Diff: targets/TARGET_STM/hal_tick_16b.c

Revision:

153:fa9ff456f731

Child:

156:95d6b41a828b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/hal_tick_16b.c	Tue Dec 20 17:27:56 2016 +0000
@@ -0,0 +1,179 @@
+/* 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 16-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 volatile uint32_t SlaveCounter;
+extern volatile uint32_t oc_int_part;
+extern volatile uint16_t oc_rem_part;
+extern volatile uint8_t  tim_it_update;
+extern volatile uint32_t tim_it_counter;
+
+volatile uint32_t PreviousVal = 0;
+
+void us_ticker_irq_handler(void);
+void set_compare(uint16_t count);
+
+#if defined(TARGET_STM32F0)
+void timer_update_irq_handler(void) {
+#else
+void timer_irq_handler(void)
+{
+#endif
+    uint16_t cnt_val = TIM_MST->CNT;
+    TimMasterHandle.Instance = TIM_MST;
+
+    // Clear Update interrupt flag
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
+        if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_UPDATE) == SET) {
+            __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_UPDATE);
+            SlaveCounter++;
+            tim_it_counter = cnt_val + (uint32_t)(SlaveCounter << 16);
+            tim_it_update = 1;
+        }
+    }
+
+#if defined(TARGET_STM32F0)
+} // end timer_update_irq_handler function
+// Used for mbed timeout (channel 1) and HAL tick (channel 2)
+void timer_oc_irq_handler(void)
+{
+    uint16_t cnt_val = TIM_MST->CNT;
+    TimMasterHandle.Instance = TIM_MST;
+#endif
+
+    // 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);
+            if (oc_rem_part > 0) {
+                set_compare(oc_rem_part); // Finish the remaining time left
+                oc_rem_part = 0;
+            } else {
+                if (oc_int_part > 0) {
+                    set_compare(0xFFFF);
+                    oc_rem_part = cnt_val; // To finish the counter loop the next time
+                    oc_int_part--;
+                } else {
+                    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_SetCompare(&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)
+{
+    // 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;
+    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);
+
+    // Configure output compare channel 2 for HAL tick
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
+    PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
+    __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
+
+    // Configure interrupts
+    // Update interrupt used for 32-bit counter
+    // Output compare channel 1 interrupt for mbed timeout
+    // Output compare channel 2 interrupt for HAL tick
+#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 interrupts
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
+
+    // Enable timer
+    HAL_TIM_Base_Start(&TimMasterHandle);
+
+#if DEBUG_TICK > 0
+    __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;
+}
+
+void HAL_SuspendTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+void HAL_ResumeTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+#endif // TIM_MST_16BIT