Subject:
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Easy communication between HBs
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 17 Feb 1999 04:16:02 GMT
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Original-From:
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Peter Eacmen <eacmen@postofficeSTOPSPAMMERS.worldnet.att.net>
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Viewed:
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1613 times
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After struggling with it for many hours I found an alternative to Randy's
serialio.c serial communication which I couldn't get working. So I used
the Pa7_9600 Baud Serial output from unknown origin (Fred?)
(http://el.www.media.mit.edu/groups/el/projects/handy-board/software/ser
ial.html).
I cut a standard RJ11 cable and soldered the Rx line(yellow) and the
ground(red) to the ends of a length 4 header. The header goes into the
transmitting HB and the RJ11 connector goes into the RJ11 jack on the
recieving HB. On the transmitting HB the header goes to digital input 9
with the yellow end up towards the LCD.
If you have questions post to mailing list I might be able to help.
Here's some sample code:
Transmitting HB:
/* sertest.c: tests pa7_9600() serial output routine */
void main() {
int i;
while (1) {
for (i= 'A'; i<='z'; i++) {
pa7_9600(i);
printf("%c\n", i);
msleep(100L);
}
pa7_9600(13); /* send carriage return */
pa7_9600(10); /* send line feed */
}
}
Recieving HB:
void disable_pcode_serial() /* disable board handshaking with IC */
/* on the host computer, allowing user */
/* programs to receive serial data */
{
poke(0x3c, 1);
}
int serial_getchar() /* read a serial character. Note: the */
/* program hangs until a character is */
/* received! There is no timeout! */
{
while (!(peek(0x102e) & 0x20)); /* wait until a character arrives
*/
return (peek(0x102f)); /* return it as an int */
}
void main()
{
int x=0;
disable_pcode_serial();
while(1)
{
printf("\n%c",serial_getchar());
}
}
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