STR711 global variables don't work

Development Boards MicroMod
1

Hi,

I have a problem with global variables in one of my first ARM7 projects.

I declared a variable upside main()

u16 test;

but the output to my UART-terminal-program of the following c-code is 0x62000908:0

  test = 42;
  sprintf(buffer,"%p:%i",&test,test);
  UART_StringSend(UART0, buffer);

Is there a problem with the ram-address? Where could I find the reason for this error? If I declare test inside main() it works!

I have uploaded the Project on my Server: [Download

It’s a sample-code is from [here](Loading...)](http://munske.de/Temp/STR711-UART.rar)

2

Your linker script puts the variable into bank 1 external memory.

Does this bank exist and is it enabled?

3

I have no external memory installed in hardware.

Where do I have to change the linker script to make it work? Could you please post the lines that I should change?

4

In file STR71x-ROM.ld change >XDATA to >DATA for section .data and .bss.

That’s in line 131 and 147.

5

Thank you very much!

For beginners it’s very difficult to find the solution for those problems because an ARM7 is much more complex than an avr for example - it seems to take long time to get exposed with this Mikrocontroller, but the sparkfun-community is a big help for me!