Method and device for bidirectional communication
The present invention is directed to a method for bidirectional communication between a command unit and a plurality of LED control units connected thereto. In accordance with the invention, it is possible to supply control commands to LED control units with high speed, or to return execution results from these control units to a command unit. Therefore, the present invention provides for a highly efficient and thus highly performant method for communication between several serially connected control units. Furthermore, the invention is directed to a respective device for bidirectional communication as well as a computer program product including control commands for implementation of the method.
1. A method for bidirectional communication between a command unit and a serially and electrically connected plurality of LED control units, the method comprising:
transmitting a control command as an instruction for all LED control units from the command unit to the first serially connected LED control unit;
executing the transmitted control command in the LED control unit that has received the control command and immediate passing-on of the unchanged control command to the next connected LED control unit which did not transmit the control command, iteratively in such a way that each LED control unit receives and executes the same control command and the passing-on of the control command is carried out immediately after its reception before execution or at the same time as its execution in an LED control unit, wherein the passing-on is carried out in LED control units unless the LED control unit has only one communication partner and an order is defined in the series in such a way that the transmission of the control command from the command unit to the last LED control unit is carried out by means of the single LED control units; and
respectively returning an execution result of the control command, starting from the last serially connected LED control unit to the respective previous unit, wherein each of the plurality of LED control units attaches its execution result to the received execution result in an iterative way such that the command unit receives the execution results of each LED control unit.
2. The method according to claim 1 , wherein the execution result comprises at least one return value of a plurality of return values, the plurality comprising: a measurement value, a calculation result and a status information.
3. The method according to claim 1 , wherein the control command includes several instructions.
4. The method according to claim 1 , wherein the LED control units are connected serially in pairs by means of a respective data line segment of a data line.
5. The method according to claim 1 , wherein the data line segments are unidirectional and adjustable in regard to their direction of communication.
6. The method according to claim 1 , wherein the adjustment of the direction of communication is carried out depending on the received control command.
7. The method according to claim 4 , wherein the direction of communication describes if one of the paired LED control units executes a reading operation or a writing operation on the data line segment.
8. The method according to claim 1 , wherein each of the LED control units inverts the direction of communication of the respective data line segment after the receipt of the transmitted control command on its own.
9. The method according to claim 1 , wherein each of the LED control units inverts the direction of communication of the respective data line segment after the return of the execution result on its own.
10. A memory module comprising control commands for executing a method according to claim 1 .
11. A device for bidirectional communication between a command unit and a plurality of serially and electrically connected LED control units, comprising:
the command unit which is configured for transmission of a control command as an instruction for all LED control units to the first serially connected LED control unit; and
the plurality of LED control units, each being configured for execution of the transmitted control command in the respective LED control unit that has received the control command and for immediate passing-on of the unchanged control command to the next connected LED control unit which has not yet transmitted the control command, in an iterative manner, such that each LED control unit receives and executes the same control command and the passing-on of the control command is carried out immediately after its reception before execution or at the same time as its execution in an LED control unit, wherein the passing-on is carried out in LED control units unless the LED control unit has only one communication partner and an order is defined in the series in such a way that the transmission of the control command from the command unit to the last LED control unit is carried out by means of the single LED control units wherein the plurality of LED control units is configured for return of a respective execution result of the control command, starting from the last of the serially connected LED control units to the respective previous unit, wherein each of the plurality of LED control units attaches its execution result to the respective received execution result, in an iterative manner, such that the command unit receives the execution results of each of the control units.