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Forum Index : Microcontroller and PC projects : Color problem - ILI9481 driver for MM2
| Author | Message | ||||
| erbp Senior Member  Joined: 03/05/2016 Location: AustraliaPosts: 195 |
Hopefully this is something Matherp can comment on. I have one of the 4" 320 x 480 IPS ILI9481 screens on an E28 Micromite using the loadable driver for MM2 provided by Peter in this thread. I am getting weird results with the colors being displayed on the screen, sometimes the color displayed is nothing like what it should have been - e.g. bright green instead of a light tan! I only have one of these screens so can't try another to see if maybe the screen is defective, but it does seem to do everything else correctly. I have created a small test program that displays samples of various colors (which illustrates the problem) and I have run this program on a 7" SSD1963 connected to an E64 and the colors displayed are as I expected them to be - see example screen images below for comparison. Below is the ILI9481 screen image:  And the next one is for the 7" SSD1963 screen:  Some of the colors change a bit from what they looked like on the screens to the naked eye, but not so much that tan turns to green or copper turns to black (4th row across, top image) Below is the code for the program producing these images - maybe if someone else has one of these screens working they could try the program and advise if they get the same results as I did or if the result is more like the second image above (i.e. correct). CLS RGB(Black) Box 4, 6, 72, 72, 0, 0, RGB(63,0,0) Text 40, 78, "(63,0,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 84, 6, 72, 72, 0, 0, RGB(127,0,0) Text 120, 78, "(127,0,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 164, 6, 72, 72, 0, 0, RGB(191,0,0) Text 200, 78, "(191,0,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 244, 6, 72, 72, 0, 0, RGB(255,0,0) Text 280, 78, "(255,0,0)", "CT", 1, 1, RGB(WHite), RGB(Black) Box 4, 102, 72, 72, 0, 0, RGB(0,63,0) Text 40, 174, "(0,63,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 84, 102, 72, 72, 0, 0, RGB(0,127,0) Text 120, 174, "(0,127,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 164, 102, 72, 72, 0, 0, RGB(0,191,0) Text 200, 174, "(0,191,0)", "CT", 1, 1, RGB(White), RGB(Black) Box 244, 102, 72, 72, 0, 0, RGB(0,255,0) Text 280, 174, "(0,255,0)", "CT", 1, 1, RGB(WHite), RGB(Black) Box 4, 198, 72, 72, 0, 0, RGB(0,0,63) Text 40, 270, "(0,0,63)", "CT", 1, 1, RGB(White), RGB(Black) Box 84, 198, 72, 72, 0, 0, RGB(0,0,127) Text 120, 270, "(0,0,127)", "CT", 1, 1, RGB(White), RGB(Black) Box 164, 198, 72, 72, 0, 0, RGB(0,0,191) Text 200, 270, "(0,0,191)", "CT", 1, 1, RGB(White), RGB(Black) Box 244, 198, 72, 72, 0, 0, RGB(0,0,255) Text 280, 270, "(0,0,255)", "CT", 1, 1, RGB(WHite), RGB(Black) Box 44, 294, 72, 72, 0, 0, RGB(184,115,51) Text 80, 366, "(184,115,51)", "CT", 1, 1, RGB(White), RGB(Black) Box 204, 294, 72, 72, 0, 0, RGB(138,51,36) Text 240, 366, "(138,51,36)", "CT", 1, 1, RGB(White), RGB(Black) Box 4, 390, 72, 72, 0, 0, RGB(255,0,0) Text 40, 426, "255,0,0", "CM", 1, 1, RGB(Black), RGB(255,0,0) Box 84, 390, 72, 72, 0, 0, RGB(0,255,0) Text 120, 