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DLP9000: LED Enable Control: the Sequencer does not fully controls the LED outputs

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Replies: 3

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Part Number: DLP9000

As advised in the related question, I made use of the bit 3 in the LED Enable Outputs Command (0x1A07) to resolve the problem with the LEDs being on when DMD Idle Mode is enabled. In fact, the issue with the DMD Idle mode was resolved, but a new problem appeared.

I run a small test:

1. On power up, the default pattern is displayed in the pre-stored pattern mode. The system status is as follows:

2. Then I stop pattern sequence. As expected, the pattern is no longer displayed. I only see the 'dark' lite (LEDs are ON, Sequencer is stopped). The system status is as follows:

3. Then I send the command LED Enable Outputs Command (0x1A07) with the data byte '00001000' (disable LED outputs, let the Sequencer control the the LED outputs). As expected, no dark light is displayed, since the LEDs got OFF. The system status:

4. Then I start the sequencer, expecting that the LED outputs to be ON and the default pattern to be on. However, even dark light is not present (the LEDs are still OFF, even though the sequencer is running). Here is the status:

The latter was a kind of unexpected behavior. Could you please comment on it.

Best,

Roman

  • Hello Roman,

    I will have to explore this one.  I do not know without stepping through the procedure to make sure that there is not something that we are missing.

    Fizix

  • In reply to Fizix:

    Hello Fizix,

    Please find below the log file from the trial I described earlier (each of four steps I split in separate log blocks):

    ID_00002_Log_file_191009162110_f125_b2.log

    As you can see, after enabling sequencer control over the LED outputs, the query of LED outputs returns data byte: 8 (00001000): "sequencer control is enabled, LEDs are OFF".

    After starting the sequencer, the LED outputs query returns the same data byte: 8 (00001000): "sequencer control is enabled, LEDs are OFF".

    I hope this helps.

    Regards,

    Roman

  • In reply to Fizix:

    Well, I figured out how to overcome the issue (whether it's an intended behavior or not is another question). 

    When executing LED Enable Outputs Command (0x1A07) with the data byte '00001000' (disable LED outputs, let the Sequencer control the the LED outputs), the LEDs will be always OFF, does not matter is the sequencer is running or not.

    When executing LED Enable Outputs Command (0x1A07) with the data byte '00001111' (enable LED outputs, let the Sequencer control the the LED outputs), the LEDs will be ON when the sequencer is running, and OFF otherwise.

    So this issue is resolved for me.