mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC43XX/us_ticker.c
- Committer:
- mbed_official
- Date:
- 2014-08-27
- Revision:
- 300:55638feb26a4
- Parent:
- 294:78f9587bb26d
- Child:
- 304:89b9c3a9a045
File content as of revision 300:55638feb26a4:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> */ #include <stddef.h> #include "us_ticker_api.h" #include "PeripheralNames.h" #define US_TICKER_TIMER ((LPC_TIMER_T *)LPC_TIMER3_BASE) #define US_TICKER_TIMER_IRQn TIMER3_IRQn int us_ticker_inited = 0; void us_ticker_init(void) { if (us_ticker_inited) return; us_ticker_inited = 1; US_TICKER_TIMER->CTCR = 0x0; // timer mode uint32_t PCLK = SystemCoreClock; US_TICKER_TIMER->TCR = 0x2; // reset uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) US_TICKER_TIMER->PR = prescale - 1; US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); } uint32_t us_ticker_read() { if (!us_ticker_inited) us_ticker_init(); return US_TICKER_TIMER->TC; } void us_ticker_set_interrupt(unsigned int timestamp) { // set match value US_TICKER_TIMER->MR[0] = timestamp; // enable match interrupt US_TICKER_TIMER->MCR |= 1; } void us_ticker_disable_interrupt(void) { US_TICKER_TIMER->MCR &= ~1; } void us_ticker_clear_interrupt(void) { US_TICKER_TIMER->IR = 1; }