426, "0,255,0", "CM", 1, 1, RGB(Black), RGB(0,255,0) Box 164, 390, 72, 72, 0, 0, RGB(0,0,255) Text 200, 426, "0,0,255", "CM", 1, 1, RGB(Black), RGB(0,0,255) Also notice in the righthand row of the first image, there is text overlaying the 3 color boxes. The text is specified with the same color as the box was filled with, yet it displays as a different shade to the background of the box. This is more noticeable with the Blue in the image, but in reality the Green one was particularly noticeable (that seems to have got lost somewhere in the photo taking / transferring process). In the second image there is no discernible difference between the box background and the text background, as it should be. At present I'm not sure if it is just my screen  or whether there is a problem with the MM2 version of the driver.  Phil. |
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 10565 |
Hi Phil It is working for me but it is sensitive to wiring as the SPI is running very fast (I'm testing on a MM2 HAT stand) . You can try setting the CPU speed to 20 to see if that changes things. Also the attached version has an optional speed setting parameter ILI9481 CDpin, RESETpin, CHIPSELECTpin, orientation, speed The speed parameter changes the SPI clock divider. Without the parameter the SPI bus runs at the CPU speed / 2 Setting a value changes the SPI speed as follows "SPI speed=CPU speed / 2 /(speed+1)" CSub ILI9481 00000275 'spi_write_data 27BDFFE0 AFBF001C AFB10018 AFB00014 309100FF 3C109D00 8E030090 8E02001C 8064002C 0040F809 24050006 8E030090 8E02001C 8064002D 0040F809 24050005 3C02BF80 AC515820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C425820 3C029D00 8C430090 8C42001C 8064002D 0040F809 24050006 8FBF001C 8FB10018 8FB00014 03E00008 27BD0020 'spi_write_command 27BDFFE0 AFBF001C AFB10018 AFB00014 309100FF 3C109D00 8E030090 8E02001C 8064002C 0040F809 24050005 8E030090 8E02001C 8064002D 0040F809 24050005 3C02BF80 AC515820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C425820 3C029D00 8C430090 8C42001C 8064002D 0040F809 24050006 8FBF001C 8FB10018 8FB00014 03E00008 27BD0020 'spi_write_cd 27BDFFD8 AFBF0024 AFB10020 AFB0001C AFA60030 AFA70034 00A08821 27A20030 AFA20010 308400FF 0411FFD2 00000000 1A20000A 00008021 8FA20010 24430004 AFA30010 90440000 0411FFA7 00000000 26100001 1611FFF9 8FA20010 8FBF0024 8FB10020 8FB0001C 03E00008 27BD0028 'DefineRegion 27BDFFD8 AFBF0024 AFB40020 AFB3001C AFB20018 AFB10014 AFB00010 00808821 00A09821 00C09021 00E0A021 3C109D00 8E030090 8E02001C 8064002C 0040F809 24050005 8E030090 8E02001C 8064002D 0040F809 24050005 2403002A 3C02BF80 AC435820 3C03BF80 8C625810 30420080 1040FFFD 3C10BF80 8E025820 3C029D00 8C430090 8C42001C 8064002C 0040F809 24050006 00111203 AE025820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 AC515820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 00121A03 AC435820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 AC525820 3C03BF80 8C625810 30420080 1040FFFD 3C10BF80 8E025820 3C029D00 8C430090 8C42001C 8064002C 0040F809 24050005 2402002B AE025820 3C03BF80 8C625810 30420080 1040FFFD 3C10BF80 8E025820 3C029D00 8C430090 8C42001C 8064002C 0040F809 24050006 00131203 AE025820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 