1# SAADC advanced blocking {#saadc_advanced_blocking}
2
3The sample demonstrates an advanced functionality of the nrfx_saadc driver operating in the 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 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 a 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 blocking manner is performed. Sampling is then invoked
30by the @p nrfx_saadc_mode_trigger() function.
31
32In the sample there are GPIOTE tasks configured to toggle the specified ( @p m_out_pins ) loopback pins. Those tasks are triggered between successive samplings to verify the functionality of the SAADC on the nonconstant analog signal.
33
34> For more information, see **SAADC driver - nrfx documentation**.
35
36## Wiring
37
38To run the sample correctly, connect pins as follows:
39* `LOOPBACK_PIN_1A` with `LOOPBACK_PIN_1B`.
40
41## Building and running
42
43To 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.
44
45## Sample output
46
47You should see the following output:
48
49```
50- "Starting nrfx_saadc advanced blocking example."
51- "Calibration in the blocking manner finished successfully."
52- "Sampling 1 / 5"
53- ".Sample 0. value == ([0-9]{3})"
54- ".Sample 1. value == ([0-9]{3})"
55- "Calibration in the blocking manner finished successfully."
56- "Sampling 2 / 5"
57- ".Sample 0. value == -?[0-9]"
58- ".Sample 1. value == -?[0-9]"
59- "Calibration in the blocking manner finished successfully."
60- "Sampling 3 / 5"
61- ".Sample 0. value == ([0-9]{3})"
62- ".Sample 1. value == ([0-9]{3})"
63- "Calibration in the blocking manner finished successfully."
64- "Sampling 4 / 5"
65- ".Sample 0. value == -?[0-9]"
66- ".Sample 1. value == -?[0-9]"
67- "Calibration in the blocking manner finished successfully."
68- "Sampling 5 / 5"
69- ".Sample 0. value == ([0-9]{3})"
70- ".Sample 1. value == ([0-9]{3})"
71```
72[//]: #
73[Building and running]: <../../../README.md#building-and-running>
74