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Rev. C: Fix wake-up mechanism in case old asleep device is still detected #873

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Merged
merged 1 commit into from
Oct 14, 2025
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Rev. C: Fix wake-up mechanism in case old asleep device is still detected #873

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27 changes: 15 additions & 12 deletions library/lcd/lcd_comm_rev_c.py
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,9 @@ class SubRevision(Enum):
REV_8INCH = "chs_88inch"


WAKE_RETRIES = 15


# This class is for Turing Smart Screen 2.1" / 5" / 8" screens
class LcdCommRevC(LcdComm):
def __init__(self, com_port: str = "AUTO", display_width: int = 480, display_height: int = 800,
Expand All @@ -132,22 +135,18 @@ def __del__(self):

@staticmethod
def auto_detect_com_port() -> Optional[str]:
com_ports = comports()

# First, try to find sleeping device and wake it up
for com_port in com_ports:
# If sleeping device is detected through serial number or vid/pid, try to wake it up
for com_port in comports():
if com_port.serial_number == 'USB7INCH' or com_port.serial_number == 'CT21INCH':
LcdCommRevC._wake_up_device(com_port)
return LcdCommRevC.auto_detect_com_port()
if com_port.vid == 0x1a86 and com_port.pid == 0xca21:
elif com_port.vid == 0x1a86 and com_port.pid == 0xca21:
LcdCommRevC._wake_up_device(com_port)
return LcdCommRevC.auto_detect_com_port()

return LcdCommRevC._get_awake_com_port(com_ports)
return LcdCommRevC._get_awake_com_port(comports())

@staticmethod
def _get_awake_com_port(com_ports) -> Optional[str]:
# Then try to find awake device through serial number or vid/pid
# Try to find awake device through serial number or vid/pid
for com_port in com_ports:
if com_port.serial_number == '20080411':
return com_port.device
Expand All @@ -160,10 +159,10 @@ def _get_awake_com_port(com_ports) -> Optional[str]:

@staticmethod
def _wake_up_device(com_port):
# this device enumerates differently when off, we need to connect once to reset it to correct COM device
# Connect to the device to wake it up
logger.debug(f"Waiting for device {com_port} to be turned ON...")

for i in range(15):
for i in range(WAKE_RETRIES):
try:
# Try to connect every second, since it takes sometimes multiple connect to wake up the device
serial.Serial(com_port.device, 115200, timeout=1, rtscts=True)
Expand All @@ -172,9 +171,13 @@ def _wake_up_device(com_port):

if LcdCommRevC._get_awake_com_port(comports()) is not None:
time.sleep(1)
logger.debug(f"Detected screen turned ON")
return

time.sleep(1)

logger.error(f"Could not turn screen on after {WAKE_RETRIES} seconds, aborting.")

def _send_command(self, cmd: Command, payload: Optional[bytearray] = None, padding: Optional[Padding] = None,
bypass_queue: bool = False, readsize: Optional[int] = None):
message = bytearray()
Expand Down Expand Up @@ -431,7 +434,7 @@ def _generate_update_image(
img_data, pixel_size = image_to_BGRA(image)
else:
# BGRA mode on 3 bytes: [6-bit B + 2-bit A, 6-bit G + 2-bit A, 8-bit R]
#img_data, pixel_size = image_to_compressed_BGRA(image)
# img_data, pixel_size = image_to_compressed_BGRA(image)
# For now use simple BGR that is more optimized, because this program does not support transparent background
img_data, pixel_size = image_to_BGR(image)

Expand Down