Amit Gandhi / mbed-dev

test

Fork of mbed-dev by mbed official

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K24F/us_ticker.c@178:d650f5d4c87a, 2017-11-08 (annotated)

Committer:
AnnaBridge
Date:
Wed Nov 08 13:50:44 2017 +0000
Revision:
178:d650f5d4c87a
Parent:
175:b96e65c34a4d 
This updates the lib to the mbed lib v 155

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 166:e614a9f1c9e2 1 /* mbed Microcontroller Library
AnnaBridge 166:e614a9f1c9e2 2 * Copyright (c) 2006-2017 ARM Limited
AnnaBridge 166:e614a9f1c9e2 3 *
AnnaBridge 166:e614a9f1c9e2 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 166:e614a9f1c9e2 5 * you may not use this file except in compliance with the License.
AnnaBridge 166:e614a9f1c9e2 6 * You may obtain a copy of the License at
AnnaBridge 166:e614a9f1c9e2 7 *
AnnaBridge 166:e614a9f1c9e2 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 166:e614a9f1c9e2 9 *
AnnaBridge 166:e614a9f1c9e2 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 166:e614a9f1c9e2 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 166:e614a9f1c9e2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 166:e614a9f1c9e2 13 * See the License for the specific language governing permissions and
AnnaBridge 166:e614a9f1c9e2 14 * limitations under the License.
AnnaBridge 166:e614a9f1c9e2 15 */
AnnaBridge 166:e614a9f1c9e2 16 #include <stddef.h>
AnnaBridge 166:e614a9f1c9e2 17 #include "us_ticker_api.h"
AnnaBridge 166:e614a9f1c9e2 18 #include "PeripheralNames.h"
AnnaBridge 166:e614a9f1c9e2 19 #include "fsl_pit.h"
AnnaBridge 166:e614a9f1c9e2 20 #include "fsl_clock_config.h"
AnnaBridge 166:e614a9f1c9e2 21
AnnaBridge 166:e614a9f1c9e2 22 static int us_ticker_inited = 0;
AnnaBridge 166:e614a9f1c9e2 23
AnnaBridge 178:d650f5d4c87a 24 static void pit_isr(void)
AnnaBridge 178:d650f5d4c87a 25 {
AnnaBridge 178:d650f5d4c87a 26 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
AnnaBridge 178:d650f5d4c87a 27 PIT_ClearStatusFlags(PIT, kPIT_Chnl_2, PIT_TFLG_TIF_MASK);
AnnaBridge 178:d650f5d4c87a 28 PIT_StopTimer(PIT, kPIT_Chnl_2);
AnnaBridge 178:d650f5d4c87a 29 PIT_StopTimer(PIT, kPIT_Chnl_3);
AnnaBridge 178:d650f5d4c87a 30
AnnaBridge 178:d650f5d4c87a 31 us_ticker_irq_handler();
AnnaBridge 178:d650f5d4c87a 32 }
AnnaBridge 178:d650f5d4c87a 33
AnnaBridge 166:e614a9f1c9e2 34 void us_ticker_init(void)
AnnaBridge 166:e614a9f1c9e2 35 {
AnnaBridge 166:e614a9f1c9e2 36 if (us_ticker_inited) {
AnnaBridge 166:e614a9f1c9e2 37 return;
AnnaBridge 166:e614a9f1c9e2 38 }
AnnaBridge 166:e614a9f1c9e2 39 us_ticker_inited = 1;
AnnaBridge 166:e614a9f1c9e2 40 //Common for ticker/timer
AnnaBridge 166:e614a9f1c9e2 41 uint32_t busClock;
AnnaBridge 166:e614a9f1c9e2 42 // Structure to initialize PIT
AnnaBridge 166:e614a9f1c9e2 43 pit_config_t pitConfig;
AnnaBridge 166:e614a9f1c9e2 44
AnnaBridge 166:e614a9f1c9e2 45 PIT_GetDefaultConfig(&pitConfig);
