally.
2. Yup, I didn't find a F723 device with the built-in USB HS PHY in my possession, so couldn't test it.
3. Huh, it's probably also wrong for USB FS?

[jeandet]

@salkinium, thx for the information, I'm actually working on a custom board, I just ordered an stm32f723 discovery board so I'll be able to PR some examples too.
For 1, I think I should spend some time checking which models have double precision FPU and see if there is any rule from the reference.
I'm also considering making a PR for adding meson build since I'm the QTC meson plugin dev and an hardcore QTC user, would you be open for this too?

[salkinium]

I'm also considering making a PR for adding meson build since I'm the QTC meson plugin dev and an hardcore QTC user, would you be open for this too?

YES PLEASE! I like meson, and I'm very happy to help the porting, since I wrote the make and scons one (we don't speak about the cmake one 😒).

[salkinium]

I've updated the modm-devices submodule to include your changes in this repo, so at least point 1 should be fixed now.

[salkinium]

Btw, the initialization for the USB HS PHY was fixed in #1264.