floe/cec

Arduino library for HDMI CEC communication

Hello there 👋

cec's Issues

Cannot send CEC command to TV

Dear Floe,

I have questions regarding your sample code.

Here is the setting of my testing environment,

1. I built the simple circuit following your suggestion in CEC_Electrical.png
2. I connected simple circuit with Arduino UNO board. As what you suggested, Pin-2 on Arduino uno board as IN_LINE, while Pin-3 as OUT_LINE. I didn’t connect anything on HPD_LINE.
3. Since I don’t use Keyboard, I commented all Keyboard related codes.
4. I connected CEC pin to Pin-13 of HDMI connector. Connect GND and +5V from Arduino Uno board to HDMI connector(Pin 17 and Pin 18). Connect HDMI cable between HDMI connector and sony-BRAVIA TV. CEC feature is enabled on sony TV, by the way.
5. I built your sample code and uploaded to Arduino board.
6. When I turned off TV, I got the following message,

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standby
Packet received at 17468: 00 -> 15: 0F:A0:08:00:46:00:09:00:01

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7. When I turn on TV, I got the following message,

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Packet received at 12810: 00 -> 15: 0F:A0:08:00:46:00:04:00:01
Packet received at 13103: 00 -> 15: 0F:A0:08:00:46:00:08:00:00
Packet received at 13924: 00 -> 15: 0F:80:00:00:20:00

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8. after then, I repeatedly got the following message,

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report PhysAddr
Transmit failed, max retries reached.
Transmit: 0

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9. When I tried ‘v’ to run “request vendor ID” cmd, I got the following error message,

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Transmit failed, max retries reached.
Transmit: 0

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10. I tried other CEC cmds with same error result.
    It seems that the code is able to receive the CEC msg, but is not able to send proper cmd. I checked the signal on the oscilloscope. The signal was sent out when I run “v” cmd. It seems that the circuit self has no problem.

Do you have any idea on the error while I sent the CEC cmd to TV?

Thanks

Mike

Question rather than issue

Hello,
just a question, rather than an issue.

Does the TV notify its status on the CEC bus?
Can i see if it left standby?

Thanks.

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