We are using ADV7280AWBCPZ-M, MIPI-CSI output IC, with our custom NXP IMXRT1176 microcontroller board. We could not yet success to see colorful test bars pattern on display. Let me summarize what we did up to now;
1- I sent your script ":Color Bars 576p MIPI Out:" to adv7280m, 576P (Progressive Mode, I2P enabled) Mipi output test pattern script named "ADV7280M_Cust-VER.4.1.txt" in attached. Before running the script, I am making hard reset and waits as in the following;
resource->pullPowerDownPin(false);
resource->pullResetPin(false);
ADV7280M_DelayMs(100);
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resource->pullPowerDownPin(true);
ADV7280M_DelayMs(20);
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resource->pullResetPin(true);
ADV7280M_DelayMs(50);
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2- I tried to capture some data over I2C according to the reference:https://ez.analog.com/docs/DOC-10695 in order to be sure that our crystal works oscillating well. I repeated 8-10 times successive test reads but in each time I got "0xAF" data from the "0x46 address Interrupt Map Register". So, the most significant bit is always read as "1" , because of that it seems crystal not oscillating properly. But not got any idea why crystal not oscillate well.
3- I captured some oscilloscope screenshots of MIPI_CSI-CLKP,CLKN and MIPI_CSI-DP0,DN0 (in attached, yellow signals represent positive and blue signals represent negative csi-clock and data). Mipi Clk is around 90MHz I captured however since I2P core is enabled, it has to be around 216MHz.(According to the datasheet if interlaced it is 216Mbps, otherwise it is 432Mbps for progressive scan).
However, as based on the reference(https://www.analog.com/media/en/technical-documentation/application-notes/an-1337.pdf) , our NXP IMXRT1176 receiver side switches HS to LP or ULPS states very well. Receiver D_PHY termination seems good. (Please see the oscilloscope shots in attachments. However again seems that signal timing is wrong, I think, but not sure.)
4- We are using 4 pads XTAL input named "ABM8G-28.63636MHZ-18-D2Y-T". I also attached the crystal oscilloscope captured screenshots with DC biased in oscilloscope. When I run the script, adv7280-M applies some DC voltage to crystal. However, I am not sure if it is oscillating correctly. I thought that I would see roughly 28MHz signal however I would not. I also attached the other XTAL which feeding the imxrt1176. I can very easily capture this crystal in oscilloscope as 24MHz. But 28.6363MHz crystal is not. By the way, we designed hardware connection for XTAL to the same with ADV7280 datasheet. Actually, we performed everything according to the circuit in the last pages of datasheet. So, 47pf capacitor to each leg of crystal and the remaining 2 legs unused pins connected to the ground.
5- I saw that in EVAL BOARD as based on the reference https://www.analog.com/media/en/technical-documentation/evaluation-documentation/adv7280am_32ebz-sch_a.pdf, there is 560R resistance in series with XTALP pin of ADV7280AM(Our design was made as based on ADV7280M datasheet, but both is the same as far I observe). Since I have no 20pf capacitor, I added to the nearest capacitor so I added 18pf to each leg together with 560R to XTALP. However nothing changed even it got much worse.
6- I prepared camera framebuffer as CAMFB[576][720] and cameraConfig.frameBufferLinePitch_Bytes = DEMO_CAMERA_WIDTH * APP_BPP (720 *2 bytes) and csiConfig.workMode = kCSI_CCIR656ProgressiveMode. It is 2 bytes because U-Y-V-Y (Cb0-Y0-Cr0-Y1-Cb2-Y2-Cr2-Y3 and so on...) 16 bits per pixel. So that 2 bytes.. What I am not sure that IMXRT1176 if aware of or knows about ITU-R:BT656 messaging protocol. However I am thinking with the setting the choice of kCSI_CCIR656ProgressiveMode, imxrt1176 can decode the messaging protocol.(Data ID, blanking data, EAV, SAV etc. Is it required to define some more room in framebuffer for these datas (except from payload data) as well? or making room as CAMFB[576][720] is enough for just obtaining 1 frame? )
7- I can run :Color Bars 576p MIPI Out: in "ADV7280M_Cust-VER.4.1.txt" and success to observe datas on CSI_DP0-DN0 in oscilloscope. However when I try to run :Color Bars 576i MIPI Out:, I could not see any data on CSI data outputs. Is not it abnormal? Neither :Color Bars 576i MIPI Out: nor :Color Bars 480i MIPI Out: test pattern works!!
8- This is the our current case as in the link ADV7280-M crystal doesn't work？if crystal doesn't work，can free run mode work normally? . We are trying the 4 pads XTAL to 2 pins solder pad in PCB. Also I tried to XTALN pin to GPO1 pin to see crystal oscillation as in the link How to get Crystal Clock output on GPIO pin of ADV728x . But could not see any signal.
Is it possible to share any oscilloscope screenshot regarding XTAL input clock signal feeding adv7280m and mipi-csi-clkp,clkn as well as mipi-csi-data in any one of your properly running EVAL BOARD?
We are got stuck. I am waiting your urgent recommendations/ideas if you can. Many thanks
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[edited by: kartal at 12:10 PM (GMT -5) on 27 Jan 2023]
