teralytic
mbed library sources. Supersedes mbed-src.
Diff: targets/hal/TARGET_STM/TARGET_STM32L0/us_ticker.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 136:5728e9819171
--- a/targets/hal/TARGET_STM/TARGET_STM32L0/us_ticker.c Tue Aug 02 14:07:36 2016 +0000
+++ b/targets/hal/TARGET_STM/TARGET_STM32L0/us_ticker.c Fri Sep 02 15:07:44 2016 +0100
@@ -1,130 +1,121 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include <stddef.h>
-#include <stdbool.h>
-#include "us_ticker_api.h"
-#include "PeripheralNames.h"
-
-// Timer selection
-#define TIM_MST TIM21
-
-static TIM_HandleTypeDef TimMasterHandle;
-static int us_ticker_inited = 0;
-static bool us_ticker_stabilized = false;
-
-volatile uint16_t SlaveCounter = 0;
-volatile uint32_t oc_int_part = 0;
-volatile uint16_t oc_rem_part = 0;
-
-void set_compare(uint16_t count)
-{
- TimMasterHandle.Instance = TIM_MST;
- // Set new output compare value
- __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, count);
- // Enable IT
- __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
-}
-
-void us_ticker_init(void)
-{
- if (us_ticker_inited) return;
- us_ticker_inited = 1;
-
- HAL_InitTick(0); // The passed value is not used
-}
-
-uint32_t us_ticker_read()
-{
- volatile uint16_t cntH_old, cntH, cntL;
-
- if (!us_ticker_inited) us_ticker_init();
-
- // There's a situation where the first tick still may overflow and to avoid
- // it we need to check if our ticker has stabilized and due to that we need
- // to return only the lower part of your 32 bit software timer.
- if (us_ticker_stabilized) {
- do {
- // For some reason on L0xx series we need to read and clear the
- // overflow flag which give extra time to propelry handle possible
- // hiccup after ~60s
- if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF) == SET) {
- __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF);
- }
- cntH_old = SlaveCounter;
- if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
- cntH_old += 1;
- }
- cntL = TIM_MST->CNT;
-
- cntH = SlaveCounter;
- if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
- cntH += 1;
- }
- } while(cntH_old != cntH);
- } else {
- us_ticker_stabilized = true;
- return (uint32_t) TIM_MST->CNT;
- }
-
- // Glue the upper and lower part together to get a 32 bit timer
- return (uint32_t)(cntH << 16 | cntL);
-}
-
-void us_ticker_set_interrupt(timestamp_t timestamp)
-{
- int delta = (int)((uint32_t)timestamp - us_ticker_read());
- uint16_t cval = TIM_MST->CNT;
-
- if (delta <= 0) { // This event was in the past
- us_ticker_irq_handler();
- } else {
- oc_int_part = (uint32_t)(delta >> 16);
- oc_rem_part = (uint16_t)(delta & 0xFFFF);
- if (oc_rem_part <= (0xFFFF - cval)) {
- set_compare(cval + oc_rem_part);
- oc_rem_part = 0;
- } else {
- set_compare(0xFFFF);
- oc_rem_part = oc_rem_part - (0xFFFF - cval);
- }
- }
-}
-
-void us_ticker_disable_interrupt(void)
-{
- TimMasterHandle.Instance = TIM_MST;
- __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
-}
-
-void us_ticker_clear_interrupt(void)
-{
- TimMasterHandle.Instance = TIM_MST;
- if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
- __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
- }
-}
+/* mbed Microcontroller Library
+ * Copyright (c) 2015, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <stddef.h>
+#include <stdbool.h>
+#include "us_ticker_api.h"
+#include "PeripheralNames.h"
+
+// Timer selection
+#define TIM_MST TIM21
+
+static TIM_HandleTypeDef TimMasterHandle;
+static int us_ticker_inited = 0;
+
+volatile uint16_t SlaveCounter = 0;
+volatile uint32_t oc_int_part = 0;
+volatile uint16_t oc_rem_part = 0;
+
+void set_compare(uint16_t count)
+{
+ TimMasterHandle.Instance = TIM_MST;
+ // Set new output compare value
+ __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, count);
+ // Enable IT
+ __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+void us_ticker_init(void)
+{
+ if (us_ticker_inited) return;
+ us_ticker_inited = 1;
+
+ HAL_InitTick(0); // The passed value is not used
+}
+
+uint32_t us_ticker_read()
+{
+ volatile uint16_t cntH_old, cntH, cntL;
+
+ if (!us_ticker_inited) us_ticker_init();
+
+ do {
+ // For some reason on L0xx series we need to read and clear the
+ // overflow flag which give extra time to propelry handle possible
+ // hiccup after ~60s
+ if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF) == SET) {
+ __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF);
+ }
+ cntH_old = SlaveCounter;
+ if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
+ cntH_old += 1;
+ }
+ cntL = TIM_MST->CNT;
+
+ cntH = SlaveCounter;
+ if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
+ cntH += 1;
+ }
+ } while(cntH_old != cntH);
+
+ // Glue the upper and lower part together to get a 32 bit timer
+ return (uint32_t)(cntH << 16 | cntL);
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp)
+{
+ int delta = (int)((uint32_t)timestamp - us_ticker_read());
+ uint16_t cval = TIM_MST->CNT;
+
+ if (delta <= 0) { // This event was in the past
+ us_ticker_irq_handler();
+ } else {
+ oc_int_part = (uint32_t)(delta >> 16);
+ oc_rem_part = (uint16_t)(delta & 0xFFFF);
+ if (oc_rem_part <= (0xFFFF - cval)) {
+ set_compare(cval + oc_rem_part);
+ oc_rem_part = 0;
+ } else {
+ set_compare(0xFFFF);
+ oc_rem_part = oc_rem_part - (0xFFFF - cval);
+ }
+ }
+}
+
+void us_ticker_disable_interrupt(void)
+{
+ TimMasterHandle.Instance = TIM_MST;
+ __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+void us_ticker_clear_interrupt(void)
+{
+ TimMasterHandle.Instance = TIM_MST;
+ if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
+ __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
+ }
+}