初始版本

external/infineon/pal/nrf5x/pal_os_lock.c

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+/**
+* MIT License
+*
+* Copyright (c) 2018 Infineon Technologies AG
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE
+*
+*
+* \file pal_os_lock.c
+*
+* \brief   This file implements the platform abstraction layer APIs for os locks (e.g. semaphore).
+*
+* \addtogroup  grPAL
+* @{
+*/
+
+#include "optiga/pal/pal_os_lock.h"
+#include "nrf_atomic.h"
+#include "nrf_pwr_mgmt.h"
+
+/**
+ * @brief PAL OS lock structure. Might be extended if needed
+ */
+typedef struct pal_os_lock
+{
+    nrf_atomic_flag_t lock;
+} pal_os_lock_t;
+
+static volatile pal_os_lock_t pal_os_lock = {.lock = 0};
+
+pal_status_t pal_os_lock_acquire(void)
+{
+    // wait until previous value was false, this indicates the lock was free and we own it now.
+    while(nrf_atomic_flag_set_fetch(&pal_os_lock.lock)) {
+        nrf_pwr_mgmt_run();
+    }
+
+    return PAL_STATUS_SUCCESS;
+}
+
+void pal_os_lock_release(void)
+{
+    (void)nrf_atomic_flag_clear(&pal_os_lock.lock);
+}
+
+/**
+* @}
+*/