Implemented new module Flashers to flash firmware and certificates

Author: silvanocerza

flasher/flasher.go

@@ -0,0 +1,86 @@
+/*
+  FirmwareUploader
+  Copyright (c) 2021 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+package flasher
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/arduino/go-paths-helper"
+	"go.bug.st/serial"
+)
+
+type CommandData struct {
+	Command byte
+	Address uint32
+	Value   uint32
+	Payload []byte
+}
+
+type FlasherError struct {
+	err string
+}
+
+func (e FlasherError) Error() string {
+	return e.err
+}
+
+type Flasher interface {
+	FlashFirmware(firmwareFile *paths.Path) error
+	FlashCertificates(certificatePaths *paths.PathList) error
+	Close() error
+
+	hello() error
+	write(address uint32, buffer []byte) error
+	flashChunk(offset int, buffer []byte) error
+	getMaximumPayloadSize() (uint16, error)
+	serialFillBuffer(buffer []byte) error
+	sendCommand(data CommandData) error
+}
+
+// http://www.ni.com/product-documentation/54548/en/
+// Standard baud rates supported by most serial ports
+var baudRates = []int{
+	115200,
+	57600,
+	56000,
+	38400,
+}
+
+func openSerial(portAddress string) (serial.Port, error) {
+	var lastError error
+
+	for _, baudRate := range baudRates {
+		port, err := serial.Open(portAddress, &serial.Mode{BaudRate: baudRate})
+		if err != nil {
+			lastError = err
+			// Try another baudrate
+			continue
+		}
+
+		if err := port.SetReadTimeout(30 * time.Second); err != nil {
+			return nil, fmt.Errorf("Could not set timeout on serial port: %s", err)
+		}
+
+		return port, nil
+	}
+
+	return nil, lastError
+}