Fawwaz Nadzmy / mbed-STM

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include <stddef.h>
bogdanm 0:9b334a45a8ff 17 #include "us_ticker_api.h"
bogdanm 0:9b334a45a8ff 18 #include "PeripheralNames.h"
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 #define US_TICKER_TIMER_IRQn RIT_IRQn
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 int us_ticker_inited = 0;
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 void us_ticker_init(void) {
bogdanm 0:9b334a45a8ff 25 if (us_ticker_inited) return;
bogdanm 0:9b334a45a8ff 26 us_ticker_inited = 1;
bogdanm 0:9b334a45a8ff 27
bogdanm 0:9b334a45a8ff 28 // Enable the RIT clock
bogdanm 0:9b334a45a8ff 29 LPC_SYSCON->SYSAHBCLKCTRL1 |= (1 << 1);
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 // Clear peripheral reset the RIT
bogdanm 0:9b334a45a8ff 32 LPC_SYSCON->PRESETCTRL1 |= (1 << 1);
bogdanm 0:9b334a45a8ff 33 LPC_SYSCON->PRESETCTRL1 &= ~(1 << 1);
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 LPC_RIT->MASK = 0;
bogdanm 0:9b334a45a8ff 36 LPC_RIT->MASK_H = 0;
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 LPC_RIT->COUNTER = 0;
bogdanm 0:9b334a45a8ff 39 LPC_RIT->COUNTER_H = 0;
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 LPC_RIT->COMPVAL = 0xffffffff;
bogdanm 0:9b334a45a8ff 42 LPC_RIT->COMPVAL_H = 0x0000ffff;
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 // Timer enable, enable for debug
bogdanm 0:9b334a45a8ff 45 LPC_RIT->CTRL = 0xC;
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
bogdanm 0:9b334a45a8ff 48 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
bogdanm 0:9b334a45a8ff 49 }
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 uint32_t us_ticker_read() {
bogdanm 0:9b334a45a8ff 52 if (!us_ticker_inited)
bogdanm 0:9b334a45a8ff 53 us_ticker_init();
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 uint64_t temp;
bogdanm 0:9b334a45a8ff 56 temp = LPC_RIT->COUNTER | ((uint64_t)LPC_RIT->COUNTER_H << 32);
bogdanm 0:9b334a45a8ff 57 temp /= (SystemCoreClock/1000000);
bogdanm 0:9b334a45a8ff 58 return (uint32_t)temp;
bogdanm 0:9b334a45a8ff 59 }
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 void us_ticker_set_interrupt(timestamp_t timestamp) {
bogdanm 0:9b334a45a8ff 62 uint64_t temp = ((uint64_t)timestamp * (SystemCoreClock/1000000));
bogdanm 0:9b334a45a8ff 63 LPC_RIT->COMPVAL = (temp & 0xFFFFFFFFL);
bogdanm 0:9b334a45a8ff 64 LPC_RIT->COMPVAL_H = ((temp >> 32)& 0x0000FFFFL);
bogdanm 0:9b334a45a8ff 65 }
bogdanm 0:9b334a45a8ff 66
bogdanm 0:9b334a45a8ff 67 void us_ticker_disable_interrupt(void) {
bogdanm 0:9b334a45a8ff 68 LPC_RIT->CTRL |= (1 << 3);
bogdanm 0:9b334a45a8ff 69 }
bogdanm 0:9b334a45a8ff 70
bogdanm 0:9b334a45a8ff 71 void us_ticker_clear_interrupt(void) {
bogdanm 0:9b334a45a8ff 72 LPC_RIT->CTRL |= (1 << 0);
bogdanm 0:9b334a45a8ff 73 }