Remote control command code forwarding method for television set receiver
A technology of a television receiver and a forwarding method, which is applied to TVs, color TVs, components of color TVs, etc., can solve problems such as infrared remote control signal reception that affects the running of the main program, unstable remote control command forwarding waveform timing, etc., and is easy to transplant. , the effect of reducing the running time
Inactive Publication Date: 2010-09-29
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology
1. In the external interrupt service subroutine, the remote control forwarding command code is realized. Since the external interrupt is the highest interrupt level, no operation is used to delay the time. This ensures the timing of outputting the remote control command forwarding waveform, but it greatly affects The operation of the main program and the reception of infrared remote control signals
Second, the remote control command code forwarding is implemented in the main loop program. Due to the interference of external interrupts and timing interrupts, the timing of the remote control command forwarding waveform is extremely unstable, resulting in receiving problems for other modules.
Method used
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[0031] This example uses the NEC remote control coding method. According to the NEC remote control code specification, the boot header is 9ms low + 4.5ms high; the data code is 4 bytes and 32 bits, which is system code + system inverse code + data code + data inverse code, and the "1" code is 0.5625ms low +1.6875ms high, "0" code is 0.5625ms low plus 0.5625ms high; continuous code is 2.25msd low; the total length of each remote control code is 108ms, and the end code is the total code length minus the leading code minus the data code time.
[0032] Such as figure 1 Shown is the workflow of the main program, which needs to initialize MCU timers and I / O ports. After receiving the key, judge whether the key command needs to be forwarded, if necessary, directly call the forwarding command control function according to the forwarding command code mapping table; if not, then execute the key command. For example, according to the NEC remote control coding method, the reference tim...
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The invention relates to a method for forwarding remote control orders and provides a method for forwarding remote control order codes based on timed interruption. The method sets a timer of MCU as a basic time interval or a frequency multiple of the remote control codes, and changes the time interval of the output from an I / O port through the counterchange of different state machines to ensure the output of the remote control codes and the time sequence for outputting remote control order forwarding waveforms. Because in the major program cycle, all that is needed is to set the correspondingcontrol of sending and each step of sending is completed automatically through timed interruption. The method greatly reduces the runtime of the interference major cycle, and facilitates transplant among different hardware systems.
Description
technical field [0001] The invention relates to a main MCU in a remote-control television receiver to control other Legalist additional function modules, in particular to a method for realizing remote-control command forwarding. technical background [0002] In TV receivers, there are many new functions such as streaming media player, electronic photo frame, built-in DVD, built-in digital TV receiver and so on. Generally speaking, the TV receiver needs to be used as the main control MCU to control the MCU of the corresponding functional modules. However, the resources of the main control MCU are limited, and the control method is realized by remote control command forwarding. The way to realize the forwarding of the remote control command is generally carried out in the external interrupt service subroutine or in the main loop program. 1. In the external interrupt service subroutine, the remote control forwarding command code is realized. Since the external interrupt is th...
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IPC IPC(8): H04N5/44
Inventor 向何谢绿峰
Owner SICHUAN CHANGHONG ELECTRIC CO LTD