Subject:
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Re: Handy Board serial routines
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 14 Mar 1997 05:38:20 GMT
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Original-From:
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Xavier Chabot <chabot@rpi=AvoidSpam=.edu>
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Viewed:
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4101 times
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>
> Greetings,
>
> The serial port could be used after downloading the program
> code into memory for other purposes (such as controlling the
> mini-ssc board). However, I have not found any reference to
> RS-232C port IC commands, so one would have to build custom
> assembly code to access the serial port. Of course, there
> may be some firmware impediment to that...( handyboard
> experienced users, please)?
>
> Marco A.A. de Oliveira assfalk@eece.unm.edu
> ------------------------------------------------------------
> EE PhD Candidate UNM/NASA ACE Center
> ----------------------------------------http://ace.unm.edu--
/* ----------------- SENDING AND RECEIVING THROUGH THE SERIAL LINE -----------
the IC program must be stopped in order for this to work !
the code is from the handybaord FAQ by Fred Martin or ?? Randy Sargent ??
added by Xavier Chabot, 3-3-97: serial_getchar2()
receiving from the serial port:
disable_pcode_serial(): prevents the onboard pcode to catch the incoming
serial data
reenable_pcode_serial(void): reestablishes connection
serial_getchar(): returns a character send from the computer
sending to the serial port:
blocking: serial_getchar(): waits until a character is sent
the character is return as int
non blocking: serial_getchar2(&val) checks if there is a character to be
read. the character is written at the address val. returns 0 if there is
something, -1 if there is nothing
*/
/* --------------- READ from serial port ------------------- */
void disable_pcode_serial(void)
{
poke(0x3c,1);
}
void reenable_pcode_serial(void)
{
poke(0x3c,0);
}
/* blocking read */
int serial_getchar()
{
while(!(peek(0x102e) & 0x20)); /* wait UART */
return peek(0x102f);
}
/* test UART and get char but no wait */
int serial_getchar2(int *val)
{
if (peek(0x102e) & 0x20) /* UART ready? */
{
*val = peek(0x102f);
return 0;
}
return -1;
}
/* --------------------- WRITE to serial port --------------------------*/
/* writes a character to the serial port - blocks until free */
void serial_putchar(int c)
{
while (!(peek(0x102e) & 0x80) ); /* wait UART */
poke(0x102f, c);
}
Xavier Chabot / Assistant Professor of Music / Department of the Arts
iEAR Studios - DCC 135 / Rensselaer Polytechnic Institute / Troy, NY 12180
Phone: (518) 276-4032 Fax: (518) 276-4780 http://www.rpi.edu/dept/iear/~chabot
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