diff options
Diffstat (limited to 'static/freebsd/man4/man4.arm/ti_adc.4')
| -rw-r--r-- | static/freebsd/man4/man4.arm/ti_adc.4 | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/static/freebsd/man4/man4.arm/ti_adc.4 b/static/freebsd/man4/man4.arm/ti_adc.4 new file mode 100644 index 00000000..fb59e1d3 --- /dev/null +++ b/static/freebsd/man4/man4.arm/ti_adc.4 @@ -0,0 +1,126 @@ +.\" +.\" Copyright (c) 2014 Luiz Otavio O Souza <loos@freebsd.org> +.\" 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. +.\" +.Dd June 1, 2014 +.Dt TI_ADC 4 arm +.Os +.Sh NAME +.Nm ti_adc +.Nd TI AM3XXX analog to digital converter driver +.Sh SYNOPSIS +.Cd "device ti_adc" +.Sh DESCRIPTION +The +.Nm +driver provides access to the AIN (analog inputs) on am3xxx SoCs. +.Pp +It provides raw readings of the converted values for each analog inputs. +.Pp +The access to +.Nm +data is made via the +.Xr sysctl 8 +interface: +.Bd -literal +dev.ti_adc.0.%desc: TI ADC controller +dev.ti_adc.0.%driver: ti_adc +dev.ti_adc.0.%pnpinfo: name=adc@44E0D000 compat=ti,adc +dev.ti_adc.0.%parent: simplebus0 +dev.ti_adc.0.clockdiv: 2400 +dev.ti_adc.0.ain.0.enable: 0 +dev.ti_adc.0.ain.0.open_delay: 0 +dev.ti_adc.0.ain.0.samples_avg: 0 +dev.ti_adc.0.ain.0.input: 0 +dev.ti_adc.0.ain.1.enable: 0 +dev.ti_adc.0.ain.1.open_delay: 0 +dev.ti_adc.0.ain.1.samples_avg: 0 +dev.ti_adc.0.ain.1.input: 0 +dev.ti_adc.0.ain.2.enable: 0 +dev.ti_adc.0.ain.2.open_delay: 0 +dev.ti_adc.0.ain.2.samples_avg: 0 +dev.ti_adc.0.ain.2.input: 0 +dev.ti_adc.0.ain.3.enable: 0 +dev.ti_adc.0.ain.3.open_delay: 0 +dev.ti_adc.0.ain.3.samples_avg: 0 +dev.ti_adc.0.ain.3.input: 0 +dev.ti_adc.0.ain.4.enable: 0 +dev.ti_adc.0.ain.4.open_delay: 0 +dev.ti_adc.0.ain.4.samples_avg: 0 +dev.ti_adc.0.ain.4.input: 0 +dev.ti_adc.0.ain.5.enable: 0 +dev.ti_adc.0.ain.5.open_delay: 0 +dev.ti_adc.0.ain.5.samples_avg: 0 +dev.ti_adc.0.ain.5.input: 0 +dev.ti_adc.0.ain.6.enable: 1 +dev.ti_adc.0.ain.6.open_delay: 0 +dev.ti_adc.0.ain.6.samples_avg: 4 +dev.ti_adc.0.ain.6.input: 2308 +dev.ti_adc.0.ain.7.enable: 1 +dev.ti_adc.0.ain.7.open_delay: 0 +dev.ti_adc.0.ain.7.samples_avg: 0 +dev.ti_adc.0.ain.7.input: 3812 +.Ed +.Pp +On Beaglebone-black the analog input 7 is connected to the 3V3B rail through +a voltage divisor (2:1). +The 3V3B voltage rail comes from the TL5209 LDO regulator which is limited +to 500mA maximum. +.Pp +Global settings: +.Bl -tag -width ".Va dev.ti_adc.0.clockdiv" +.It Va dev.ti_adc.0.clockdiv +Sets the ADC clock prescaler. +The minimum value is 10 and the maximum is 65535. +The ADC clock is based on CLK_M_OSC (24Mhz) / clockdiv. +This gives a maximum of ~2.4Mhz for the ADC clock and ~10Khz for the default +setting (clockdiv = 2400). +.El +.Pp +Settings per input: +.Bl -tag -width ".Va dev.ti_adc.0.ain.%d.samples_avg" +.It Va dev.ti_adc.0.ain.%d.enable +Enable the conversion for the input. +Each input should be individually enabled before it can be used. +When all the inputs are disabled, the ADC is turned off. +.It Va dev.ti_adc.0.ain.%d.open_delay +Sets the number of ADC clock cycles to wait after applying the input +configuration and before start the ADC conversion. +.It Va dev.ti_adc.0.ain.%d.samples_avg +Sets the number of samples average used on each input, it can be set to 0 +(no samples average), 2, 4, 8, or 16. +.It Va dev.ti_adc.0.ain.%d.input +Is the converted raw value of the voltage applied on the analog input. +It is made of a 12 bit value (0 ~ 4095). +.El +.Sh SEE ALSO +.Xr sysctl 8 +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 10.1 . +.Sh AUTHORS +.An -nosplit +The driver and this manual page was written by +.An Luiz Otavio O Souza Aq Mt loos@FreeBSD.org . |