WIP: support for the CH32V003 chip

Signed-off-by: deadprogram <ron@hybridgroup.com>

.gitignore

@@ -17,6 +17,8 @@ src/device/kendryte/*.go
 src/device/kendryte/*.s
 src/device/rp/*.go
 src/device/rp/*.s
+src/device/wch/*.go
+src/device/wch/*.s
 vendor
 llvm-build
 llvm-project

GNUmakefile

@@ -185,7 +185,7 @@ 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-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp
+gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp gen-device-wch
 ifneq ($(STM32), 0)
 gen-device: gen-device-stm32
 endif
@@ -237,6 +237,10 @@ gen-device-renesas: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/tinygo-org/renesas-svd lib/renesas-svd/ src/device/renesas/
 	GO111MODULE=off $(GO) fmt ./src/device/renesas
 
+gen-device-wch: build/gen-device-svd
+	./build/gen-device-svd -source=https://github.com/ch32-rs/ch32-rs/ lib/cmsis-svd/data/WCH-Community/ src/device/wch
+	GO111MODULE=off $(GO) fmt ./src/device/wch
+
 # Get LLVM sources.
 $(LLVM_PROJECTDIR)/llvm:
 	git clone -b tinygo_xtensa_release_18.1.2 --depth=1 https://github.com/tinygo-org/llvm-project $(LLVM_PROJECTDIR)
@@ -783,6 +787,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=maixbit             examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=nanoch32v003        examples/blinky1
+	@$(MD5SUM) test.hex
 ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/export
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/main

builder/builder_test.go

@@ -27,6 +27,7 @@ func TestClangAttributes(t *testing.T) {
 		"cortex-m33",
 		"cortex-m4",
 		"cortex-m7",
+		"ch32v003",
 		"esp32c3",
 		"fe310",
 		"gameboy-advance",

compiler/atomic.go

@@ -1,9 +1,6 @@
 package compiler
 
 import (
-	"fmt"
-	"strings"
-
 	"tinygo.org/x/go-llvm"
 )
 
@@ -15,20 +12,6 @@ func (b *builder) createAtomicOp(name string) llvm.Value {
 	case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
 		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
 		val := b.getValue(b.fn.Params[1], getPos(b.fn))
-		if strings.HasPrefix(b.Triple, "avr") {
-			// AtomicRMW does not work on AVR as intended:
-			// - There are some register allocation issues (fixed by https://reviews.llvm.org/D97127 which is not yet in a usable LLVM release)
-			// - The result is the new value instead of the old value
-			vType := val.Type()
-			name := fmt.Sprintf("__sync_fetch_and_add_%d", vType.IntTypeWidth()/8)
-			fn := b.mod.NamedFunction(name)
-			if fn.IsNil() {
-				fn = llvm.AddFunction(b.mod, name, llvm.FunctionType(vType, []llvm.Type{ptr.Type(), vType}, false))
-			}
-			oldVal := b.createCall(fn.GlobalValueType(), fn, []llvm.Value{ptr, val}, "")
-			// Return the new value, not the original value returned.
-			return b.CreateAdd(oldVal, val, "")
-		}
 		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAdd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
 		// Return the new value, not the original value returned by atomicrmw.
 		return b.CreateAdd(oldVal, val, "")

