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_KW41Z/us_ticker.c@174:b96e65c34a4d, 2017-10-02 (annotated)

Committer:
AnnaBridge
Date:
Mon Oct 02 15:33:19 2017 +0100
Revision:
174:b96e65c34a4d
Parent:
154:37f96f9d4de2
Child:
177:d650f5d4c87a
This updates the lib to the mbed lib v 152

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_lptmr.h"
<> 154:37f96f9d4de2 21 #include "fsl_clock_config.h"
<> 154:37f96f9d4de2 22
<> 154:37f96f9d4de2 23 static int us_ticker_inited = 0;
<> 154:37f96f9d4de2 24
<> 154:37f96f9d4de2 25 void us_ticker_init(void) {
<> 154:37f96f9d4de2 26 if (us_ticker_inited) {
<> 154:37f96f9d4de2 27 return;
<> 154:37f96f9d4de2 28 }
<> 154:37f96f9d4de2 29 us_ticker_inited = 1;
<> 154:37f96f9d4de2 30
<> 154:37f96f9d4de2 31 //Timer uses PIT
<> 154:37f96f9d4de2 32 //Common for ticker/timer
<> 154:37f96f9d4de2 33 uint32_t busClock;
<> 154:37f96f9d4de2 34
<> 154:37f96f9d4de2 35 // Structure to initialize PIT
<> 154:37f96f9d4de2 36 pit_config_t pitConfig;
<> 154:37f96f9d4de2 37
<> 154:37f96f9d4de2 38 PIT_GetDefaultConfig(&pitConfig);
<> 154:37f96f9d4de2 39 PIT_Init(PIT, &pitConfig);
<> 154:37f96f9d4de2 40
<> 154:37f96f9d4de2 41 busClock = CLOCK_GetFreq(kCLOCK_BusClk);
<> 154:37f96f9d4de2 42
<> 154:37f96f9d4de2 43 PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
<> 154:37f96f9d4de2 44 PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
<> 154:37f96f9d4de2 45 PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
<> 154:37f96f9d4de2 46 PIT_StartTimer(PIT, kPIT_Chnl_0);
<> 154:37f96f9d4de2 47 PIT_StartTimer(PIT, kPIT_Chnl_1);
<> 154:37f96f9d4de2 48
<> 154:37f96f9d4de2 49 //Ticker uses LPTMR
<> 154:37f96f9d4de2 50 lptmr_config_t lptmrConfig;
<> 154:37f96f9d4de2 51 LPTMR_GetDefaultConfig(&lptmrConfig);
<> 154:37f96f9d4de2 52 lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_0;
<> 154:37f96f9d4de2 53 LPTMR_Init(LPTMR0, &lptmrConfig);
<> 154:37f96f9d4de2 54
<> 154:37f96f9d4de2 55 busClock = CLOCK_GetFreq(kCLOCK_McgInternalRefClk);
<> 154:37f96f9d4de2 56 LPTMR_SetTimerPeriod(LPTMR0, busClock / 1000000 - 1);
<> 154:37f96f9d4de2 57 /* Set interrupt handler */
<> 154:37f96f9d4de2 58 NVIC_SetVector(LPTMR0_IRQn, (uint32_t)us_ticker_irq_handler);
<> 154:37f96f9d4de2 59 NVIC_EnableIRQ(LPTMR0_IRQn);
<> 154:37f96f9d4de2 60 }
<> 154:37f96f9d4de2 61
<> 154:37f96f9d4de2 62
<> 154:37f96f9d4de2 63 uint32_t us_ticker_read() {
<> 154:37f96f9d4de2 64 if (!us_ticker_inited) {
<> 154:37f96f9d4de2 65 us_ticker_init();
<> 154:37f96f9d4de2 66 }
<> 154:37f96f9d4de2 67
<> 154:37f96f9d4de2 68 return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1));
<> 154:37f96f9d4de2 69 }
<> 154:37f96f9d4de2 70
<> 154:37f96f9d4de2 71 void us_ticker_disable_interrupt(void) {
<> 154:37f96f9d4de2 72 LPTMR_DisableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
<> 154:37f96f9d4de2 73 }
<> 154:37f96f9d4de2 74
<> 154:37f96f9d4de2 75 void us_ticker_clear_interrupt(void) {
<> 154:37f96f9d4de2 76 LPTMR_ClearStatusFlags(LPTMR0, kLPTMR_TimerCompareFlag);
<> 154:37f96f9d4de2 77 }
<> 154:37f96f9d4de2 78
<> 154:37f96f9d4de2 79 void us_ticker_set_interrupt(timestamp_t timestamp) {
AnnaBridge 174:b96e65c34a4d 80 uint32_t delta = timestamp - us_ticker_read();
<> 154:37f96f9d4de2 81 LPTMR_StopTimer(LPTMR0);
<> 154:37f96f9d4de2 82 LPTMR_SetTimerPeriod(LPTMR0, (uint32_t)delta);
<> 154:37f96f9d4de2 83 LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
<> 154:37f96f9d4de2 84 LPTMR_StartTimer(LPTMR0);
<> 154:37f96f9d4de2 85 }
AnnaBridge 174:b96e65c34a4d 86
AnnaBridge 174:b96e65c34a4d 87 void us_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 88 {
AnnaBridge 174:b96e65c34a4d 89 NVIC_SetPendingIRQ(LPTMR0_IRQn);
AnnaBridge 174:b96e65c34a4d 90 }