mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c@323:9e901b0a5aa1, 2014-09-13 (annotated)
- Committer:
- shaoziyang
- Date:
- Sat Sep 13 14:25:46 2014 +0000
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 304:89b9c3a9a045
test with CLOCK_SETUP = 0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 103:9b881da47c92 | 1 | /* mbed Microcontroller Library |
mbed_official | 103:9b881da47c92 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 103:9b881da47c92 | 3 | * |
mbed_official | 103:9b881da47c92 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 103:9b881da47c92 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 103:9b881da47c92 | 6 | * You may obtain a copy of the License at |
mbed_official | 103:9b881da47c92 | 7 | * |
mbed_official | 103:9b881da47c92 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 103:9b881da47c92 | 9 | * |
mbed_official | 103:9b881da47c92 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 103:9b881da47c92 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 103:9b881da47c92 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 103:9b881da47c92 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 103:9b881da47c92 | 14 | * limitations under the License. |
mbed_official | 103:9b881da47c92 | 15 | */ |
mbed_official | 103:9b881da47c92 | 16 | #include <stddef.h> |
mbed_official | 103:9b881da47c92 | 17 | #include "us_ticker_api.h" |
mbed_official | 103:9b881da47c92 | 18 | #include "PeripheralNames.h" |
mbed_official | 103:9b881da47c92 | 19 | |
mbed_official | 117:e0a7df0a9a56 | 20 | #define US_TICKER_TIMER_IRQn RIT_IRQn |
mbed_official | 103:9b881da47c92 | 21 | |
mbed_official | 103:9b881da47c92 | 22 | int us_ticker_inited = 0; |
mbed_official | 103:9b881da47c92 | 23 | |
mbed_official | 103:9b881da47c92 | 24 | void us_ticker_init(void) { |
mbed_official | 103:9b881da47c92 | 25 | if (us_ticker_inited) return; |
mbed_official | 103:9b881da47c92 | 26 | us_ticker_inited = 1; |
mbed_official | 103:9b881da47c92 | 27 | |
mbed_official | 117:e0a7df0a9a56 | 28 | // Enable the RIT clock |
mbed_official | 117:e0a7df0a9a56 | 29 | LPC_SYSCON->SYSAHBCLKCTRL1 |= (1 << 1); |
mbed_official | 103:9b881da47c92 | 30 | |
mbed_official | 117:e0a7df0a9a56 | 31 | // Clear peripheral reset the RIT |
mbed_official | 117:e0a7df0a9a56 | 32 | LPC_SYSCON->PRESETCTRL1 |= (1 << 1); |
mbed_official | 117:e0a7df0a9a56 | 33 | LPC_SYSCON->PRESETCTRL1 &= ~(1 << 1); |
mbed_official | 103:9b881da47c92 | 34 | |
mbed_official | 117:e0a7df0a9a56 | 35 | LPC_RIT->MASK = 0; |
mbed_official | 117:e0a7df0a9a56 | 36 | LPC_RIT->MASK_H = 0; |
mbed_official | 103:9b881da47c92 | 37 | |
mbed_official | 117:e0a7df0a9a56 | 38 | LPC_RIT->COUNTER = 0; |
mbed_official | 117:e0a7df0a9a56 | 39 | LPC_RIT->COUNTER_H = 0; |
mbed_official | 117:e0a7df0a9a56 | 40 | |
mbed_official | 117:e0a7df0a9a56 | 41 | LPC_RIT->COMPVAL = 0xffffffff; |
mbed_official | 117:e0a7df0a9a56 | 42 | LPC_RIT->COMPVAL_H = 0x0000ffff; |
mbed_official | 117:e0a7df0a9a56 | 43 | |
mbed_official | 117:e0a7df0a9a56 | 44 | // Timer enable, enable for debug |
mbed_official | 117:e0a7df0a9a56 | 45 | LPC_RIT->CTRL = 0xC; |
mbed_official | 103:9b881da47c92 | 46 | |
mbed_official | 103:9b881da47c92 | 47 | NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); |
mbed_official | 103:9b881da47c92 | 48 | NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); |
mbed_official | 103:9b881da47c92 | 49 | } |
mbed_official | 103:9b881da47c92 | 50 | |
mbed_official | 103:9b881da47c92 | 51 | uint32_t us_ticker_read() { |
mbed_official | 103:9b881da47c92 | 52 | if (!us_ticker_inited) |
mbed_official | 103:9b881da47c92 | 53 | us_ticker_init(); |
mbed_official | 103:9b881da47c92 | 54 | |
mbed_official | 117:e0a7df0a9a56 | 55 | uint64_t temp; |
mbed_official | 117:e0a7df0a9a56 | 56 | temp = LPC_RIT->COUNTER | ((uint64_t)LPC_RIT->COUNTER_H << 32); |
mbed_official | 117:e0a7df0a9a56 | 57 | temp /= (SystemCoreClock/1000000); |
mbed_official | 117:e0a7df0a9a56 | 58 | return (uint32_t)temp; |
mbed_official | 103:9b881da47c92 | 59 | } |
mbed_official | 103:9b881da47c92 | 60 | |
mbed_official | 304:89b9c3a9a045 | 61 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
mbed_official | 117:e0a7df0a9a56 | 62 | uint64_t temp = ((uint64_t)timestamp * (SystemCoreClock/1000000)); |
mbed_official | 117:e0a7df0a9a56 | 63 | LPC_RIT->COMPVAL = (temp & 0xFFFFFFFFL); |
mbed_official | 117:e0a7df0a9a56 | 64 | LPC_RIT->COMPVAL_H = ((temp >> 32)& 0x0000FFFFL); |
mbed_official | 103:9b881da47c92 | 65 | } |
mbed_official | 103:9b881da47c92 | 66 | |
mbed_official | 103:9b881da47c92 | 67 | void us_ticker_disable_interrupt(void) { |
mbed_official | 117:e0a7df0a9a56 | 68 | LPC_RIT->CTRL |= (1 << 3); |
mbed_official | 103:9b881da47c92 | 69 | } |
mbed_official | 103:9b881da47c92 | 70 | |
mbed_official | 103:9b881da47c92 | 71 | void us_ticker_clear_interrupt(void) { |
mbed_official | 117:e0a7df0a9a56 | 72 | LPC_RIT->CTRL |= (1 << 0); |
mbed_official | 103:9b881da47c92 | 73 | } |