compiler/syscall.go

@@ -33,18 +33,17 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 				"{r10}",
 				"{r8}",
 				"{r9}",
-				"{r11}",
-				"{r12}",
-				"{r13}",
 			}[i]
 			llvmValue := b.getValue(arg, getPos(call))
 			args = append(args, llvmValue)
 			argTypes = append(argTypes, llvmValue.Type())
 		}
+		// rcx and r11 are clobbered by the syscall, so make sure they are not used
 		constraints += ",~{rcx},~{r11}"
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 		target := llvm.InlineAsm(fnType, "syscall", constraints, true, false, llvm.InlineAsmDialectIntel, false)
 		return b.CreateCall(fnType, target, args, ""), nil
+
 	case b.GOARCH == "386" && b.GOOS == "linux":
 		// Sources:
 		//   syscall(2) man page
@@ -71,6 +70,7 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 		target := llvm.InlineAsm(fnType, "int 0x80", constraints, true, false, llvm.InlineAsmDialectIntel, false)
 		return b.CreateCall(fnType, target, args, ""), nil
+
 	case b.GOARCH == "arm" && b.GOOS == "linux":
 		// Implement the EABI system call convention for Linux.
 		// Source: syscall(2) man page.
@@ -103,6 +103,7 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 		target := llvm.InlineAsm(fnType, "svc #0", constraints, true, false, 0, false)
 		return b.CreateCall(fnType, target, args, ""), nil
+
 	case b.GOARCH == "arm64" && b.GOOS == "linux":
 		// Source: syscall(2) man page.
 		args := []llvm.Value{}
@@ -135,6 +136,7 @@ func (b *builder) createRawSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 		target := llvm.InlineAsm(fnType, "svc #0", constraints, true, false, 0, false)
 		return b.CreateCall(fnType, target, args, ""), nil
+
 	default:
 		return llvm.Value{}, b.makeError(call.Pos(), "unknown GOOS/GOARCH for syscall: "+b.GOOS+"/"+b.GOARCH)
 	}
@@ -217,6 +219,7 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		retval = b.CreateInsertValue(retval, syscallResult, 0, "")
 		retval = b.CreateInsertValue(retval, errResult, 2, "")
 		return retval, nil
+
 	default:
 		return llvm.Value{}, b.makeError(call.Pos(), "unknown GOOS/GOARCH for syscall: "+b.GOOS+"/"+b.GOARCH)
 	}

go.mod

@@ -19,7 +19,7 @@ require (
 	go.bug.st/serial v1.6.0
 	golang.org/x/net v0.26.0
 	golang.org/x/sys v0.21.0
-	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d
+	golang.org/x/tools v0.22.1-0.20240621165957-db513b091504
 	gopkg.in/yaml.v2 v2.4.0
 	tinygo.org/x/go-llvm v0.0.0-20240518103902-697964f2a9dc
 )
@@ -45,5 +45,3 @@ require (
 	github.com/spf13/afero v1.11.0 // indirect
 	golang.org/x/text v0.16.0 // indirect
 )
-
-replace golang.org/x/tools => github.com/tinygo-org/tools v0.0.0-20240612102102-36af80766fc9

go.sum

@@ -80,8 +80,6 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/tinygo-org/tools v0.0.0-20240612102102-36af80766fc9 h1:t8VQNFa68kSA8ze7gi8kSxF22a7/vmr1OtOPLvgO3+8=
-github.com/tinygo-org/tools v0.0.0-20240612102102-36af80766fc9/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
 go.bug.st/serial v1.6.0 h1:mAbRGN4cKE2J5gMwsMHC2KQisdLRQssO9WSM+rbZJ8A=
 go.bug.st/serial v1.6.0/go.mod h1:UABfsluHAiaNI+La2iESysd9Vetq7VRdpxvjx7CmmOE=
 golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
@@ -99,6 +97,8 @@ golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
 golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
+golang.org/x/tools v0.22.1-0.20240621165957-db513b091504 h1:MMsD8mMfluf/578+3wrTn22pjI/Xkzm+gPW47SYfspY=
+golang.org/x/tools v0.22.1-0.20240621165957-db513b091504/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=

goenv/version.go

@@ -9,7 +9,7 @@ import (
 
 // Version of TinyGo.
 // Update this value before release of new version of software.
-const version = "0.32.0"
+const version = "0.33.0-dev"
 
 var (
 	// This variable is set at build time using -ldflags parameters.

loader/goroot.go

@@ -236,6 +236,7 @@ func pathsToOverride(goMinor int, needsSyscallPackage bool) map[string]bool {
 		"device/":               false,
 		"examples/":             false,
 		"internal/":             true,
+		"internal/binary/":      false,
 		"internal/bytealg/":     false,
 		"internal/fuzz/":        false,
 		"internal/reflectlite/": false,

src/device/riscv/handleinterrupt.S

@@ -1,3 +1,6 @@
+// We don't support RV32E at the moment.
+#if !defined(__riscv_32e)
+
 #ifdef __riscv_flen
 #define NREG 48
 #define LFREG flw
@@ -128,3 +131,5 @@ handleInterruptASM:
     LREG    ra, 0*REGSIZE(sp)
     addi    sp, sp, NREG*REGSIZE
     mret
+
+#endif