AC535820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 00141A03 AC435820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C435820 AC545820 3C03BF80 8C625810 30420080 1040FFFD 3C10BF80 8E025820 3C029D00 8C430090 8C42001C 8064002C 0040F809 24050005 2402002C AE025820 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C425820 3C029D00 8C430090 8C42001C 8064002D 0040F809 24050006 8FBF0024 8FB40020 8FB3001C 8FB20018 8FB10014 8FB00010 03E00008 27BD0028 'DrawBitmapSPI 27BDFFB8 AFBF0044 AFBE0040 AFB7003C AFB60038 AFB50034 AFB40030 AFB3002C AFB20028 AFB10024 AFB00020 0080A821 00A0B821 00C09021 00E0B021 8FBE0058 8FA6005C 8FA30060 8FB30064 28A50000 00001021 02E5100A 00402821 3C02BF80 8C475830 AFA70010 8C475800 AFA70014 8C475840 AFA70018 AC405800 3C149D00 8E870090 80E7003C AC475830 3C070001 34E78520 AC475800 24070C00 AC475840 7CD01340 00061403 2407FFF8 00471024 02028025 321000FF 00108200 7CC820C0 00063143 2402FFE0 00C23024 01063025 30C600FF 02068025 7C711340 00033403 00C73824 02278825 323100FF 00118A00 7C6620C0 00031943 00621024 00C21025 304200FF 02228825 2486FFFF 24A7FFFF 73D21002 00463021 73D61002 00473821 0411FF26 00000000 8E830090 8E82001C 8064002C 0040F809 24050006 8E830090 8E82001C 8064002D 0040F809 24050005 0012C823 72D27802 25EFFFFF 0240C021 00005821 0000A021 03C06821 3C069D00 240C0001 10000043 3C03BF80 26F70001 26E2FFFF 0440003A 00000000 8CC20098 8C420000 0057102B 1440005C 8FBF0044 1E400023 01E04821 10000031 00000000 24420001 2444FFFF 04800016 00000000 8CC40094 8C840000 0082202B 14800011 00000000 91040000 00872024 10800008 00000000 8C645810 30840002 1480FFFD 00000000 AC705820 10000006 00000000 8C645810 30840002 1480FFFD 00000000 AC715820 5445FFE7 24420001 254A0001 15520005 2529FFFF 10000011 00000000 02A01021 00005021 014B2021 24850007 28880000 00A8200B 000440C3 02684021 000927C3 00042742 01243821 30E70007 00E43823 00EC3804 1000FFD1 004D2821 56EEFFC3 26F70001 26940001 01F97821 01785821 0296102A 10400005 3C02BF80 1FC0FFBA 02FE7021 1000FFF8 26940001 8C435810 30630080 1060FFFD 00000000 10000002 3C02BF80 8C435820 8C435810 30630020 1060FFFC 3C10BF80 24020040 AE025814 3C029D00 8C430090 8C42001C 8064002D 0040F809 24050006 AE005800 8FA20010 AE025830 8FA70014 AE075800 8FA20018 AE025840 8FBF0044 8FBE0040 8FB7003C 8FB60038 8FB50034 8FB40030 8FB3002C 8FB20028 8FB10024 8FB00020 03E00008 27BD0048 'DrawRectangleSPI 27BDFFC8 AFBF0034 AFBE0030 AFB7002C AFB60028 AFB50024 AFB40020 AFB3001C AFB20018 AFB10014 AFB00010 8FA30048 3C02BF80 8C565830 8C575800 8C5E5840 AC405800 3C089D00 8D080090 8108003C AC485830 3C080001 35088520 AC485800 24080C00 AC485840 0086102A 14400005 00A7102A 00801021 00C02021 00403021 00A7102A 14400004 28920000 00A01021 00E02821 00403821 0012200B 00809021 3C029D00 8C420094 8C420000 0082402B 2444FFFF 0088900A 28D30000 0013300B 00C09821 00C2202B 2442FFFF 0044980A 28B40000 0014280B 00A0A021 3C029D00 8C420098 8C420000 00A2282B 2444FFFF 0085A00A 28F50000 0015380B 00E0A821 00E2202B 2442FFFF 0044A80A 7C701340 00032403 2402FFF8 00821024 02028025 321000FF 00108200 7C6220C0 00031943 2404FFE0 00641824 00431025 304200FF 02028025 02402021 02802821 02603021 02A03821 0411FE4B 00000000 3C119D00 8E230090 8E22001C 8064002C 0040F809 24050006 