Diff: targets/TARGET_STM/hal_tick_32b.c

Revision:

0:85b3fd62ea1a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/hal_tick_32b.c	Mon Mar 16 06:35:48 2020 +0000
@@ -0,0 +1,152 @@
+/* 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 "hal_tick.h"
+
+// A 32-bit timer is used
+#if !TIM_MST_16BIT
+
+#define DEBUG_TICK 0 // Set to 1 to toggle a pin (see below which pin) at each tick
+
+extern TIM_HandleTypeDef TimMasterHandle;
+
+extern void HAL_IncTick(void);
+
+volatile uint32_t PreviousVal = 0;
+
+void us_ticker_irq_handler(void);
+
+void timer_irq_handler(void)
+{
+    // Channel 1 for mbed timeout
+    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();
+        }
+    }
+
+    // Channel 2 for HAL tick
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
+        if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC2) == SET) {
+            __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
+            uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
+            if ((val - PreviousVal) >= HAL_TICK_DELAY) {
+                // Increment HAL variable
+                HAL_IncTick();
+                // Prepare next interrupt
+                __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
+                PreviousVal = val;
+#if DEBUG_TICK > 0
+                HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
+#endif
+            }
+        }
+    }
+}
+
+// Reconfigure the HAL tick using a standard timer instead of systick.
+HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
+{
+    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);
+
+    // Channel 2 for HAL tick
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
+    PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
+    __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+
+    // 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
+
+#if DEBUG_TICK > 0
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    GPIO_InitTypeDef GPIO_InitStruct;
+    GPIO_InitStruct.Pin = GPIO_PIN_6;
+    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+#endif
+
+    return HAL_OK;
+}
+
+/* NOTE: must be called with interrupts disabled! */
+void HAL_SuspendTick(void)
+{
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+/* NOTE: must be called with interrupts disabled! */
+void HAL_ResumeTick(void)
+{
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+#endif // !TIM_MST_16BIT