mirror of
https://github.com/tinygo-org/tinygo.git
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Ayke van Laethem
41e501aaf4
The timeUnit is now the same type everywhere. Move it to a single place and add some documentation to it.
63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
//go:build tkey
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// This file implements target-specific things for the TKey.
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package runtime
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import (
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"device/tkey"
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"machine"
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"runtime/volatile"
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)
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//export main
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func main() {
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preinit()
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initPeripherals()
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run()
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exit(0)
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}
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// initPeripherals configures peripherals the way the runtime expects them.
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func initPeripherals() {
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// prescaler value that results in 0.00001-second timer-ticks.
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// given an 18 MHz processor, a millisecond is about 18,000 cycles.
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tkey.TIMER.PRESCALER.Set(18 * machine.MHz / 100000)
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machine.InitSerial()
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}
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func putchar(c byte) {
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machine.Serial.WriteByte(c)
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}
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func getchar() byte {
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for machine.Serial.Buffered() == 0 {
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Gosched()
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}
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v, _ := machine.Serial.ReadByte()
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return v
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}
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func buffered() int {
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return machine.Serial.Buffered()
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}
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var timestamp volatile.Register32
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// ticks returns the current value of the timer in ticks.
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func ticks() timeUnit {
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return timeUnit(timestamp.Get())
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}
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// sleepTicks sleeps for at least the duration d.
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func sleepTicks(d timeUnit) {
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target := uint32(ticks() + d)
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tkey.TIMER.TIMER.Set(uint32(d))
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tkey.TIMER.CTRL.SetBits(tkey.TK1_MMIO_TIMER_CTRL_START)
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for tkey.TIMER.STATUS.Get() != 0 {
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}
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timestamp.Set(target)
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}
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