602c264749
Before this commit, goroutine support was spread through the compiler. This commit changes this support, so that the compiler itself only generates simple intrinsics and leaves the real support to a compiler pass that runs as one of the TinyGo-specific optimization passes. The biggest change, that was done together with the rewrite, was support for goroutines in WebAssembly for JavaScript. The challenge in JavaScript is that in general no blocking operations are allowed, which means that programs that call time.Sleep() but do not start goroutines also have to be scheduled by the scheduler.
96 строки
1,5 КиБ
Go
96 строки
1,5 КиБ
Go
// +build avr
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package runtime
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import (
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"device/avr"
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"machine"
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"unsafe"
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)
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const BOARD = "arduino"
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type timeUnit uint32
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var currentTime timeUnit
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const tickMicros = 1024 * 16384
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// Watchdog timer periods. These can be off by a large margin (hence the jump
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// between 64ms and 125ms which is not an exact double), so don't rely on this
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// for accurate time keeping.
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const (
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WDT_PERIOD_16MS = iota
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WDT_PERIOD_32MS
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WDT_PERIOD_64MS
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WDT_PERIOD_125MS
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WDT_PERIOD_250MS
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WDT_PERIOD_500MS
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WDT_PERIOD_1S
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WDT_PERIOD_2S
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)
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//go:extern _sbss
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var _sbss unsafe.Pointer
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//go:extern _ebss
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var _ebss unsafe.Pointer
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//go:export main
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func main() {
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preinit()
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initAll()
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postinit()
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callMain()
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abort()
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}
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func preinit() {
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// Initialize .bss: zero-initialized global variables.
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ptr := uintptr(unsafe.Pointer(&_sbss))
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for ptr != uintptr(unsafe.Pointer(&_ebss)) {
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*(*uint8)(unsafe.Pointer(ptr)) = 0
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ptr += 1
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}
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}
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func postinit() {
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// Enable interrupts after initialization.
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avr.Asm("sei")
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}
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func init() {
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initUART()
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}
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func initUART() {
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machine.UART0.Configure(machine.UARTConfig{})
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}
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func putchar(c byte) {
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machine.UART0.WriteByte(c)
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}
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const asyncScheduler = false
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// Sleep this number of ticks of 16ms.
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//
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// TODO: not very accurate. Improve accuracy by calibrating on startup and every
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// once in a while.
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func sleepTicks(d timeUnit) {
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currentTime += d
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for d != 0 {
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sleepWDT(WDT_PERIOD_16MS)
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d -= 1
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}
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}
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func ticks() timeUnit {
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return currentTime
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}
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func abort() {
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for {
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sleepWDT(WDT_PERIOD_2S)
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}
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}
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