Add NUCLEO-F767ZI development board

[sjasonsmith]

Description

I added this so that I could verify that STM32F7 boards are able to work properly with HAL/STM32.

I did not verify all behavior, but have verified enough to feel confidant than any remaining issues would be minor.

I specifically tested:

• X Stepper Control and TMC UART communication (using SoftwareSerial)
• Flash-Emulated EEPROM
• RepRapDiscount Full Graphics display, including SD access and Speaker
• BLTouch control

Benefits

Provides a low-cost STM32F7 development platform, since the only existing STM32F7 printer boards seem to be either non-existant or difficult to obtain.

This is a proof of concept, prior to removing HAL/STM32_F4_F7.

Configurations

This is the latest configuration I used.
Configuration_NUCLEO-F767ZI.zip

Related Issues

N/A

[sjasonsmith]

@thinkyhead what are your thoughts on adding development boards such as this?

While I don't think it seems reasonable to add every development board out there, it is helpful to have low-cost hardware available. In this particular case it allows developers to do some basic testing with STM32F7 boards for $25, rather than hoping to find an actual 3D printer board with an F7 chip.

I also have an STM32H7 (480 MHz Cortex-M7) in the same form-factor, but was waiting to see how this PR was accepted prior to trying to add it.

[thinkyhead]

It's not a bad idea to support development boards, for those who might be jumping ahead. And development boards might become the basis for real boards in the future, so it gives a chance to exercise the HAL and platforms.

[Gamester17]

@sjasonsmith have you looked at the newer Nucleo-144 board series with STM32H7 series SoCs by STMicro? Please see #19751

It's not a bad idea to support development boards, for those who might be jumping ahead. And development boards might become the basis for real boards in the future, so it gives a chance to exercise the HAL and platforms.

@thinkyhead IMHO, it even economical sense when looking at newer STM32H7 based Nucleo-144 evaluation boards from STmicro as they cost about a fourth the price of the Arduino Portenta H7 which has a similar SoC. Checkout suggested boards in #19751

NUCLEO-H745ZI (NUCLEO-H745ZI-Q) board cost about $29 and comes with 480MHz + 240MHz dual-core MCU & Ethernet PHY.

[sjasonsmith]

@Gamester17 see my earlier comment:

I also have an STM32H7 (480 MHz Cortex-M7) in the same form-factor, but was waiting to see how this PR was accepted prior to trying to add it.

I expect it won’t be too hard to add. This PR only merged a day or two ago, so I haven’t time to get back to it yet.