Mouse code for the MacroRat
mbed-dev/targets/TARGET_NXP/TARGET_LPC13XX/us_ticker.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <stddef.h> #include "us_ticker_api.h" #include "PeripheralNames.h" #define US_TICKER_TIMER ((LPC_CT32B1_Type *)LPC_CT32B1_BASE) #define US_TICKER_TIMER_IRQn CT32B1_IRQn int us_ticker_inited = 0; void us_ticker_init(void) { if (us_ticker_inited) return; us_ticker_inited = 1; LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1 uint32_t PCLK = SystemCoreClock; US_TICKER_TIMER->TCR = 0x2; // reset uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) US_TICKER_TIMER->PR = prescale - 1; US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); } uint32_t us_ticker_read() { if (!us_ticker_inited) us_ticker_init(); return US_TICKER_TIMER->TC; } void us_ticker_set_interrupt(timestamp_t timestamp) { // set match value US_TICKER_TIMER->MR0 = (uint32_t)timestamp; // enable match interrupt US_TICKER_TIMER->MCR |= 1; } void us_ticker_disable_interrupt(void) { US_TICKER_TIMER->MCR &= ~1; } void us_ticker_clear_interrupt(void) { US_TICKER_TIMER->IR = 1; }