| /* Copyright (c) 2017, 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 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. |
| * |
| * 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. |
| * |
| */ |
| |
| /** |
| * @file |
| * This file implements critical sections used with requests by 802.15.4 driver. |
| * |
| */ |
| |
| #include "nrf_drv_radio802154_critical_section.h" |
| |
| #include <assert.h> |
| #include <stdint.h> |
| |
| #include "nrf_drv_radio802154_debug.h" |
| #include "nrf_drv_radio802154_fsm.h" |
| #include "hal/nrf_radio.h" |
| #include "raal/nrf_raal_api.h" |
| |
| #include <cmsis/core_cmFunc.h> |
| |
| #if RAAL_SOFTDEVICE |
| // When Softdevice is selected as arbiter critical sections should not be nested. |
| #define PREVENT_NESTED_CRIT_SECTIONS 1 |
| #endif // RAAL_SOFTDEVICE |
| |
| #if PREVENT_NESTED_CRIT_SECTIONS |
| /// Flag indicating if the driver entered critical section. |
| static volatile bool m_in_critical_section; |
| #endif // PREVENT_NESTED_CRIT_SECTIONS |
| |
| void nrf_drv_radio802154_critical_section_enter(void) |
| { |
| nrf_drv_radio802154_log(EVENT_TRACE_ENTER, FUNCTION_CRIT_SECT_ENTER); |
| radio_state_t state; |
| |
| #if PREVENT_NESTED_CRIT_SECTIONS |
| __disable_irq(); |
| __DSB(); |
| __ISB(); |
| |
| assert(!m_in_critical_section); |
| m_in_critical_section = true; |
| #endif // PREVENT_NESTED_CRIT_SECTIONS |
| |
| nrf_raal_critical_section_enter(); |
| |
| state = nrf_drv_radio802154_fsm_state_get(); |
| |
| if (state != RADIO_STATE_WAITING_TIMESLOT && |
| state != RADIO_STATE_SLEEP) |
| { |
| NVIC_DisableIRQ(RADIO_IRQn); |
| #if !RAAL_SOFTDEVICE |
| __DSB(); |
| __ISB(); |
| #endif // !RAAL_SOFTDEVICE |
| } |
| |
| #if PREVENT_NESTED_CRIT_SECTIONS |
| __enable_irq(); |
| #endif // PREVENT_NESTED_CRIT_SECTIONS |
| |
| nrf_drv_radio802154_log(EVENT_TRACE_EXIT, FUNCTION_CRIT_SECT_ENTER); |
| } |
| |
| void nrf_drv_radio802154_critical_section_exit(void) |
| { |
| nrf_drv_radio802154_log(EVENT_TRACE_ENTER, FUNCTION_CRIT_SECT_EXIT); |
| |
| #if PREVENT_NESTED_CRIT_SECTIONS |
| assert(m_in_critical_section); |
| m_in_critical_section = false; |
| #endif // PREVENT_NESTED_CRIT_SECTIONS |
| |
| radio_state_t state; |
| |
| // RAAL critical section shall be exited before RADIO IRQ handler is enabled. In other case |
| // RADIO IRQ handler may be called out of timeslot. |
| nrf_raal_critical_section_exit(); |
| |
| state = nrf_drv_radio802154_fsm_state_get(); |
| |
| if (state != RADIO_STATE_WAITING_TIMESLOT && |
| state != RADIO_STATE_SLEEP) |
| { |
| NVIC_EnableIRQ(RADIO_IRQn); |
| } |
| |
| nrf_drv_radio802154_log(EVENT_TRACE_EXIT, FUNCTION_CRIT_SECT_EXIT); |
| } |
| |