Minimal NXP/Teensy support

Author: firelizzard18

.gitignore

@@ -5,6 +5,8 @@ src/device/avr/*.ld
 src/device/avr/*.s
 src/device/nrf/*.go
 src/device/nrf/*.s
+src/device/nxp/*.go
+src/device/nxp/*.s
 src/device/sam/*.go
 src/device/sam/*.s
 src/device/sifive/*.go

Makefile

@@ -51,7 +51,7 @@ else
     LLVM_OPTION += '-DLLVM_ENABLE_ASSERTIONS=OFF'
 endif
 
-.PHONY: all tinygo test $(LLVM_BUILDDIR) llvm-source clean fmt gen-device gen-device-nrf gen-device-avr
+.PHONY: all tinygo test $(LLVM_BUILDDIR) llvm-source clean fmt gen-device gen-device-nrf gen-device-nxp gen-device-avr
 
 LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf executionengine frontendopenmp instrumentation interpreter ipo irreader linker lto mc mcjit objcarcopts option profiledata scalaropts support target
 
@@ -118,7 +118,7 @@ fmt-check:
 	@unformatted=$$(gofmt -l $(FMT_PATHS)); [ -z "$$unformatted" ] && exit 0; echo "Unformatted:"; for fn in $$unformatted; do echo "  $$fn"; done; exit 1
 
 
-gen-device: gen-device-avr gen-device-nrf gen-device-sam gen-device-sifive gen-device-stm32
+gen-device: gen-device-avr gen-device-nrf gen-device-nxp gen-device-sam gen-device-sifive gen-device-stm32
 
 gen-device-avr:
 	$(GO) build -o ./build/gen-device-avr ./tools/gen-device-avr/
@@ -133,6 +133,10 @@ gen-device-nrf: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/NordicSemiconductor/nrfx/tree/master/mdk lib/nrfx/mdk/ src/device/nrf/
 	GO111MODULE=off $(GO) fmt ./src/device/nrf
 
+gen-device-nxp: build/gen-device-svd
+	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/NXP lib/cmsis-svd/data/NXP/ src/device/nxp/
+	GO111MODULE=off $(GO) fmt ./src/device/nxp
+
 gen-device-sam: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/Atmel lib/cmsis-svd/data/Atmel/ src/device/sam/
 	GO111MODULE=off $(GO) fmt ./src/device/sam

README.md

@@ -140,3 +140,5 @@ The original reasoning was: if [Python](https://micropython.org/) can run on mic
 This project is licensed under the BSD 3-clause license, just like the [Go project](https://golang.org/LICENSE) itself.
 
 Some code has been copied from the LLVM project and is therefore licensed under [a variant of the Apache 2.0 license](http://releases.llvm.org/10.0.0/LICENSE.TXT). This has been clearly indicated in the header of these files.
+
+Some code has been copied and/or ported from Paul Stoffregen's Teensy libraries and is therefore licensed under PJRC's license. This has been clearly indicated in the header of these files.

src/machine/board_teensy36.go

@@ -0,0 +1,39 @@
+// +build nxp,mk66f18,teensy36
+
+package machine
+
+import (
+	"device/nxp"
+)
+
+//go:keep
+//go:section .flashconfig
+var FlashConfig = [16]byte{
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xDE, 0xF9, 0xFF, 0xFF,
+}
+
+func CPUFrequency() uint32 {
+	return 180000000
+}
+
+// LED on the Teensy
+const LED Pin = 13
+
+var _pinRegisters [64]pinRegisters
+
+func init() {
+	_pinRegisters[13].Bit = 5
+	_pinRegisters[13].PCR = &nxp.PORTC.PCR5
+	_pinRegisters[13].PDOR = nxp.GPIOC.PDOR.Bit(5)
+	_pinRegisters[13].PSOR = nxp.GPIOC.PSOR.Bit(5)
+	_pinRegisters[13].PCOR = nxp.GPIOC.PCOR.Bit(5)
+	_pinRegisters[13].PTOR = nxp.GPIOC.PTOR.Bit(5)
+	_pinRegisters[13].PDIR = nxp.GPIOC.PDIR.Bit(5)
+	_pinRegisters[13].PDDR = nxp.GPIOC.PDDR.Bit(5)
+}
+
+//go:inline
+func (p Pin) registers() pinRegisters {
+	return _pinRegisters[p]
+}

src/machine/machine_nxp.go

@@ -0,0 +1,33 @@
+// +build nxp
+
+package machine
+
+import (
+	"device/arm"
+	"device/nxp"
+)
+
+type PinMode uint8
+
+const (
+	PinInput PinMode = iota
+	PinOutput
+)
+
+// Stop enters STOP (deep sleep) mode
+func Stop() {
+	// set SLEEPDEEP to enable deep sleep
+	nxp.SystemControl.SCR.SetBits(nxp.SystemControl_SCR_SLEEPDEEP)
+
+	// enter STOP mode
+	arm.Asm("wfi")
+}
+
+// Wait enters WAIT (sleep) mode
+func Wait() {
+	// clear SLEEPDEEP bit to disable deep sleep
+	nxp.SystemControl.SCR.ClearBits(nxp.SystemControl_SCR_SLEEPDEEP)
+
+	// enter WAIT mode
+	arm.Asm("wfi")
+}

src/machine/machine_nxpmk66f18.go

@@ -0,0 +1,56 @@
+// +build nxp,mk66f18
+
+package machine
+
+import (
+	"device/nxp"
+	"runtime/volatile"
+)
+
+const (
+	PortControlRegisterSRE = nxp.PORT_PCR0_SRE
+	PortControlRegisterDSE = nxp.PORT_PCR0_DSE
+	PortControlRegisterODE = nxp.PORT_PCR0_ODE
+)
+
+func PortControlRegisterMUX(v uint8) uint32 {
+	return (uint32(v) << nxp.PORT_PCR0_MUX_Pos) & nxp.PORT_PCR0_MUX_Msk
+}
+
+type pinRegisters struct {
+	Bit  uintptr
+	PCR  *volatile.Register32
+	PDOR *volatile.BitRegister
+	PSOR *volatile.BitRegister
+	PCOR *volatile.BitRegister
+	PTOR *volatile.BitRegister
+	PDIR *volatile.BitRegister
+	PDDR *volatile.BitRegister
+}
+
+// Configure this pin with the given configuration.
+func (p Pin) Configure(config PinConfig) {
+	switch config.Mode {
+	case PinInput:
+		panic("todo")
+
+	case PinOutput:
+		p.registers().PDDR.Set()
+		p.registers().PCR.SetBits(PortControlRegisterSRE | PortControlRegisterDSE | PortControlRegisterMUX(1))
+		p.registers().PCR.ClearBits(PortControlRegisterODE)
+	}
+}
+
+// Set changes the value of the GPIO pin. The pin must be configured as output.
+func (p Pin) Set(value bool) {
+	if value {
+		p.registers().PSOR.Set()
+	} else {
+		p.registers().PCOR.Set()
+	}
+}
+
+// Get returns the current value of a GPIO pin.
+func (p Pin) Get() bool {
+	return p.registers().PDIR.Get()
+}

src/runtime/runtime_nxp.go

@@ -0,0 +1,5 @@
+// +build nxp
+
+package runtime
+
+type timeUnit int64