Serial port alternate PINs, STM32F334R8

Questions » Serial port alternate PINs, STM32F334R8

7 years, 8 months ago.

Hi all,

on my custom board I use PC_4 for TX and PC_5 for RX (USART), however if I use Serial with (PC_4, PC_5) i get the error: Error: Identifier "PC_4" is undefined in "main.cpp", Line: 8, Col: 13

#include "mbed.h"

DigitalOut red_led(LED1);
DigitalOut blue_led(LED2);
DigitalOut orange_led(LED3);
DigitalOut green_led(LED4);

Serial pc (PC_4,PC_5);
int main() {
    
    while(1) {

        // LEDs ON
        red_led = 1;
        wait(0.2); // wait 200 ms
        blue_led = 1;
        wait(0.2); // wait 200 ms
        orange_led = 1;
        wait(0.2); // wait 200 ms
        green_led = 1;
        wait(0.2); // wait 200 ms
        
        // LEDs OFF
        red_led = 0;
        blue_led = 0;
        orange_led = 0;
        green_led = 0;
        pc.printf("");
        wait(0.5); // wait 500 ms
    }

Any workarround?

1 Answer

7 years, 8 months ago.

Hello Gorazd,
Which target board are you trying to compile for? I don't see the STM32F344R8 among the boards supported by mbed. So I guess it could be the NUCLEO-F334R8. But when using the online comiler your program copiles without any error for that board.

Accepted Answer

Hi,

yes I corrected my misstyped error. The uC is STM32F334R8. Allso using online compyler I get the same error.

posted by Gorazd Rosbach 27 Mar 2017

That's strange. I have tested your program again and for me it compiles smoothly for the NUCLEO-F334R8 target with the last compiled version of mbed library (revision 138). How did you compile online? The NUCLEO-F334R8 is not listed on your profile page. Which version and revision of mbed library do you use? Try to delete the current mbed library from your project and import the latest. If it still doesn't work and you'd like to test it I can publish my project with your program so you can import it. Later on I will delete it from my repository.
NOTE:
When I tried to compile the project for the DISCO-F334C8 (listed on your profile page) then I have got the following errors:
Identifier PC_4 is undefined "Serial pc(PC_4, PC_5);"
Identifier PC_5 is undefined "Serial pc(PC_4, PC_5);"

posted by Zoltan Hudak 27 Mar 2017

Hi!

Thank you very much. I used the NUCLEO target and now it works OK.

posted by Gorazd Rosbach 28 Mar 2017

Gorazd Rosbach

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7 years, 8 months ago.