Detecting an infrared transceiver type
View Patent ↗An infrared controller detects an infrared (IR) transceiver type by entering an IR transceiver detection mode and providing a command to another IR transceiver. The command is formatted in accordance with a first IR transceiver type. The IR controller determines whether a response to the command is received within a predetermined time period. When the response to the command is received within the predetermined time period, a first IR transceiver type is indicated. When the response to the command is not received within the predetermined time period, a second IR transceiver type is indicated.
1. A method for detecting an infrared (IR) transceiver type comprising:
entering an IR transceiver detection mode at an IR module of a data processing device; providing a command from the IR module to an IR transceiver, wherein the command is formatted in accordance with a first IR transceiver type; determining whether a response to the command is received within a predetermined time period based on the relationship between a count stored at a counter and the predetermined time period; when the response to the command is received within the predetermined time period, indicating the first IR transceiver type; and when the response to the command is not received within the predetermined time period, indicating a second IR transceiver type.
2. The method of claim 1 , wherein the command comprises a request to access one of a plurality of registers of the first IR transceiver type.
3. The method of claim 2 , further comprising the step of: monitoring a receive path from the IR transceiver for data corresponding to the request.
4. The method of claim 2 , wherein the request comprises one of a read request and a write request.
5. The method of claim 2 , wherein the request comprises one of a status check, a function execution, a transceiver ID detection, a capability detection, a serial interface initialization signal, and a bootup initialization sequence.
6. The method of claim 1 , wherein the predetermined time period comprises a range of one to four clock cycles.
7. The method of claim 1 , wherein the response to the command comprises a start bit that occurs no greater than four clock cycles after a last bit of the command.
8. The method of claim 1 , further comprising the step of: storing the indication
of the IR transceiver type.
9. The method of claim 1 , further comprising the step of: indicating the first IR
transceiver type as a serial interface device.
10. An infrared controller comprising:
first logic for entering an IR transceiver detection mode; an IR transmitter for providing a command to an IR transceiver;
an IR receiver for receiving a response to the command from another IR transceiver;
a counter;
second logic for: determining whether a response to the command is received within a predetermined time period, the second logic to receive a count from the counter and determine whether the response to the command is received within the predetermined time period based on a relationship between the count and the predetermined time period;
when the response to the command is received within the predetermined time period, indicating a first IR transceiver type of the another IR transceiver; and
when the response to the command is not received within the predetermined time period, indicating a second IR transceiver type of the another IR transceiver.
11. The infrared controller of claim 10 , further comprising: a register for
storing the first or second IR transceiver type.
12. The infrared controller of claim 10 , further comprising: third logic for
exiting an IR transceiver detection mode upon storing the IR transceiver type.
13. The infrared controller of claim 10 , wherein the register for storing the IR transceiver type comprises one of a non-volatile memory, flip flop logic, and a random access memory.
14. The infrared controller of claim 10 , wherein the second logic further functions to determine whether a response to the command is received within a predetermined time period by: receiving a predetermined time period parameter; comparing the count to the predetermined time period parameter: when the count is less than the predetermined time period, determining whether the response to the command has been received.
15. The infrared controller of claim 10 , wherein the first IR transceiver type comprises a serial interface device.
16. The infrared controller of claim 10 comprises:
the infrared controller including circuitry in a first integrated circuit package;
the IR transceiver including circuitry in a second integrated circuit package;
wherein the circuitry of the IR transceiver is coupled to the circuitry of the infrared controller.
17. The infrared controller of claim 10 , further comprising a store for storing the predetermined time period response for at least one transceiver type.