Where is scanf defined?

RE: Where is scanf defined?

AmiguelS — Wed, 26 Apr 2017 14:03:12 GMT

Works like a charm. Thanks!

RE: Where is scanf defined?

Jørgen Holmefjord — Wed, 26 Apr 2017 11:33:12 GMT

You can place it anywhere you want, just remove the original retarget.c source file from your project and include the new one.

RE: Where is scanf defined?

AmiguelS — Wed, 26 Apr 2017 11:31:21 GMT

I see, thanks for the reply! If I wanted to write a new retarget.c , using other communication protocol, where would I place the new file, and what changes would I have to do in order to use my file instead of the SDK one?

RE: Where is scanf defined?

Jørgen Holmefjord — Wed, 26 Apr 2017 11:16:51 GMT

Hi,

printf and scanf are, as you indicated, defined in the C library stdio.h. The communication on the UART interface is handled by the app_uart module, and more specific, the functions app_uart_put and app_uart_get. The stdio functions can be retargeted to use the app_uart module to read and write data using the UART interface. You can find the implementation of these functions in the file retarget.c. You will also have to enable retargeting in sdk_config.h, by setting #define RETARGET_ENABLED 1.

Best regards,

Jørgen