machine/stm32: add STM32U5 I2C support

Add I2C timing values for STM32U585 at 160MHz PCLK1 (10/100/400/500 KHz).
Add I2C1 peripheral and pin definitions to arduino-uno-q board.
Update i2c_revb build tag to include stm32u5.

src/machine/board_arduino_uno_q.go

@@ -70,4 +70,15 @@ package tmp
 
 
 
-}	UART1.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART1.handleInterrupt)func init() {)	DefaultUART = UART1	}		RxAltFuncSelector: AF7_USART1_2_3,		TxAltFuncSelector: AF7_USART1_2_3,		Bus:               stm32.USART2,		Buffer:            NewRingBuffer(),	_UART1 = UART{	UART1  = &_UART1	// debugger to be exposed as virtual COM port over USB.	// USART2 is the hardware serial port connected to the onboard ST-LINKvar ()	UART_RX_PIN = PA3	UART_TX_PIN = PA2	// PA2 and PA3 are connected to the ST-Link Virtual Com Port (VCP)	// UART pinsconst ()	BUTTON = PC13const ()	LED_GREEN   = PA5	LED_BUILTIN = LED_GREEN	LED         = LED_BUILTINconst ()	D15 = PB8	D14 = PB9	D13 = PA5	D12 = PA6	D11 = PA7	D10 = PB0	D9  = PC7	D8  = PA9	D7  = PA8	D6  = PB10	D5  = PB4	D4  = PB5	D3  = PB3	D2  = PA10	D1  = PB6	D0  = PB7	A5 = PB12	A4 = PB11	A3 = PB1	A2 = PA4	A1 = PA1	A0 = PA0	// Arduino Pinsconst ()	"runtime/interrupt"	"device/stm32"import (package machine// Arduino UNO Q board with STM32U585 processor.
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+}	UART1.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART1.handleInterrupt)func init() {)	I2C0 = I2C1	}		AltFuncSelector: AF4_I2C1_2_3_4,		Bus:             stm32.I2C1,	I2C1 = &I2C{	// I2C1 is documented, alias to I2C0 as well	DefaultUART = UART1	}		RxAltFuncSelector: AF7_USART1_2_3,		TxAltFuncSelector: AF7_USART1_2_3,		Bus:               stm32.USART2,		Buffer:            NewRingBuffer(),	_UART1 = UART{	UART1  = &_UART1	// debugger to be exposed as virtual COM port over USB.	// USART2 is the hardware serial port connected to the onboard ST-LINKvar ()	I2C0_SDA_PIN = PB9	I2C0_SCL_PIN = PB8	// I2C pins	UART_RX_PIN = PA3	UART_TX_PIN = PA2	// PA2 and PA3 are connected to the ST-Link Virtual Com Port (VCP)	// UART pinsconst ()	BUTTON = PC13const ()	LED_GREEN   = PA5	LED_BUILTIN = LED_GREEN	LED         = LED_BUILTINconst ()	D15 = PB8	D14 = PB9	D13 = PA5	D12 = PA6	D11 = PA7	D10 = PB0	D9  = PC7	D8  = PA9	D7  = PA8	D6  = PB10	D5  = PB4	D4  = PB5	D3  = PB3	D2  = PA10	D1  = PB6	D0  = PB7	A5 = PB12	A4 = PB11	A3 = PB1	A2 = PA4	A1 = PA1	A0 = PA0	// Arduino Pinsconst ()	"runtime/interrupt"	"device/stm32"import (package machine// Arduino UNO Q board with STM32U585 processor.

src/machine/machine_stm32_i2c_revb.go

@@ -1,4 +1,4 @@
-//go:build stm32l5 || stm32f7 || stm32l4 || stm32l0 || stm32wlx || stm32g0
+//go:build stm32l5 || stm32f7 || stm32l4 || stm32l0 || stm32wlx || stm32g0 || stm32u5
 
 package machine
 

src/machine/machine_stm32u585.go

@@ -44,4 +44,25 @@ package tmp
 
 
 
-}	uart.txEmptyFlag = stm32.USART_ISR_TXE	uart.statusReg = &uart.Bus.ISR	uart.txReg = &uart.Bus.TDR	uart.rxReg = &uart.Bus.RDRfunc (uart *UART) setRegisters() {// Register names vary by ST processor, these are for STM U5}	return CPUFrequency() / baudRatefunc (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {// NOTE: keep this in sync with the runtime/runtime_stm32u5.go clock init code// UART baudrate calc based on the bus and clockspeed}	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)	// enable the alternate functions on the TX and RX pins	}		stm32.PWR.SetSVMCR_IO2SV(1)		// Enable VDDIO2 power supply for PGx pins	if config.RX.getPort() == stm32.GPIOG || config.TX.getPort() == stm32.GPIOG {func (uart *UART) configurePins(config UARTConfig) {// Configure the UART.//---------- UART related codeconst APB2_TIM_FREQ = 160e6 // 160MHzconst APB1_TIM_FREQ = 160e6 // 160MHz// and clock frequencies// in sync with any changes to runtime package which configures the oscillators// Internal use: configured speed of the APB1 and APB2 timers, this should be kept}	return 160000000func CPUFrequency() uint32 {)	"device/stm32"import (package machine
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+}	}		return 0	default:		return 0x00802172	case 500 * KHz:		return 0x10802D9B	case 400 * KHz:		return 0x30A0A7FB	case 100 * KHz:		return 0xF010F3FE	case 10 * KHz:	switch br {	// TODO: Do calculations based on PCLK1	// for 160MHz PCLK1.	// These are 'magic' values calculated by STM32CubeMXfunc (i2c *I2C) getFreqRange(br uint32) uint32 {// Gets the value for TIMINGR register//---------- I2C related code}	uart.txEmptyFlag = stm32.USART_ISR_TXE	uart.statusReg = &uart.Bus.ISR	uart.txReg = &uart.Bus.TDR	uart.rxReg = &uart.Bus.RDRfunc (uart *UART) setRegisters() {// Register names vary by ST processor, these are for STM U5}	return CPUFrequency() / baudRatefunc (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {// NOTE: keep this in sync with the runtime/runtime_stm32u5.go clock init code// UART baudrate calc based on the bus and clockspeed}	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)	// enable the alternate functions on the TX and RX pins	}		stm32.PWR.SetSVMCR_IO2SV(1)		// Enable VDDIO2 power supply for PGx pins	if config.RX.getPort() == stm32.GPIOG || config.TX.getPort() == stm32.GPIOG {func (uart *UART) configurePins(config UARTConfig) {// Configure the UART.//---------- UART related codeconst APB2_TIM_FREQ = 160e6 // 160MHzconst APB1_TIM_FREQ = 160e6 // 160MHz// and clock frequencies// in sync with any changes to runtime package which configures the oscillators// Internal use: configured speed of the APB1 and APB2 timers, this should be kept}	return 160000000func CPUFrequency() uint32 {)	"device/stm32"import (package machine