topic iMX25 pixel clock calculation in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock-calculation/m-p/152015#M1329 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am trying to use an optrex 3.5" LCD with the foll spec:</P><P>refresh rate: 50<BR />x – resolution: 320<BR />y –resolution: 240<BR />pixel clock: 9.8MHz<BR />left_margin: Horizontal back porch: 68<BR />right_margin: Horizontal front porch: 20<BR />upper_margin: Vertical back porch: 2<BR />lower_margin: Vertical front porch: 2<BR />hsync_len: HSYNC width: 30<BR />vsync_len: VSYNC width: 11<BR />sync; (VERTICAL / HORIZONTAL SYNC HIGH ACTIVE): VERTICAL / HORIZONTAL SYNC Active Low<BR />vmode; (NON INTERLACED/ INTERLACED / ODD / DOUBLE): NON INTERLACED</P><P>The following changes were made to mxc_modedb.c:</P><P>"LCD_OPTREX", 50, 320, 240, 102040, 68, 20, 2, 2, 30, 11,<BR />/*FB_SYNC_OE_LOW_ACT,*/<BR />FB_SYNC_CLK_LAT_FALL,<BR />FB_VMODE_NONINTERLACED,<BR />0,},</P><P>where LCD_OPTREX would be the name i have assigned.</P><P><BR />Everything works fine (display, apps show up, TS), except that I don't get the splash screen (kernel boot logo)!</P><P>Is the pixelclock value wrong (i tried KHZ2PICO on 9.8MHZ)?</P><P></P><P></P><P>Venkat</P></BODY></HTML> Sat, 07 Apr 2012 05:44:36 GMT Venku 2012-04-07T05:44:36Z iMX25 pixel clock calculation https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock-calculation/m-p/152015#M1329 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am trying to use an optrex 3.5" LCD with the foll spec:</P><P>refresh rate: 50<BR />x – resolution: 320<BR />y –resolution: 240<BR />pixel clock: 9.8MHz<BR />left_margin: Horizontal back porch: 68<BR />right_margin: Horizontal front porch: 20<BR />upper_margin: Vertical back porch: 2<BR />lower_margin: Vertical front porch: 2<BR />hsync_len: HSYNC width: 30<BR />vsync_len: VSYNC width: 11<BR />sync; (VERTICAL / HORIZONTAL SYNC HIGH ACTIVE): VERTICAL / HORIZONTAL SYNC Active Low<BR />vmode; (NON INTERLACED/ INTERLACED / ODD / DOUBLE): NON INTERLACED</P><P>The following changes were made to mxc_modedb.c:</P><P>"LCD_OPTREX", 50, 320, 240, 102040, 68, 20, 2, 2, 30, 11,<BR />/*FB_SYNC_OE_LOW_ACT,*/<BR />FB_SYNC_CLK_LAT_FALL,<BR />FB_VMODE_NONINTERLACED,<BR />0,},</P><P>where LCD_OPTREX would be the name i have assigned.</P><P><BR />Everything works fine (display, apps show up, TS), except that I don't get the splash screen (kernel boot logo)!</P><P>Is the pixelclock value wrong (i tried KHZ2PICO on 9.8MHZ)?</P><P></P><P></P><P>Venkat</P></BODY></HTML> Sat, 07 Apr 2012 05:44:36 GMT https://community.nxp.com/t5/i-MX-Processors/iMX25-pixel-clock-calculation/m-p/152015#M1329 Venku 2012-04-07T05:44:36Z