| /** |
| * Copyright (c) 2016 - 2018, 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 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 the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * 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 <nrfx.h> |
| |
| #if NRFX_CHECK(NRFX_RNG_ENABLED) |
| |
| #include <nrfx_rng.h> |
| |
| #define NRFX_LOG_MODULE RNG |
| #include <nrfx_log.h> |
| |
| /** |
| * @brief Internal state of RNG driver. |
| */ |
| static nrfx_drv_state_t m_rng_state; |
| |
| /** |
| * @brief Pointer to handler calling from interrupt routine. |
| */ |
| static nrfx_rng_evt_handler_t m_rng_hndl; |
| |
| nrfx_err_t nrfx_rng_init(nrfx_rng_config_t const * p_config, nrfx_rng_evt_handler_t handler) |
| { |
| NRFX_ASSERT(p_config); |
| NRFX_ASSERT(handler); |
| if (m_rng_state != NRFX_DRV_STATE_UNINITIALIZED) |
| { |
| return NRFX_ERROR_ALREADY_INITIALIZED; |
| } |
| |
| m_rng_hndl = handler; |
| |
| if (p_config->error_correction) |
| { |
| nrf_rng_error_correction_enable(); |
| } |
| nrf_rng_shorts_disable(NRF_RNG_SHORT_VALRDY_STOP_MASK); |
| NRFX_IRQ_PRIORITY_SET(RNG_IRQn, p_config->interrupt_priority); |
| NRFX_IRQ_ENABLE(RNG_IRQn); |
| |
| m_rng_state = NRFX_DRV_STATE_INITIALIZED; |
| |
| return NRFX_SUCCESS; |
| } |
| |
| void nrfx_rng_start(void) |
| { |
| NRFX_ASSERT(m_rng_state == NRFX_DRV_STATE_INITIALIZED); |
| nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY); |
| nrf_rng_int_enable(NRF_RNG_INT_VALRDY_MASK); |
| nrf_rng_task_trigger(NRF_RNG_TASK_START); |
| } |
| |
| void nrfx_rng_stop(void) |
| { |
| NRFX_ASSERT(m_rng_state == NRFX_DRV_STATE_INITIALIZED); |
| nrf_rng_int_disable(NRF_RNG_INT_VALRDY_MASK); |
| nrf_rng_task_trigger(NRF_RNG_TASK_STOP); |
| } |
| |
| void nrfx_rng_uninit(void) |
| { |
| NRFX_ASSERT(m_rng_state == NRFX_DRV_STATE_INITIALIZED); |
| |
| nrf_rng_int_disable(NRF_RNG_INT_VALRDY_MASK); |
| nrf_rng_task_trigger(NRF_RNG_TASK_STOP); |
| NRFX_IRQ_DISABLE(RNG_IRQn); |
| |
| m_rng_state = NRFX_DRV_STATE_UNINITIALIZED; |
| NRFX_LOG_INFO("Uninitialized."); |
| } |
| |
| void nrfx_rng_irq_handler(void) |
| { |
| nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY); |
| |
| uint8_t rng_value = nrf_rng_random_value_get(); |
| |
| m_rng_hndl(rng_value); |
| |
| NRFX_LOG_DEBUG("Event: NRF_RNG_EVENT_VALRDY."); |
| } |
| |
| #endif // NRFX_CHECK(NRFX_RNG_ENABLED) |