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Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX/us_ticker.c@19:398f4c622e1b, 2013-08-19 (annotated)

Committer:
bogdanm
Date:
Mon Aug 19 18:17:02 2013 +0300
Revision:
19:398f4c622e1b
Sync with official mbed library release 66

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 19:398f4c622e1b 1 /* mbed Microcontroller Library
bogdanm 19:398f4c622e1b 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 19:398f4c622e1b 3 *
bogdanm 19:398f4c622e1b 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 19:398f4c622e1b 5 * you may not use this file except in compliance with the License.
bogdanm 19:398f4c622e1b 6 * You may obtain a copy of the License at
bogdanm 19:398f4c622e1b 7 *
bogdanm 19:398f4c622e1b 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 19:398f4c622e1b 9 *
bogdanm 19:398f4c622e1b 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 19:398f4c622e1b 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 19:398f4c622e1b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 19:398f4c622e1b 13 * See the License for the specific language governing permissions and
bogdanm 19:398f4c622e1b 14 * limitations under the License.
bogdanm 19:398f4c622e1b 15 */
bogdanm 19:398f4c622e1b 16 #include <stddef.h>
bogdanm 19:398f4c622e1b 17 #include "us_ticker_api.h"
bogdanm 19:398f4c622e1b 18 #include "PeripheralNames.h"
bogdanm 19:398f4c622e1b 19
bogdanm 19:398f4c622e1b 20 #define US_TICKER_TIMER ((LPC_TMR_TypeDef *)LPC_CT32B1_BASE)
bogdanm 19:398f4c622e1b 21 #define US_TICKER_TIMER_IRQn TIMER_32_1_IRQn
bogdanm 19:398f4c622e1b 22
bogdanm 19:398f4c622e1b 23 int us_ticker_inited = 0;
bogdanm 19:398f4c622e1b 24
bogdanm 19:398f4c622e1b 25 void us_ticker_init(void) {
bogdanm 19:398f4c622e1b 26 if (us_ticker_inited) return;
bogdanm 19:398f4c622e1b 27 us_ticker_inited = 1;
bogdanm 19:398f4c622e1b 28
bogdanm 19:398f4c622e1b 29 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1
bogdanm 19:398f4c622e1b 30 uint32_t PCLK = SystemCoreClock;
bogdanm 19:398f4c622e1b 31
bogdanm 19:398f4c622e1b 32 US_TICKER_TIMER->TCR = 0x2; // reset
bogdanm 19:398f4c622e1b 33
bogdanm 19:398f4c622e1b 34 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
bogdanm 19:398f4c622e1b 35 US_TICKER_TIMER->PR = prescale - 1;
bogdanm 19:398f4c622e1b 36 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
bogdanm 19:398f4c622e1b 37
bogdanm 19:398f4c622e1b 38 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
bogdanm 19:398f4c622e1b 39 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
bogdanm 19:398f4c622e1b 40 }
bogdanm 19:398f4c622e1b 41
bogdanm 19:398f4c622e1b 42 uint32_t us_ticker_read() {
bogdanm 19:398f4c622e1b 43 if (!us_ticker_inited)
bogdanm 19:398f4c622e1b 44 us_ticker_init();
bogdanm 19:398f4c622e1b 45
bogdanm 19:398f4c622e1b 46 return US_TICKER_TIMER->TC;
bogdanm 19:398f4c622e1b 47 }
bogdanm 19:398f4c622e1b 48
bogdanm 19:398f4c622e1b 49 void us_ticker_set_interrupt(unsigned int timestamp) {
bogdanm 19:398f4c622e1b 50 // set match value
bogdanm 19:398f4c622e1b 51 US_TICKER_TIMER->MR0 = timestamp;
bogdanm 19:398f4c622e1b 52 // enable match interrupt
bogdanm 19:398f4c622e1b 53 US_TICKER_TIMER->MCR |= 1;
bogdanm 19:398f4c622e1b 54 }
bogdanm 19:398f4c622e1b 55
bogdanm 19:398f4c622e1b 56 void us_ticker_disable_interrupt(void) {
bogdanm 19:398f4c622e1b 57 US_TICKER_TIMER->MCR &= ~1;
bogdanm 19:398f4c622e1b 58 }
bogdanm 19:398f4c622e1b 59
bogdanm 19:398f4c622e1b 60 void us_ticker_clear_interrupt(void) {
bogdanm 19:398f4c622e1b 61 US_TICKER_TIMER->IR = 1;
bogdanm 19:398f4c622e1b 62 }