Frame class 'NoneType'

[EmmanuelLC]

Hello,

I am trying to get a frame from the EVB90640. It seems that the connection with the device is working (can get the port and id: b'\x01\xe9\x03 \x00\x01Melexis\x01EVB90640\x01V 2.0\x01D87 256EAFC \x01’). However, when using the read_frame function, no frame is returned.

You’ll find my code below. Thanks in advance for your help.

import mlx.mlx90640 as mlx
import cv2
import numpy as np
import serial.tools.list_ports
ports = serial.tools.list_ports.comports()

for port, desc, hwid in sorted(ports):
print("{}: {} [{}]".format(port, desc, hwid))
print(port)
print('------------------------------------------------------------------------------------')

dev = mlx.Mlx9064x('/dev/tty.usbmodem21101', i2c_addr=0x33, frame_rate=8.0) # establish communication between EVB90640 and
# PC, the I2C address of the MLX90640 sensor is
# 0x33 and change the frame rate to 8Hz
print(type(dev))

dev.init() # read EEPROM and pre-compute calibration parameters.
print(dev.get_hardware_id())

try:
frame = dev.read_frame()
print('frame_rate : ', dev.frame_rate)
print(type(frame))
print(np.size(frame))
print(np.shape(frame))
print(frame)
except:
dev.clear_error(dev.frame_rate)
print("error")
else:
if frame is not None:
print('Got a frame')