59 строки
1,7 КиБ
Go
59 строки
1,7 КиБ
Go
// +build stm32f7x2
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package machine
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// Peripheral abstraction layer for the stm32f407
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import (
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"device/stm32"
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)
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func CPUFrequency() uint32 {
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return 216000000
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}
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// Internal use: configured speed of the APB1 and APB2 timers, this should be kept
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// in sync with any changes to runtime package which configures the oscillators
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// and clock frequencies
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const APB1_TIM_FREQ = 54e6 // 54MHz
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const APB2_TIM_FREQ = 216e6 // 216MHz
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//---------- UART related code
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// Configure the UART.
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func (uart *UART) configurePins(config UARTConfig) {
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// enable the alternate functions on the TX and RX pins
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config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
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config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
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}
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// UART baudrate calc based on the bus and clockspeed
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// NOTE: keep this in sync with the runtime/runtime_stm32f7x2.go clock init code
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func (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {
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var clock uint32
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switch uart.Bus {
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case stm32.USART1, stm32.USART6:
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clock = CPUFrequency() / 2 // APB2 Frequency
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case stm32.USART2, stm32.USART3, stm32.UART4, stm32.UART5:
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clock = CPUFrequency() / 8 // APB1 Frequency
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}
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return clock / baudRate
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}
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// Register names vary by ST processor, these are for STM F7x2
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func (uart *UART) setRegisters() {
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uart.rxReg = &uart.Bus.RDR
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uart.txReg = &uart.Bus.TDR
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uart.statusReg = &uart.Bus.ISR
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uart.txEmptyFlag = stm32.USART_ISR_TXE
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}
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//---------- I2C related code
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// Gets the value for TIMINGR register
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func (i2c *I2C) getFreqRange() uint32 {
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// This is a 'magic' value calculated by STM32CubeMX
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// for 27MHz PCLK1 (216MHz CPU Freq / 8).
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// TODO: Do calculations based on PCLK1
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return 0x00606A9B
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}
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