A workaround for crashes when trying to use SAMD5x FPU on windows version of tinygo

enablefpu.go

// +build atsamd51

// Put this file in the main package directory
// https://github.com/tinygo-org/tinygo/issues/944#issuecomment-597065613
// http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0439b/BEHBJHIG.html

package main

import (
	"runtime/volatile"
	"unsafe"
)

func init() {
	enableCortexM4FPU()
}

func enableCortexM4FPU() {
	cpacraddr := (*uint32)(unsafe.Pointer(uintptr(0xE000ED88)))
	tmp := *cpacraddr
	tmp |= (0xF << 20)
	volatile.StoreUint32(cpacraddr, tmp)
}