Diff: targets/TARGET_STM/hal_tick_overrides.c

Revision:

187:0387e8f68319

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/hal_tick_overrides.c	Thu Sep 06 13:40:20 2018 +0100
@@ -0,0 +1,79 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2018 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 "hal/us_ticker_api.h"
+#include "us_ticker_data.h"
+
+// This variable is set to 1 at the of mbed_sdk_init function.
+// The ticker_read_us function must not be called until the mbed_sdk_init is terminated.
+extern int mbed_sdk_inited;
+
+// Defined in us_ticker.c
+void init_16bit_timer(void);
+void init_32bit_timer(void);
+
+#if TIM_MST_BIT_WIDTH == 16
+// Variables also reset in us_ticker_init()
+uint32_t prev_time = 0;
+uint32_t elapsed_time = 0;
+#endif
+
+// Overwrite default HAL functions defined as "weak"
+
+HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
+{
+#if TIM_MST_BIT_WIDTH == 16
+    init_16bit_timer();
+#else
+    init_32bit_timer();
+#endif
+    return HAL_OK;
+}
+
+uint32_t HAL_GetTick()
+{
+#if TIM_MST_BIT_WIDTH == 16
+    uint32_t new_time;
+    if (mbed_sdk_inited) {
+        // Apply the latest time recorded just before the sdk is inited
+        new_time = ticker_read_us(get_us_ticker_data()) + prev_time;
+        prev_time = 0; // Use this time only once
+        return (new_time / 1000);
+    }
+    else {
+        new_time = us_ticker_read();
+        elapsed_time += (new_time - prev_time) & 0xFFFF; // Only use the lower 16 bits
+        prev_time = new_time;
+        return (elapsed_time / 1000);
+    }
+#else // 32-bit timer
+    if (mbed_sdk_inited) {
+        return (ticker_read_us(get_us_ticker_data()) / 1000);
+    }
+    else {
+        return (us_ticker_read() / 1000);
+    }
+#endif
+}
+
+void HAL_SuspendTick(void)
+{
+    // Do nothing
+}
+
+void HAL_ResumeTick(void)
+{
+    // Do nothing
+}