Diff: targets/TARGET_STM/us_ticker_32b.c

Revision:

0:85b3fd62ea1a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/us_ticker_32b.c	Mon Mar 16 06:35:48 2020 +0000
@@ -0,0 +1,66 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2016 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.
+ */
+#include <stddef.h>
+#include "us_ticker_api.h"
+#include "PeripheralNames.h"
+#include "hal_tick.h"
+
+// A 32-bit timer is used
+#if !TIM_MST_16BIT
+
+TIM_HandleTypeDef TimMasterHandle;
+
+void us_ticker_init(void)
+{
+    /* NOTE: assuming that HAL tick has already been initialized! */
+}
+
+uint32_t us_ticker_read()
+{
+    return TIM_MST->CNT;
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp)
+{
+    // NOTE: This function must be called with interrupts disabled to keep our
+    //       timer interrupt setup atomic
+
+    // disable IT while we are handling the correct timestamp
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+    // Set new output compare value
+    __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
+    // Enable IT
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+void us_ticker_fire_interrupt(void)
+{
+    LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
+}
+
+/* NOTE: must be called with interrupts disabled! */
+void us_ticker_disable_interrupt(void)
+{
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+/* NOTE: must be called with interrupts disabled! */
+void us_ticker_clear_interrupt(void)
+{
+    __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
+}
+
+#endif // !TIM_MST_16BIT