src/internal/binary/binary.go

@@ -0,0 +1,32 @@
+// Package binary is a lightweight replacement package for encoding/binary.
+package binary
+
+// This file contains small helper functions for working with binary data.
+
+var LittleEndian = littleEndian{}
+
+type littleEndian struct{}
+
+// Encode data like encoding/binary.LittleEndian.Uint16.
+func (littleEndian) Uint16(b []byte) uint16 {
+	return uint16(b[0]) | uint16(b[1])<<8
+}
+
+// Store data like binary.LittleEndian.PutUint16.
+func (littleEndian) PutUint16(b []byte, v uint16) {
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+}
+
+// Append data like binary.LittleEndian.AppendUint16.
+func (littleEndian) AppendUint16(b []byte, v uint16) []byte {
+	return append(b,
+		byte(v),
+		byte(v>>8),
+	)
+}
+
+// Encode data like encoding/binary.LittleEndian.Uint32.
+func (littleEndian) Uint32(b []byte) uint32 {
+	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}

src/internal/task/task_stack_tinygoriscv.S

@@ -1,5 +1,8 @@
 //go:build tinygo
 
+// We don't support RV32E at the moment.
+#if !defined(__riscv_32e)
+
 .section .text.tinygo_startTask
 .global  tinygo_startTask
 .type    tinygo_startTask, %function
@@ -69,3 +72,5 @@ tinygo_swapTask:
 
     // Return into the task.
     ret
+
+#endif

src/machine/board_nanoch32v003.go

@@ -0,0 +1,5 @@
+//go:build nanoch32v003
+
+package machine
+
+const LED = PD6

src/machine/machine_atsamd21.go

@@ -10,8 +10,8 @@ import (
 	"bytes"
 	"device/arm"
 	"device/sam"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 	"runtime/interrupt"
 	"unsafe"
 )

src/machine/machine_atsamd51.go

@@ -10,8 +10,8 @@ import (
 	"bytes"
 	"device/arm"
 	"device/sam"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 	"runtime/interrupt"
 	"unsafe"
 )

src/machine/machine_ch32v003.go

@@ -0,0 +1,72 @@
+//go:build ch32v003
+
+package machine
+
+import "device/wch"
+
+const deviceName = wch.Device
+
+const (
+	PA0 Pin = 0 + 0
+	PA1 Pin = 0 + 1
+	PA2 Pin = 0 + 2
+	PA3 Pin = 0 + 3
+	PA4 Pin = 0 + 4
+	PA5 Pin = 0 + 5
+	PA6 Pin = 0 + 6
+	PA7 Pin = 0 + 7
+	PC0 Pin = 16 + 0
+	PC1 Pin = 16 + 1
+	PC2 Pin = 16 + 2
+	PC3 Pin = 16 + 3
+	PC4 Pin = 16 + 4
+	PC5 Pin = 16 + 5
+	PC6 Pin = 16 + 6
+	PC7 Pin = 16 + 7
+	PD0 Pin = 24 + 0
+	PD1 Pin = 24 + 1
+	PD2 Pin = 24 + 2
+	PD3 Pin = 24 + 3
+	PD4 Pin = 24 + 4
+	PD5 Pin = 24 + 5
+	PD6 Pin = 24 + 6
+	PD7 Pin = 24 + 7
+)
+
+const (
+	PinInput  PinMode = 0
+	PinOutput PinMode = 3
+)
+
+func (p Pin) getPortPin() (port *wch.GPIO_Type, pin uint32) {
+	portNum := uint32(p) >> 3
+	pin = uint32(p) & 0b111
+	switch portNum {
+	case 0:
+		port = wch.GPIOA
+	case 2:
+		port = wch.GPIOC
+	case 3:
+		port = wch.GPIOD
+	}
+	return
+}
+
+func (p Pin) Configure(config PinConfig) {
+	port, pin := p.getPortPin()
+	reg := port.CFGLR.Get()
+	reg &^= (0xf << (4 * pin))
+	reg |= 0b0000 << (4 * pin)
+	reg |= 0b11 << (4 * pin)
+	port.CFGLR.Set(reg)
+}
+
+// Set the pin to high or low.
+func (p Pin) Set(high bool) {
+	port, pin := p.getPortPin()
+	if high {
+		port.BSHR.Set(1 << pin)
+	} else {
+		port.BCR.Set(1 << pin)
+	}
+}

