printing uint64_t

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#1

I'm testing three different boards and native mode RIOT. It seems I may have a problem with printing 64 bit ints (for example, an EUI-64 address). Here's the code fragment (modified from examples/hello-world.c):

    uint64_t longnum = 0x1234567812345678;

    puts("Hello World!");

    printf("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);     printf("This board features a(n) %s MCU.\n", RIOT_MCU);

    printf("longnum %016"PRIx64" %016llx\n", longnum, longnum);

Here's a summary of the output from the 4 devices:

   cc2538dk: longnum 1234567820001350 1234567812345678    samr21-xpro: longnum 000000000000000lx 000000000000000lx    redbee-econotag: longnum 1234567812345678 1234567812345678    native: longnum 1234567812345678 1234567812345678

and the compilers I'm using for each:

   cc2538dk: gcc version 4.3.2 (Sourcery G++ Lite 2008q3-66)
   samr21-xpro: gcc version 4.9.3 20141119 (release) [ARM/embedded-4_9-branch revision 218278] (GNU Tools for ARM Embedded Processors)    redbee-econotag: gcc version 4.3.2 (Sourcery G++ Lite 2008q3-66)    native: gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)

Is there something I'm doing that's obviously wrong?

- Ralph

#2

Hi Ralph!

Is there something I'm doing that's obviously wrong?

I guess this problem is related to the Newlib-Nano [1] we're using if the toolchain supports it. This library doesn't support 64-bit printing. If it's required for you, you could try to disable it in the Makefile (e.g. boards/samr21-xpro/Makefile.include, for the Atmel board), but you may run into memory problems then.

Cheers, Oleg

[1] https://github.com/32bitmicro/newlib-nano-1.0

#3

Hi Ralph!

Is there something I'm doing that's obviously wrong?

I guess this problem is related to the Newlib-Nano [1] we're using if the toolchain supports it. This library doesn't support 64-bit printing. If it's required for you, you could try to disable it in the Makefile (e.g. boards/samr21-xpro/Makefile.include, for the Atmel board), but you may run into memory problems then.

Ah, OK. Is printing the only limitation to use of 64-bit datatypes?

- Ralph

#4

Hi Ralph!

> I guess this problem is related to the Newlib-Nano [1] we're using if the > toolchain supports it. This library doesn't support 64-bit printing. If it's > required for you, you could try to disable it in the Makefile > (e.g. boards/samr21-xpro/Makefile.include, for the Atmel board), but you may > run into memory problems then.

Ah, OK. Is printing the only limitation to use of 64-bit datatypes?

Yes, everything else regarding 64-bit datatypes should work as expected.

Cheers, Oleg