mirror of https://github.com/ARMmbed/mbed-os.git
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/* 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);
|
|
|
|
#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
|