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nrfx 4.5.0
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nrfx 4.5.0
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The sample demonstrates an advanced functionality of the nrfx_saadc driver operating at its peak performance.
The sample supports the following development kits:
| Board | Support |
|---|---|
| nrf52dk_nrf52832 | No |
| nrf52833dk_nrf52833 | Yes |
| nrf52840dk_nrf52840 | Yes |
| nrf5340dk_nrf5340 | No |
| nrf54l15dk_nrf54l15 | Yes |
| nrf9160dk_nrf9160 | Yes |
Application initializes the nrfx_saadc driver and starts operating in the non-blocking mode. Sampling is performed at the highest supported frequency. In the sample m_single_channel is configured, and the SAADC driver is set to the advanced mode. To achieve the maximum performance, do the following:
MAX_SAADC_SAMPLE_FREQUENCY. You can do this by setting up endpoints of the channel m_gppi_channels [ gppi_channels_purpose_t::SAADC_SAMPLING ] to trigger the SAADC sample task ( nrf_saadc_task_t::NRF_SAADC_TASK_SAMPLE ) on the TIMER COMPARE event.m_gppi_channels [ gppi_channels_purpose_t::SAADC_START_ON_END ] to trigger SAADC task start ( nrf_saadc_task_t::NRF_SAADC_TASK_START ) on the SAADC event end ( nrf_saadc_event_t::NRF_SAADC_EVENT_END ).nrfx_saadc_offset_calibrate triggers calibration in a non-blocking manner. Then, sampling is initiated at NRFX_SAADC_EVT_CALIBRATEDONE event in saadc_handler() by calling nrfx_saadc_mode_trigger() function. Consecutive sample tasks are triggered by the external timer at the sample rate specified in SAADC_SAMPLE_FREQUENCY symbol.
In the example there is GPPI channel configured to test the functionality of SAADC. The endpoints are setup up in a way that connects the NRF_SAADC_EVENT_RESULTDONE event with the GPIOTE task toggling the OUT_GPIO_PIN pin.
For more information, see SAADC driver - nrfx documentation.
To run the sample correctly, connect pins as follows:
LOOPBACK_PIN_1A with LOOPBACK_PIN_1B.To run this sample, build it for the appropriate board and then flash it as per instructions in Building and running section.
You should see the following output:
1.12.0