nrf-saadc.h File Reference

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Macros
#define	NRF_SAADC_AIN0   0
#define	NRF_SAADC_AIN1   1
#define	NRF_SAADC_AIN2   2
#define	NRF_SAADC_AIN3   3
#define	NRF_SAADC_AIN4   4
#define	NRF_SAADC_AIN5   5
#define	NRF_SAADC_AIN6   6
#define	NRF_SAADC_AIN7   7
#define	NRF_SAADC_AIN8   8
#define	NRF_SAADC_AIN9   9
#define	NRF_SAADC_AIN10   10
#define	NRF_SAADC_AIN11   11
#define	NRF_SAADC_AIN12   12
#define	NRF_SAADC_AIN13   13
#define	NRF_SAADC_GND   (NRF_SAADC_AIN_VDD_SHIM_OFFSET - 1)
	Short ADC negative input to ground.
#define	NRF_SAADC_AIN_VDD_SHIM_OFFSET   128
#define	NRF_SAADC_VDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 0)
#define	NRF_SAADC_VDDDIV2   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 1)
#define	NRF_SAADC_AVDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 2)
#define	NRF_SAADC_DVDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 3)
#define	NRF_SAADC_VDDHDIV5   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 4)
#define	NRF_SAADC_VDDL   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 5)
#define	NRF_SAADC_DECB   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 6)
#define	NRF_SAADC_VSS   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 7)
#define	NRF_SAADC_VDDAO3V0   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 8)
#define	NRF_SAADC_VDDAO1V8   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 9)
#define	NRF_SAADC_VDDAO0V8   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 10)
#define	NRF_SAADC_VDDRF   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 11)
#define	NRF_SAADC_VBAT   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 12)
#define	NRF_SAADC_AIN_DISABLED   255 /* UINT8_MAX */

Macro Definition Documentation

NRF_SAADC_AIN0

#define NRF_SAADC_AIN0   0

NRF_SAADC_AIN1

#define NRF_SAADC_AIN1   1

NRF_SAADC_AIN10

#define NRF_SAADC_AIN10   10

NRF_SAADC_AIN11

#define NRF_SAADC_AIN11   11

NRF_SAADC_AIN12

#define NRF_SAADC_AIN12   12

NRF_SAADC_AIN13

#define NRF_SAADC_AIN13   13

NRF_SAADC_AIN2

#define NRF_SAADC_AIN2   2

NRF_SAADC_AIN3

#define NRF_SAADC_AIN3   3

NRF_SAADC_AIN4

#define NRF_SAADC_AIN4   4

NRF_SAADC_AIN5

#define NRF_SAADC_AIN5   5

NRF_SAADC_AIN6

#define NRF_SAADC_AIN6   6

NRF_SAADC_AIN7

#define NRF_SAADC_AIN7   7

NRF_SAADC_AIN8

#define NRF_SAADC_AIN8   8

NRF_SAADC_AIN9

#define NRF_SAADC_AIN9   9

NRF_SAADC_AIN_DISABLED

#define NRF_SAADC_AIN_DISABLED   255 /* UINT8_MAX */

NRF_SAADC_AIN_VDD_SHIM_OFFSET

#define NRF_SAADC_AIN_VDD_SHIM_OFFSET   128

NRF_SAADC_AVDD

#define NRF_SAADC_AVDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 2)

NRF_SAADC_DECB

#define NRF_SAADC_DECB   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 6)

NRF_SAADC_DVDD

#define NRF_SAADC_DVDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 3)

NRF_SAADC_GND

#define NRF_SAADC_GND   (NRF_SAADC_AIN_VDD_SHIM_OFFSET - 1)

Short ADC negative input to ground.

The nRF SAADC hardware only supports differential readings. The nRF SAADC SE (single ended) mode is differential with the negative input shorted to GND (ground). To use the nRF SAADC SE mode, set the negative input to NRF_SAADC_GND:

zephyr,input-positive = <NRF_SAADC_AIN3>;
zephyr,input-negative = <NRF_SAADC_GND>;

The nRF SAADC driver also supports using the nRF SAADC SE mode in emulated "single-ended" mode, as defined by zephyr. In this mode, negative readings will be clamped to 0 by software to emulate the behavior of an ADC in "single-ended" mode, as defined by zephyr. To do this, only define the positive input:

zephyr,input-positive = <NRF_SAADC_AIN3>;

NRF_SAADC_VBAT

#define NRF_SAADC_VBAT   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 12)

NRF_SAADC_VDD

#define NRF_SAADC_VDD   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 0)

NRF_SAADC_VDDAO0V8

#define NRF_SAADC_VDDAO0V8   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 10)

NRF_SAADC_VDDAO1V8

#define NRF_SAADC_VDDAO1V8   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 9)

NRF_SAADC_VDDAO3V0

#define NRF_SAADC_VDDAO3V0   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 8)

NRF_SAADC_VDDDIV2

#define NRF_SAADC_VDDDIV2   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 1)

NRF_SAADC_VDDHDIV5

#define NRF_SAADC_VDDHDIV5   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 4)

NRF_SAADC_VDDL

#define NRF_SAADC_VDDL   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 5)

NRF_SAADC_VDDRF

#define NRF_SAADC_VDDRF   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 11)

NRF_SAADC_VSS

#define NRF_SAADC_VSS   (NRF_SAADC_AIN_VDD_SHIM_OFFSET + 7)