mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K24F/us_ticker.c@174:b96e65c34a4d, 2017-10-02 (annotated)

Committer:
AnnaBridge
Date:
Mon Oct 02 15:33:19 2017 +0100
Revision:
174:b96e65c34a4d
Parent:
165:e614a9f1c9e2
Child:
177:d650f5d4c87a
This updates the lib to the mbed lib v 152

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 165:e614a9f1c9e2 1 /* mbed Microcontroller Library
AnnaBridge 165:e614a9f1c9e2 2 * Copyright (c) 2006-2017 ARM Limited
AnnaBridge 165:e614a9f1c9e2 3 *
AnnaBridge 165:e614a9f1c9e2 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 165:e614a9f1c9e2 5 * you may not use this file except in compliance with the License.
AnnaBridge 165:e614a9f1c9e2 6 * You may obtain a copy of the License at
AnnaBridge 165:e614a9f1c9e2 7 *
AnnaBridge 165:e614a9f1c9e2 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 165:e614a9f1c9e2 9 *
AnnaBridge 165:e614a9f1c9e2 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 165:e614a9f1c9e2 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 165:e614a9f1c9e2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 165:e614a9f1c9e2 13 * See the License for the specific language governing permissions and
AnnaBridge 165:e614a9f1c9e2 14 * limitations under the License.
AnnaBridge 165:e614a9f1c9e2 15 */
AnnaBridge 165:e614a9f1c9e2 16 #include <stddef.h>
AnnaBridge 165:e614a9f1c9e2 17 #include "us_ticker_api.h"
AnnaBridge 165:e614a9f1c9e2 18 #include "PeripheralNames.h"
AnnaBridge 165:e614a9f1c9e2 19 #include "fsl_pit.h"
AnnaBridge 165:e614a9f1c9e2 20 #include "fsl_clock_config.h"
AnnaBridge 165:e614a9f1c9e2 21
AnnaBridge 165:e614a9f1c9e2 22 static int us_ticker_inited = 0;
AnnaBridge 165:e614a9f1c9e2 23
AnnaBridge 165:e614a9f1c9e2 24 void us_ticker_init(void)
AnnaBridge 165:e614a9f1c9e2 25 {
AnnaBridge 165:e614a9f1c9e2 26 if (us_ticker_inited) {
AnnaBridge 165:e614a9f1c9e2 27 return;
AnnaBridge 165:e614a9f1c9e2 28 }
AnnaBridge 165:e614a9f1c9e2 29 us_ticker_inited = 1;
AnnaBridge 165:e614a9f1c9e2 30 //Common for ticker/timer
AnnaBridge 165:e614a9f1c9e2 31 uint32_t busClock;
AnnaBridge 165:e614a9f1c9e2 32 // Structure to initialize PIT
AnnaBridge 165:e614a9f1c9e2 33 pit_config_t pitConfig;
AnnaBridge 165:e614a9f1c9e2 34
AnnaBridge 165:e614a9f1c9e2 35 PIT_GetDefaultConfig(&pitConfig);
AnnaBridge 165:e614a9f1c9e2 36 PIT_Init(PIT, &pitConfig);
AnnaBridge 165:e614a9f1c9e2 37
AnnaBridge 165:e614a9f1c9e2 38 busClock = CLOCK_GetFreq(kCLOCK_BusClk);
AnnaBridge 165:e614a9f1c9e2 39
AnnaBridge 165:e614a9f1c9e2 40 //Timer
AnnaBridge 165:e614a9f1c9e2 41 PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
AnnaBridge 165:e614a9f1c9e2 42 PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
AnnaBridge 165:e614a9f1c9e2 43 PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
AnnaBridge 165:e614a9f1c9e2 44 PIT_StartTimer(PIT, kPIT_Chnl_0);
AnnaBridge 165:e614a9f1c9e2 45 PIT_StartTimer(PIT, kPIT_Chnl_1);
AnnaBridge 165:e614a9f1c9e2 46
AnnaBridge 165:e614a9f1c9e2 47 //Ticker
AnnaBridge 165:e614a9f1c9e2 48 PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
AnnaBridge 165:e614a9f1c9e2 49 PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
AnnaBridge 165:e614a9f1c9e2 50 NVIC_SetVector(PIT3_IRQn, (uint32_t)us_ticker_irq_handler);
AnnaBridge 165:e614a9f1c9e2 51 NVIC_EnableIRQ(PIT3_IRQn);
AnnaBridge 165:e614a9f1c9e2 52 }
AnnaBridge 165:e614a9f1c9e2 53
AnnaBridge 165:e614a9f1c9e2 54
AnnaBridge 165:e614a9f1c9e2 55 uint32_t us_ticker_read()
AnnaBridge 165:e614a9f1c9e2 56 {
AnnaBridge 165:e614a9f1c9e2 57 if (!us_ticker_inited) {
AnnaBridge 165:e614a9f1c9e2 58 us_ticker_init();
AnnaBridge 165:e614a9f1c9e2 59 }
AnnaBridge 165:e614a9f1c9e2 60
AnnaBridge 165:e614a9f1c9e2 61 return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1));
AnnaBridge 165:e614a9f1c9e2 62 }
AnnaBridge 165:e614a9f1c9e2 63
AnnaBridge 165:e614a9f1c9e2 64 void us_ticker_disable_interrupt(void)
AnnaBridge 165:e614a9f1c9e2 65 {
AnnaBridge 165:e614a9f1c9e2 66 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
AnnaBridge 165:e614a9f1c9e2 67 }
AnnaBridge 165:e614a9f1c9e2 68
AnnaBridge 165:e614a9f1c9e2 69 void us_ticker_clear_interrupt(void)
AnnaBridge 165:e614a9f1c9e2 70 {
AnnaBridge 165:e614a9f1c9e2 71 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
AnnaBridge 165:e614a9f1c9e2 72 }
AnnaBridge 165:e614a9f1c9e2 73
AnnaBridge 165:e614a9f1c9e2 74 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 165:e614a9f1c9e2 75 {
AnnaBridge 174:b96e65c34a4d 76 uint32_t delta = timestamp - us_ticker_read();
AnnaBridge 165:e614a9f1c9e2 77 PIT_StopTimer(PIT, kPIT_Chnl_3);
AnnaBridge 165:e614a9f1c9e2 78 PIT_StopTimer(PIT, kPIT_Chnl_2);
AnnaBridge 165:e614a9f1c9e2 79 PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta);
AnnaBridge 165:e614a9f1c9e2 80 PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
AnnaBridge 165:e614a9f1c9e2 81 PIT_StartTimer(PIT, kPIT_Chnl_3);
AnnaBridge 165:e614a9f1c9e2 82 PIT_StartTimer(PIT, kPIT_Chnl_2);
AnnaBridge 165:e614a9f1c9e2 83 }
AnnaBridge 174:b96e65c34a4d 84
AnnaBridge 174:b96e65c34a4d 85 void us_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 86 {
AnnaBridge 174:b96e65c34a4d 87 NVIC_SetPendingIRQ(PIT3_IRQn);
AnnaBridge 174:b96e65c34a4d 88 }