Paul Paterson / mbed-src-CanNucleoF0

mbed library sources, include can_api for nucleo-f091rc

Dependents:   CanNucleoF0_example

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/us_ticker.c@645:13c87cbecd54, 2016-01-07 (annotated)

Committer:
ptpaterson
Date:
Thu Jan 07 05:49:05 2016 +0000
Revision:
645:13c87cbecd54
Parent:
304:89b9c3a9a045 
corrected freeze on CAN_RECEIVE_IT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 30:91c1d09ada54 1 /* mbed Microcontroller Library
mbed_official 30:91c1d09ada54 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 30:91c1d09ada54 3 *
mbed_official 30:91c1d09ada54 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 30:91c1d09ada54 5 * you may not use this file except in compliance with the License.
mbed_official 30:91c1d09ada54 6 * You may obtain a copy of the License at
mbed_official 30:91c1d09ada54 7 *
mbed_official 30:91c1d09ada54 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 30:91c1d09ada54 9 *
mbed_official 30:91c1d09ada54 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 30:91c1d09ada54 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 30:91c1d09ada54 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 30:91c1d09ada54 13 * See the License for the specific language governing permissions and
mbed_official 30:91c1d09ada54 14 * limitations under the License.
mbed_official 30:91c1d09ada54 15 */
mbed_official 30:91c1d09ada54 16 #include <stddef.h>
mbed_official 30:91c1d09ada54 17 #include "us_ticker_api.h"
mbed_official 30:91c1d09ada54 18 #include "PeripheralNames.h"
mbed_official 30:91c1d09ada54 19
mbed_official 30:91c1d09ada54 20 #define US_TICKER_TIMER ((LPC_TMR_TypeDef *)LPC_CT32B1_BASE)
mbed_official 30:91c1d09ada54 21 #define US_TICKER_TIMER_IRQn TIMER_32_1_IRQn
mbed_official 30:91c1d09ada54 22
mbed_official 30:91c1d09ada54 23 int us_ticker_inited = 0;
mbed_official 30:91c1d09ada54 24
mbed_official 30:91c1d09ada54 25 void us_ticker_init(void) {
mbed_official 30:91c1d09ada54 26 if (us_ticker_inited) return;
mbed_official 30:91c1d09ada54 27 us_ticker_inited = 1;
mbed_official 30:91c1d09ada54 28
mbed_official 30:91c1d09ada54 29 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1
mbed_official 30:91c1d09ada54 30 uint32_t PCLK = SystemCoreClock;
mbed_official 30:91c1d09ada54 31
mbed_official 30:91c1d09ada54 32 US_TICKER_TIMER->TCR = 0x2; // reset
mbed_official 30:91c1d09ada54 33
mbed_official 30:91c1d09ada54 34 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
mbed_official 30:91c1d09ada54 35 US_TICKER_TIMER->PR = prescale - 1;
mbed_official 30:91c1d09ada54 36 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
mbed_official 30:91c1d09ada54 37
mbed_official 30:91c1d09ada54 38 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
mbed_official 30:91c1d09ada54 39 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
mbed_official 30:91c1d09ada54 40 }
mbed_official 30:91c1d09ada54 41
mbed_official 30:91c1d09ada54 42 uint32_t us_ticker_read() {
mbed_official 30:91c1d09ada54 43 if (!us_ticker_inited)
mbed_official 30:91c1d09ada54 44 us_ticker_init();
mbed_official 30:91c1d09ada54 45
mbed_official 30:91c1d09ada54 46 return US_TICKER_TIMER->TC;
mbed_official 30:91c1d09ada54 47 }
mbed_official 30:91c1d09ada54 48
mbed_official 304:89b9c3a9a045 49 void us_ticker_set_interrupt(timestamp_t timestamp) {
mbed_official 30:91c1d09ada54 50 // set match value
mbed_official 304:89b9c3a9a045 51 US_TICKER_TIMER->MR0 = (uint32_t)timestamp;
mbed_official 30:91c1d09ada54 52 // enable match interrupt
mbed_official 30:91c1d09ada54 53 US_TICKER_TIMER->MCR |= 1;
mbed_official 30:91c1d09ada54 54 }
mbed_official 30:91c1d09ada54 55
mbed_official 30:91c1d09ada54 56 void us_ticker_disable_interrupt(void) {
mbed_official 30:91c1d09ada54 57 US_TICKER_TIMER->MCR &= ~1;
mbed_official 30:91c1d09ada54 58 }
mbed_official 30:91c1d09ada54 59
mbed_official 30:91c1d09ada54 60 void us_ticker_clear_interrupt(void) {
mbed_official 30:91c1d09ada54 61 US_TICKER_TIMER->IR = 1;
mbed_official 30:91c1d09ada54 62 }