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Diff: targets/TARGET_STM/us_ticker_32b.c
- Revision:
- 0:13413ea9a877
diff -r 000000000000 -r 13413ea9a877 targets/TARGET_STM/us_ticker_32b.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_STM/us_ticker_32b.c Sun Jun 12 14:02:44 2022 +0000 @@ -0,0 +1,67 @@ +/* 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 <stddef.h> +#include "us_ticker_api.h" +#include "PeripheralNames.h" +#include "hal_tick.h" + +// A 32-bit timer is used +#if !TIM_MST_16BIT + +TIM_HandleTypeDef TimMasterHandle; + +void us_ticker_init(void) +{ + /* NOTE: assuming that HAL tick has already been initialized! */ +} + +uint32_t us_ticker_read() +{ + return TIM_MST->CNT; +} + +void us_ticker_set_interrupt(timestamp_t timestamp) +{ + // NOTE: This function must be called with interrupts disabled to keep our + // timer interrupt setup atomic + + // disable IT while we are handling the correct timestamp + __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1); + // Set new output compare value + __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp); + // Enable IT + __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1); +} + +void us_ticker_fire_interrupt(void) +{ + LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance); +} + +/* NOTE: must be called with interrupts disabled! */ +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); +} + +#endif // !TIM_MST_16BIT +