Subject:
|
Re: I can't beep my handy (again)
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Sat, 14 Mar 1998 21:27:03 GMT
|
Original-From:
|
Will Bain <willbain@{spamless}cs.umt.edu>
|
Viewed:
|
1447 times
|
| |
|
|
German Gentile--
I know nothing about Imagecraft C, but here's how the beep function is
defined in lib_hb.c (the Interactive C library of functions written for the
Handy Board):
void beep()
{
tone(500., .1);
}
/* 1/2 cycle delay in .5us goes in 0x26 and 0x27 */
void tone(float frequency, float length)
{
set_beeper_pitch(frequency);
beeper_on();
sleep(length);
beeper_off();
}
void beeper_on()
{
bit_set(0x1020, 0b00000001);
bit_set(0x1022, 0b00001000);
}
void beeper_off()
{
bit_clear(0x1022, 0b00001000);
bit_clear(0x1020, 0b00000001);
bit_clear(0x1000, 0b00001000); /* turn power to spkr off */
}
void set_beeper_pitch(float frequency)
{
pokeword(0x26, (int)(1E6 / frequency));
}
If Imagecraft C has poke and bit manipulation functions, then you ought to
be able to translate this directly. Good luck.
--Will
, ,
__@_/ \_@__ |/
| /__, o @_/
)\ ) ( \ (\/\\,
~~~~~~~~~ ' ` ~~~~~~~~~~~ ` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wendy Parson, Conscience: the inner voice which warns us
Will Bain, that someone may be looking.
& Tatoosh --H. L. Mencken
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
