Genadi Zawidowski / mbed-dev

mbed library sources. Supersedes mbed-src. Edited target satm32f446 for user USART3 pins

Dependents:   IGLOO_board

Fork of mbed-dev by mbed official

targets/TARGET_NXP/TARGET_LPC43XX/us_ticker.c@188:3f10722804f9, 2018-07-30 (annotated)

Committer:
ua1arn
Date:
Mon Jul 30 12:31:10 2018 +0000
Revision:
188:3f10722804f9
Parent:
174:b96e65c34a4d 
before add multi-configuration USB descriptors

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 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
<> 144:ef7eb2e8f9f7 17 */
<> 144:ef7eb2e8f9f7 18 #include <stddef.h>
<> 144:ef7eb2e8f9f7 19 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 20 #include "PeripheralNames.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #define US_TICKER_TIMER ((LPC_TIMER_T *)LPC_TIMER3_BASE)
<> 144:ef7eb2e8f9f7 23 #define US_TICKER_TIMER_IRQn TIMER3_IRQn
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 int us_ticker_inited = 0;
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 void us_ticker_init(void) {
<> 144:ef7eb2e8f9f7 28 if (us_ticker_inited) return;
<> 144:ef7eb2e8f9f7 29 us_ticker_inited = 1;
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 US_TICKER_TIMER->CTCR = 0x0; // timer mode
<> 144:ef7eb2e8f9f7 32 uint32_t PCLK = SystemCoreClock;
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 US_TICKER_TIMER->TCR = 0x2; // reset
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks)
<> 144:ef7eb2e8f9f7 37 US_TICKER_TIMER->PR = prescale - 1;
<> 144:ef7eb2e8f9f7 38 US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
<> 144:ef7eb2e8f9f7 41 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
<> 144:ef7eb2e8f9f7 42 }
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 uint32_t us_ticker_read() {
<> 144:ef7eb2e8f9f7 45 if (!us_ticker_inited)
<> 144:ef7eb2e8f9f7 46 us_ticker_init();
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 return US_TICKER_TIMER->TC;
<> 144:ef7eb2e8f9f7 49 }
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 void us_ticker_set_interrupt(timestamp_t timestamp) {
<> 144:ef7eb2e8f9f7 52 // set match value
<> 144:ef7eb2e8f9f7 53 US_TICKER_TIMER->MR[0] = (uint32_t)timestamp;
<> 144:ef7eb2e8f9f7 54 // enable match interrupt
<> 144:ef7eb2e8f9f7 55 US_TICKER_TIMER->MCR |= 1;
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57
AnnaBridge 174:b96e65c34a4d 58 void us_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 59 {
AnnaBridge 174:b96e65c34a4d 60 NVIC_SetPendingIRQ(US_TICKER_TIMER_IRQn);
AnnaBridge 174:b96e65c34a4d 61 }
AnnaBridge 174:b96e65c34a4d 62
<> 144:ef7eb2e8f9f7 63 void us_ticker_disable_interrupt(void) {
<> 144:ef7eb2e8f9f7 64 US_TICKER_TIMER->MCR &= ~1;
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 void us_ticker_clear_interrupt(void) {
<> 144:ef7eb2e8f9f7 68 US_TICKER_TIMER->IR = 1;
<> 144:ef7eb2e8f9f7 69 }