Retarget scanf on STM32G070RBxx Cortex M0+

[AVerm.4]

(originally a reply to https://community.st.com/t5/stm32cubeide-mcus/retarget-printf-on-stm32g070rbxx-cortex-m0/td-p/720883)

 

Hi @Andrew Neil,

For the scanf do we need to make any other change?

My read function is-

 

 

int _read(int fd, char *ptr, int len){
 (void)fd;
 int i;
 for(i=0;i<len;i++){
 *ptr++ = uart_read();
 }
 return len;
}

 

 

In the terminal window it is not taking any keypress.

[Andrew Neil]

I've not tried it.

I guess you would still need to do the extern "C" and anything else specific to C++ ...

[AVerm.4]

@Andrew Neil 

This I'm trying on C. The cursor doesn't take input on keypress.

[Andrew Neil]

---

@AVerm.4 wrote:

the cursor doesn't take input on keypress.

---

What do you mean by that?

Do you mean the keypress doesn't appear on your terminal?

If you want that, it's called echo - it can be either local or remote:

• Local - performed purely in the terminal itself
• Remote - the echo is performed by your software.

Again, beware of the line buffering.

 

If you put a breakpoint in your _read function, is it hit ?

[Pavel A.]

 

setbuf(stdin, NULL);