This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

placing/accessing constants inside flash memory

Subject says it all. I want to place some tag into flash and than compare it with the data in my SRAM. I know that it is simple but it is hard to start. Please advise. Thanks.

Parents

0 John Linq over 13 years ago in reply to HansBernhard Broeker

I have an old version of this RTX_Blinky. I did some tests.

Modified Blinky.c =>

/*----------------------------------------------------------------------------
 *        Task 6 'lcd': LCD Control task
 *---------------------------------------------------------------------------*/
__task void lcd (void) {

  const unsigned char hello[] = "Hello";
  for (;;) {
    os_mut_wait(mut_GLCD, 0xffff);
    GLCD_SetBackColor(Blue);                           /* Set the Text Color */
    GLCD_SetTextColor(White);                          /* Set the Text Color */
    GLCD_DisplayString(0, 0, "  MCB1700 RL-ARM    ");
    GLCD_DisplayString(1, 0, "    RTX Blinky      ");
    GLCD_DisplayString(2, 0, "   http://www.keil.com     ");
    GLCD_DisplayString(2, 0, hello);
    os_mut_release(mut_GLCD);
    os_dly_wait (400);

    os_mut_wait(mut_GLCD, 0xffff);
    GLCD_SetBackColor(Blue);                           /* Set the Text Color */
    GLCD_SetTextColor(Red);                            /* Set the Text Color */
    GLCD_DisplayString(0, 0, "  MCB1700 RL-ARM    ");
    GLCD_DisplayString(1, 0, "    RTX Blinky      ");
    GLCD_DisplayString(2, 0, "   http://www.keil.com     ");
    os_mut_release(mut_GLCD);
    os_dly_wait (400);
  }
}

KEIL toolchain says:
-> Blinky.c(142): error: #167: argument of type "const unsigned char *" is incompatible with -> parameter of type "unsigned char *"

Modified Blinky.c, added a casting =>

__task void lcd (void) {

  const unsigned char hello[] = "Hello";
  for (;;) {
    os_mut_wait(mut_GLCD, 0xffff);
    GLCD_SetBackColor(Blue);                           /* Set the Text Color */
    GLCD_SetTextColor(White);                          /* Set the Text Color */
    GLCD_DisplayString(0, 0, "  MCB1700 RL-ARM    ");
    GLCD_DisplayString(1, 0, "    RTX Blinky      ");
    GLCD_DisplayString(2, 0, "   http://www.keil.com     ");
    GLCD_DisplayString(2, 0, (unsigned char *)hello);
    os_mut_release(mut_GLCD);
    os_dly_wait (400);

KEIL toolchain says:
-> ".\Obj\Blinky.axf" - 0 Error(s), 0 Warning(s).

--
I have learnt a lot from Per Westermark's articles. His articles are very detailed and well organized. I can understand that, some people just don't like/need so much details. But, to me, those are very valuable information. I would like to take this opportunity to thank Per Westermark again.

Reply