b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_NXP/TARGET_LPC13XX/us_ticker.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
149:156823d33999 
stuff changed?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include <stddef.h>
<> 144:ef7eb2e8f9f7 17 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 18 #include "PeripheralNames.h"
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 #define US_TICKER_TIMER ((LPC_CT32B1_Type *)LPC_CT32B1_BASE)
<> 144:ef7eb2e8f9f7 21 #define US_TICKER_TIMER_IRQn CT32B1_IRQn
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 int us_ticker_inited = 0;
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 void us_ticker_init(void) {
<> 144:ef7eb2e8f9f7 26 if (us_ticker_inited) return;
<> 144:ef7eb2e8f9f7 27 us_ticker_inited = 1;
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1
<> 144:ef7eb2e8f9f7 30 uint32_t PCLK = SystemCoreClock;
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 US_TICKER_TIMER->TCR = 0x2; // reset
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
<> 144:ef7eb2e8f9f7 35 US_TICKER_TIMER->PR = prescale - 1;
<> 144:ef7eb2e8f9f7 36 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
<> 144:ef7eb2e8f9f7 39 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
<> 144:ef7eb2e8f9f7 40 }
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 uint32_t us_ticker_read() {
<> 144:ef7eb2e8f9f7 43 if (!us_ticker_inited)
<> 144:ef7eb2e8f9f7 44 us_ticker_init();
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 return US_TICKER_TIMER->TC;
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 void us_ticker_set_interrupt(timestamp_t timestamp) {
<> 144:ef7eb2e8f9f7 50 // set match value
<> 144:ef7eb2e8f9f7 51 US_TICKER_TIMER->MR0 = (uint32_t)timestamp;
<> 144:ef7eb2e8f9f7 52 // enable match interrupt
<> 144:ef7eb2e8f9f7 53 US_TICKER_TIMER->MCR |= 1;
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 void us_ticker_disable_interrupt(void) {
<> 144:ef7eb2e8f9f7 57 US_TICKER_TIMER->MCR &= ~1;
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void us_ticker_clear_interrupt(void) {
<> 144:ef7eb2e8f9f7 61 US_TICKER_TIMER->IR = 1;
<> 144:ef7eb2e8f9f7 62 }