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jujoab
Joined: 05 Aug 2017
Posts: 41
Location: brazil
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| nokia lcd 1100. mirroring |
 Posted: Sun Oct 22, 2017 10:09 am |
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For cost reasons i decided to use 4 nokia 1100 lcds, very cheap on ebay.
They work all right on every aspect, except the horizontal mirroring.
As I need to install two of them upside down, I need to mirror the horizontal and vertical arrangement for these one's.
At lcd initialization time the mirroring yes/no is set up, and doing individual initialization, got following results:
Vertical mirroring IS OK, it changes by Lcd_Write(CMD,0xC0) or Lcd_Write(CMD,0xC8).
The horizontal mirroring is supposed to switch on/off using Lcd_Write(CMD,0xA0) or Lcd_Write(CMD,0xA1), but does not work.
The PCF8814 says that SET MX "CMD,0xA0" is a NOP command, MX is pad selected.
I was not able to find in the manual how to select it on the pad.
Google confirms that other people had the problem, but not showing any solution.
Any hint ?
juab |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Mon Oct 23, 2017 10:39 am |
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You should post a link to the Nokia display datasheet.
The fact some (all ?) are having the problem without a solution seems to suggest the command is wrong ?
Have you asked Nokia ?
Perhaps the 'very cheap on eBay' units are defective OR that command is NOT in their BIOS. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19497
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| Posted: Mon Oct 23, 2017 11:17 am |
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You are aware that the MX bit is not immediate.
The MY bit just swaps the display immediately.
The MX bit changes how data it then written to the display. So you have to clear the display, set the MX bit, then write the data, which is then displayed reversed. |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Mon Oct 23, 2017 5:51 pm |
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Found these 'somewhere' on the web...
| Code: |
Lcd_Write(CMD,0xA6^((cfg&0x02)>>1)); // Invert display option
//Lcd_Write(CMD,0xA0^(cfg&0x01)); // Mirror X axis option
Lcd_Write(CMD,0xC0^(cfg&0x08)); // Mirror Y axis option |
Maybe it will help ??
Naturally I have NO idea what 'cfg' is though I suppose it's in the datasheet.
Jay |
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jujoab
Joined: 05 Aug 2017
Posts: 41
Location: brazil
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| Posted: Wed Oct 25, 2017 7:21 pm |
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| temtronic wrote: | You should post a link to the Nokia display datasheet.
The fact some (all ?) are having the problem without a solution seems to suggest the command is wrong ?
Have you asked Nokia ?
Perhaps the 'very cheap on eBay' units are defective OR that command is NOT in their BIOS. |
as expected my note to Nokia was read but never answered.
part is an old one, from the time it was a different company
thanks |
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jujoab
Joined: 05 Aug 2017
Posts: 41
Location: brazil
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| Posted: Wed Oct 25, 2017 7:32 pm |
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| Ttelmah wrote: | You are aware that the MX bit is not immediate.
The MY bit just swaps the display immediately.
The MX bit changes how data it then written to the display. So you have to clear the display, set the MX bit, then write the data, which is then displayed reversed. |
Hi Ttelmah.
agree on the timing.
I am setting the MX and MY at the very beginning before any data is written on the lcd initialization , as per Fatih GENC driver (https://www.ccsinfo.com/forum/viewtopic.php?t=45358)
it goes as follows?
| Code: |
void Lcd_Init(void){
output_low(cs);
output_low(rst);
delay_ms(5); // 5mS so says the stop watch(less than 5ms will not work)
output_high(rst);
Lcd_Write(CMD,0x20); // write VOP register
Lcd_Write(CMD,0x90);
Lcd_Write(CMD,0xA4); // all on/normal display
Lcd_Write(CMD,0x2F); // Power control set(charge pump on/off)
Lcd_Write(CMD,0x40); // set start row address = 0
Lcd_Write(CMD,0xb0); // set Y-address = 0
Lcd_Write(CMD,0x10); // set X-address, upper 3 bits
Lcd_Write(CMD,0x0); // set X-address, lower 4 bits
//////////////////////////// mirror Y: /////////////////////////////////
Lcd_Write(CMD,0xC8); // mirror Y axis (about X axis)
//////////////////////////// mirror X; /////////////////////////////////
Lcd_Write(CMD,0xa1); // Invert screen in horizontal axis
Lcd_Write(CMD,0xac); // set initial row (R0) of the display
Lcd_Write(CMD,0x07);
//Lcd_Write(CMD,0xF9); //
Lcd_Write(CMD,0xaf); // display ON/OFF
Lcd_Clear(); // clear LCD
Lcd_Write(CMD,0xa7); // invert display
delay_ms(100);
Lcd_Write(CMD,0xa6); // normal display (non inverted)
delay_ms(100);
}
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thanks for your note
jujoab |
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jujoab
Joined: 05 Aug 2017
Posts: 41
Location: brazil
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| Posted: Wed Oct 25, 2017 8:00 pm |
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| temtronic wrote: | Found these 'somewhere' on the web...
| Code: |
Lcd_Write(CMD,0xA6^((cfg&0x02)>>1)); // Invert display option
//Lcd_Write(CMD,0xA0^(cfg&0x01)); // Mirror X axis option
Lcd_Write(CMD,0xC0^(cfg&0x08)); // Mirror Y axis option |
Maybe it will help ??
Naturally I have NO idea what 'cfg' is though I suppose it's in the datasheet.
Jay |
hi Jay
I failed to discover the note you mention. I also don't know what cfg stands for.
My understanding from the manual on commands to use ( AND WORKING OK):
Lcd_Write(CMD,0xC8); // mirror Y axis (about X axis)
Lcd_Write(CMD,0xC1); // DONT mirror Y axis
On the x axis I tried at LCD initialization following values:
Lcd_Write(CMD,0xC8);
OR
Lcd_Write(CMD,0xC1);
OR
Lcd_Write(CMD,0xC0);
OR
NOT ANY OF THEM
It doesn't make any difference for me.
Thanks for your note.
jujoab |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19497
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| Posted: Thu Oct 26, 2017 1:31 am |
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I note that in the data sheet, the 'reversal', is for the current row.
You change the row after setting the reversal. Try setting the row first. |
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jujoab
Joined: 05 Aug 2017
Posts: 41
Location: brazil
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| Posted: Thu Oct 26, 2017 6:53 am |
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| Ttelmah wrote: | I note that in the data sheet, the 'reversal', is for the current row.
You change the row after setting the reversal. Try setting the row first. |
Thanks Ttelmah.
I tried as follows, no changes on display results.
| Code: |
Lcd_Write(CMD,0x40); // set start row address = 0
Lcd_Write(CMD,0xb0); // set Y-address = 0
Lcd_Write(CMD,0x10); // set X-address, upper 3 bits
Lcd_Write(CMD,0x0); // set X-address, lower 4 bits
Lcd_Write(CMD,0xC8); // mirror Y axis (about X axis)
// Lcd_Write(CMD,0xa1); // Invert screen in horizontal axis
Lcd_Write(CMD,0xac); // set initial row (R0) of the display
Lcd_Write(CMD,0x07);
Lcd_Write(CMD,0xa1); // Invert screen in horizontal axis
//Lcd_Write(CMD,0xF9); //
Lcd_Write(CMD,0xaf); // display ON/OFF
Lcd_Clear(); // clear LCD
Lcd_Write(CMD,0xa7); // invert display
delay_ms(100);
Lcd_Write(CMD,0xa6); // normal display (non inverted)
delay_ms(100); |
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