You need to write to the IR port directly -- what you're describing is
actually in the Irda spec (under Ultra) but isn't often implemented. We use
this in the HP Cooltown environment, and it works. Receiving a frame is a
bit more work, let me know if you need to do it.
This is some code that works reasonably well:
// CRC table
#include "ccittcrc.h" // see below for this file
// From Linux IRDA srcs
#define INIT_FCS 0xffff /* Initial FCS value */
#define GOOD_FCS 0xf0b8 /* Good final FCS value */
#define IR_FCS(fcs, byte) (((fcs)>>8)^crc_table[((fcs)^(byte)) & 0xff])
//
// Globals
//
static UInt sirRefNum = sysInvalidRefNum;
//
// Open Serial IR
// uses standard 9600bps speed for Ultra
//
void OpenSIR() {
Err err = 0;
if (IsIRDAOpen()) return; // IRDA port open!
if (sirRefNum == sysInvalidRefNum) {
err = SysLibFind ("Serial Library", &sirRefNum);
if (err) return;
err = SerOpen (sirRefNum, 0, 9600);
if (err && (err != serErrAlreadyOpen)) {
// Error recovery here!
return;
}
// use IR Mode for Serial Port (bare bones Ultra support)
SerControl(sirRefNum, serCtlIrDAEnable, 0, 0);
}
}
// close
void CloseSIR() {
if (sirRefNum != sysInvalidRefNum) {
// close down serial port
SerControl(sirRefNum , serCtlIrDADisable, 0, 0);
SerClose (sirRefNum); // close serial link
}
}
//
// Low-level IRDA broadcast frame sender
//
void WriteSIR(char * xml) {
unsigned char header[] = {
0xff,
0xff,
0xff,
0xff, // framing bytes
0xc0, // start of packet
0xff, // IrLAP Broadcast packet
0x03, // IrLAP : packet type -> UI frame (+ no poll)
0x70, // dest =
0x70, // src = Broadcast
0x03 // Protocol ID (0x01-0x0f valid values)
};
unsigned char esc, *crcBuf;
Err err=0;
ULong numSent;
static unsigned short crc;
// send header
numSent = SerSend(sirRefNum, (VoidPtr) header, 10, &err);
if ( numSent != 10 ) {
return;
}
// send packet (360 bytes MAX) and calc CRC
// NOTE: this code assumes a null terminated string in xml
crc = INIT_FCS;
crc = IR_FCS(crc, 0xff);
crc = IR_FCS(crc, 0x03);
crc = IR_FCS(crc, 0x70);
crc = IR_FCS(crc, 0x70);
crc = IR_FCS(crc, 0x03);
while (*xml) {
crc = IR_FCS(crc, *xml);
if (SerSend(sirRefNum, (VoidPtr) xml, 1, &err) != 1) {
return;
}
xml++;
}
// this code also sends the null byte on the end
crc = IR_FCS(crc, *xml);
if (SerSend(sirRefNum, (VoidPtr) xml, 1, &err) != 1) {
return;
}
// send the CRC bytes.
// note that since these are binary they may happen to be 0xC0 or
0xC1, so we
// need to escape them if they are. If you're sending binary data
you'll need to
// possibly escape any byte in the packet.
crc = ~crc;
crcBuf = (unsigned char *) &crc;
esc = 0x7d;
++crcBuf;
if ((*crcBuf == 0xc0) || (*crcBuf == 0xc1)) {
if (SerSend(sirRefNum, (VoidPtr) &esc, 1, &err) !=
1) {
return;
}
*crcBuf ^= 0x20;
if (SerSend(sirRefNum, (VoidPtr) crcBuf, 1, &err) !=
1) {
return;
}
}
else {
if (SerSend(sirRefNum, (VoidPtr) crcBuf, 1, &err) !=
1) {
return;
}
}
--crcBuf;
if ((*crcBuf == 0xc0) || (*crcBuf == 0xc1)) {
if (SerSend(sirRefNum, (VoidPtr) &esc, 1, &err) !=
1) {
return;
}
*crcBuf ^= 0x20;
