Import Mbed OS hard-float snapshot

targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/lp_ticker.c

@@ -0,0 +1,89 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2019 Arm Limited
+ *
+ * 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.
+ */
+
+/**
+ * Low-power elapsed time measure and interval ticker,
+ * using General Purpose Timer \ref timer_gp_dev_t.
+ */
+
+#include "cmsis.h"
+#include "device_cfg.h"
+#include "timer_gp_drv.h"
+#include "lp_ticker_api.h"
+
+/* Check if the module configuration is right. These definitions
+   are usually located in device_cfg.h */
+#ifndef GP_TIMER_DEV
+#error "Configuration macro GP_TIMER_DEV is undefined!"
+#endif
+
+void lp_ticker_init(void)
+{
+    timer_gp_init(&GP_TIMER_DEV);
+    NVIC_EnableIRQ(GP_TIMER_ALARM0_IRQ);
+    timer_gp_interrupt_disable(&GP_TIMER_DEV, GP_TIMER_ALARM_NR);
+}
+
+void lp_ticker_free(void)
+{
+   /* This function should stop the ticker from counting, but GP Timer cannot
+    * be stopped.
+    */
+    timer_gp_interrupt_disable(&GP_TIMER_DEV, GP_TIMER_ALARM_NR);
+}
+
+uint32_t lp_ticker_read(void)
+{
+    return timer_gp_get_counter(&GP_TIMER_DEV);
+}
+
+void lp_ticker_set_interrupt(timestamp_t timestamp)
+{
+    timer_gp_set_alarm_value(&GP_TIMER_DEV, GP_TIMER_ALARM_NR, (uint32_t)timestamp);
+    timer_gp_interrupt_enable(&GP_TIMER_DEV, GP_TIMER_ALARM_NR);
+}
+
+void lp_ticker_disable_interrupt(void)
+{
+    timer_gp_interrupt_disable(&GP_TIMER_DEV, GP_TIMER_ALARM_NR);
+}
+
+void lp_ticker_clear_interrupt(void)
+{
+    timer_gp_interrupt_clear(&GP_TIMER_DEV, GP_TIMER_ALARM_NR);
+}
+
+void lp_ticker_fire_interrupt(void)
+{
+    NVIC_SetPendingIRQ(GP_TIMER_ALARM0_IRQ);
+}
+
+const ticker_info_t* lp_ticker_get_info(void)
+{
+    static const ticker_info_t info = {
+        GP_TIMER_FREQ_HZ,
+        GP_TIMER_BIT_WIDTH
+    };
+    return &info;
+}
+
+#ifndef GP_TIMER_IRQ0_HANDLER
+#error "GP_TIMER_IRQ0_HANDLER should be defined, check device_cfg.h!"
+#endif
+void GP_TIMER_IRQ0_HANDLER(void)
+{
+    lp_ticker_irq_handler();
+}