#!/usr/bin/python3

import time
import serial

def reset():
	ser.dtr = True
	ser.rts = False
	time.sleep(0.05)
	ser.dtr = True
	ser.rts = True

def enter_bootloader():
	ser.dtr = True
	ser.rts = False
	time.sleep(0.05)
	ser.dtr = False
	ser.rts = True

if __name__ == '__main__':

	ser = serial.Serial ('/dev/ttyUSB0', 9600)

	try:
		ser.open()
	except:
		ser.close()
		ser.open()

	if 0:
		time.sleep(1.0)
		print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
		time.sleep(0.5)

		ser.rts = False
		print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
		time.sleep(0.5)

		ser.dtr = False
		print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
		time.sleep(1.0)

	print("Start firmware update")
	enter_bootloader()
	ser.timeout = 0.100
	ser.readline()

	ser.flushInput()
	with open("HendiCtrl.srec", 'r') as fp:
		while(True):
			s = fp.readline()
			if s == '':
				break
			data = s.encode()
#			print(data)
			ser.write(data)
#			print(ser.read())

	time.sleep(1.0)
	ser.flushInput()

	print("Start application")
	reset()
	print(ser.readline().decode('utf-8'))

	ser.close()

	print ("End of program.")