mbed library sources
Dependents: FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more
targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/us_ticker.c@0:6bc4ac881c8e, 2016-07-28 (annotated)
- Committer:
- ebrus
- Date:
- Thu Jul 28 15:56:34 2016 +0000
- Revision:
- 0:6bc4ac881c8e
1;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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ebrus | 0:6bc4ac881c8e | 1 | /* mbed Microcontroller Library |
ebrus | 0:6bc4ac881c8e | 2 | * Copyright (c) 2006-2013 ARM Limited |
ebrus | 0:6bc4ac881c8e | 3 | * |
ebrus | 0:6bc4ac881c8e | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
ebrus | 0:6bc4ac881c8e | 5 | * you may not use this file except in compliance with the License. |
ebrus | 0:6bc4ac881c8e | 6 | * You may obtain a copy of the License at |
ebrus | 0:6bc4ac881c8e | 7 | * |
ebrus | 0:6bc4ac881c8e | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
ebrus | 0:6bc4ac881c8e | 9 | * |
ebrus | 0:6bc4ac881c8e | 10 | * Unless required by applicable law or agreed to in writing, software |
ebrus | 0:6bc4ac881c8e | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
ebrus | 0:6bc4ac881c8e | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
ebrus | 0:6bc4ac881c8e | 13 | * See the License for the specific language governing permissions and |
ebrus | 0:6bc4ac881c8e | 14 | * limitations under the License. |
ebrus | 0:6bc4ac881c8e | 15 | */ |
ebrus | 0:6bc4ac881c8e | 16 | #include <stddef.h> |
ebrus | 0:6bc4ac881c8e | 17 | #include "us_ticker_api.h" |
ebrus | 0:6bc4ac881c8e | 18 | #include "PeripheralNames.h" |
ebrus | 0:6bc4ac881c8e | 19 | #include "fsl_pit_hal.h" |
ebrus | 0:6bc4ac881c8e | 20 | #include "fsl_sim_hal.h" |
ebrus | 0:6bc4ac881c8e | 21 | #include "fsl_clock_manager.h" |
ebrus | 0:6bc4ac881c8e | 22 | |
ebrus | 0:6bc4ac881c8e | 23 | static int us_ticker_inited = 0; |
ebrus | 0:6bc4ac881c8e | 24 | |
ebrus | 0:6bc4ac881c8e | 25 | void us_ticker_init(void) { |
ebrus | 0:6bc4ac881c8e | 26 | if (us_ticker_inited) { |
ebrus | 0:6bc4ac881c8e | 27 | return; |
ebrus | 0:6bc4ac881c8e | 28 | } |
ebrus | 0:6bc4ac881c8e | 29 | us_ticker_inited = 1; |
ebrus | 0:6bc4ac881c8e | 30 | |
ebrus | 0:6bc4ac881c8e | 31 | //Common for ticker/timer |
ebrus | 0:6bc4ac881c8e | 32 | uint32_t busClock; |
ebrus | 0:6bc4ac881c8e | 33 | CLOCK_SYS_EnablePitClock(0); |
ebrus | 0:6bc4ac881c8e | 34 | PIT_HAL_Enable(PIT_BASE); |
ebrus | 0:6bc4ac881c8e | 35 | CLOCK_SYS_GetFreq(kBusClock, &busClock); |
ebrus | 0:6bc4ac881c8e | 36 | |
ebrus | 0:6bc4ac881c8e | 37 | //Timer |
