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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c@117:e0a7df0a9a56, 2014-03-12 (annotated)

Committer:
mbed_official
Date:
Wed Mar 12 10:30:07 2014 +0000
Revision:
117:e0a7df0a9a56
Parent:
103:9b881da47c92
Child:
304:89b9c3a9a045
Synchronized with git revision 6b2f3120cfef5765bc1bade48c495873f627f9bc



Full URL: https://github.com/mbedmicro/mbed/commit/6b2f3120cfef5765bc1bade48c495873f627f9bc/



[LPC1549] Added AnalogOut API and PWM improvement

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 103:9b881da47c92 1 /* mbed Microcontroller Library
mbed_official 103:9b881da47c92 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 103:9b881da47c92 3 *
mbed_official 103:9b881da47c92 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 103:9b881da47c92 5 * you may not use this file except in compliance with the License.
mbed_official 103:9b881da47c92 6 * You may obtain a copy of the License at
mbed_official 103:9b881da47c92 7 *
mbed_official 103:9b881da47c92 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 103:9b881da47c92 9 *
mbed_official 103:9b881da47c92 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 103:9b881da47c92 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 103:9b881da47c92 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 103:9b881da47c92 13 * See the License for the specific language governing permissions and
mbed_official 103:9b881da47c92 14 * limitations under the License.
mbed_official 103:9b881da47c92 15 */
mbed_official 103:9b881da47c92 16 #include <stddef.h>
mbed_official 103:9b881da47c92 17 #include "us_ticker_api.h"
mbed_official 103:9b881da47c92 18 #include "PeripheralNames.h"
mbed_official 103:9b881da47c92 19
mbed_official 117:e0a7df0a9a56 20 #define US_TICKER_TIMER_IRQn RIT_IRQn
mbed_official 103:9b881da47c92 21
mbed_official 103:9b881da47c92 22 int us_ticker_inited = 0;
mbed_official 103:9b881da47c92 23
mbed_official 103:9b881da47c92 24 void us_ticker_init(void) {
mbed_official 103:9b881da47c92 25 if (us_ticker_inited) return;
mbed_official 103:9b881da47c92 26 us_ticker_inited = 1;
mbed_official 103:9b881da47c92 27
mbed_official 117:e0a7df0a9a56 28 // Enable the RIT clock
mbed_official 117:e0a7df0a9a56 29 LPC_SYSCON->SYSAHBCLKCTRL1 |= (1 << 1);
mbed_official 103:9b881da47c92 30
mbed_official 117:e0a7df0a9a56 31 // Clear peripheral reset the RIT
mbed_official 117:e0a7df0a9a56 32 LPC_SYSCON->PRESETCTRL1 |= (1 << 1);
mbed_official 117:e0a7df0a9a56 33 LPC_SYSCON->PRESETCTRL1 &= ~(1 << 1);
mbed_official 103:9b881da47c92 34
mbed_official 117:e0a7df0a9a56 35 LPC_RIT->MASK = 0;
mbed_official 117:e0a7df0a9a56 36 LPC_RIT->MASK_H = 0;
mbed_official 103:9b881da47c92 37
mbed_official 117:e0a7df0a9a56 38 LPC_RIT->COUNTER = 0;
mbed_official 117:e0a7df0a9a56 39 LPC_RIT->COUNTER_H = 0;
mbed_official 117:e0a7df0a9a56 40
mbed_official 117:e0a7df0a9a56 41 LPC_RIT->COMPVAL = 0xffffffff;
mbed_official 117:e0a7df0a9a56 42 LPC_RIT->COMPVAL_H = 0x0000ffff;
mbed_official 117:e0a7df0a9a56 43
mbed_official 117:e0a7df0a9a56 44 // Timer enable, enable for debug
mbed_official 117:e0a7df0a9a56 45 LPC_RIT->CTRL = 0xC;
mbed_official 103:9b881da47c92 46
mbed_official 103:9b881da47c92 47 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
mbed_official 103:9b881da47c92 48 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
mbed_official 103:9b881da47c92 49 }
mbed_official 103:9b881da47c92 50
mbed_official 103:9b881da47c92 51 uint32_t us_ticker_read() {
mbed_official 103:9b881da47c92 52 if (!us_ticker_inited)
mbed_official 103:9b881da47c92 53 us_ticker_init();
mbed_official 103:9b881da47c92 54
mbed_official 117:e0a7df0a9a56 55 uint64_t temp;
mbed_official 117:e0a7df0a9a56 56 temp = LPC_RIT->COUNTER | ((uint64_t)LPC_RIT->COUNTER_H << 32);
mbed_official 117:e0a7df0a9a56 57 temp /= (SystemCoreClock/1000000);
mbed_official 117:e0a7df0a9a56 58 return (uint32_t)temp;
mbed_official 103:9b881da47c92 59 }
mbed_official 103:9b881da47c92 60
mbed_official 103:9b881da47c92 61 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 117:e0a7df0a9a56 62 uint64_t temp = ((uint64_t)timestamp * (SystemCoreClock/1000000));
mbed_official 117:e0a7df0a9a56 63 LPC_RIT->COMPVAL = (temp & 0xFFFFFFFFL);
mbed_official 117:e0a7df0a9a56 64 LPC_RIT->COMPVAL_H = ((temp >> 32)& 0x0000FFFFL);
mbed_official 103:9b881da47c92 65 }
mbed_official 103:9b881da47c92 66
mbed_official 103:9b881da47c92 67 void us_ticker_disable_interrupt(void) {
mbed_official 117:e0a7df0a9a56 68 LPC_RIT->CTRL |= (1 << 3);
mbed_official 103:9b881da47c92 69 }
mbed_official 103:9b881da47c92 70
mbed_official 103:9b881da47c92 71 void us_ticker_clear_interrupt(void) {
mbed_official 117:e0a7df0a9a56 72 LPC_RIT->CTRL |= (1 << 0);
mbed_official 103:9b881da47c92 73 }