mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/us_ticker.c@310:6188e0254baa, 2014-09-16 (annotated)
- Committer:
- janekm
- Date:
- Tue Sep 16 22:42:01 2014 +0000
- Revision:
- 310:6188e0254baa
- Parent:
- 305:89b9c3a9a045
N/A
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 30:91c1d09ada54 | 1 | /* mbed Microcontroller Library |
mbed_official | 30:91c1d09ada54 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 30:91c1d09ada54 | 3 | * |
mbed_official | 30:91c1d09ada54 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 30:91c1d09ada54 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 30:91c1d09ada54 | 6 | * You may obtain a copy of the License at |
mbed_official | 30:91c1d09ada54 | 7 | * |
mbed_official | 30:91c1d09ada54 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 30:91c1d09ada54 | 9 | * |
mbed_official | 30:91c1d09ada54 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 30:91c1d09ada54 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 30:91c1d09ada54 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 30:91c1d09ada54 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 30:91c1d09ada54 | 14 | * limitations under the License. |
mbed_official | 30:91c1d09ada54 | 15 | */ |
mbed_official | 30:91c1d09ada54 | 16 | #include <stddef.h> |
mbed_official | 30:91c1d09ada54 | 17 | #include "us_ticker_api.h" |
mbed_official | 30:91c1d09ada54 | 18 | #include "PeripheralNames.h" |
mbed_official | 30:91c1d09ada54 | 19 | |
mbed_official | 30:91c1d09ada54 | 20 | #define US_TICKER_TIMER ((LPC_TMR_TypeDef *)LPC_CT32B1_BASE) |
mbed_official | 30:91c1d09ada54 | 21 | #define US_TICKER_TIMER_IRQn TIMER_32_1_IRQn |
mbed_official | 30:91c1d09ada54 | 22 | |
mbed_official | 30:91c1d09ada54 | 23 | int us_ticker_inited = 0; |
mbed_official | 30:91c1d09ada54 | 24 | |
mbed_official | 30:91c1d09ada54 | 25 | void us_ticker_init(void) { |
mbed_official | 30:91c1d09ada54 | 26 | if (us_ticker_inited) return; |
mbed_official | 30:91c1d09ada54 | 27 | us_ticker_inited = 1; |
mbed_official | 30:91c1d09ada54 | 28 | |
mbed_official | 30:91c1d09ada54 | 29 | LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1 |
mbed_official | 30:91c1d09ada54 | 30 | uint32_t PCLK = SystemCoreClock; |
mbed_official | 30:91c1d09ada54 | 31 | |
mbed_official | 30:91c1d09ada54 | 32 | US_TICKER_TIMER->TCR = 0x2; // reset |
mbed_official | 30:91c1d09ada54 | 33 | |
mbed_official | 30:91c1d09ada54 | 34 | uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) |
mbed_official | 30:91c1d09ada54 | 35 | US_TICKER_TIMER->PR = prescale - 1; |
mbed_official | 30:91c1d09ada54 | 36 | US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 |
mbed_official | 30:91c1d09ada54 | 37 | |
mbed_official | 30:91c1d09ada54 | 38 | NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); |
mbed_official | 30:91c1d09ada54 | 39 | NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); |
mbed_official | 30:91c1d09ada54 | 40 | } |
mbed_official | 30:91c1d09ada54 | 41 | |
mbed_official | 30:91c1d09ada54 | 42 | uint32_t us_ticker_read() { |
mbed_official | 30:91c1d09ada54 | 43 | if (!us_ticker_inited) |
mbed_official | 30:91c1d09ada54 | 44 | us_ticker_init(); |
mbed_official | 30:91c1d09ada54 | 45 | |
mbed_official | 30:91c1d09ada54 | 46 | return US_TICKER_TIMER->TC; |
mbed_official | 30:91c1d09ada54 | 47 | } |
mbed_official | 30:91c1d09ada54 | 48 | |
mbed_official | 305:89b9c3a9a045 | 49 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
mbed_official | 30:91c1d09ada54 | 50 | // set match value |
mbed_official | 305:89b9c3a9a045 | 51 | US_TICKER_TIMER->MR0 = (uint32_t)timestamp; |
mbed_official | 30:91c1d09ada54 | 52 | // enable match interrupt |
mbed_official | 30:91c1d09ada54 | 53 | US_TICKER_TIMER->MCR |= 1; |
mbed_official | 30:91c1d09ada54 | 54 | } |
mbed_official | 30:91c1d09ada54 | 55 | |
mbed_official | 30:91c1d09ada54 | 56 | void us_ticker_disable_interrupt(void) { |
mbed_official | 30:91c1d09ada54 | 57 | US_TICKER_TIMER->MCR &= ~1; |
mbed_official | 30:91c1d09ada54 | 58 | } |
mbed_official | 30:91c1d09ada54 | 59 | |
mbed_official | 30:91c1d09ada54 | 60 | void us_ticker_clear_interrupt(void) { |
mbed_official | 30:91c1d09ada54 | 61 | US_TICKER_TIMER->IR = 1; |
mbed_official | 30:91c1d09ada54 | 62 | } |