added prescaler for 16 bit pwm in LPC1347 target
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targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/us_ticker.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)
- Committer:
- <>
- Date:
- Fri Sep 02 15:07:44 2016 +0100
- Revision:
- 144:ef7eb2e8f9f7
This updates the lib to the mbed lib v125
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 144:ef7eb2e8f9f7 | 3 | * |
<> | 144:ef7eb2e8f9f7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 144:ef7eb2e8f9f7 | 5 | * you may not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 6 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 144:ef7eb2e8f9f7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 13 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 14 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 15 | */ |
<> | 144:ef7eb2e8f9f7 | 16 | #include <stddef.h> |
<> | 144:ef7eb2e8f9f7 | 17 | #include "us_ticker_api.h" |
<> | 144:ef7eb2e8f9f7 | 18 | #include "PeripheralNames.h" |
<> | 144:ef7eb2e8f9f7 | 19 | #include "fsl_pit.h" |
<> | 144:ef7eb2e8f9f7 | 20 | #include "fsl_clock_config.h" |
<> | 144:ef7eb2e8f9f7 | 21 | |
<> | 144:ef7eb2e8f9f7 | 22 | static int us_ticker_inited = 0; |
<> | 144:ef7eb2e8f9f7 | 23 | |
<> | 144:ef7eb2e8f9f7 | 24 | void us_ticker_init(void) { |
<> | 144:ef7eb2e8f9f7 | 25 | if (us_ticker_inited) { |
<> | 144:ef7eb2e8f9f7 | 26 | return; |
<> | 144:ef7eb2e8f9f7 | 27 | } |
<> | 144:ef7eb2e8f9f7 | 28 | us_ticker_inited = 1; |
<> | 144:ef7eb2e8f9f7 | 29 | // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init |
<> | 144:ef7eb2e8f9f7 | 30 | if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK) |
<> | 144:ef7eb2e8f9f7 | 31 | BOARD_BootClockRUN(); |
<> | 144:ef7eb2e8f9f7 | 32 | //Common for ticker/timer |
<> | 144:ef7eb2e8f9f7 | 33 | uint32_t busClock; |
<> | 144:ef7eb2e8f9f7 | 34 | // Structure to initialize PIT |
<> | 144:ef7eb2e8f9f7 | 35 | pit_config_t pitConfig; |
<> | 144:ef7eb2e8f9f7 | 36 | |
<> | 144:ef7eb2e8f9f7 | 37 | PIT_GetDefaultConfig(&pitConfig); |
<> | 144:ef7eb2e8f9f7 | 38 | PIT_Init(PIT, &pitConfig); |
<> | 144:ef7eb2e8f9f7 | 39 | |
<> | 144:ef7eb2e8f9f7 | 40 | busClock = CLOCK_GetFreq(kCLOCK_BusClk); |
<> | 144:ef7eb2e8f9f7 | 41 | |
<> | 144:ef7eb2e8f9f7 | 42 | //Timer |
<> | 144:ef7eb2e8f9f7 | 43 | PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1); |
<> | 144:ef7eb2e8f9f7 | 44 | PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF); |
<> | 144:ef7eb2e8f9f7 | 45 | PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true); |
<> | 144:ef7eb2e8f9f7 | 46 | PIT_StartTimer(PIT, kPIT_Chnl_0); |
<> | 144:ef7eb2e8f9f7 | 47 | PIT_StartTimer(PIT, kPIT_Chnl_1); |
<> | 144:ef7eb2e8f9f7 | 48 | |
<> | 144:ef7eb2e8f9f7 | 49 | //Ticker |
<> | 144:ef7eb2e8f9f7 | 50 | PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1); |
<> | 144:ef7eb2e8f9f7 | 51 | PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true); |
<> | 144:ef7eb2e8f9f7 | 52 | NVIC_SetVector(PIT3_IRQn, (uint32_t)us_ticker_irq_handler); |
<> | 144:ef7eb2e8f9f7 | 53 | NVIC_EnableIRQ(PIT3_IRQn); |
<> | 144:ef7eb2e8f9f7 | 54 | } |
<> | 144:ef7eb2e8f9f7 | 55 | |
<> | 144:ef7eb2e8f9f7 | 56 | |
<> | 144:ef7eb2e8f9f7 | 57 | uint32_t us_ticker_read() { |
<> | 144:ef7eb2e8f9f7 | 58 | if (!us_ticker_inited) { |
<> | 144:ef7eb2e8f9f7 | 59 | us_ticker_init(); |
<> | 144:ef7eb2e8f9f7 | 60 | } |
<> | 144:ef7eb2e8f9f7 | 61 | |
<> | 144:ef7eb2e8f9f7 | 62 | return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1)); |
<> | 144:ef7eb2e8f9f7 | 63 | } |
<> | 144:ef7eb2e8f9f7 | 64 | |
<> | 144:ef7eb2e8f9f7 | 65 | void us_ticker_disable_interrupt(void) { |
<> | 144:ef7eb2e8f9f7 | 66 | PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable); |
<> | 144:ef7eb2e8f9f7 | 67 | } |
<> | 144:ef7eb2e8f9f7 | 68 | |
<> | 144:ef7eb2e8f9f7 | 69 | void us_ticker_clear_interrupt(void) { |
<> | 144:ef7eb2e8f9f7 | 70 | PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK); |
<> | 144:ef7eb2e8f9f7 | 71 | } |
<> | 144:ef7eb2e8f9f7 | 72 | |
<> | 144:ef7eb2e8f9f7 | 73 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
<> | 144:ef7eb2e8f9f7 | 74 | int delta = (int)(timestamp - us_ticker_read()); |
<> | 144:ef7eb2e8f9f7 | 75 | if (delta <= 0) { |
<> | 144:ef7eb2e8f9f7 | 76 | // This event was in the past. |
<> | 144:ef7eb2e8f9f7 | 77 | // Set the interrupt as pending, but don't process it here. |
<> | 144:ef7eb2e8f9f7 | 78 | // This prevents a recurive loop under heavy load |
<> | 144:ef7eb2e8f9f7 | 79 | // which can lead to a stack overflow. |
<> | 144:ef7eb2e8f9f7 | 80 | NVIC_SetPendingIRQ(PIT3_IRQn); |
<> | 144:ef7eb2e8f9f7 | 81 | return; |
<> | 144:ef7eb2e8f9f7 | 82 | } |
<> | 144:ef7eb2e8f9f7 | 83 | |
<> | 144:ef7eb2e8f9f7 | 84 | PIT_StopTimer(PIT, kPIT_Chnl_3); |
<> | 144:ef7eb2e8f9f7 | 85 | PIT_StopTimer(PIT, kPIT_Chnl_2); |
<> | 144:ef7eb2e8f9f7 | 86 | PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta); |
<> | 144:ef7eb2e8f9f7 | 87 | PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable); |
<> | 144:ef7eb2e8f9f7 | 88 | PIT_StartTimer(PIT, kPIT_Chnl_3); |
<> | 144:ef7eb2e8f9f7 | 89 | PIT_StartTimer(PIT, kPIT_Chnl_2); |
<> | 144:ef7eb2e8f9f7 | 90 | } |