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michal23
michal23
Visitor II
April 2, 2015
Question

STemWin and external RAM

Posted on April 02, 2015 at 14:37

I have linked STemWin library. My project uses external RAM.

When I display some progressbar using internal RAM, value of progress is displayed correctlly (ex. 50%). When I am switching buffer ''aMemory'' to extrernal RAM (static U32 aMemory[GUI_NUMBYTES / 4] __attribute__ ((section(''.extram''))) the value of progress is displayed strange, ex. 00 instead off 50%, 33 instead of 13%, each times the second digit is shown twice, first digit and ''%'' char aren't displayed.

Where is the problem ?

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    1 reply

    development
    development
    Associate II
    August 21, 2017
    Posted on August 21, 2017 at 09:32

     Dear szymura ,

    Do you got any solution for this problem. Because i am facing the same problem for GUI.

    I am using the sdram .and declared same as you have done.

    My GUI is not working (lcd flickers) for progress bar etc.

    If changed the 

    aMemory to internal ram the it is working fine . But I want more memory So I am using external sdram.

    if I check aMemory seperately then it is working ok

    uwWriteReadStatus=0;

    for (uwIndex = 0; uwIndex < (GUI_NUMBYTES / 4); uwIndex++)

    {

    aMemory1[uwIndex] = uwIndex;

    }

    /* Read back data from the SDRAM memory */

    for (uwIndex = 0; uwIndex < (GUI_NUMBYTES / 4); uwIndex++)

    {

    // if (0x87654321 != *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex))

    if (uwIndex != aMemory1[uwIndex])

    {

    uwWriteReadStatus++;

    }

    }

    I am getting 

    uwWriteReadStatus as 0;That means it working.

    Regards,

    Somnath

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