compiling twoo many syscalls.c ?

Posted on June 03, 2018 at 09:10

There is syscalls.c in the Project folder generated by the cube

and in the project path, I have syscalls.c in nano libraries.

I want to sprintf with floating point, that's why I included the nano library

Trying without nano..

it compiles now...

totally clean build from the cube:

I added this into main.c and it compiles:

printf('asd %f', 1.34);

but where does it print to ?

(Hoping to have my PCB by Tuesday for testing

:(

)

#compiler #nano

This topic has been closed for replies.

Senior III

Posted on June 03, 2018 at 13:16

I didnt think nano did floating point. quite the opposite - i have to remove it from the options in order to print fp.

>but where does it print to ?

where are you telling it to print to?

I put this in my function prototypes user code area:

#ifdef __GNUC__

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif /* __GNUC__ */

and i put this in user code 4 area:

PUTCHAR_PROTOTYPE

{

/* Place your implementation of fputc here */

/* e.g. write a character to the USART2 and Loop until the end of transmission */

HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFF);

return ch;

}

the nucleo boards all seem to have the stlink on uart2, but my f769i discovery board has it on uart1. check the manual.

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