diff options
| author | augustss <augustss@NetBSD.org> | 2001-12-05 14:50:13 +0000 |
|---|---|---|
| committer | augustss <augustss@NetBSD.org> | 2001-12-05 14:50:13 +0000 |
| commit | 8c2cf4c7d88cf426e64d6dec2172d0ef752d70eb (patch) | |
| tree | 4c2f3e18cdfd898213552cdda6a3e678de740494 /sys/dev | |
| parent | 20b9d8348621bee52c4f4e18b5c3ba9621bf9f4e (diff) | |
Break out SIR framing to its own file.
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/ir/irframe.c | 4 | ||||
| -rw-r--r-- | sys/dev/ir/irframe_tty.c | 145 | ||||
| -rw-r--r-- | sys/dev/ir/sir.c | 143 | ||||
| -rw-r--r-- | sys/dev/ir/sir.h | 64 |
4 files changed, 235 insertions, 121 deletions
diff --git a/sys/dev/ir/irframe.c b/sys/dev/ir/irframe.c index 469f732282a..98b283b9928 100644 --- a/sys/dev/ir/irframe.c +++ b/sys/dev/ir/irframe.c @@ -1,4 +1,4 @@ -/* $NetBSD: irframe.c,v 1.7 2001/12/05 04:30:24 augustss Exp $ */ +/* $NetBSD: irframe.c,v 1.8 2001/12/05 14:50:14 augustss Exp $ */ /* * Copyright (c) 2001 The NetBSD Foundation, Inc. @@ -182,7 +182,7 @@ irframeopen(dev_t dev, int flag, int mode, struct proc *p) return (error); } sc->sc_open = 1; - irf_reset_params(sc); + (void)irf_reset_params(sc); return (0); } diff --git a/sys/dev/ir/irframe_tty.c b/sys/dev/ir/irframe_tty.c index 81791cfa344..8810eef47b2 100644 --- a/sys/dev/ir/irframe_tty.c +++ b/sys/dev/ir/irframe_tty.c @@ -1,4 +1,4 @@ -/* $NetBSD: irframe_tty.c,v 1.8 2001/12/05 04:31:02 augustss Exp $ */ +/* $NetBSD: irframe_tty.c,v 1.9 2001/12/05 14:50:14 augustss Exp $ */ /* * TODO @@ -46,7 +46,7 @@ /* * Loosely based on ppp_tty.c. - * Framing and dongle handing written by Tommy Bohlin. + * Framing and dongle handling written by Tommy Bohlin. */ #include <sys/param.h> @@ -63,6 +63,7 @@ #include <sys/poll.h> #include <dev/ir/ir.h> +#include <dev/ir/sir.h> #include <dev/ir/irdaio.h> #include <dev/ir/irframevar.h> @@ -80,13 +81,6 @@ int irframetdebug = 0; #define Static static #endif -/* Protocol constants */ -#define SIR_EXTRA_BOF 0xff -#define SIR_BOF 0xc0 -#define SIR_CE 0x7d -#define SIR_EOF 0xc1 - -#define SIR_ESC_BIT 0x20 /*****/ #define MAX_IRDA_FRAME 5000 /* XXX what is it? */ @@ -152,9 +146,8 @@ Static int irframet_get_speeds(void *h, int *speeds); Static int irframet_get_turnarounds(void *h, int *times); /* internal */ -Static int irt_write_buf(void *h, void *buf, size_t len); +Static int irt_write_frame(void *h, u_int8_t *buf, size_t len); Static int irt_putc(int c, struct tty *tp); -Static int irt_putesc(int c, struct tty *tp); Static void irt_frame(struct irframet_softc *sc, u_char *buf, u_int len); Static void irt_timeout(void *v); @@ -170,52 +163,6 @@ irframettyattach(int n) } /* - * CRC computation - */ -static const u_int16_t fcstab[] = { - 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, - 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, - 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, - 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, - 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, - 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, - 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, - 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, - 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, - 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, - 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, - 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, - 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, - 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, - 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, - 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, - 