Import Mbed OS hard-float snapshot

TESTS/mbed_hal/sleep/sleep_test_utils.h

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+/* mbed Microcontroller Library
+ * Copyright (c) 2017 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
+ *
+ *     http://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.
+ */
+
+/**
+ * @addtogroup hal_sleep
+ * @{
+ * @defgroup hal_sleep_test_util Tests
+ * Tests of the sleep HAL.
+ * @{
+ */
+
+#ifndef MBED_SLEEP_TEST_UTILS_H
+#define MBED_SLEEP_TEST_UTILS_H
+
+#include "hal/ticker_api.h"
+#include "hal/us_ticker_api.h"
+#include "hal/lp_ticker_api.h"
+
+/* To prevent a loss of Greentea data, the serial buffers have to be flushed
+ * before the UART peripheral shutdown. The UART shutdown happens when the
+ * device is entering the deepsleep mode or performing a reset.
+ *
+ * With the current API, it is not possible to check if the hardware buffers
+ * are empty. However, it is possible to determine the time required for the
+ * buffers to flush.
+ *
+ * Assuming the biggest Tx FIFO of 128 bytes (as for CY8CPROTO_062_4343W)
+ * and a default UART config (9600, 8N1), flushing the Tx FIFO wold take:
+ * (1 start_bit + 8 data_bits + 1 stop_bit) * 128 * 1000 / 9600 = 133.3 ms.
+ * To be on the safe side, set the wait time to 150 ms.
+ */
+#define SERIAL_FLUSH_TIME_MS 150
+
+#define US_PER_S 1000000
+
+unsigned int ticks_to_us(unsigned int ticks, unsigned int freq)
+{
+    return (unsigned int)((unsigned long long) ticks * US_PER_S / freq);
+}
+
+unsigned int us_to_ticks(unsigned int us, unsigned int freq)
+{
+    return (unsigned int)((unsigned long long) us * freq / US_PER_S);
+}
+
+unsigned int overflow_protect(unsigned int timestamp, unsigned int ticker_width)
+{
+    unsigned int counter_mask = ((1 << ticker_width) - 1);
+
+    return (timestamp & counter_mask);
+}
+
+bool compare_timestamps(unsigned int delta_ticks, unsigned int ticker_width, unsigned int expected, unsigned int actual)
+{
+    const unsigned int counter_mask = ((1 << ticker_width) - 1);
+
+    const unsigned int lower_bound = ((expected - delta_ticks) & counter_mask);
+    const unsigned int upper_bound = ((expected + delta_ticks) & counter_mask);
+
+    if (lower_bound < upper_bound) {
+        if (actual >= lower_bound && actual <= upper_bound) {
+            return true;
+        } else {
+            return false;
+        }
+    } else {
+        if ((actual >= lower_bound && actual <= counter_mask) || (actual >= 0 && actual <= upper_bound)) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
+
+void busy_wait_ms(int ms)
+{
+    const ticker_info_t *info = us_ticker_get_info();
+    uint32_t mask = (1 << info->bits) - 1;
+    int delay = (int)((uint64_t) ms * info->frequency / 1000);
+
+    uint32_t prev = us_ticker_read();
+    while (delay > 0) {
+        uint32_t next = us_ticker_read();
+        delay -= (next - prev) & mask;
+        prev = next;
+    }
+}
+
+void us_ticker_isr(const ticker_data_t *const ticker_data)
+{
+    us_ticker_clear_interrupt();
+}
+
+#if DEVICE_LPTICKER
+void lp_ticker_isr(const ticker_data_t *const ticker_data)
+{
+    lp_ticker_clear_interrupt();
+}
+#endif
+
+#endif
+
+/** @}*/
+/** @}*/