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machine: add helpers for bit-banged driver support

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The returned pointer and value can be used to set or clear a specific
pin.
This commit is contained in:
Ayke van Laethem
2018-10-15 19:56:27 +02:00
parent 392bba8394
commit ccee42ec7a
1 changed files with 14 additions and 0 deletions
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src/machine/machine_nrf.go
+14
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@@ -34,6 +34,20 @@ func (p GPIO) Set(high bool) {
} }
} }
// Return the register and mask to enable a given GPIO pin. This can be used to
// implement bit-banged drivers.
func (p GPIO) PortMaskSet() (*uint32, uint32) {
port, pin := p.getPortPin()
return (*uint32)(&port.OUTSET), 1 << pin
}
// Return the register and mask to disable a given port. This can be used to
// implement bit-banged drivers.
func (p GPIO) PortMaskClear() (*uint32, uint32) {
port, pin := p.getPortPin()
return (*uint32)(&port.OUTCLR), 1 << pin
}
// Get returns the current value of a GPIO pin. // Get returns the current value of a GPIO pin.
func (p GPIO) Get() bool { func (p GPIO) Get() bool {
port, pin := p.getPortPin() port, pin := p.getPortPin()