80 lines
2.7 KiB
Groff
80 lines
2.7 KiB
Groff
.\" $NetBSD: tea5767radio.4,v 1.3 2020/08/28 16:07:49 fcambus Exp $
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.\"
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.\" Copyright (c) 2018 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Karuna Grewal.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 6, 2018
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.Dt TEA5767RADIO 4
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.Os
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.Sh NAME
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.Nm tea5767
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.Nd Philips/NXP TEA5767 FM Chip
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.Sh SYNOPSIS
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.Cd "tea5767radio* at iic? addr 0x60 flags 0x00"
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.Cd "radio* at tea5767radio?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the Philips/NXP TEA5767 FM stereo radio.
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.Pp
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The
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.Nm
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can tune in the range 87.5 \- 108.0 MHz, perform hardware signal search
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and supports mono/stereo toggling.
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.Pp
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The flags control the FM Band, XTAL, and PLL values as follows:
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.Bl -tag -width Ds
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.It 0x01
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Sets the FM Band to Japan.
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.It 0x02
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Sets the PLL bit.
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.It 0x04
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Sets the XTAL bit.
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.It 0x08
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Force enables hardware search support.
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.El
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.Sh SEE ALSO
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.Xr iic 4 ,
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.Xr radio 4 ,
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.Xr radio 9
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.Rs
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.%A TEA5767
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.%T Low-power FM stereo radio
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.%N Rev. 05
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.%D 26 January 2007
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.Re
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.Sh CAVEATS
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Many popular TEA5767 evaluation boards feature low quality 32.768kHz crystals.
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The inaccuracy of these crystals may often lead to malfunction of the hardware
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search function.
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Therefore, the
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.Nm
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driver tries to detect the crystal quality during attachment.
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If the crystal
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of insufficient accuracy was detected, the hardware search function is disabled.
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It can be forcefully re-enabled by setting the 0x08 flag.
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