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Problem with Read memory RA8875

Topic last updated 04 Sep 2016, by David Smart. 1 reply
GURA SERGEY
08 Sep 2015

Hi all! I have a device that I develop, set in the TFT controller RA8875. All functions and commands work fine. But! I can not read from the memory. I do so:

short GetPixel (short x, short y) {      short RGB;

  • Adr_TFT_Command = 0x40; Graph mode
          
    • Adr_TFT_Data = 0;

     *Adr_TFT_Command = 0x4a;      *Adr_TFT_Data = x;      *Adr_TFT_Command = 0x4b;      *Adr_TFT_Data = x >> 8;

     *Adr_TFT_Command = 0x4c;      *Adr_TFT_Data = y;      *Adr_TFT_Command = 0x4d;      *Adr_TFT_Data = y >> 8;

     *Adr_TFT_Command = 0x02;      RGB = * Adr_TFT_Data; Dummy read      RGB = * Adr_TFT_Data; return (RGB); }

The function always returns 0! What am i doing wrong? Help me please!

David Smart
04 Sep 2016

This is an old, but unanswered question. I don't have a direct answer for your question, however my RA8875 library supports reading the image. You might compare your code to what is in there to find the issue.