Signed-off-by: deadprogram <ron@hybridgroup.com>
machine/stm32u585: fix PWR peripheral clock was never enabled
On STM32U5, PWR is on AHB3 and requires RCC.AHB3ENR.PWREN -
unlike some other STM32 families where PWR is always clocked.
Without this, all writes to PWR registers (including IO2SV for
VDDIO2) were silently dropped, so GPIOG pins could never drive.
Signed-off-by: deadprogram <ron@hybridgroup.com>
target: correct I2C pin mapping for Arduino UNO Q
Signed-off-by: deadprogram <ron@hybridgroup.com>
Add machine-level support for STM32U5 family: GPIO ports A-I with clock
enables via AHB2ENR1, EXTI pin interrupts (individual EXTI0-15 IRQs),
timer definitions (TIM1-8, TIM15-17), RNG, and alternate function clock
enables for all peripherals.
Add UART support with STM32U585 baud rate and register configuration.
Add arduino-uno-q board pin definitions and USART2 serial.
Update shared build tags: gpio_revb, gpio_reva, exti_exti, exti_syscfg.
deadprogram