topic Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80 in Kinetis Microcontrollers

Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

pravin_patil — Fri, 17 Aug 2018 07:31:05 GMT

I am using color TFT display with resolution 480x272 and color data is 565 RGB ie. 16 bits per pixel. i want to use FLEXIO to drive the LCD and 8 bit data out SDRAM for graphics frame buffer because i have issue with pin count for 16 bit SDRAM.

Can i use 8 bit SDRAM insted of 16 bit for graphics frame buffer ??

Thanks

Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

Hui_Ma — Mon, 20 Aug 2018 09:02:24 GMT

Hi,

The AN5280(Using Kinetis FlexIO to drive a graphical LCD) chapter 5 shows FlexIO_LCD bus bandwidth performance.

If there couldn't using 16-bit data port to access SDRAM, the FlexIO_LCD maximum bus bandwidth from SDRAM should below 31MBytes/s.

I don't know the LCD display pixel clock frequency (MHz), you could check with LCD display datasheet to get that data.

Please calculate if the FlexIO_LCD bus bandwidth could match with that LCD display requirement.

Wish it helps.

Have a great day,
Mike

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Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

divyaece2 — Mon, 20 Aug 2018 13:38:30 GMT

Hi..

I have the same issue as Parvin Patil mentioned but the difference is that internal SDRAM. Now I am working on IMX RT-1050 for updating graphics frame buffer (480 x 272). I am a beginner with that.. Please, give me the example for accessing the sdram of imxrt 1050. It would be helpful for me...

Thanks and Regards,

Divya.S

Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

Hui_Ma — Tue, 21 Aug 2018 02:23:02 GMT

Hi,

I checked the MCUXpresso SDK software package for i.MX RT1050 with SDRAM initialization code at <evkbimxrt1050_sdram_init.mac> file, which will be called during SDRAM target project debugger process.

I attached that file for your reference.

Wish it helps.

Have a great day,
Mike

Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

divyaece2 — Thu, 23 Aug 2018 07:02:34 GMT

Thank you Hui_Ma...

Thank you so much for support.. But I can't find your attachment file. And where can I find the factory settings in mcuxpresso IDE.. Please send your response as soon as possible...

Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

Hui_Ma — Thu, 23 Aug 2018 08:15:37 GMT

Hi,

I think you need to change another browser software (such as IE or Firefox) to check the attachment.

Please check here about Overview i.MXRT1050 with MCUXpresso IDE.

Wish it helps.

Have a great day,
Mike

Re: Can i use 8 bit data out external SDRAM for updating graphics framebuffer (480x272, 16 bits color data) in kinetis K80

divyaece2 — Fri, 24 Aug 2018 06:19:09 GMT

Hi Hui_Ma..

Thanks a lot.. Got your attachment! Will go through the same..