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How to read flash in C - c8051F020

Luciano Gabbanelli

Hi, the problem is that the compiler uses MOVX instead of MOVC when I'm reading the rom, of course it doesn't work. There's no problem to write the flash. I don't want to add an assembly routine.
Is there any other solution?
I'm using Silabs C8051F020.

Thanks.

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  • 0 in reply to ²erik malund

    You're right, but first I need to write a string in rom, and then read one character at a time.
    If I declare "char code string[5]", as instance, I can't write in it, even if I use a xdata pointer.
    So I did this:

    unsigned char xdata vector[10];
    unsigned char code *pflashread;

    unsigned char xdata *pflashwrite;

    pflashread = 0xbbbb;

    pflashwrite = pflashread;

    write_flash(pflashwrite,vector);

    var_2 = pflashread[0]; //here I read directly

    Don't think I haven't try a few things before this.

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  • 0 in reply to ²erik malund

    You're right, but first I need to write a string in rom, and then read one character at a time.
    If I declare "char code string[5]", as instance, I can't write in it, even if I use a xdata pointer.
    So I did this:

    unsigned char xdata vector[10];
    unsigned char code *pflashread;

    unsigned char xdata *pflashwrite;

    pflashread = 0xbbbb;

    pflashwrite = pflashread;

    write_flash(pflashwrite,vector);

    var_2 = pflashread[0]; //here I read directly

    Don't think I haven't try a few things before this.

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