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/*
* Copyright (c) 2022 Arm Limited.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(ETHOSU)
#include "FreeRTOS.h"
#include "semphr.h"
#include <ethosu_driver.h>
#include <stdio.h>
extern "C" {
void *ethosu_mutex_create(void) {
return xSemaphoreCreateMutex();
}
int ethosu_mutex_lock(void *mutex) {
SemaphoreHandle_t handle = reinterpret_cast<SemaphoreHandle_t>(mutex);
if (xSemaphoreTake(handle, portMAX_DELAY) != pdTRUE) {
printf("Error: Failed to lock mutex.\n");
return -1;
}
return 0;
}
int ethosu_mutex_unlock(void *mutex) {
SemaphoreHandle_t handle = reinterpret_cast<SemaphoreHandle_t>(mutex);
if (xSemaphoreGive(handle) != pdTRUE) {
printf("Error: Failed to unlock mutex.\n");
return -1;
}
return 0;
}
void *ethosu_semaphore_create(void) {
return xSemaphoreCreateBinary();
}
int ethosu_semaphore_take(void *sem) {
SemaphoreHandle_t handle = reinterpret_cast<SemaphoreHandle_t>(sem);
if (xSemaphoreTake(handle, portMAX_DELAY) != pdTRUE) {
printf("Error: Failed to take semaphore.\n");
return -1;
}
return 0;
}
int ethosu_semaphore_give(void *sem) {
SemaphoreHandle_t handle = reinterpret_cast<SemaphoreHandle_t>(sem);
if (xPortIsInsideInterrupt()) {
if (xSemaphoreGiveFromISR(handle, NULL) != pdTRUE) {
printf("Error: Failed to give semaphore from ISR.\n");
return -1;
}
} else {
/* A FreeRTOS binary semaphore is fundamentally a queue that can only hold one item. If the queue is full,
* xSemaphoreGive will return a pdFALSE value. Ignoring the return value in here, as a semaphore give failure
* does not affect the application correctness. */
if (xSemaphoreGive(handle) != pdTRUE) {
// do nothing
}
}
return 0;
}
}
#endif
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