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, - 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, - 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, - 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, - 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, - 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, - 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, - 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, - 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, - 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, - 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, - 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, - 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, - 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, - 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, - 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 -}; - -#define INITFCS 0xffff -#define GOODFCS 0xf0b8 - -static __inline u_int16_t updateFCS(u_int16_t fcs, int c) { - return (fcs >> 8) ^ fcstab[(fcs^c) & 0xff]; -} - - -/* * Line specific open routine for async tty devices. * Attach the given tty to the first available irframe unit. * Called from device open routine or ttioctl. @@ -323,11 +270,7 @@ irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, sc->sc_dongle = *(int *)data; break; default: -#if 0 - error = irframeioctl(sc, cmd, data, flag, p); -#else error = EINVAL; -#endif break; } @@ -335,9 +278,7 @@ irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, } /* - * Start output on async tty interface. If the transmit queue - * has drained sufficiently, arrange for irframeasyncstart to be - * called later at splsoftnet. + * Start output on async tty interface. * Called at spltty or higher. */ int @@ -347,10 +288,6 @@ irframetstart(struct tty *tp) DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp)); - /* - * If there is stuff in the output queue, send it now. - * We are being called in lieu of ttstart and must do what it would. - */ if (tp->t_oproc != NULL) (*tp->t_oproc)(tp); @@ -579,6 +516,11 @@ irt_putc(int c, struct tty *tp) int s; int error; +#if IRFRAMET_DEBUG + if (irframetdebug > 3) + DPRINTF(("%s: tp=%p c=0x%02x cc=%d\n", __FUNCTION__, tp, c, + tp->t_outq.c_cc)); +#endif if (tp->t_outq.c_cc > tp->t_hiwat) { irframetstart(tp); s = spltty(); @@ -605,75 +547,38 @@ irt_putc(int c, struct tty *tp) } int -irt_putesc(int c, struct tty *tp) -{ - int error; - - if (c == SIR_BOF || c == SIR_EOF || c == SIR_CE) { - error = irt_putc(SIR_CE, tp); - if (!error) - error = irt_putc(SIR_ESC_BIT^c, tp); - } else { - error = irt_putc(c, tp); - } - return (error); -} - -int irframet_write(void *h, struct uio *uio, int flag) { + struct tty *tp = h; + struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc; u_int8_t buf[MAX_IRDA_FRAME]; - size_t n; - int error; + int n; DPRINTF(("%s: resid=%d, iovcnt=%d, offset=%ld\n", __FUNCTION__, uio->uio_resid, uio->uio_iovcnt, (long)uio->uio_offset)); - n = uio->uio_resid; - if (n > MAX_IRDA_FRAME) - return (EINVAL); - error = uiomove(buf, n, uio); - if (error) - return (error); - return (irt_write_buf(h, buf, n)); + n = irda_sir_frame(buf, MAX_IRDA_FRAME, uio, sc->sc_ebofs); + if (n < 0) + return (-n); + return (irt_write_frame(h, buf, n)); } int -irt_write_buf(void *h, void *buf, size_t len) +irt_write_frame(void *h, u_int8_t *buf, size_t len) { struct tty *tp = h; - struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc; - u_int8_t *cp = buf; - int c, error, ofcs, i; + int error, i; DPRINTF(("%s: tp=%p len=%d\n", __FUNCTION__, tp, len)); - ofcs = INITFCS; error = 0; - - for (i = 0; i < sc->sc_ebofs; i++) - irt_putc(SIR_EXTRA_BOF, tp); - irt_putc(SIR_BOF, tp); - - while (len-- > 0) { - c = *cp++; - ofcs = updateFCS(ofcs, c); - error = irt_putesc(c, tp); - if (error) - return (error); - } - - ofcs = ~ofcs; - error = irt_putesc(ofcs & 0xff, tp); - if (!error) - error = irt_putesc((ofcs >> 8) & 0xff, tp); - if (!error) - error = irt_putc(SIR_EOF, tp); + for (i = 0; !error && i < len; i++) + error = irt_putc(buf[i], tp); irframetstart(tp); - DPRINTF(("%s: done\n", __FUNCTION__)); + DPRINTF(("%s: done, error=%d\n", __FUNCTION__, error)); return (error); } @@ -689,9 +594,11 @@ irframet_poll(void *h, int events, struct proc *p) DPRINTF(("%s: sc=%p\n", __FUNCTION__, sc)); s = splir(); - /* XXX should check with tty */ + /* XXX is this a good check? */ if (events & (POLLOUT | POLLWRNORM)) - revents |= events & (POLLOUT | POLLWRNORM); + if (tp->t_outq.c_cc <= tp->t_lowat) + revents |= events & (POLLOUT | POLLWRNORM); + if (events & (POLLIN | POLLRDNORM)) { if (sc->sc_nframes > 0) { DPRINTF(("%s: have data\n", __FUNCTION__)); diff --git a/sys/dev/ir/sir.c b/sys/dev/ir/sir.c new file mode 100644 index 00000000000..3a791bc98de --- /dev/null +++ b/sys/dev/ir/sir.c @@ -0,0 +1,143 @@ +/* $NetBSD: sir.c,v 1.1 2001/12/05 14:50:14 augustss Exp $ */ + +/* + * Copyright (c) 2001 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Lennart Augustsson (lennart@augustsson.net) and Tommy Bohlin + * (tommy@gatespace.com). + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Framing originally written by Tommy Bohlin. + */ + +#include <sys/param.h> +#include <sys/conf.h> +#include <sys/systm.h> + +#include <dev/ir/sir.h> + +/* + * CRC computation table + */ +const u_int16_t irda_fcstab[] = { + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + + +#define MAX_IRDA_FRAME 5000 /* XXX what is it? */ + +#define PUTC(c) if (p < end) *p++ = (c) +#define PUTESC(c) \ + if (c == SIR_BOF || c == SIR_EOF || c == SIR_CE) { \ + PUTC(SIR_CE); \ + PUTC(SIR_ESC_BIT^c); \ + } else { \ + PUTC(c); \ + } + +int +irda_sir_frame(u_int8_t *obuf, u_int maxlen, struct uio *uio, u_int ebofs) +{ + u_int8_t ibuf[MAX_IRDA_FRAME]; + u_int8_t *p, *end, *cp; + size_t n; + int error; + int i; + int c; + u_int16_t ofcs; + + n = uio->uio_resid; + if (n > MAX_IRDA_FRAME) + return (EINVAL); + error = uiomove(ibuf, n, uio); + if (error) + return (-error); + + end = obuf + maxlen; + + for (i = 0; i < ebofs; i++) + PUTC(SIR_EXTRA_BOF); + PUTC(SIR_BOF); + + ofcs = INITFCS; + cp = ibuf; + while (n-- > 0) { + c = *cp++; + ofcs = updateFCS(ofcs, c); + PUTESC(c); + } + + ofcs = ~ofcs; + c = ofcs & 0xff; + PUTESC(c); + c = (ofcs >> 8) & 0xff; + PUTESC(c); + PUTC(SIR_EOF); + + if (p < end) + return (p - obuf); + else + return (-EINVAL); +} diff --git a/sys/dev/ir/sir.h b/sys/dev/ir/sir.h new file mode 100644 index 00000000000..d33fb93cf20 --- /dev/null +++ b/sys/dev/ir/sir.h @@ -0,0 +1,64 @@ +/* $NetBSD: sir.h,v 1.1 2001/12/05 14:50:14 augustss Exp $ */ + +/* + * Copyright (c) 2001 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Lennart Augustsson (lennart@augustsson.net) and Tommy Bohlin + * (tommy@gatespace.com). + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Framing originally written by Tommy Bohlin. + */ + +/* Protocol constants */ +#define SIR_EXTRA_BOF 0xff +#define SIR_BOF 0xc0 +#define SIR_CE 0x7d +#define SIR_EOF 0xc1 + +#define SIR_ESC_BIT 0x20 + +int irda_sir_frame(u_int8_t *buf, u_int maxlen, struct uio *uio, u_int ebofs); + +/* + * CRC computation + */ +#define INITFCS 0xffff +#define GOODFCS 0xf0b8 + +extern const u_int16_t irda_fcstab[]; + +static __inline u_int16_t updateFCS(u_int16_t fcs, int c) { + return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff]; +} |
