ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_NXP/TARGET_LPC408X/us_ticker.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

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group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2006-2013 ARM Limited
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Licensed under the Apache License, Version 2.0 (the "License");
group-onsemi 0:098463de4c5d 5 * you may not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 6 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 11 * distributed under the License is distributed on an "AS IS" BASIS,
group-onsemi 0:098463de4c5d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 13 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 14 * limitations under the License.
group-onsemi 0:098463de4c5d 15 */
group-onsemi 0:098463de4c5d 16 #include <stddef.h>
group-onsemi 0:098463de4c5d 17 #include "us_ticker_api.h"
group-onsemi 0:098463de4c5d 18 #include "PeripheralNames.h"
group-onsemi 0:098463de4c5d 19
group-onsemi 0:098463de4c5d 20 #define US_TICKER_TIMER ((LPC_TIM_TypeDef *)LPC_TIM3_BASE)
group-onsemi 0:098463de4c5d 21 #define US_TICKER_TIMER_IRQn TIMER3_IRQn
group-onsemi 0:098463de4c5d 22
group-onsemi 0:098463de4c5d 23 int us_ticker_inited = 0;
group-onsemi 0:098463de4c5d 24
group-onsemi 0:098463de4c5d 25 void us_ticker_init(void) {
group-onsemi 0:098463de4c5d 26 if (us_ticker_inited) return;
group-onsemi 0:098463de4c5d 27 us_ticker_inited = 1;
group-onsemi 0:098463de4c5d 28
group-onsemi 0:098463de4c5d 29 LPC_SC->PCONP |= 1 << 23; // Clock TIMER_3
group-onsemi 0:098463de4c5d 30
group-onsemi 0:098463de4c5d 31 US_TICKER_TIMER->CTCR = 0x0; // timer mode
group-onsemi 0:098463de4c5d 32 uint32_t PCLK = PeripheralClock;
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 US_TICKER_TIMER->TCR = 0x2; // reset
group-onsemi 0:098463de4c5d 35
group-onsemi 0:098463de4c5d 36 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
group-onsemi 0:098463de4c5d 37 US_TICKER_TIMER->PR = prescale - 1;
group-onsemi 0:098463de4c5d 38 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
group-onsemi 0:098463de4c5d 39
group-onsemi 0:098463de4c5d 40 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
group-onsemi 0:098463de4c5d 41 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
group-onsemi 0:098463de4c5d 42 }
group-onsemi 0:098463de4c5d 43
group-onsemi 0:098463de4c5d 44 uint32_t us_ticker_read() {
group-onsemi 0:098463de4c5d 45 if (!us_ticker_inited)
group-onsemi 0:098463de4c5d 46 us_ticker_init();
group-onsemi 0:098463de4c5d 47
group-onsemi 0:098463de4c5d 48 return US_TICKER_TIMER->TC;
group-onsemi 0:098463de4c5d 49 }
group-onsemi 0:098463de4c5d 50
group-onsemi 0:098463de4c5d 51 void us_ticker_set_interrupt(timestamp_t timestamp) {
group-onsemi 0:098463de4c5d 52 // set match value
group-onsemi 0:098463de4c5d 53 US_TICKER_TIMER->MR0 = (uint32_t)timestamp;
group-onsemi 0:098463de4c5d 54 // enable match interrupt
group-onsemi 0:098463de4c5d 55 US_TICKER_TIMER->MCR |= 1;
group-onsemi 0:098463de4c5d 56 }
group-onsemi 0:098463de4c5d 57
group-onsemi 0:098463de4c5d 58 void us_ticker_disable_interrupt(void) {
group-onsemi 0:098463de4c5d 59 US_TICKER_TIMER->MCR &= ~1;
group-onsemi 0:098463de4c5d 60 }
group-onsemi 0:098463de4c5d 61
group-onsemi 0:098463de4c5d 62 void us_ticker_clear_interrupt(void) {
group-onsemi 0:098463de4c5d 63 US_TICKER_TIMER->IR = 1;
group-onsemi 0:098463de4c5d 64 }