ab50f823dd
An optimization introduced in a04db67ea9
seems to have broken arduino uno compiled hex. Setting optimzation
flags to 1, 2, or s builds proper hex binaries though.
These patches have been the result of troubleshooting over slack:
> @aykevl
> that preinit also doesn't look right. Can you try this variant,
> with 8-bit stores instead of 32-bit stores?
> There might be some alignment issue: the _ebss might not be
> aligned resulting in ptr != unsafe.Pointer(&_ebss) never being true.
Co-authored-by: Ayke van Laethem <aykevanlaethem@gmail.com>
Co-authored-by: Jaden Weiss <jadr2ddude@gmail.com>
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 [0]byte
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//go:extern _ebss
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var _ebss [0]byte
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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 := unsafe.Pointer(&_sbss)
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for ptr != unsafe.Pointer(&_ebss) {
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*(*uint8)(ptr) = 0
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ptr = unsafe.Pointer(uintptr(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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