197 lines
6.3 KiB
C
197 lines
6.3 KiB
C
/**
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* Copyright (c) 2014 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/** @file
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* @defgroup nrf_adc_example main.c
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* @{
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* @ingroup nrf_adc_example
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* @brief ADC Example Application main file.
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*
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* This file contains the source code for a sample application using ADC.
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*
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* @image html example_board_setup_a.jpg "Use board setup A for this example."
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "nrf.h"
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#include "nrf_drv_saadc.h"
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#include "nrf_drv_ppi.h"
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#include "nrf_drv_timer.h"
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#include "boards.h"
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#include "app_error.h"
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#include "nrf_delay.h"
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#include "app_util_platform.h"
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#include "nrf_pwr_mgmt.h"
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#include "nrf_log.h"
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#include "nrf_log_ctrl.h"
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#include "nrf_log_default_backends.h"
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#define SAMPLES_IN_BUFFER 5
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volatile uint8_t state = 1;
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static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0);
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static nrf_saadc_value_t m_buffer_pool[2][SAMPLES_IN_BUFFER];
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static nrf_ppi_channel_t m_ppi_channel;
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static uint32_t m_adc_evt_counter;
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void timer_handler(nrf_timer_event_t event_type, void * p_context)
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{
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}
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void saadc_sampling_event_init(void)
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{
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ret_code_t err_code;
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err_code = nrf_drv_ppi_init();
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APP_ERROR_CHECK(err_code);
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nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
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timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
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err_code = nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler);
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APP_ERROR_CHECK(err_code);
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/* setup m_timer for compare event every 400ms */
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uint32_t ticks = nrf_drv_timer_ms_to_ticks(&m_timer, 400);
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nrf_drv_timer_extended_compare(&m_timer,
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NRF_TIMER_CC_CHANNEL0,
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ticks,
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NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
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false);
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nrf_drv_timer_enable(&m_timer);
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uint32_t timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&m_timer,
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NRF_TIMER_CC_CHANNEL0);
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uint32_t saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
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/* setup ppi channel so that timer compare event is triggering sample task in SAADC */
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err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
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APP_ERROR_CHECK(err_code);
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err_code = nrf_drv_ppi_channel_assign(m_ppi_channel,
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timer_compare_event_addr,
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saadc_sample_task_addr);
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APP_ERROR_CHECK(err_code);
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}
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void saadc_sampling_event_enable(void)
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{
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ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
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APP_ERROR_CHECK(err_code);
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}
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void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
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{
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if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
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{
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ret_code_t err_code;
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err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
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APP_ERROR_CHECK(err_code);
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int i;
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NRF_LOG_INFO("ADC event number: %d", (int)m_adc_evt_counter);
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for (i = 0; i < SAMPLES_IN_BUFFER; i++)
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{
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NRF_LOG_INFO("%d", p_event->data.done.p_buffer[i]);
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}
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m_adc_evt_counter++;
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}
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}
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void saadc_init(void)
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{
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ret_code_t err_code;
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nrf_saadc_channel_config_t channel_config =
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NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);
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err_code = nrf_drv_saadc_init(NULL, saadc_callback);
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APP_ERROR_CHECK(err_code);
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err_code = nrf_drv_saadc_channel_init(0, &channel_config);
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APP_ERROR_CHECK(err_code);
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err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
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APP_ERROR_CHECK(err_code);
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err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
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APP_ERROR_CHECK(err_code);
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}
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/**
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* @brief Function for main application entry.
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*/
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int main(void)
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{
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uint32_t err_code = NRF_LOG_INIT(NULL);
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APP_ERROR_CHECK(err_code);
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NRF_LOG_DEFAULT_BACKENDS_INIT();
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ret_code_t ret_code = nrf_pwr_mgmt_init();
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APP_ERROR_CHECK(ret_code);
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saadc_init();
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saadc_sampling_event_init();
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saadc_sampling_event_enable();
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NRF_LOG_INFO("SAADC HAL simple example started.");
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while (1)
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{
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nrf_pwr_mgmt_run();
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NRF_LOG_FLUSH();
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}
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}
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/** @} */
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