src/machine/machine_nrf.go

@@ -5,7 +5,7 @@ package machine
 import (
 	"bytes"
 	"device/nrf"
-	"encoding/binary"
+	"internal/binary"
 	"runtime/interrupt"
 	"unsafe"
 )

src/machine/machine_stm32f4.go

@@ -6,8 +6,8 @@ package machine
 
 import (
 	"device/stm32"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 	"math/bits"
 	"runtime/interrupt"
 	"runtime/volatile"

src/machine/machine_stm32l4.go

@@ -4,8 +4,8 @@ package machine
 
 import (
 	"device/stm32"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 	"runtime/interrupt"
 	"runtime/volatile"
 	"unsafe"

src/machine/machine_stm32wlx.go

@@ -6,8 +6,8 @@ package machine
 
 import (
 	"device/stm32"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 	"math/bits"
 	"runtime/interrupt"
 	"runtime/volatile"

src/machine/usb/descriptor/configuration.go

@@ -1,7 +1,7 @@
 package descriptor
 
 import (
-	"encoding/binary"
+	"internal/binary"
 )
 
 const (

src/machine/usb/descriptor/device.go

@@ -1,7 +1,7 @@
 package descriptor
 
 import (
-	"encoding/binary"
+	"internal/binary"
 )
 
 const (

src/machine/usb/descriptor/endpoint.go

@@ -1,7 +1,7 @@
 package descriptor
 
 import (
-	"encoding/binary"
+	"internal/binary"
 )
 
 var endpointEP1IN = [endpointTypeLen]byte{

src/machine/usb/descriptor/hid.go

@@ -2,8 +2,8 @@ package descriptor
 
 import (
 	"bytes"
-	"encoding/binary"
 	"errors"
+	"internal/binary"
 )
 
 var configurationCDCHID = [configurationTypeLen]byte{

src/runtime/asm_riscv.S

@@ -1,3 +1,6 @@
+// We don't support RV32E at the moment.
+#if !defined(__riscv_32e)
+
 #if __riscv_xlen==64
 #define REGSIZE 8
 #define SREG sd
@@ -50,3 +53,5 @@ tinygo_longjmp:
     lw sp, 0(a0)       // jumpSP
     lw a1, REGSIZE(a0) // jumpPC
     jr a1
+
+#endif

src/runtime/runtime_ch32v003.go

@@ -0,0 +1,75 @@
+//go:build ch32v003
+
+package runtime
+
+import (
+	"device/wch"
+	"runtime/volatile"
+)
+
+//export main
+func main() {
+	// Initialize main clock.
+	wch.RCC.CTLR.Set(wch.RCC_CTLR_HSION | wch.RCC_CTLR_PLLON)
+	wch.RCC.CFGR0.Set(0<<wch.RCC_CFGR0_HPRE_Pos | 0<<wch.RCC_CFGR0_PLLSRC_Pos)
+	wch.FLASH.ACTLR.Set(1 << wch.FLASH_ACTLR_LATENCY_Pos)
+	wch.RCC.INTR.Set(0x009F0000)
+	for (wch.RCC.CTLR.Get() & wch.RCC_CTLR_PLLRDY) == 0 {
+	}
+	wch.RCC.SetCFGR0_SW(0b10)
+	for (wch.RCC.CFGR0.Get() & wch.RCC_CFGR0_SWS_Msk) != 0x08 {
+	}
+
+	// Enable all GPIO pins (port A, C and D).
+	wch.RCC.APB2PCENR.SetBits(wch.RCC_APB2PCENR_IOPAEN | wch.RCC_APB2PCENR_IOPDEN | wch.RCC_APB2PCENR_IOPCEN)
+
+	run()
+	exit(0)
+}
+
+type timeUnit int64
+
+var currentTicks timeUnit
+
+func putchar(c byte) {
+	// TODO
+}
+
+func exit(code int) {
+	abort()
+}
+
+func ticks() timeUnit {
+	return currentTicks
+}
+
+// ticksToNanoseconds converts RTC ticks (at 32768Hz) to nanoseconds.
+func ticksToNanoseconds(ticks timeUnit) int64 {
+	// The following calculation is actually the following, but with both sides
+	// reduced to reduce the risk of overflow:
+	//     ticks * 1e9 / 32768
+	return int64(ticks) * 1953125 / 64
+}
+
+// nanosecondsToTicks converts nanoseconds to RTC ticks (running at 32768Hz).
+func nanosecondsToTicks(ns int64) timeUnit {
+	// The following calculation is actually the following, but with both sides
+	// reduced to reduce the risk of overflow:
+	//     ns * 32768 / 1e9
+	return timeUnit(ns * 64 / 1953125)
+}
+
+var dummyVolatile volatile.Register32
+
+func sleepTicks(ticks timeUnit) {
+	// TODO: use a timer (using the low-speed clock)
+	loops := ticks * 70
+	for i := timeUnit(0); i < loops; i++ {
+		dummyVolatile.Get()
+	}
+}
+
+func abort() {
+	for {
+	}
+}

