Splicing lamp, detection executing method, and detection driving method

A splicing lamp, comprising a controller and at least one lamp module, wherein:

• the at least one lamp module is in communication connection with the controller through a communication link;
• and
• the lamp module comprises a control chip and multiple light-emitting units controlled by the control chip, wherein the control chip is configured to serve as a current control chip and to perform:
• configuring all ports of the current control chip to be in a strong pull-down mode, and initiating detection procedures including:
• detecting a level status of each port of the current control chip, and when detecting a port with a high level status, identifying the port with the high level status as an upstream port electrically connected with an upstream control chip in the communication link, and configuring other ports of all ports of the current control chip except the upstream port to be in a weak pull-up mode;
• detecting the level status of each of the other ports, and when detecting a port with a low level status, identifying the port with the low level status as a downstream port electrically connected with a downstream control chip in the communication link;
• outputting a high level through the downstream port, for driving the downstream control chip connected with the downstream port to execute the detection procedures.