Mouse code for the MacroRat
mbed-dev/targets/TARGET_NXP/TARGET_LPC11UXX/us_ticker.c@18:6a4db94011d3, 2017-05-14 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sun May 14 23:18:57 2017 +0000
- Revision:
- 18:6a4db94011d3
Publishing again
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sahilmgandhi | 18:6a4db94011d3 | 1 | /* mbed Microcontroller Library |
sahilmgandhi | 18:6a4db94011d3 | 2 | * Copyright (c) 2006-2013 ARM Limited |
sahilmgandhi | 18:6a4db94011d3 | 3 | * |
sahilmgandhi | 18:6a4db94011d3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
sahilmgandhi | 18:6a4db94011d3 | 5 | * you may not use this file except in compliance with the License. |
sahilmgandhi | 18:6a4db94011d3 | 6 | * You may obtain a copy of the License at |
sahilmgandhi | 18:6a4db94011d3 | 7 | * |
sahilmgandhi | 18:6a4db94011d3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 9 | * |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Unless required by applicable law or agreed to in writing, software |
sahilmgandhi | 18:6a4db94011d3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
sahilmgandhi | 18:6a4db94011d3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sahilmgandhi | 18:6a4db94011d3 | 13 | * See the License for the specific language governing permissions and |
sahilmgandhi | 18:6a4db94011d3 | 14 | * limitations under the License. |
sahilmgandhi | 18:6a4db94011d3 | 15 | */ |
sahilmgandhi | 18:6a4db94011d3 | 16 | #include <stddef.h> |
sahilmgandhi | 18:6a4db94011d3 | 17 | #include "us_ticker_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 18 | #include "PeripheralNames.h" |
sahilmgandhi | 18:6a4db94011d3 | 19 | |
sahilmgandhi | 18:6a4db94011d3 | 20 | #define US_TICKER_TIMER ((LPC_CTxxBx_Type *)LPC_CT32B1_BASE) |
sahilmgandhi | 18:6a4db94011d3 | 21 | #define US_TICKER_TIMER_IRQn TIMER_32_1_IRQn |
sahilmgandhi | 18:6a4db94011d3 | 22 | |
sahilmgandhi | 18:6a4db94011d3 | 23 | int us_ticker_inited = 0; |
sahilmgandhi | 18:6a4db94011d3 | 24 | |
sahilmgandhi | 18:6a4db94011d3 | 25 | void us_ticker_init(void) { |
sahilmgandhi | 18:6a4db94011d3 | 26 | if (us_ticker_inited) return; |
sahilmgandhi | 18:6a4db94011d3 | 27 | us_ticker_inited = 1; |
sahilmgandhi | 18:6a4db94011d3 | 28 | |
sahilmgandhi | 18:6a4db94011d3 | 29 | LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // Clock TIMER_1 |
sahilmgandhi | 18:6a4db94011d3 | 30 | uint32_t PCLK = SystemCoreClock; |
sahilmgandhi | 18:6a4db94011d3 | 31 | |
sahilmgandhi | 18:6a4db94011d3 | 32 | US_TICKER_TIMER->TCR = 0x2; // reset |
sahilmgandhi | 18:6a4db94011d3 | 33 | |
sahilmgandhi | 18:6a4db94011d3 | 34 | uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) |
sahilmgandhi | 18:6a4db94011d3 | 35 | US_TICKER_TIMER->PR = prescale - 1; |
sahilmgandhi | 18:6a4db94011d3 | 36 | US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 |
sahilmgandhi | 18:6a4db94011d3 | 37 | |
sahilmgandhi | 18:6a4db94011d3 | 38 | NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); |
sahilmgandhi | 18:6a4db94011d3 | 39 | NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 40 | } |
sahilmgandhi | 18:6a4db94011d3 | 41 | |
sahilmgandhi | 18:6a4db94011d3 | 42 | uint32_t us_ticker_read() { |
sahilmgandhi | 18:6a4db94011d3 | 43 | if (!us_ticker_inited) |
sahilmgandhi | 18:6a4db94011d3 | 44 | us_ticker_init(); |
sahilmgandhi | 18:6a4db94011d3 | 45 | |
sahilmgandhi | 18:6a4db94011d3 | 46 | return US_TICKER_TIMER->TC; |
sahilmgandhi | 18:6a4db94011d3 | 47 | } |
sahilmgandhi | 18:6a4db94011d3 | 48 | |
sahilmgandhi | 18:6a4db94011d3 | 49 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
sahilmgandhi | 18:6a4db94011d3 | 50 | // set match value |
sahilmgandhi | 18:6a4db94011d3 | 51 | US_TICKER_TIMER->MR0 = (uint32_t)timestamp; |
sahilmgandhi | 18:6a4db94011d3 | 52 | // enable match interrupt |
sahilmgandhi | 18:6a4db94011d3 | 53 | US_TICKER_TIMER->MCR |= 1; |
sahilmgandhi | 18:6a4db94011d3 | 54 | } |
sahilmgandhi | 18:6a4db94011d3 | 55 | |
sahilmgandhi | 18:6a4db94011d3 | 56 | void us_ticker_disable_interrupt(void) { |
sahilmgandhi | 18:6a4db94011d3 | 57 | US_TICKER_TIMER->MCR &= ~1; |
sahilmgandhi | 18:6a4db94011d3 | 58 | } |
sahilmgandhi | 18:6a4db94011d3 | 59 | |
sahilmgandhi | 18:6a4db94011d3 | 60 | void us_ticker_clear_interrupt(void) { |
sahilmgandhi | 18:6a4db94011d3 | 61 | US_TICKER_TIMER->IR = 1; |
sahilmgandhi | 18:6a4db94011d3 | 62 | } |