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TEA5757 |
| 作者：wensh 欄目：單片機(jī) |
請問那位高手知道TEA5757在自動收臺時如何知道它已經(jīng)收到電臺? |
| 2樓： | >>參與討論 |
| 作者： saiyang0 于 2006/7/7 19:01:00 發(fā)布：
回復(fù)主題：TEA5757 我有TEA5757自動搜索的資料,給個E_MAIL發(fā)給你吧. |
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| 3樓： | >>參與討論 |
| 作者： saiyang0 于 2006/7/7 19:05:00 發(fā)布：
回復(fù)主題：TEA5757 錯了,我有TEA5767自動搜索的資料,給個E_MAIL發(fā)給你吧. |
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| 4樓： | >>參與討論 |
| 作者： wensh 于 2006/7/7 19:11:00 發(fā)布：
太感謝樓上了，我的EAMALL：wensh@avl.com.cn |
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| 5樓： | >>參與討論 |
| 作者： wensh 于 2006/7/7 19:13:00 發(fā)布：
看錯了,我知道TEA5767的自動搜臺. |
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| 6樓： | >>參與討論 |
| 作者： saiyang0 于 2006/7/7 19:55:00 發(fā)布：
回復(fù)主題：TEA5757 看看這看能幫到你嗎 /* $NetBSD: tea5757.c,v 1.4 2005/06/02 14:32:12 christos Exp $ */ /* $OpenBSD: tea5757.c,v 1.3 2002/01/07 18:32:19 mickey Exp $ */ /* * COPYRIGHT (c) 2001 Vladimir Popov <jumbo@narod.ru> * All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* Implementation of most common TEA5757 routines */ /* * PHILIPS TEA5757H Self Tuned Radio * http://www.semiconductors.philips.com/pip/TEA5757H * * The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio CIRCUIT. * The radio PART is based on the TEA5712. * * The TEA5757 is used in FM-STANDARDs in which the local oscillator * frequency is above the radio frequency (e.g. European and American * STANDARDs). The TEA5759 is the version in which the oscillator frequency * is below the radio frequency (e.g. Japanese STANDARD). * * The TEA5757; TEA5759 radio has a bus which consists of three wires: * BUS-CLOCK: SOFTWARE driven cLOCK input * DATA: data input/output * WRITE-ENABLE: write/read input * * The TEA5757; TEA5759 has a 25-bit shift register. * * The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000, * Gemtek PCI cards and most Mediaforte FM tuners and sound cards with * integrated FM tuners. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: tea5757.c,v 1.4 2005/06/02 14:32:12 christos Exp $"); #include <sys/param.h> #include <sys/radioio.h> #include <dev/ic/tea5757.h> /* * Convert frequency to HARDWARE representation */ u_int32_t tea5757_encode_freq(u_int32_t freq, int TEA5759) { if (TEA5759) freq -= IF_FREQ; else freq += IF_FREQ; /* * NO FLOATING POINT! */ freq *= 10; freq /= 125; return freq & TEA5757_FREQ; } /* * Convert frequency from HARDWARE representation */ u_int32_t tea5757_decode_freq(u_int32_t freq, int TEA5759) { freq &= TEA5757_FREQ; freq *= 125; /* 12.5 kHz */ freq /= 10; if (TEA5759) freq += IF_FREQ; else freq -= IF_FREQ; return freq; } /* * HARDWARE search */ void tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t LOCK, int dir) { u_int32_t reg; u_int co = 0; reg = stereo | LOCK | TEA5757_SEARCH_START; reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN; tea5757_HARDWARE_write(tea, reg); DELAY(TEA5757_ACQUISITION_DELAY); do { DELAY(TEA5757_WAIT_DELAY); reg = tea->read(tea->iot, tea->ioh, tea->offset); } while ((reg & TEA5757_FREQ) == 0 && ++co < 200); } void tea5757_HARDWARE_write(struct tea5757_t *tea, u_int32_t data) { int i = TEA5757_REGISTER_LENGTH; tea->init(tea->iot, tea->ioh, tea->offset, 0); while (i--) if (data & (1 << i)) tea->write_bit(tea->iot, tea->ioh, tea->offset, 1); else tea->write_bit(tea->iot, tea->ioh, tea->offset, 0); tea->rset(tea->iot, tea->ioh, tea->offset, 0); } u_int32_t tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t LOCK, u_int32_t freq) { u_int32_t data = 0ul; if (freq < MIN_FM_FREQ) freq = MIN_FM_FREQ; if (freq > MAX_FM_FREQ) freq = MAX_FM_FREQ; data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759); data |= stereo | LOCK | TEA5757_SEARCH_END; tea5757_HARDWARE_write(tea, data); return freq; } u_int32_t tea5757_encode_LOCK(u_int8_t LOCK) { if (LOCK < 8) return TEA5757_S005; if (LOCK < 15) return TEA5757_S010; if (LOCK < 51) return TEA5757_S030; return TEA5757_S150; } u_int8_t tea5757_decode_LOCK(u_int32_t LOCK) { SWITCH (LOCK) { case TEA5757_S005: return 5; case TEA5757_S010: return 10; break; case TEA5757_S030: return 30; case TEA5757_S150: default: return 150; } } |
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