mirror of https://github.com/ARMmbed/mbed-os.git
273 lines
7.7 KiB
C
273 lines
7.7 KiB
C
/* 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.
|
|
*/
|
|
|
|
#if DEVICE_USTICKER
|
|
|
|
#include <stddef.h>
|
|
#include "us_ticker_api.h"
|
|
#include "PeripheralNames.h"
|
|
#include "us_ticker_data.h"
|
|
#include "us_ticker_defines.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);
|
|
HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
|
|
}
|
|
|
|
uint32_t (us_ticker_read)()
|
|
{
|
|
/* Invoke the macro */
|
|
return us_ticker_read();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void us_ticker_free(void)
|
|
{
|
|
HAL_TIM_OC_Stop(&TimMasterHandle, TIM_CHANNEL_1);
|
|
us_ticker_disable_interrupt();
|
|
}
|
|
|
|
#endif /* DEVICE_USTICKER */
|