if (SerSend(sirRefNum, (VoidPtr) crcBuf, 1, &err) !=
1) {
return;
}
}
else {
if (SerSend(sirRefNum, (VoidPtr) crcBuf, 1, &err) !=
1) {
return;
}
}
// send EOFrame
esc = 0xc1;
SerSend(sirRefNum, (VoidPtr) &esc, 1, &err);
}
// ccittcrc.h
unsigned short crc_table[256] = {
0,
0x1189,
0x2312,
0x329b,
0x4624,
0x57ad,
0x6536,
0x74bf,
0x8c48,
0x9dc1,
0xaf5a,
0xbed3,
0xca6c,
0xdbe5,
0xe97e,
0xf8f7,
0x1081,
0x108,
0x3393,
0x221a,
0x56a5,
0x472c,
0x75b7,
0x643e,
0x9cc9,
0x8d40,
0xbfdb,
0xae52,
0xdaed,
0xcb64,
0xf9ff,
0xe876,
0x2102,
0x308b,
0x210,
0x1399,
0x6726,
0x76af,
0x4434,
0x55bd,
0xad4a,
0xbcc3,
0x8e58,
0x9fd1,
0xeb6e,
0xfae7,
0xc87c,
0xd9f5,
0x3183,
0x200a,
0x1291,
0x318,
0x77a7,
0x662e,
0x54b5,
0x453c,
0xbdcb,
0xac42,
0x9ed9,
0x8f50,
0xfbef,
0xea66,
0xd8fd,
0xc974,
0x4204,
0x538d,
0x6116,
0x709f,
0x420,
0x15a9,
0x2732,
0x36bb,
0xce4c,
0xdfc5,
0xed5e,
0xfcd7,
0x8868,
0x99e1,
0xab7a,
0xbaf3,
0x5285,
0x430c,
0x7197,
0x601e,
0x14a1,
0x528,
0x37b3,
0x263a,
0xdecd,
0xcf44,
0xfddf,
0xec56,
0x98e9,
0x8960,
0xbbfb,
0xaa72,
0x6306,
0x728f,
0x4014,
0x519d,
0x2522,
0x34ab,
0x630,
0x17b9,
0xef4e,
0xfec7,
0xcc5c,
0xddd5,
0xa96a,
0xb8e3,
0x8a78,
0x9bf1,
0x7387,
0x620e,
0x5095,
0x411c,
0x35a3,
0x242a,
0x16b1,
0x738,
0xffcf,
0xee46,
0xdcdd,
0xcd54,
0xb9eb,
0xa862,
0x9af9,
0x8b70,
0x8408,
0x9581,
0xa71a,
0xb693,
0xc22c,
0xd3a5,
0xe13e,
0xf0b7,
0x840,
0x19c9,
0x2b52,
0x3adb,
0x4e64,
0x5fed,
0x6d76,
0x7cff,
0x9489,
0x8500,
0xb79b,
0xa612,
0xd2ad,
0xc324,
0xf1bf,
0xe036,
0x18c1,
0x948,
0x3bd3,
0x2a5a,
0x5ee5,
0x4f6c,
0x7df7,
0x6c7e,
0xa50a,
0xb483,
0x8618,
0x9791,
0xe32e,
0xf2a7,
0xc03c,
0xd1b5,
0x2942,
0x38cb,
0xa50,
0x1bd9,
0x6f66,
0x7eef,
0x4c74,
0x5dfd,
0xb58b,
0xa402,
0x9699,
0x8710,
0xf3af,
0xe226,
0xd0bd,
0xc134,
0x39c3,
0x284a,
0x1ad1,
0xb58,
0x7fe7,
0x6e6e,
0x5cf5,
0x4d7c,
0xc60c,
0xd785,
0xe51e,
0xf497,
0x8028,
0x91a1,
0xa33a,
0xb2b3,
0x4a44,
0x5bcd,
0x6956,
0x78df,
0xc60,
0x1de9,
0x2f72,
0x3efb,
0xd68d,
0xc704,
0xf59f,
0xe416,
0x90a9,
0x8120,
0xb3bb,
0xa232,
0x5ac5,
0x4b4c,
0x79d7,
0x685e,
0x1ce1,
0xd68,
0x3ff3,
0x2e7a,
0xe70e,
0xf687,
0xc41c,
0xd595,
0xa12a,
0xb0a3,
0x8238,
0x93b1,
0x6b46,
0x7acf,
0x4854,
0x59dd,
0x2d62,
0x3ceb,
0xe70,
0x1ff9,
0xf78f,
0xe606,
0xd49d,
0xc514,
0xb1ab,
0xa022,
0x92b9,
0x8330,
0x7bc7,
0x6a4e,
0x58d5,
0x495c,
0x3de3,
0x2c6a,
0x1ef1,
0xf78,
};
Enjoy!
-- John Schettino
Palm OS Programming For Dummies: http://schettino.tripod.com
-----Original Message-----
From: Brian Whitman [mailto:[EMAIL PROTECTED]]
Sent: Saturday, August 19, 2000 8:51 PM
To: Palm Developer Forum
Subject: Sending IrDA frame without all the mess
I just want to send an arbitrary amount of bytes out my Palm's IR port.
(Palm VII) -- I guess this would be an "IrDA Frame" C0 -> data -> C1. but
the Palm API for IR is too complex for what I need to do... I don't need
to set up an exchange or connection. What do I call to just send arbitrary
data out and not worry about data coming back in?
Thanks,
Brian
--
Brian Whitman
[EMAIL PROTECTED]
Crudites Sound Ventures
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