cpu/stm32: add initial STM32U3 and nucleo-u385rg-q support#22175

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itsadarshnair:stm32u385-port

Commits on Apr 6, 2026

successfull make but not flashing
Adarsh Nair Mullachery
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Fixed LED and Button
Adarsh Nair Mullachery
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Makefile update nucleo64
Adarsh Nair Mullachery
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Peripheral config no I2C, PWM
Adarsh Nair Mullachery
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Update U3 BackupRAM support removed
Adarsh Nair Mullachery
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Updated U3 flash page size and write block and alignment
Adarsh Nair Mullachery
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reverting the changes made
Adarsh Nair Mullachery
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Update clock config for stm32u3
Adarsh Nair Mullachery
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AHB and APB mapping
Adarsh Nair Mullachery
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AHB and APB Updated
Adarsh Nair Mullachery
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U3 support updated
Adarsh Nair Mullachery
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Board name update
Adarsh Nair Mullachery
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Updated Doc for STM32U3RG-Q
Adarsh Nair Mullachery
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Add author and final updates
Adarsh Nair Mullachery
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cpu/stm32: address review comments
Adarsh Nair Mullachery
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fix remaining review issues
Adarsh Nair Mullachery
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Commits on Apr 12, 2026

Re-addressed and fixed the review comments
Adarsh Nair Mullachery
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Commits on Apr 26, 2026

Add U3 support to HWRNG
Adarsh Nair Mullachery
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Add stm32u3 USB FS (DRD) support in usbdev_fs
Adarsh Nair Mullachery
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enable HSI48 and route ICLK/USB1 (and RNG) on STM32U3
Adarsh Nair Mullachery
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Define U3 APB3 and FLASH_KEY1/2 in periph_cpu.h
Adarsh Nair Mullachery
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Fixing ABP3 not defined
Adarsh Nair Mullachery
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Moving FLASH KEY to flash_common.c
Adarsh Nair Mullachery
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fix STM32U3 EXTI and SYSCFG in GPIO drivers
Adarsh Nair Mullachery
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Commits on May 2, 2026

Add RTC and EXTI register mappings for STM32U3
Adarsh Nair Mullachery
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Commits on May 7, 2026

Fix Flash Peripheral key
Adarsh Nair Mullachery
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cpu/stm32/usbdev_fs: implement USB DRD support for STM32U3 family
Adarsh Nair Mullachery
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Fix EXTI IRQ and APB3 definitions for STM32U3
Adarsh Nair Mullachery
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Commits on May 9, 2026

Fix uart_init_lpuart declaration
Adarsh Nair Mullachery
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fix flash register mapping for STM32U3 resolving the 'FLASH_CR_PER' and 'FLASH_CR_PNB' compilation errors.
Adarsh Nair Mullachery
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Commits on May 10, 2026

I2C Support for stm32u385
Adarsh Nair Mullachery
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SPI support added for stm32u385
Adarsh Nair Mullachery
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Commits on May 11, 2026

PWM support added for stm32u385
Adarsh Nair Mullachery
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ADC added support for stm32u385
Adarsh Nair Mullachery
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