Ben Katz / mbed-dev_spine

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Fork of mbed-dev-f303 by Ben Katz

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K22F/us_ticker.c@154:37f96f9d4de2, 2017-01-04 (annotated)

Committer:
<>
Date:
Wed Jan 04 16:58:05 2017 +0000
Revision:
154:37f96f9d4de2
Child:
174:b96e65c34a4d
This updates the lib to the mbed lib v133

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 154:37f96f9d4de2 1 /* mbed Microcontroller Library
<> 154:37f96f9d4de2 2 * Copyright (c) 2006-2013 ARM Limited
<> 154:37f96f9d4de2 3 *
<> 154:37f96f9d4de2 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 154:37f96f9d4de2 5 * you may not use this file except in compliance with the License.
<> 154:37f96f9d4de2 6 * You may obtain a copy of the License at
<> 154:37f96f9d4de2 7 *
<> 154:37f96f9d4de2 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 154:37f96f9d4de2 9 *
<> 154:37f96f9d4de2 10 * Unless required by applicable law or agreed to in writing, software
<> 154:37f96f9d4de2 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 154:37f96f9d4de2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 154:37f96f9d4de2 13 * See the License for the specific language governing permissions and
<> 154:37f96f9d4de2 14 * limitations under the License.
<> 154:37f96f9d4de2 15 */
<> 154:37f96f9d4de2 16 #include <stddef.h>
<> 154:37f96f9d4de2 17 #include "us_ticker_api.h"
<> 154:37f96f9d4de2 18 #include "PeripheralNames.h"
<> 154:37f96f9d4de2 19 #include "fsl_pit.h"
<> 154:37f96f9d4de2 20 #include "fsl_clock_config.h"
<> 154:37f96f9d4de2 21
<> 154:37f96f9d4de2 22 static int us_ticker_inited = 0;
<> 154:37f96f9d4de2 23
<> 154:37f96f9d4de2 24 void us_ticker_init(void)
<> 154:37f96f9d4de2 25 {
<> 154:37f96f9d4de2 26 if (us_ticker_inited) {
<> 154:37f96f9d4de2 27 return;
<> 154:37f96f9d4de2 28 }
<> 154:37f96f9d4de2 29 us_ticker_inited = 1;
<> 154:37f96f9d4de2 30 //Common for ticker/timer
<> 154:37f96f9d4de2 31 uint32_t busClock;
<> 154:37f96f9d4de2 32 // Structure to initialize PIT
<> 154:37f96f9d4de2 33 pit_config_t pitConfig;
<> 154:37f96f9d4de2 34
<> 154:37f96f9d4de2 35 PIT_GetDefaultConfig(&pitConfig);
<> 154:37f96f9d4de2 36 PIT_Init(PIT, &pitConfig);
<> 154:37f96f9d4de2 37
<> 154:37f96f9d4de2 38 busClock = CLOCK_GetFreq(kCLOCK_BusClk);
<> 154:37f96f9d4de2 39
<> 154:37f96f9d4de2 40 //Timer
<> 154:37f96f9d4de2 41 PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
<> 154:37f96f9d4de2 42 PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
<> 154:37f96f9d4de2 43 PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
<> 154:37f96f9d4de2 44 PIT_StartTimer(PIT, kPIT_Chnl_0);
<> 154:37f96f9d4de2 45 PIT_StartTimer(PIT, kPIT_Chnl_1);
<> 154:37f96f9d4de2 46
<> 154:37f96f9d4de2 47 //Ticker
<> 154:37f96f9d4de2 48 PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
<> 154:37f96f9d4de2 49 PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
<> 154:37f96f9d4de2 50 NVIC_SetVector(PIT3_IRQn, (uint32_t)us_ticker_irq_handler);
<> 154:37f96f9d4de2 51 NVIC_EnableIRQ(PIT3_IRQn);
<> 154:37f96f9d4de2 52 }
<> 154:37f96f9d4de2 53
<> 154:37f96f9d4de2 54
<> 154:37f96f9d4de2 55 uint32_t us_ticker_read()
<> 154:37f96f9d4de2 56 {
<> 154:37f96f9d4de2 57 if (!us_ticker_inited) {
<> 154:37f96f9d4de2 58 us_ticker_init();
<> 154:37f96f9d4de2 59 }
<> 154:37f96f9d4de2 60
<> 154:37f96f9d4de2 61 return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1));
<> 154:37f96f9d4de2 62 }
<> 154:37f96f9d4de2 63
<> 154:37f96f9d4de2 64 void us_ticker_disable_interrupt(void)
<> 154:37f96f9d4de2 65 {
<> 154:37f96f9d4de2 66 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
<> 154:37f96f9d4de2 67 }
<> 154:37f96f9d4de2 68
<> 154:37f96f9d4de2 69 void us_ticker_clear_interrupt(void)
<> 154:37f96f9d4de2 70 {
<> 154:37f96f9d4de2 71 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
<> 154:37f96f9d4de2 72 }
<> 154:37f96f9d4de2 73
<> 154:37f96f9d4de2 74 void us_ticker_set_interrupt(timestamp_t timestamp)
<> 154:37f96f9d4de2 75 {
<> 154:37f96f9d4de2 76 int delta = (int)(timestamp - us_ticker_read());
<> 154:37f96f9d4de2 77 if (delta <= 0) {
<> 154:37f96f9d4de2 78 // This event was in the past.
<> 154:37f96f9d4de2 79 // Set the interrupt as pending, but don't process it here.
<> 154:37f96f9d4de2 80 // This prevents a recurive loop under heavy load
<> 154:37f96f9d4de2 81 // which can lead to a stack overflow.
<> 154:37f96f9d4de2 82 NVIC_SetPendingIRQ(PIT3_IRQn);
<> 154:37f96f9d4de2 83 return;
<> 154:37f96f9d4de2 84 }
<> 154:37f96f9d4de2 85
<> 154:37f96f9d4de2 86 PIT_StopTimer(PIT, kPIT_Chnl_3);
<> 154:37f96f9d4de2 87 PIT_StopTimer(PIT, kPIT_Chnl_2);
<> 154:37f96f9d4de2 88 PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta);
<> 154:37f96f9d4de2 89 PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
<> 154:37f96f9d4de2 90 PIT_StartTimer(PIT, kPIT_Chnl_3);
<> 154:37f96f9d4de2 91 PIT_StartTimer(PIT, kPIT_Chnl_2);
<> 154:37f96f9d4de2 92 }