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Ayke van Laethem
2f1f8fb075
It is always implemented exactly the same way (as an uint8) so there is no reason to implement it in each target separately. This also makes it easier to add some documentation to it.
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
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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// 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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