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DLPNIRNANOEVM: Problems interpreting/using NNO_CMD commands

Part Number: DLPNIRNANOEVM

I am preparing a python interface code for DLP NIRscan Nano EVM through USB.

So far, it is going moderate, except for a few confusions here and there.  I am reading reference code and user guide while doing it.

Currently, I can connect, start scan, adjust a few parameters (do not need all), retrieve scan data correctly and graph it.

However, I've encountered a couple of problems that give me trouble. They are related to some NNO_CMD_... commands. Here is my usual scan workflow (as suggested by the user guide dlpu030g.pdf);

1- Send NNO_CMD_SCAN_SET_ACT_CFG

2- Send NNO_CMD_SCAN_SCAN_NUM_REPEATS (and read response although I do not need the response)

3- Send NNO_CMD_SCAN_READ_SCAN_TIME and read the response

4- Send NNO_CMD_SCAN_PERFORM_SCAN (with no storage to SSD option)

5- Send NNO_CMD_READ_DEVICE_STATUS to see if the scan is completed.

6- If the scan is completed, send NNO_CMD_FILE_GET_READSIZE

7- Using the file size obtained in step-6, repeatedly send NNO_CMD_FILE_GET_DATA to retrieve entire scan-data.

First problem is on NNO_CMD_SCAN_NUM_REPEATS command. Unless a response is requested (bit-6) and the response is read (although it is actually useless), device does not conform to requested scan repeats and goes on with the configuration set previously by NNO_CMD_SCAN_SET_ACT_CFG command. Why is it so? Why am I forced to request response with NNO_CMD_SCAN_NUM_REPEATS command?

The second problem is on NNO_CMD_READ_DEVICE_STATUS command. I use this command to see if the scan is completed. Command seems to work correctly. However, as soon as I get bit-1 zero on the returned 4 byte response (meaning that the scan is completed), I am no longer be able to retrieve the scan-data. It seems that this command (with completion of scan) clears the scan-data. If I do not send this command and instead wait for the lamp to turn off, I can retrieve the scan-data correctly. Interesting thing is that when NNO_CMD_READ_DEVICE_STATUS command returns "scan is not completed yet" I am able to read the scan-data after waiting for a few seconds.

Can anybody help me with these problems?

(I also have problem with hibernation commands but somewhat avoided them by asking time to EVM every 4 minutes Slight smile )

  • Erol,

    Welcome to the E2E forums and thanks for your interest in our DLP technology.

    Are you referencing against the nirScan Nano Spectrum Library for your code? I recommend following the order of operations for such commands as implemented in the Spectrum Library.

    You may also be able to read implementation comments for further advice.

    Regards,

    Philippe