USB Serial application
Fork of USBSerial_HelloWorld by
Diff: mbed-dev/targets/TARGET_STM/hal_tick_32b.c
- Revision:
- 10:41552d038a69
diff -r d88699a0905a -r 41552d038a69 mbed-dev/targets/TARGET_STM/hal_tick_32b.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_STM/hal_tick_32b.c Tue Jan 10 20:42:26 2017 +0000 @@ -0,0 +1,142 @@ +/* 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; + +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_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) +{ + 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 + 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_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY); + __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); + +#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