Is sprintf() supposed to support uint64_t numbers?

[KiptonM]

This compiles with no warnings or errors:

 char buf[256];

uint64_t bignum = 0x123456789;

sprintf(buf,"bignum: 0x%016llx, %llu\r\n",bignum,bignum);

HAL_UART_Transmit_DMA(&huart1,(uint8_t *)buf, strlen(buf));

This comes out the terminal:

bignum: 0x000000000000000lx, lu

%I64d does not compile.

[Uwe Bonnes]

It depends on the libc used.

[KiptonM]

Thanks

How do I change the libc in STM32CubeIDE?

And which one should I use?

Where can I find the documentation?

[KiptonM]

googling STM32 libc does not get me anything.

[Pavel A.]

Select this:

[KiptonM]

I got it!

You have to select the project, then File->Properties. To get to that screen.

Thanks, that fixed it.