Handy Board FAQ Answers: “serial”
How do I read and write to the serial line from an Interactive C program?
It is possible for an IC program to use the serial port. Randy Sargent's instructions athttp://www.ai.mi t.edu/people/rsargent/ic/serialio.htmlwere written for the 6.270 board, but are directly applicable for the Handy Board running Interactive C.
Then, you can print numbers using (for example) the following printdec() routine:
/*
printdec.c
routine to output an integer value
as a decimal number over the serial line
requires serialio.c
*/
/* prints number over serial line */
void printdec(int n)
{
int leading_digit= 0;
int dig, div;
if (n == 0) {
_printnum(0);
return;
}
if (n < 0) {
serial_putchar('-');
n = 0 - n;
}
for (div= 10000; div= div/10; div> 0) {
dig= n/div;
n= n - dig*div;
if (dig || leading_digit) {
_printnum(dig);
leading_digit= 1;
}
}
}
/* prints digit from 0 to 9 over serial line */
void _printnum(int n)
{
serial_putchar(n + '0');
}
To start a new line on the serial output, use:
void newline() {
serial_putchar(10);
serial_putchar(13);
}
(Last updated 2000-09-27)