/* * Copyright (c) 2015 Nordic Semiconductor ASA * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this list * of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA * integrated circuit in a product or a software update for such product, must reproduce * the above copyright notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be * used to endorse or promote products derived from this software without specific prior * written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary or object form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "nrf_drv_adc.h" #include "nrf_drv_common.h" #include "nrf_assert.h" #include "app_util_platform.h" #include "app_util.h" typedef struct { nrf_drv_adc_event_handler_t event_handler; nrf_drv_adc_channel_t * p_head; nrf_drv_adc_channel_t * p_current_conv; nrf_adc_value_t * p_buffer; uint8_t size; uint8_t idx; nrf_drv_state_t state; } adc_cb_t; static adc_cb_t m_cb; static const nrf_drv_adc_config_t m_default_config = NRF_DRV_ADC_DEFAULT_CONFIG; ret_code_t nrf_drv_adc_init(nrf_drv_adc_config_t const * p_config, nrf_drv_adc_event_handler_t event_handler) { if (m_cb.state != NRF_DRV_STATE_UNINITIALIZED) { return NRF_ERROR_INVALID_STATE; } nrf_adc_event_clear(NRF_ADC_EVENT_END); if (event_handler) { if (!p_config) { p_config = (nrf_drv_adc_config_t *)&m_default_config; } nrf_drv_common_irq_enable(ADC_IRQn, p_config->interrupt_priority); } m_cb.event_handler = event_handler; m_cb.state = NRF_DRV_STATE_INITIALIZED; return NRF_SUCCESS; } void nrf_drv_adc_uninit(void) { m_cb.p_head = NULL; nrf_drv_common_irq_disable(ADC_IRQn); nrf_adc_int_disable(NRF_ADC_INT_END_MASK); nrf_adc_task_trigger(NRF_ADC_TASK_STOP); m_cb.state = NRF_DRV_STATE_UNINITIALIZED; } void nrf_drv_adc_channel_enable(nrf_drv_adc_channel_t * const p_channel) { ASSERT(mp_state == NRF_DRV_STATE_INITIALIZED); ASSERT(!is_address_from_stack(p_channel)); p_channel->p_next = NULL; if (m_cb.p_head == NULL) { m_cb.p_head = p_channel; } else { nrf_drv_adc_channel_t * p_curr_channel = m_cb.p_head; while (p_curr_channel->p_next != NULL) { ASSERT(p_channel != p_curr_channel); p_curr_channel = p_curr_channel->p_next; } p_curr_channel->p_next = p_channel; } } void nrf_drv_adc_channel_disable(nrf_drv_adc_channel_t * const p_channel) { ASSERT(mp_state == NRF_DRV_STATE_INITIALIZED); ASSERT(m_cb.p_head); nrf_drv_adc_channel_t * p_curr_channel = m_cb.p_head; nrf_drv_adc_channel_t * p_prev_channel = NULL; while(p_curr_channel != p_channel) { p_prev_channel = p_curr_channel; p_curr_channel = p_curr_channel->p_next; ASSERT(p_curr_channel == NULL); } if (p_prev_channel) { p_prev_channel->p_next = p_curr_channel->p_next; } else { m_cb.p_head = p_curr_channel->p_next; } } void nrf_drv_adc_sample(void) { ASSERT(mp_state != NRF_DRV_STATE_UNINITIALIZED); ASSERT(!nrf_adc_is_busy()); nrf_adc_start(); } ret_code_t nrf_drv_adc_sample_convert(nrf_drv_adc_channel_t const * const p_channel, nrf_adc_value_t * p_value) { ASSERT(mp_state != NRF_DRV_STATE_UNINITIALIZED); if(m_cb.state == NRF_DRV_STATE_POWERED_ON) { return NRF_ERROR_BUSY; } else { m_cb.state = NRF_DRV_STATE_POWERED_ON; nrf_adc_config_set(p_channel->config.data); nrf_adc_enable(); nrf_adc_int_disable(NRF_ADC_INT_END_MASK); nrf_adc_start(); if (p_value) { while(!nrf_adc_event_check(NRF_ADC_EVENT_END)) {} nrf_adc_event_clear(NRF_ADC_EVENT_END); *p_value = (nrf_adc_value_t)nrf_adc_result_get(); nrf_adc_disable(); m_cb.state = NRF_DRV_STATE_INITIALIZED; } else { ASSERT(m_cb.event_handler); m_cb.p_buffer = NULL; nrf_adc_int_enable(NRF_ADC_INT_END_MASK); } return NRF_SUCCESS; } } static bool adc_sample_process() { nrf_adc_event_clear(NRF_ADC_EVENT_END); nrf_adc_disable(); m_cb.p_buffer[m_cb.idx] = (nrf_adc_value_t)nrf_adc_result_get(); m_cb.idx++; if (m_cb.idx < m_cb.size) { bool task_trigger = false; if (m_cb.p_current_conv->p_next == NULL) { m_cb.p_current_conv = m_cb.p_head; } else { m_cb.p_current_conv = m_cb.p_current_conv->p_next; task_trigger = true; } nrf_adc_config_set(m_cb.p_current_conv->config.data); nrf_adc_enable(); if (task_trigger) { //nrf_adc_start(); nrf_adc_task_trigger(NRF_ADC_TASK_START); } return false; } else { return true; } } ret_code_t nrf_drv_adc_buffer_convert(nrf_adc_value_t * buffer, uint16_t size) { ASSERT(mp_state != NRF_DRV_STATE_UNINITIALIZED); if(m_cb.state == NRF_DRV_STATE_POWERED_ON) { return NRF_ERROR_BUSY; } else { m_cb.state = NRF_DRV_STATE_POWERED_ON; m_cb.p_current_conv = m_cb.p_head; m_cb.size = size; m_cb.idx = 0; m_cb.p_buffer = buffer; nrf_adc_config_set(m_cb.p_current_conv->config.data); nrf_adc_event_clear(NRF_ADC_EVENT_END); nrf_adc_enable(); if (m_cb.event_handler) { nrf_adc_int_enable(NRF_ADC_INT_END_MASK); } else { while(1) { while(!nrf_adc_event_check(NRF_ADC_EVENT_END)){} if (adc_sample_process()) { m_cb.state = NRF_DRV_STATE_INITIALIZED; break; } } } return NRF_SUCCESS; } } bool nrf_drv_adc_is_busy(void) { ASSERT(mp_state != NRF_DRV_STATE_UNINITIALIZED); return (m_cb.state == NRF_DRV_STATE_POWERED_ON) ? true : false; } void ADC_IRQHandler(void) { if (m_cb.p_buffer == NULL) { nrf_adc_event_clear(NRF_ADC_EVENT_END); nrf_adc_int_disable(NRF_ADC_INT_END_MASK); nrf_adc_disable(); nrf_drv_adc_evt_t evt; evt.type = NRF_DRV_ADC_EVT_SAMPLE; evt.data.sample.sample = (nrf_adc_value_t)nrf_adc_result_get(); m_cb.state = NRF_DRV_STATE_INITIALIZED; m_cb.event_handler(&evt); } else if (adc_sample_process()) { nrf_adc_int_disable(NRF_ADC_INT_END_MASK); nrf_drv_adc_evt_t evt; evt.type = NRF_DRV_ADC_EVT_DONE; evt.data.done.p_buffer = m_cb.p_buffer; evt.data.done.size = m_cb.size; m_cb.state = NRF_DRV_STATE_INITIALIZED; m_cb.event_handler(&evt); } }