AnnaBridge 166:e614a9f1c9e2 46 PIT_Init(PIT, &pitConfig);
AnnaBridge 166:e614a9f1c9e2 47
AnnaBridge 166:e614a9f1c9e2 48 busClock = CLOCK_GetFreq(kCLOCK_BusClk);
AnnaBridge 166:e614a9f1c9e2 49
AnnaBridge 166:e614a9f1c9e2 50 //Timer
AnnaBridge 166:e614a9f1c9e2 51 PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
AnnaBridge 166:e614a9f1c9e2 52 PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
AnnaBridge 166:e614a9f1c9e2 53 PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
AnnaBridge 166:e614a9f1c9e2 54 PIT_StartTimer(PIT, kPIT_Chnl_0);
AnnaBridge 166:e614a9f1c9e2 55 PIT_StartTimer(PIT, kPIT_Chnl_1);
AnnaBridge 166:e614a9f1c9e2 56
AnnaBridge 166:e614a9f1c9e2 57 //Ticker
AnnaBridge 166:e614a9f1c9e2 58 PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
AnnaBridge 166:e614a9f1c9e2 59 PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
AnnaBridge 178:d650f5d4c87a 60 NVIC_SetVector(PIT3_IRQn, (uint32_t)pit_isr);
AnnaBridge 166:e614a9f1c9e2 61 NVIC_EnableIRQ(PIT3_IRQn);
AnnaBridge 166:e614a9f1c9e2 62 }
AnnaBridge 166:e614a9f1c9e2 63
AnnaBridge 166:e614a9f1c9e2 64
AnnaBridge 166:e614a9f1c9e2 65 uint32_t us_ticker_read()
AnnaBridge 166:e614a9f1c9e2 66 {
AnnaBridge 166:e614a9f1c9e2 67 if (!us_ticker_inited) {
AnnaBridge 166:e614a9f1c9e2 68 us_ticker_init();
AnnaBridge 166:e614a9f1c9e2 69 }
AnnaBridge 166:e614a9f1c9e2 70
AnnaBridge 166:e614a9f1c9e2 71 return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1));
AnnaBridge 166:e614a9f1c9e2 72 }
AnnaBridge 166:e614a9f1c9e2 73
AnnaBridge 166:e614a9f1c9e2 74 void us_ticker_disable_interrupt(void)
AnnaBridge 166:e614a9f1c9e2 75 {
AnnaBridge 166:e614a9f1c9e2 76 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
AnnaBridge 166:e614a9f1c9e2 77 }
AnnaBridge 166:e614a9f1c9e2 78
AnnaBridge 166:e614a9f1c9e2 79 void us_ticker_clear_interrupt(void)
AnnaBridge 166:e614a9f1c9e2 80 {
AnnaBridge 166:e614a9f1c9e2 81 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
AnnaBridge 166:e614a9f1c9e2 82 }
AnnaBridge 166:e614a9f1c9e2 83
AnnaBridge 166:e614a9f1c9e2 84 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 166:e614a9f1c9e2 85 {
AnnaBridge 175:b96e65c34a4d 86 uint32_t delta = timestamp - us_ticker_read();
AnnaBridge 166:e614a9f1c9e2 87 PIT_StopTimer(PIT, kPIT_Chnl_3);
AnnaBridge 166:e614a9f1c9e2 88 PIT_StopTimer(PIT, kPIT_Chnl_2);
AnnaBridge 166:e614a9f1c9e2 89 PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta);
AnnaBridge 166:e614a9f1c9e2 90 PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
AnnaBridge 166:e614a9f1c9e2 91 PIT_StartTimer(PIT, kPIT_Chnl_3);
AnnaBridge 166:e614a9f1c9e2 92 PIT_StartTimer(PIT, kPIT_Chnl_2);
AnnaBridge 166:e614a9f1c9e2 93 }
AnnaBridge 175:b96e65c34a4d 94
AnnaBridge 175:b96e65c34a4d 95 void us_ticker_fire_interrupt(void)
AnnaBridge 175:b96e65c34a4d 96 {
AnnaBridge 175:b96e65c34a4d 97 NVIC_SetPendingIRQ(PIT3_IRQn);
AnnaBridge 175:b96e65c34a4d 98 }