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TI_ADC(4) arm 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: 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 maxi- mum of ~2.4Mhz for the ADC clock and ~10Khz for the default setting (clockdiv = 2400). Settings per input: dev.ti_adc.0.ain.%d.enable Enable the conversion for the input. Each input should be individually enabled be- fore 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 configura- tion 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 ports 15.1 June 1, 2014 TI_ADC(4)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS
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