Subject:
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Problem to send long messages from RCX to PC via com Hack
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 10 Jun 2008 07:13:24 GMT
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Viewed:
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24588 times
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Hi,
Once again i am back about RCX and BT-Connection.
Receiving messages from the PC via BT to the RCX is OK.
But if I send messages from the RCX to the PC with 4800 Baud i get only 4 Bytes.
So I go back to 2400 Baud, forget BT and make a serial Connection via RS232 to
the PC.
Now i got only to bytes via rs232 in the pc.
1) I checked the result of the send procedure :
Oh i get -1: means tx/rx Collission
void SendInt()
{
int result;
unsigned char buf_integrity[8];
buf_integrity[0] = 'A';
buf_integrity[1] = 'B'; // no more will be send
buf_integrity[2] = 'C';
buf_integrity[3] = 'D';
buf_integrity[4] = 'E';
buf_integrity[5] = 'F';
buf_integrity[6] = 'G';
buf_integrity[7] = 'H';
result = lnp_integrity_write( buf_integrity, sizeof(buf_integrity));
lcd_digit(RxNr);
lcd_int(result);
RxNr++;
if (RxNr > 9) RxNr=0;
}
I remember about the thread 4018 from Claude Baumann
I take a camera (you can see if the IF-leds on the rcx are flickering if TX) and
I see: the rcx is tx via the IF-leds.
I don't know why i get the tx signal back to rx pin, because i have cut the
receiverline in the rcx (IR-Receiver rx pin)
as shown http://www.convict.lu/Jeunes/RCXCam/RCXCam_Journal.htm
in the main program i do now:
cputs("if--") ; sleep(1);
//! disable IR carrier frequency. // carrier_shutdown();
//extern inline void carrier_shutdown(void)
T1_CR =0;
T1_CSR =0;
// --------------- does not work ----------------------------
// and set the port6<7> pin LOW. Now the upper PNP
//transistor isn't conducting anymore.
// Port Bit Description Notes
// 6 7 Infrared carrier (TMO1) 26µs square wave
cputs("pt67") ; sleep(1);
cputw(PORT6); sleep(2);
cputs("cler") ; sleep(1);
bit_clear(&PORT6,7); sleep(1);
cputw(PORT6); sleep(1);
any suggest?
Bernhard
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