Part Number: DLP4500
We are trying to get a video stream of Raspberry PI 4 desktop to DLP's micromirror via hdmi.
Somehow, GUI shows that everything is OK and there's no problem with video signal capturing, but there's still an issue of no video/picture displaying on the DLP's mirror.
Also, horizontal resolution and vertical resolution are detected with a slight addition in pixels, GUI shows that resolution is 802x601, but HDMI model is configured to be 800x600 60fps mode broadcast, and there is no trouble with displaying Raspberry's desktop, when it's connected to other devices. We also tried different kinds of DLP's supported resolution, but the trouble is constant.
I attach screenshots to be more clear with my problem. We are new to this and it's a struggle for us to solve this kind of trouble.
Any help will be highly appreciated, thank you!
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In reply to Vivek Thakur:
Thank you! I will be waiting for your answer.
Hi Alexander, Can you please confirm that the raspberry pi output includes blanking intervals more than specified on the DLPC350 Datasheet section 6.11 Video Timing Input Blanking Specification?
Also, could you please try connecting the LCR4500 EVM to another source (such as HDMI out from laptop/ PC) and see if you can get image on the wall?Thanks & Regards,
Thanks & Regards,Hirak.
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In reply to Hirak Biswas:
Yes, I was configuring custom hdmi model on rasperry referring to DLPC350 Datasheet section 6.11. I think that i can attach model parameters with desription.
hdmi_timings=800 1 20 20 68 600 1 4 20 388 0 0 0 60 0 28800000 3, where
1 <h_active_pixels> = 800 (width)2 <h_sync_polarity> = 13 <h_front_porch> = 204 <h_sync_pulse> = 205 <h_back_porch> = 68 6 <v_active_lines> = 6007 <v_sync_polarity> = 18 <v_front_porch> = 49 <v_sync_pulse> = 20 10 <v_back_porch> = 388 11 <v_sync_offset_a> = leave at zero12 <v_sync_offset_b> = leave at zero13 <pixel_rep> = leave at zero14 <frame_rate> = 6015 <interlaced> = leave at zero16 <pixel_freq> = 28800000 (width*height*framerate)17 <aspect_ratio> = 3 (16:9)
Actually, we have a custom electronic board and I assume we may have some problems with EDID EEPROM, because it's empty, and we may need a EEPROM firmware file for DLP, because it's hard to configure.
In reply to Alexander Dobroslavin:
Thanks for sharing your Raspberry Pi configuration. Do you have the full config.txt file?
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In reply to Philippe Dollo:
For sure, i can share my Raspberry config file in attachments.
To add, I got this config tested by Raspberry Pi support engineer, he answered that it works correctly (but he got it tested on the HDMI capture card).
Hi Alexander, Can you please try with another source such as your laptop/PC? That will confirm once & for all if there is something wrong with your EVM. Also, did you modify the TI FW Image (adding custom Images, I2C Settings, Config INI etc) in any way before flashing it on to the device?
Yes, I've already tried to connect DLP to another source - and the streaming was successful. Also, I did try to add custom images but nothing was displayed
could you kindly note the blanking information while connected to the device with successful streaming and apply them to your RPi module to see if that works?
Also, while modifying official FW kindly note the following:
DLPC350 FW v4.0 and below should be modified ONLY by LCR4500 GUI v3.1.0 and
DLPC350 FW v4.1 should be modified ONLY by LCR4500 GUI v4.0.0
mixing incompatible GUI and FW may generate corrupted FW.
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