mbed library sources
Dependents: FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more
Diff: targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/us_ticker.c
- Revision:
- 0:6bc4ac881c8e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/us_ticker.c Thu Jul 28 15:56:34 2016 +0000 @@ -0,0 +1,82 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 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 "fsl_pit_hal.h" +#include "fsl_sim_hal.h" +#include "fsl_clock_manager.h" + +static int us_ticker_inited = 0; + +void us_ticker_init(void) { + if (us_ticker_inited) { + return; + } + us_ticker_inited = 1; + + //Common for ticker/timer + uint32_t busClock; + CLOCK_SYS_EnablePitClock(0); + PIT_HAL_Enable(PIT_BASE); + CLOCK_SYS_GetFreq(kBusClock, &busClock); + + //Timer + PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 0, busClock / 1000000 - 1); + PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 1, 0xFFFFFFFF); + PIT_HAL_SetTimerChainCmd(PIT_BASE, 1, true); + PIT_HAL_StartTimer(PIT_BASE, 0); + PIT_HAL_StartTimer(PIT_BASE, 1); + + //Ticker + PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 2, busClock / 1000000 - 1); + PIT_HAL_SetTimerChainCmd(PIT_BASE, 3, true); + NVIC_SetVector(PIT3_IRQn, (uint32_t)us_ticker_irq_handler); + NVIC_EnableIRQ(PIT3_IRQn); +} + + +uint32_t us_ticker_read() { + if (!us_ticker_inited) { + us_ticker_init(); + } + + return ~(PIT_HAL_ReadTimerCount(PIT_BASE, 1)); +} + +void us_ticker_disable_interrupt(void) { + PIT_HAL_SetIntCmd(PIT_BASE, 3, false); +} + +void us_ticker_clear_interrupt(void) { + PIT_HAL_ClearIntFlag(PIT_BASE, 3); +} + +void us_ticker_set_interrupt(timestamp_t timestamp) { + int delta = (int)(timestamp - us_ticker_read()); + if (delta <= 0) { + // This event was in the past: + us_ticker_irq_handler(); + return; + } + + PIT_HAL_StopTimer(PIT_BASE, 3); + PIT_HAL_StopTimer(PIT_BASE, 2); + PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 3, (uint32_t)delta); + PIT_HAL_SetIntCmd(PIT_BASE, 3, true); + PIT_HAL_StartTimer(PIT_BASE, 3); + PIT_HAL_StartTimer(PIT_BASE, 2); +}