zain aftab / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC13XX/us_ticker.c@636:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
636:a11c0372f0ba
Parent:
304:89b9c3a9a045 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #include <stddef.h>
bogdanm 13:0645d8841f51 17 #include "us_ticker_api.h"
bogdanm 13:0645d8841f51 18 #include "PeripheralNames.h"
bogdanm 13:0645d8841f51 19
bogdanm 13:0645d8841f51 20 #define US_TICKER_TIMER ((LPC_CT32B1_Type *)LPC_CT32B1_BASE)
bogdanm 13:0645d8841f51 21 #define US_TICKER_TIMER_IRQn CT32B1_IRQn
bogdanm 13:0645d8841f51 22
bogdanm 13:0645d8841f51 23 int us_ticker_inited = 0;
bogdanm 13:0645d8841f51 24
bogdanm 13:0645d8841f51 25 void us_ticker_init(void) {
bogdanm 13:0645d8841f51 26 if (us_ticker_inited) return;
bogdanm 13:0645d8841f51 27 us_ticker_inited = 1;
bogdanm 13:0645d8841f51 28
bogdanm 13:0645d8841f51 29 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1
bogdanm 13:0645d8841f51 30 uint32_t PCLK = SystemCoreClock;
bogdanm 13:0645d8841f51 31
bogdanm 13:0645d8841f51 32 US_TICKER_TIMER->TCR = 0x2; // reset
bogdanm 13:0645d8841f51 33
bogdanm 13:0645d8841f51 34 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
bogdanm 13:0645d8841f51 35 US_TICKER_TIMER->PR = prescale - 1;
bogdanm 13:0645d8841f51 36 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
bogdanm 13:0645d8841f51 37
bogdanm 13:0645d8841f51 38 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
bogdanm 13:0645d8841f51 39 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
bogdanm 13:0645d8841f51 40 }
bogdanm 13:0645d8841f51 41
bogdanm 13:0645d8841f51 42 uint32_t us_ticker_read() {
bogdanm 13:0645d8841f51 43 if (!us_ticker_inited)
bogdanm 13:0645d8841f51 44 us_ticker_init();
bogdanm 13:0645d8841f51 45
bogdanm 13:0645d8841f51 46 return US_TICKER_TIMER->TC;
bogdanm 13:0645d8841f51 47 }
bogdanm 13:0645d8841f51 48
mbed_official 304:89b9c3a9a045 49 void us_ticker_set_interrupt(timestamp_t timestamp) {
bogdanm 13:0645d8841f51 50 // set match value
mbed_official 304:89b9c3a9a045 51 US_TICKER_TIMER->MR0 = (uint32_t)timestamp;
bogdanm 13:0645d8841f51 52 // enable match interrupt
bogdanm 13:0645d8841f51 53 US_TICKER_TIMER->MCR |= 1;
bogdanm 13:0645d8841f51 54 }
bogdanm 13:0645d8841f51 55
bogdanm 13:0645d8841f51 56 void us_ticker_disable_interrupt(void) {
bogdanm 13:0645d8841f51 57 US_TICKER_TIMER->MCR &= ~1;
bogdanm 13:0645d8841f51 58 }
bogdanm 13:0645d8841f51 59
bogdanm 13:0645d8841f51 60 void us_ticker_clear_interrupt(void) {
bogdanm 13:0645d8841f51 61 US_TICKER_TIMER->IR = 1;
bogdanm 13:0645d8841f51 62 }