// +build stm32f7x2 package machine // Peripheral abstraction layer for the stm32f407 import ( "device/stm32" ) func CPUFrequency() uint32 { return 216000000 } //---------- UART related code // Configure the UART. func (uart *UART) configurePins(config UARTConfig) { // enable the alternate functions on the TX and RX pins config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.AltFuncSelector) config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.AltFuncSelector) } // UART baudrate calc based on the bus and clockspeed // NOTE: keep this in sync with the runtime/runtime_stm32f7x2.go clock init code func (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 { var clock uint32 switch uart.Bus { case stm32.USART1, stm32.USART6: clock = CPUFrequency() / 2 // APB2 Frequency case stm32.USART2, stm32.USART3, stm32.UART4, stm32.UART5: clock = CPUFrequency() / 8 // APB1 Frequency } return clock / baudRate } // Register names vary by ST processor, these are for STM F7x2 func (uart *UART) setRegisters() { uart.rxReg = &uart.Bus.RDR uart.txReg = &uart.Bus.TDR uart.statusReg = &uart.Bus.ISR uart.txEmptyFlag = stm32.USART_ISR_TXE }