def read_fan_voltage(ser, lock):
"""Reads the current voltage of each fan.
Returns:
- If success: a list with voltage data for each fan
- If failure to read data: An empty list
"""
# List to hold fan voltage data to be returned
fans = []
with lock:
for fan in [0x01, 0x02, 0x03, 0x04, 0x05, 0x06]:
try:
# Define bytes to be sent to the Grid for reading voltage for a specific fan
# Format is two bytes, e.g. [0x84, <fan id>]
serial_data = [0x84, fan]
ser.reset_output_buffer()
bytes_written = ser.write(serial.to_bytes(serial_data))
# Wait before checking response
time.sleep(WAIT_GRID)
# Expected response is 5 bytes
# Example response: 00 00 00 0B 01 = 0x0B 0x01 = 11.01 volt
response = ser.read(size=5)
# Check if the Grid responded with any data
if response:
# Check for correct response (first three bytes should be 0x00)
if response[0] == int("0xC0", 16) and response[1] == response[2] == int("0x00", 16):
# Convert last two bytes to a decimal float value
voltage = float(str(response[3]) + "." + str(response[4]))
# Add the voltage for the current fan to the list
fans.append(voltage)
# An incorrect response was received
else:
print("Error reading fan voltage, incorrect response")
return []
# In case no response (0 bytes) is returned from the Grid
else:
print("Error reading fan voltage, no data returned")
return []
except Exception as e:
helper.show_error("Could not read fan voltage.\n\n"
"Please check serial port " + ser.port + ".\n\n"
"Exception:\n" + str(e) + "\n\n"
"The application will now exit.")
print(str(e))
sys.exit(0)
return fans
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