targets/ch32v003.json

@@ -0,0 +1,17 @@
+{
+	"inherits": ["riscv32"],
+	"target-abi": "ilp32e",
+	"features": "+32bit,+c,+e,-a,-d,-experimental-zacas,-experimental-zcmop,-experimental-zfbfmin,-experimental-zicfilp,-experimental-zicfiss,-experimental-zimop,-experimental-ztso,-experimental-zvfbfmin,-experimental-zvfbfwma,-f,-h,-i,-m,-relax,-smaia,-smepmp,-ssaia,-svinval,-svnapot,-svpbmt,-v,-xcvalu,-xcvbi,-xcvbitmanip,-xcvelw,-xcvmac,-xcvmem,-xcvsimd,-xsfvcp,-xsfvfnrclipxfqf,-xsfvfwmaccqqq,-xsfvqmaccdod,-xsfvqmaccqoq,-xtheadba,-xtheadbb,-xtheadbs,-xtheadcmo,-xtheadcondmov,-xtheadfmemidx,-xtheadmac,-xtheadmemidx,-xtheadmempair,-xtheadsync,-xtheadvdot,-xventanacondops,-za128rs,-za64rs,-zawrs,-zba,-zbb,-zbc,-zbkb,-zbkc,-zbkx,-zbs,-zca,-zcb,-zcd,-zce,-zcf,-zcmp,-zcmt,-zdinx,-zfa,-zfh,-zfhmin,-zfinx,-zhinx,-zhinxmin,-zic64b,-zicbom,-zicbop,-zicboz,-ziccamoa,-ziccif,-zicclsm,-ziccrse,-zicntr,-zicond,-zicsr,-zifencei,-zihintntl,-zihintpause,-zihpm,-zk,-zkn,-zknd,-zkne,-zknh,-zkr,-zks,-zksed,-zksh,-zkt,-zmmul,-zvbb,-zvbc,-zve32f,-zve32x,-zve64d,-zve64f,-zve64x,-zvfh,-zvfhmin,-zvkb,-zvkg,-zvkn,-zvknc,-zvkned,-zvkng,-zvknha,-zvknhb,-zvks,-zvksc,-zvksed,-zvksg,-zvksh,-zvkt,-zvl1024b,-zvl128b,-zvl16384b,-zvl2048b,-zvl256b,-zvl32768b,-zvl32b,-zvl4096b,-zvl512b,-zvl64b,-zvl65536b,-zvl8192b",
+	"build-tags": ["ch32v003", "ch32v00xxx", "wch"],
+	"scheduler": "none",
+	"gc": "leaking",
+	"rtlib": "compiler-rt",
+	"libc": "picolibc",
+	"cflags": [
+		"-march=rv32ec"
+	],
+	"linkerscript": "targets/ch32v003.ld",
+	"extra-files": [
+	],
+	"flash-command": "probe-rs download --chip=CH32V003 {elf}"
+}

targets/ch32v003.ld

@@ -0,0 +1,9 @@
+MEMORY
+{
+    FLASH_TEXT (rw) : ORIGIN = 0x00000000, LENGTH = 16K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 2K
+}
+
+_stack_size = 1K;
+
+INCLUDE "targets/riscv.ld"

targets/nanoch32v003.json

@@ -0,0 +1,4 @@
+{
+    "inherits": ["ch32v003"],
+    "build-tags": ["nanoch32v003"]
+}