60 строки
1,4 КиБ
Go
60 строки
1,4 КиБ
Go
// +build stm32
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package machine
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// Peripheral abstraction layer for the stm32.
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const (
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portA Pin = iota * 16
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portB
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portC
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portD
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portE
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portF
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portG
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portH
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portI
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portJ
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)
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// Peripheral operations sequence:
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// 1. Enable the clock to the alternate function.
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// 2. Enable clock to corresponding GPIO
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// 3. Attach the alternate function.
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// 4. Configure the input-output port and pins (of the corresponding GPIOx) to match the AF .
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// 5. If desired enable the nested vector interrupt control to generate interrupts.
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// 6. Program the AF/peripheral for the required configuration (eg baud rate for a USART) .
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// Given that the stm32 family has the AF and GPIO on different registers based on the chip,
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// use the main function here for configuring, and use hooks in the more specific chip
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// definition files
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// Also, the stm32f1xx series handles things differently from the stm32f0/2/3/4
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// ---------- General pin operations ----------
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type PinChange uint8
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const (
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PinRising PinChange = 1 << iota
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PinFalling
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PinToggle = PinRising | PinFalling
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)
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// Set the pin to high or low.
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// Warning: only use this on an output pin!
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func (p Pin) Set(high bool) {
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port := p.getPort()
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pin := uint8(p) % 16
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if high {
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port.BSRR.Set(1 << pin)
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} else {
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port.BSRR.Set(1 << (pin + 16))
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}
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}
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// Get returns the current value of a GPIO pin.
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func (p Pin) Get() bool {
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port := p.getPort()
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pin := uint8(p) % 16
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val := port.IDR.Get() & (1 << pin)
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return (val > 0)
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}
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