Diff: targets/TARGET_STM/TARGET_STM32F1/us_ticker.c

Revision:

153:fa9ff456f731

Parent:

152:9a67f0b066fc

Child:

154:37f96f9d4de2

--- a/targets/TARGET_STM/TARGET_STM32F1/us_ticker.c	Thu Dec 15 11:48:27 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,113 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2014, 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 "us_ticker_api.h"
-#include "PeripheralNames.h"
-
-// Timer selection
-#define TIM_MST TIM4
-
-static TIM_HandleTypeDef TimMasterHandle;
-static int us_ticker_inited = 0;
-
-volatile uint32_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()
-{
-    uint32_t counter, counter2;
-    if (!us_ticker_inited) us_ticker_init();
-    // A situation might appear when Master overflows right after Slave is read and before the
-    // new (overflowed) value of Master is read. Which would make the code below consider the
-    // previous (incorrect) value of Slave and the new value of Master, which would return a
-    // value in the past. Avoid this by computing consecutive values of the timer until they
-    // are properly ordered.
-    counter = (uint32_t)(SlaveCounter << 16);
-    counter += TIM_MST->CNT;
-    while (1) {
-        counter2 = (uint32_t)(SlaveCounter << 16);
-        counter2 += TIM_MST->CNT;
-        if (counter2 > counter) {
-            break;
-        }
-        counter = counter2;
-    }
-    return counter2;
-}
-
-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);
-    }
-}