from hackrf import *

def open_hackrf(num):
	# Opens the desired number of HackRFs

	hackrf = [None] * int(num)						#Declare empty list
	for i in range(int(num)):
		print()
		try:
			hackrf[i] =  HackRF(device_index = i)
		except Exception as e:
			print(e)
			print(f"Error opening device: {i}")
			hackrf = hackrf[:-1]					# Decrease list size
		else:
			print(f"device {i} opened")
			print(hackrf[i].get_serial_no())
	return(hackrf)	#return list of opened HackRFs