Timo Zerrer

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12 years, 4 months ago.

Serial Communication

Hello,

I've got a problem regarding Serial Communication between a Computer and the board. It was kinda easy, to get single Character inputs with the pc.getc(); command, but i couldnt figure out yet how to get full Strings, like a full Command, that can be put into a String for comparing.

I tried the fgets("%s",string); function, but it didnt work out yet, to get a row of characters. Has anybody an idea how an multi character command could be read and Compared?

both pc.fgets and pc.scanf did not work.

thinking of

pc.fgets(entry, 20);
.....
if(string== "xy")
       .....

kind regards

1 Answer

Ney Palma
12 years, 4 months ago.

Hi Timo to get a string from the serial you should do:

Serial pc(USBTX, USBRX);
 
int main() {
    char c;
    char buffer[128];
        
    pc.gets(buffer, 4);
 
    pc.printf("I got '%s'\n", buffer);    
}

To compare the string received with your command you can´t use ==, use strcmp instead like this

        if(strcmp(buffer,"on")==0) {
            //do something
        }

I hope this will help you

Greetings