def set_fan(ser, fan, voltage, lock):
"""Sets voltage of a specific fan.
Note:
The Grid only supports voltages between 4.0V and 12.0V in 0.5V steps (e.g. 4.0, 7.5. 12.0)
Configuring "0V" stops a fan.
"""
# Valid voltages and corresponding data (two bytes)
speed_data = {0: [0x00, 0x00], # 0% (Values below 4V is not supported by the Grid, fans will be stopped)
4.0: [0x04, 0x00], # 33.3% (4.0V)
4.5: [0x04, 0x50], # 37.5% (4.5V)
5.0: [0x05, 0x00], # 41.7% (5V)
5.5: [0x05, 0x50], # 45.8% (5.5V)
6.0: [0x06, 0x00], # 50.0% (6V)
6.5: [0x06, 0x50], # 54.2% (6.5V)
7.0: [0x07, 0x00], # 58.3% (7V)
7.5: [0x07, 0x50], # 62.5% (7.5V)
8.0: [0x08, 0x00], # 66.7% (8V)
8.5: [0x08, 0x50], # 70.1% (8.5V)
9.0: [0x09, 0x00], # 75.0% (9.0V)
9.5: [0x09, 0x50], # 79.2% (9.5V)
10.0: [0x0A, 0x00], # 83.3% (10.0V)
10.5: [0x0A, 0x50], # 87.5% (10.5V)
11.0: [0x0B, 0x00], # 91.7% (11.0V)
11.5: [0x0B, 0x50], # 95.8% (11.5V)
12.0: [0x0C, 0x00]} # 100.0% (12.0V)
fan_data = {1: 0x01, # Fan 1
2: 0x02, # Fan 2
3: 0x03, # Fan 3
4: 0x04, # Fan 4
5: 0x05, # Fan 5
6: 0x06} # Fan 6
# Define bytes to be sent to the Grid for configuring a specific fan's voltage
# Format is seven bytes:
# 44 <fan id> C0 00 00 <voltage integer> <voltage decimal>
#
# Example configuring "7.5V" for fan "1":
# 44 01 C0 00 00 07 50
serial_data = [0x44, fan_data[fan], 0xC0, 0x00, 0x00, speed_data[voltage][0], speed_data[voltage][1]]
try:
with lock:
bytes_written = ser.write(serial.to_bytes(serial_data))
time.sleep(WAIT_GRID)
# TODO: Check reponse
# Expected response is one byte
response = ser.read(size=1)
print("Fan " + str(fan) + " updated")
except Exception as e:
helper.show_error("Could not set speed for fan " + str(fan) + ".\n\n"
"Please check settings for serial port " + str(ser.port) + ".\n\n"
"Exception:\n" + str(e) + "\n\n"
"The application will now exit.")
sys.exit(0)
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