Diff: mbed-dev-master/targets/TARGET_STM/us_ticker.c

Revision:

0:bb348c97df44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev-master/targets/TARGET_STM/us_ticker.c	Wed Sep 16 01:11:49 2020 +0000
@@ -0,0 +1,258 @@
+/* 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 <stddef.h>
+#include "us_ticker_api.h"
+#include "PeripheralNames.h"
+#include "us_ticker_data.h"
+
+TIM_HandleTypeDef TimMasterHandle;
+
+uint32_t timer_cnt_reg;
+uint32_t timer_ccr1_reg;
+uint32_t timer_dier_reg;
+
+const ticker_info_t *us_ticker_get_info()
+{
+    static const ticker_info_t info = {
+        1000000,
+        TIM_MST_BIT_WIDTH
+    };
+    return &info;
+}
+
+void us_ticker_irq_handler(void);
+
+// ************************************ 16-bit timer ************************************
+#if TIM_MST_BIT_WIDTH == 16
+
+extern uint32_t prev_time;
+extern uint32_t elapsed_time;
+
+#if defined(TARGET_STM32F0)
+void timer_update_irq_handler(void)
+{
+#else
+void timer_irq_handler(void)
+{
+#endif
+    TimMasterHandle.Instance = TIM_MST;
+
+#if defined(TARGET_STM32F0)
+} // end timer_update_irq_handler function
+
+void timer_oc_irq_handler(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+#endif
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
+        if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
+            __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
+            us_ticker_irq_handler();
+        }
+    }
+}
+
+void init_16bit_timer(void)
+{
+    // Enable timer clock
+    TIM_MST_RCC;
+
+    // Reset timer
+    TIM_MST_RESET_ON;
+    TIM_MST_RESET_OFF;
+
+    // Update the SystemCoreClock variable
+    SystemCoreClockUpdate();
+
+    // Configure time base
+    TimMasterHandle.Instance           = TIM_MST;
+    TimMasterHandle.Init.Period        = 0xFFFF;
+    TimMasterHandle.Init.Prescaler     = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
+    TimMasterHandle.Init.ClockDivision = 0;
+    TimMasterHandle.Init.CounterMode   = TIM_COUNTERMODE_UP;
+#if !defined(TARGET_STM32L0) && !defined(TARGET_STM32L1)
+    TimMasterHandle.Init.RepetitionCounter = 0;
+#endif
+#ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
+    TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+#endif
+    HAL_TIM_Base_Init(&TimMasterHandle);
+
+    // Configure output compare channel 1 for mbed timeout (enabled later when used)
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
+
+    // Output compare channel 1 interrupt for mbed timeout
+#if defined(TARGET_STM32F0)
+    NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_UP_IRQ);
+    NVIC_SetPriority(TIM_MST_UP_IRQ, 0);
+    NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_OC_IRQ);
+    NVIC_SetPriority(TIM_MST_OC_IRQ, 1);
+#else
+    NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_IRQ);
+#endif
+
+    // Enable timer
+    HAL_TIM_Base_Start(&TimMasterHandle);
+
+    // Freeze timer on stop/breakpoint
+    // Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
+#if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
+    TIM_MST_DBGMCU_FREEZE;
+#endif
+
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+
+    // Used by HAL_GetTick()
+    prev_time = 0;
+    elapsed_time = 0;
+}
+
+// ************************************ 32-bit timer ************************************
+#else
+
+void timer_irq_handler(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
+        if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
+            __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
+            us_ticker_irq_handler();
+        }
+    }
+}
+
+void init_32bit_timer(void)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    uint32_t PclkFreq;
+
+    // Get clock configuration
+    // Note: PclkFreq contains here the Latency (not used after)
+    HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
+
+    // Get timer clock value
+#if TIM_MST_PCLK == 1
+    PclkFreq = HAL_RCC_GetPCLK1Freq();
+#else
+    PclkFreq = HAL_RCC_GetPCLK2Freq();
+#endif
+
+    // Enable timer clock
+    TIM_MST_RCC;
+
+    // Reset timer
+    TIM_MST_RESET_ON;
+    TIM_MST_RESET_OFF;
+
+    // Configure time base
+    TimMasterHandle.Instance    = TIM_MST;
+    TimMasterHandle.Init.Period = 0xFFFFFFFF;
+
+    // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
+#if TIM_MST_PCLK == 1
+    if (RCC_ClkInitStruct.APB1CLKDivider == RCC_HCLK_DIV1) {
+#else
+    if (RCC_ClkInitStruct.APB2CLKDivider == RCC_HCLK_DIV1) {
+#endif
+        TimMasterHandle.Init.Prescaler   = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 us tick
+    } else {
+        TimMasterHandle.Init.Prescaler   = (uint16_t)((PclkFreq * 2) / 1000000) - 1; // 1 us tick
+    }
+
+    TimMasterHandle.Init.ClockDivision     = 0;
+    TimMasterHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
+#if !TARGET_STM32L1
+    TimMasterHandle.Init.RepetitionCounter = 0;
+#endif
+#ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
+    TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+#endif
+    HAL_TIM_OC_Init(&TimMasterHandle);
+
+    NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_IRQ);
+
+    // Channel 1 for mbed timeout
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
+
+    // Freeze timer on stop/breakpoint
+    // Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
+#if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
+    TIM_MST_DBGMCU_FREEZE;
+#endif
+
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+#endif // 16-bit/32-bit timer
+
+void us_ticker_init(void)
+{
+    // Timer is already initialized in HAL_InitTick()
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+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
+    // Set new output compare value
+    __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
+    // Ensure the compare event starts clear
+    __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
+    // Enable IT
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+void us_ticker_fire_interrupt(void)
+{
+    __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
+    LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
+}
+
+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);
+}
+
+void save_timer_ctx(void)
+{
+    timer_cnt_reg = __HAL_TIM_GET_COUNTER(&TimMasterHandle);
+    timer_ccr1_reg = __HAL_TIM_GET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1);
+    timer_dier_reg = TIM_MST->DIER;
+}
+
+void restore_timer_ctx(void)
+{
+    __HAL_TIM_SET_COUNTER(&TimMasterHandle, timer_cnt_reg);
+    __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, timer_ccr1_reg);
+    TIM_MST->DIER = timer_dier_reg;
+}