topic LCD flickering issue in LPC Microcontrollers

LCD flickering issue

lpcware — Wed, 15 Jun 2016 18:23:40 GMT

Content originally posted in LPCWare by Noufal on Mon Sep 21 11:44:22 MST 2015
Hi, I'm new to LPC controllers, Currently working on a 7" TFT display (480 * 800) interface with LPC1850 on Keil MDK, I'm seeing flickering issue on my display (I think slow refresh rate on display resulting the flicker ). Image is clear. I modified the qvga driver and updated the lcd parameters. Currently I have bypassed the pixel clock divider in POL register. I'm suspecting the clock, Need to know how to update LCD Dot Clock Frequency in 18xx.

Currently my BASE_LCD_CLK is IDIVE which around 5.6Mhz. My display dot clock is 30Mhz. If i want to update the dot clock to 30Mhz do i have update the IDIVE ? If yes how to update Idive

Re: LCD flickering issue

lpcware — Wed, 15 Jun 2016 18:23:41 GMT

Content originally posted in LPCWare by Noufal on Tue Sep 22 06:23:44 MST 2015
I was able to update to update the IDIVE to 30MHz by updating the IDIVE_IDIV and that fixed the issue, Still not sure BASE_LCD_CLK drive the dot clock

Re: LCD flickering issue

lpcware — Wed, 15 Jun 2016 18:23:42 GMT

Content originally posted in LPCWare by mc on Thu Sep 24 10:39:00 MST 2015
Hi Noufal,
Dot clock can be derived from either from external clock coming from LCDCLKIN(GP_CLKIN in UM) pin or from BASE_LCD_CLK. In your case you are using BASE_LCD_CLK. You can set divider according to your requirement of vertical sync frequency.