ebrus | 0:6bc4ac881c8e | 38 | PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 0, busClock / 1000000 - 1); |
ebrus | 0:6bc4ac881c8e | 39 | PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 1, 0xFFFFFFFF); |
ebrus | 0:6bc4ac881c8e | 40 | PIT_HAL_SetTimerChainCmd(PIT_BASE, 1, true); |
ebrus | 0:6bc4ac881c8e | 41 | PIT_HAL_StartTimer(PIT_BASE, 0); |
ebrus | 0:6bc4ac881c8e | 42 | PIT_HAL_StartTimer(PIT_BASE, 1); |
ebrus | 0:6bc4ac881c8e | 43 | |
ebrus | 0:6bc4ac881c8e | 44 | //Ticker |
ebrus | 0:6bc4ac881c8e | 45 | PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 2, busClock / 1000000 - 1); |
ebrus | 0:6bc4ac881c8e | 46 | PIT_HAL_SetTimerChainCmd(PIT_BASE, 3, true); |
ebrus | 0:6bc4ac881c8e | 47 | NVIC_SetVector(PIT3_IRQn, (uint32_t)us_ticker_irq_handler); |
ebrus | 0:6bc4ac881c8e | 48 | NVIC_EnableIRQ(PIT3_IRQn); |
ebrus | 0:6bc4ac881c8e | 49 | } |
ebrus | 0:6bc4ac881c8e | 50 | |
ebrus | 0:6bc4ac881c8e | 51 | |
ebrus | 0:6bc4ac881c8e | 52 | uint32_t us_ticker_read() { |
ebrus | 0:6bc4ac881c8e | 53 | if (!us_ticker_inited) { |
ebrus | 0:6bc4ac881c8e | 54 | us_ticker_init(); |
ebrus | 0:6bc4ac881c8e | 55 | } |
ebrus | 0:6bc4ac881c8e | 56 | |
ebrus | 0:6bc4ac881c8e | 57 | return ~(PIT_HAL_ReadTimerCount(PIT_BASE, 1)); |
ebrus | 0:6bc4ac881c8e | 58 | } |
ebrus | 0:6bc4ac881c8e | 59 | |
ebrus | 0:6bc4ac881c8e | 60 | void us_ticker_disable_interrupt(void) { |
ebrus | 0:6bc4ac881c8e | 61 | PIT_HAL_SetIntCmd(PIT_BASE, 3, false); |
ebrus | 0:6bc4ac881c8e | 62 | } |
ebrus | 0:6bc4ac881c8e | 63 | |
ebrus | 0:6bc4ac881c8e | 64 | void us_ticker_clear_interrupt(void) { |
ebrus | 0:6bc4ac881c8e | 65 | PIT_HAL_ClearIntFlag(PIT_BASE, 3); |
ebrus | 0:6bc4ac881c8e | 66 | } |
ebrus | 0:6bc4ac881c8e | 67 | |
ebrus | 0:6bc4ac881c8e | 68 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
ebrus | 0:6bc4ac881c8e | 69 | int delta = (int)(timestamp - us_ticker_read()); |
ebrus | 0:6bc4ac881c8e | 70 | if (delta <= 0) { |
ebrus | 0:6bc4ac881c8e | 71 | // This event was in the past: |
ebrus | 0:6bc4ac881c8e | 72 | us_ticker_irq_handler(); |
ebrus | 0:6bc4ac881c8e | 73 | return; |
ebrus | 0:6bc4ac881c8e | 74 | } |
ebrus | 0:6bc4ac881c8e | 75 | |
ebrus | 0:6bc4ac881c8e | 76 | PIT_HAL_StopTimer(PIT_BASE, 3); |
ebrus | 0:6bc4ac881c8e | 77 | PIT_HAL_StopTimer(PIT_BASE, 2); |
ebrus | 0:6bc4ac881c8e | 78 | PIT_HAL_SetTimerPeriodByCount(PIT_BASE, 3, (uint32_t)delta); |
ebrus | 0:6bc4ac881c8e | 79 | PIT_HAL_SetIntCmd(PIT_BASE, 3, true); |
ebrus | 0:6bc4ac881c8e | 80 | PIT_HAL_StartTimer(PIT_BASE, 3); |
ebrus | 0:6bc4ac881c8e | 81 | PIT_HAL_StartTimer(PIT_BASE, 2); |
ebrus | 0:6bc4ac881c8e | 82 | } |