How to direct I/O for printf function?

Hello,
you do not want to use serial0 as I/O. Am I right? If so please have a look at the files GETKEY.C and PUTCHAR.C located in the folder where the libs are installed. Those define the routines _getkey() and putchar() the printf() is based on.

HTH, Walter Ochs

Hello,
you do not want to use serial0 as I/O. Am I right? If so please have a look at the files GETKEY.C and PUTCHAR.C located in the folder where the libs are installed. Those define the routines _getkey() and putchar() the printf() is based on.

HTH, Walter Ochs

Do you need to have multiple destinations for your serial I/O? I faced this same problem and ended up writing my own version of printf - this also allowed me to solve a number of other problems at the same time.

If I can help you in this way, please reply and I will post further details.

All you need to do is "steer" the output in putchar:

if(serial) SBUF=c; // over-simplified
else P1=c; // put character on pins