1# SAADC simple non-blocking {#saadc_simple_non_blocking}
2
3The sample demonstrates a simple functionality of the nrfx_saadc driver operating in the non-blocking mode.
4
5## Requirements
6
7The sample supports the following development kits:
8
9| **Board**           | **Support** |
10|---------------------|:-----------:|
11| nrf52dk_nrf52832    |     Yes     |
12| nrf52833dk_nrf52833 |     Yes     |
13| nrf52840dk_nrf52840 |     Yes     |
14| nrf5340dk_nrf5340   |     Yes     |
15| nrf9160dk_nrf9160   |     Yes     |
16
17## Overview
18
19Application initializes the nrfx_saadc driver and starts operating in the non-blocking mode.
20Program works as a simple state machine and starts in state @p m_current_state == STATE_SINGLE_CONFIG.
21In this state the following configurations apply:
22- STATE_SINGLE_CONFIG - SAADC driver is configured to work with only one channel ( @p m_single_channel ) in the blocking mode.
23  Afterward, @p m_current_state changes to STATE_SINGLE_SAMPLING.
24- STATE_SINGLE_SAMPLING - sampling on a single channel ( @p m_single_channel ) is performed specified number of times ( @p SAMPLING_ITERATIONS ), and then @p m_current_state changes to STATE_MULTIPLE_CONFIG.
25- STATE_MULTIPLE_CONFIG - SAADC driver is configured to work with multiple channels ( @p m_multiple_channels ) in the blocking mode.
26  Afterward, @p m_current_state changes to STATE_MULTIPLE_SAMPLING.
27- STATE_MULTIPLE_SAMPLING - sampling on multiple channels ( @p m_multiple_channels ) is performed specified number of times ( @p SAMPLING_ITERATIONS ).
28
29Before every sampling a calibration in the non-blocking manner is performed.
30Sampling is then invoked by the @p nrfx_saadc_mode_trigger() function.
31
32In the sample there are GPIOTE tasks configured to toggle specified ( @p m_out_pins ) loopback pins.
33Those tasks are triggered between successive samplings to verify the functionality of the SAADC on the nonconstant analog signal.
34
35> For more information, see **SAADC driver - nrfx documentation**.
36
37## Wiring
38
39To run the sample correctly, connect pins as follows:
40* `LOOPBACK_PIN_1A` with `LOOPBACK_PIN_1B`,
41* `LOOPBACK_PIN_2A` with `LOOPBACK_PIN_2B`,
42* `LOOPBACK_PIN_3A` with `LOOPBACK_PIN_3B`.
43
44## Building and running
45
46To run this sample, build it for the appropriate board and then flash it as per instructions in [Building and running](@ref building_and_running) section.
47
48## Sample output
49
50You should see the following output:
51
52```
53- "Starting nrfx_saadc simple non-blocking example."
54- "Single channel SAADC test."
55- "SAADC event: CALIBRATEDONE"
56- "SAADC event: DONE"
57- "[Sample 0] value == ([0-9]{3})"
58- "SAADC event: CALIBRATEDONE"
59- "SAADC event: DONE"
60- "[Sample 0] value == -?[0-9]"
61- "SAADC event: CALIBRATEDONE"
62- "SAADC event: DONE"
63- "[Sample 0] value == ([0-9]{3})"
64- "SAADC event: CALIBRATEDONE"
65- "SAADC event: DONE"
66- "[Sample 0] value == -?[0-9]"
67- "SAADC event: CALIBRATEDONE"
68- "SAADC event: DONE"
69- "[Sample 0] value == ([0-9]{3})"
70- "SAADC event: CALIBRATEDONE"
71- "SAADC event: DONE"
72- "[Sample 0] value == -?[0-9]"
73- "SAADC event: CALIBRATEDONE"
74- "SAADC event: DONE"
75- "[Sample 0] value == ([0-9]{3})"
76- "SAADC event: CALIBRATEDONE"
77- "SAADC event: DONE"
78- "[Sample 0] value == -?[0-9]"
79- "Multiple channels SAADC test."
80- "SAADC event: CALIBRATEDONE"
81- "SAADC event: DONE"
82- "[Sample 0] value == ([0-9]{3})"
83- "[Sample 1] value == ([0-9]{3})"
84- "[Sample 2] value == ([0-9]{3})"
85- "SAADC event: CALIBRATEDONE"
86- "SAADC event: DONE"
87- "[Sample 0] value == -?[0-9]"
88- "[Sample 1] value == -?[0-9]"
89- "[Sample 2] value == -?[0-9]"
90- "SAADC event: CALIBRATEDONE"
91- "SAADC event: DONE"
92- "[Sample 0] value == ([0-9]{3})"
93- "[Sample 1] value == ([0-9]{3})"
94- "[Sample 2] value == ([0-9]{3})"
95- "SAADC event: CALIBRATEDONE"
96- "SAADC event: DONE"
97- "[Sample 0] value == -?[0-9]"
98- "[Sample 1] value == -?[0-9]"
99- "[Sample 2] value == -?[0-9]"
100- "SAADC event: CALIBRATEDONE"
101- "SAADC event: DONE"
102- "[Sample 0] value == ([0-9]{3})"
103- "[Sample 1] value == ([0-9]{3})"
104- "[Sample 2] value == ([0-9]{3})"
105- "SAADC event: CALIBRATEDONE"
106- "SAADC event: DONE"
107- "[Sample 0] value == -?[0-9]"
108- "[Sample 1] value == -?[0-9]"
109- "[Sample 2] value == -?[0-9]"
110- "SAADC event: CALIBRATEDONE"
111- "SAADC event: DONE"
112- "[Sample 0] value == ([0-9]{3})"
113- "[Sample 1] value == ([0-9]{3})"
114- "[Sample 2] value == ([0-9]{3})"
115- "SAADC event: CALIBRATEDONE"
116- "SAADC event: DONE"
117- "[Sample 0] value == -?[0-9]"
118- "[Sample 1] value == -?[0-9]"
119- "[Sample 2] value == -?[0-9]"
120```
121
122[//]: #
123[Building and running]: <../../../README.md#building-and-running>
124