Auto detection and adaptive configuration of HDMI ports
Methods, systems, circuits, devices, and apparatuses are described for auto-detection and adaptive configuration of high-definition multimedia interface (HDMI) ports. Unique systems and circuits allow HDMI repeaters to automatically detect if an HDMI device that has been connected thereto, via an HDMI port, is an HDMI source (source mode) or an HDMI sink (sink mode). The unique systems and circuits may be adaptively configured to allow the HDMI port to function as an HDMI input or an HDMI output based on the automatic detection. Methods corresponding to the functions performed by the systems and apparatuses are provided, and computer readable storage media with computer program instructions encoded thereon for enabling processing devices to perform the methods are also provided.
1. A system comprising:
a high-definition multimedia interface (HDMI) mode detection circuit that comprises:
a first detection switch comprising a first terminal electrically coupled to a first pin of an HDMI port and a second terminal;
a first mode detection node electrically coupled to the second terminal;
a second mode detection node electrically coupled to a second pin of the HDMI port;
switch control logic;
a voltage regulator; and
a second detection switch;
the switch control logic configured to provide a first control signal and a second control signal;
the first detection switch configured to:
receive a first HDMI signal from the HDMI port via the first pin;
receive the first control signal;
activate in response to receiving the first control signal and connect the first pin to the first mode detection node;
provide an indication of a first HDMI mode at the first mode detection node based at least in part on the first HDMI signal; and
deactivate subsequent to providing the indication and disconnect the second terminal from the first mode detection node;
the second mode detection node configured to:
receive a second HDMI signal from the HDMI port via the second pin; and
provide an indication of a second HDMI mode based on a first voltage value at the second pin;
the voltage regulator configured to provide an output voltage at an output terminal; and
the second detection switch comprising a third terminal electrically coupled to the first pin of the HDMI port, and a fourth terminal electrically coupled via a resistive component to the output terminal, the second detection switch configured to:
receive the second control signal; and
activate in response to receiving the second control signal and when the first detection switch is not activated to provide the first voltage value at the first pin.
2. The system of claim 1 , wherein the first HDMI mode is an HDMI source mode, and
wherein the second HDMI mode is an HDMI sink mode.
3. The system of claim 2 , wherein the first mode detection node and the second mode detection node are electrically coupled to a controller of an HDMI switch configured to adaptively control one or more switching circuits of the HDMI switch.
4. The system of claim 3 , wherein the indication of the first HDMI mode at the first mode detection node prompts the controller of the HDMI switch to configure the HDMI port as an input port; and
wherein the indication of the second HDMI mode at the second mode detection node prompts the controller of the HDMI switch to configure the HDMI port as an output port.
5. The system of claim 1 , wherein the first HDMI signal comprises a signal on a five volt connection line; and
wherein the second HDMI signal comprises a signal on a hot-plug detection connection line.
6. The system of claim 1 , further comprising:
a third detection switch comprising a fifth terminal electrically coupled to the first pin of the HDMI port, and a sixth terminal electrically coupled to the output terminal, the third detection switch configured to:
receive a third control signal from the switch control logic;
activate in response to receiving the third control signal to provide a second voltage value at the first pin; and
provide protection against a short-circuit condition between the first detection switch and the second detection switch when activated.
7. The system of claim 1 , wherein the HDMI mode detection circuit further comprises a five volt output configured to provide a 5V voltage source to one or more HDMI sink connections.
8. The system claim 1 , further comprising at least one additional HDMI mode detection circuit associated respectively with at least one additional HDMI port.
9. A method in a high-definition multimedia interface (HDMI) mode detection circuit that comprises a first detection switch comprising a first terminal electrically coupled to a first pin of an HDMI port and a second terminal, a first mode detection node electrically coupled to the second terminal, a second mode detection node electrically coupled to a second pin of the HDMI port, switch control logic, a voltage regulator, and a second detection switch comprising a third terminal electrically coupled to the first pin of the HDMI port and a fourth terminal electrically coupled via a resistive component to an output terminal, the method comprising; receiving a first HDMI signal from the HDMI port via the first pin at the first detection switch; providing a first control signal by the switch control logic; receiving the first control signal at the first detection switch; activating the first detection switch in response to receiving the first control signal and connecting the first pin to the first mode detection node; providing an indication of a first HDMI mode at the first mode detection node by the first detection switch based at least in part on the first HDMI signal; deactivating the first detection switch subsequent to providing the indication and disconnecting the second terminal from the first mode detection node; receiving a second HDMI signal from the HDMI port via the second pin at the second mode detection node; providing a second control signal by the switch control logic; providing an output voltage at the output terminal by the voltage regulator; receiving the second control signal at the second detection switch; activating the second detection switch in response to receiving the second control signal and when the first detection switch is not activated to provide a first voltage value at the first pin; and providing an indication of a second HDMI mode by the second mode detection node based on the first voltage value at the second pin.
10. The method of claim 9 , wherein the first HDMI mode is an HDMI source mode, and
wherein the second HDMI mode is an HDMI sink mode.
11. The method of claim 10 , wherein the first mode detection node and the second mode detection node are electrically coupled to a controller of an HDMI switch, the method further comprising:
adaptively controlling one or more switching circuits of the HDMI switch by the controller.
12. The method of claim 11 , further comprising:
prompting the controller of the HDMI switch to configure the HDMI port as an input port based on the indication of the first HDMI mode at the first mode detection node; or
prompting the controller of the HDMI switch to configure the HDMI port as an output port based on the indication of the second HDMI mode at the second mode detection node.
13. The method of claim 9 , wherein the first HDMI signal comprises a signal on a five volt connection line; and
wherein the second HDMI signal comprises a signal on a hot-plug detection connection line.
14. The method of claim 9 , wherein the HDMI mode detection circuit comprises a third detection switch comprising a fifth terminal electrically coupled to the first pin of the HDMI port and a sixth terminal electrically coupled to the output terminal, the method further comprising:
receiving a third control signal from the switch control logic at the third detection switch;
activating the third detection switch in response to receiving the third control signal to provide a second voltage value at the first pin; and
providing protection against a short-circuit condition between the first detection switch and the second detection switch when the third detection switch activated.
15. The method of claim 9 , wherein the HDMI mode detection circuit further comprises a five volt output configured, the method further comprising:
providing a 5V voltage source to one or more HDMI sink connections by the five volt output.