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Forum Index : Microcontroller and PC projects : ILI9341 MISO Pin
| Author | Message | ||||
| asknik2022 Regular Member  Joined: 26/03/2022 Location: United KingdomPosts: 92 |
I have been told in the past that not all ILI9341 displays have the MISO Pin connected properly and that you need this Pin to use BLIT Commands in MMBasic Is this true and if so how do I know which Displays actually have the MISO pin wired correctly. Is there some tst code to check etc or a list of recommended manufacturers etc |
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stanleyella Guru  Joined: 25/06/2022 Location: United KingdomPosts: 2122 |
some give spec. https://www.aliexpress.com/item/1005003943508410.html? if it has the touch chip then miso probably wired. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
AFAIK the ILI9341 is the one that works ok with everything. The ILI9488 is the one that has problems with MISO. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2122 |
I got four ili9341, different physical size but all 320x240 and miso is wired on all ie read screen pixel works. one board did not have the touch chip. the ili9488 needs the Schottky diode and resistor fix then works ok, screen read, touch, sd card. |
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| asknik2022 Regular Member Joined: 26/03/2022 Location: United KingdomPosts: 92 |
Is there a test program? |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
This will test MISO by reading a pixel from the LCD screen. Copy and paste the two lines to the console. 'A 2 line colour counter. > clear : option base 0 : dim string s(2)=(" blues"," greens"," reds") : dim integer a, b, c, d > for a=0to 2:b=0:for c=0to 255:d=c<<a*8:pixel 9,9,d:if d=pixel(9,9)then:inc b:endif:next:?b;s(a):next 64 blues 64 greens 64 reds > If MISO is working properly the output is:- ILI9488 64, 64, 64 ILI9341 32, 64, 32 PicoMiteVGA 2, 4, 2 OPTION LCDPANEL VIRTUAL_C 2, 4, 2 If you get those results Blit and Save Image will also be ok. In program form:- 'A display colour counter Clear : Option Base 0 Dim String S$(2) = (" Blues", " Greens", " Reds") Dim Integer a, b, c, d For a = 0 to 2 'cycle through blue , green and red b = 0 'initialize colour count For c = 0 to 255 'set the brightness d = c << (a * 8) 'make a 24bit colour Pixel 9, 9, d 'send it to a pixel If d = Pixel(9, 9) Then 'read that pixel back from the screen Inc b 'if the colour is the same as the one sent count it EndIf next Print b; S$(a) 'show counted colours next End More info here.https://www.thebackshed.com/forum/ViewTopic.php?TID=16834&P=10#223571 Edited 2024-07-13 12:06 by phil99 |
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