8E230090 8E22001C 8064002D 0040F809 24050005 24020001 00529023 02539821 00542023 00952021 70932002 10800009 2484FFFF 3C03BF80 8C625810 30420002 1440FFFD 00000000 AC705820 1480FFFA 2484FFFF 3C03BF80 8C625810 30420080 1040FFFD 3C02BF80 8C425810 30420020 14400006 3C02BF80 8C435820 8C435810 30630020 1060FFFC 00000000 3C10BF80 24020040 AE025814 3C029D00 8C430090 8C42001C 8064002D 0040F809 24050006 AE005800 AE165830 AE175800 AE1E5840 8FBF0034 8FBE0030 8FB7002C 8FB60028 8FB50024 8FB40020 8FB3001C 8FB20018 8FB10014 8FB00010 03E00008 27BD0038 'getFPC 27BDFFF8 AFBF0004 00852023 03E42021 ACC40000 8FBF0004 03E00008 27BD0008 'pstring 27BDFFE0 AFBF001C AFB00018 00808021 00002021 3C059D00 24A509B0 27A60010 0411FFEF 00000000 8FA40010 3C029D00 8C42002C 0040F809 02042021 8FBF001C 8FB00018 03E00008 27BD0020 'main 27BDFF88 AFBF0074 AFB70070 AFB6006C AFB50068 AFB40064 AFB30060 AFB2005C AFB10058 AFB00054 00808821 00A08021 00C09021 00E09821 8FB40088 00002021 3C059D00 24A50A28 27A60048 0411FFD1 00000000 3C029D00 8C430090 8E040000 A064002E 8C430090 8E240000 A064002C 8C430090 8E440000 A064002D 8C420090 8E630000 12800006 A0430015 3C029D00 8C420090 8E830000 10000004 A043003C 3C029D00 8C420090 A040003C 3C109D00 8E030090 8E020010 8064002E 24050008 0040F809 00003021 8E030090 8E020010 8064002E 24050065 0040F809 00003021 8E030090 8E02001C 8064002E 0040F809 24050006 8E030090 8E020010 8064002C 24050008 0040F809 00003021 8E030090 8E020010 8064002C 24050065 0040F809 00003021 8E030090 8E02001C 8064002C 0040F809 24050006 8E030090 8E020010 8064002D 24050008 0040F809 00003021 8E030090 8E020010 8064002D 24050065 0040F809 00003021 8E030090 8E02001C 8064002D 0040F809 24050006 3C02BF81 8C44F220 7C84D800 3C020661 3442A053 1082000B 24030050 3C02BF81 8C43F220 7C63D800 3C020660 3442A053 00621826 24020050 2404000C 0083100B 00401821 3C029D00 8C420088 00621821 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| erbp Senior Member Joined: 03/05/2016 Location: AustraliaPosts: 195 |
@Matherp - Thanks, I found my problem. Your description about SPI speed vs CPU speed reminded me that I had the CPU set at 48MHz. This was done in the MM.Startup file and because it happens automatically every time the chip initialized, I had forgotten about it.  Dropping the CPU back to the default 40MHz causes the colors to display correctly.  One question about the modified version of the ILI9481 driver that you posted - would it be possible to modify the way the speed parameter works to "SPI speed = CPU speed / (2 + speed)". This would allow finer control over the SPI clock divider i.e. speed parameter = 0 or not specified gives CPU speed/2, speed parameter = 1 gives CPU speed/3, speed parameter = 2 gives CPU speed/4, speed parameter = 3 gives CPU speed/5, etc. (you probably wouldn't want to go past /5 anyway) Would this be viable? Regards, Phil. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10565 |
No sorry - this is a limitation of the PIC clock hardware |
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| erbp Senior Member Joined: 03/05/2016 Location: AustraliaPosts: 195 |
Somehow that is what I thought the answer might be. Still worth asking. Thanks anyway! |
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