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download PDF document: ti_adc.4.pdf

TI_ADC(4) FreeBSD Kernel Interfaces Manual TI_ADC(4)
NAME ti_adc - TI AM3XXX analog to digital converter driver
SYNOPSIS device ti_adc
DESCRIPTION The ti_adc driver provides access to the AIN (analog inputs) on am3xxx SoCs.
It provides raw readings of the converted values for each analog inputs.
The access to ti_adc data is made via the sysctl(8) interface:
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
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.
Global settings: Settings per input:
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.
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.
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.
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).
SEE ALSO sysctl(8)
HISTORY The ti_adc driver first appeared in FreeBSD 10.1.
AUTHORS The driver and this manual page was written by Luiz Otavio O Souza <loos@FreeBSD.org>.
FreeBSD 14.0-RELEASE-p11 June 1, 2014 FreeBSD 14.0-RELEASE-p11