Subject:
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Re: HB Serial line speed change
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 24 Jul 1999 00:24:45 GMT
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Original-From:
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George Musser Jr <gmusser@hotmail.ANTISPAMcom>
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Reply-To:
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georgejr@NOSPAMmusser.com
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Viewed:
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871 times
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Here is the relevant function. Note that it only works for baud rates up to
9600.
void set_baud(int rate) /* For an 8 MHz clock */
{
if (rate >= 300)
poke(BAUD, 0xb0 | log2(9600/rate));
}
You'll need regdefines.c (for the address of BAUD) as well as the following
function:
int log2(int x) /* 2**logx <= x < 2**(logx+1) */
{
int logx;
if (x) {
logx = 15;
while (!(0x8000 & x)) {
x <<= 1;
logx--;
}
return logx;
}
else
return -1;
}
I personally like the generality of invoking log2(), but you can of course
use a series of if statements instead.
There is also a location in the pcode interpreter that you can POKE to
change the baud rate used by IC. But until IC can adjust its rate, this
operation will break the connection.
George
--
George Musser
georgejr@musser.com
KF6LOJ
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