DongEun Koak / mbed-src

mbed library sources

Dependents:   Freedman_v2 Nucleo_i2c_OLED_BME280_copy

Fork of mbed-src by mbed official

targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c@580:3c14cb9b87c5, 2015-07-02 (annotated)

Committer:
mbed_official
Date:
Thu Jul 02 16:15:09 2015 +0100
Revision:
580:3c14cb9b87c5
Synchronized with git revision 213caf296f26963a7bea129b8ec4f33bbd1e6588



Full URL: https://github.com/mbedmicro/mbed/commit/213caf296f26963a7bea129b8ec4f33bbd1e6588/



commit of mps2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 580:3c14cb9b87c5 1 /* mbed Microcontroller Library
mbed_official 580:3c14cb9b87c5 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 580:3c14cb9b87c5 3 *
mbed_official 580:3c14cb9b87c5 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 580:3c14cb9b87c5 5 * you may not use this file except in compliance with the License.
mbed_official 580:3c14cb9b87c5 6 * You may obtain a copy of the License at
mbed_official 580:3c14cb9b87c5 7 *
mbed_official 580:3c14cb9b87c5 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 580:3c14cb9b87c5 9 *
mbed_official 580:3c14cb9b87c5 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 580:3c14cb9b87c5 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 580:3c14cb9b87c5 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 580:3c14cb9b87c5 13 * See the License for the specific language governing permissions and
mbed_official 580:3c14cb9b87c5 14 * limitations under the License.
mbed_official 580:3c14cb9b87c5 15 */
mbed_official 580:3c14cb9b87c5 16 #include <stddef.h>
mbed_official 580:3c14cb9b87c5 17 #include "us_ticker_api.h"
mbed_official 580:3c14cb9b87c5 18 #include "PeripheralNames.h"
mbed_official 580:3c14cb9b87c5 19
mbed_official 580:3c14cb9b87c5 20 #define US_TICKER_TIMER1 CMSDK_DUALTIMER1
mbed_official 580:3c14cb9b87c5 21 #define US_TICKER_TIMER2 CMSDK_DUALTIMER2
mbed_official 580:3c14cb9b87c5 22 #define US_TICKER_TIMER_IRQn DUALTIMER_IRQn
mbed_official 580:3c14cb9b87c5 23
mbed_official 580:3c14cb9b87c5 24 int us_ticker_inited = 0;
mbed_official 580:3c14cb9b87c5 25
mbed_official 580:3c14cb9b87c5 26 void us_ticker_init(void) {
mbed_official 580:3c14cb9b87c5 27 if (us_ticker_inited) return;
mbed_official 580:3c14cb9b87c5 28 us_ticker_inited = 1;
mbed_official 580:3c14cb9b87c5 29
mbed_official 580:3c14cb9b87c5 30 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
mbed_official 580:3c14cb9b87c5 31 US_TICKER_TIMER2->TimerControl = 0x00; // disable timer
mbed_official 580:3c14cb9b87c5 32 US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF;
mbed_official 580:3c14cb9b87c5 33 US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF;
mbed_official 580:3c14cb9b87c5 34
mbed_official 580:3c14cb9b87c5 35 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
mbed_official 580:3c14cb9b87c5 36 US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter
mbed_official 580:3c14cb9b87c5 37
mbed_official 580:3c14cb9b87c5 38 US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter
mbed_official 580:3c14cb9b87c5 39 US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter
mbed_official 580:3c14cb9b87c5 40
mbed_official 580:3c14cb9b87c5 41 NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
mbed_official 580:3c14cb9b87c5 42 NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
mbed_official 580:3c14cb9b87c5 43 }
mbed_official 580:3c14cb9b87c5 44
mbed_official 580:3c14cb9b87c5 45 uint32_t us_ticker_read() {
mbed_official 580:3c14cb9b87c5 46 uint32_t return_value = 0;
mbed_official 580:3c14cb9b87c5 47 if (!us_ticker_inited)
mbed_official 580:3c14cb9b87c5 48 us_ticker_init();
mbed_official 580:3c14cb9b87c5 49 return_value = ((~US_TICKER_TIMER2->TimerValue)/25);
mbed_official 580:3c14cb9b87c5 50 return return_value;
mbed_official 580:3c14cb9b87c5 51 }
mbed_official 580:3c14cb9b87c5 52
mbed_official 580:3c14cb9b87c5 53 void us_ticker_set_interrupt(timestamp_t timestamp) {
mbed_official 580:3c14cb9b87c5 54 uint32_t timer_value = 0;
mbed_official 580:3c14cb9b87c5 55 int delta = 0;
mbed_official 580:3c14cb9b87c5 56 if (!us_ticker_inited)
mbed_official 580:3c14cb9b87c5 57 us_ticker_init();
mbed_official 580:3c14cb9b87c5 58 delta = (int)(timestamp - us_ticker_read());
mbed_official 580:3c14cb9b87c5 59 if (delta <= 0) {
mbed_official 580:3c14cb9b87c5 60 // This event was in the past:
mbed_official 580:3c14cb9b87c5 61 us_ticker_irq_handler();
mbed_official 580:3c14cb9b87c5 62 return;
mbed_official 580:3c14cb9b87c5 63 }
mbed_official 580:3c14cb9b87c5 64 timer_value = (delta)*25;
mbed_official 580:3c14cb9b87c5 65 // enable interrupt
mbed_official 580:3c14cb9b87c5 66 US_TICKER_TIMER1->TimerControl = 0x0; // disable timer
mbed_official 580:3c14cb9b87c5 67 US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode
mbed_official 580:3c14cb9b87c5 68 US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value
mbed_official 580:3c14cb9b87c5 69 US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer
mbed_official 580:3c14cb9b87c5 70 }
mbed_official 580:3c14cb9b87c5 71
mbed_official 580:3c14cb9b87c5 72 void us_ticker_disable_interrupt(void) {
mbed_official 580:3c14cb9b87c5 73
mbed_official 580:3c14cb9b87c5 74 US_TICKER_TIMER1->TimerControl &= 0xDF;
mbed_official 580:3c14cb9b87c5 75 US_TICKER_TIMER2->TimerControl &= 0xDF;
mbed_official 580:3c14cb9b87c5 76
mbed_official 580:3c14cb9b87c5 77 }
mbed_official 580:3c14cb9b87c5 78
mbed_official 580:3c14cb9b87c5 79 void us_ticker_clear_interrupt(void) {
mbed_official 580:3c14cb9b87c5 80
mbed_official 580:3c14cb9b87c5 81 US_TICKER_TIMER1->TimerIntClr = 0x1;
mbed_official 580:3c14cb9b87c5 82 US_TICKER_TIMER2->TimerIntClr = 0x1;
mbed_official 580:3c14cb9b87c5 83
mbed_official 580:3c14cb9b87c5 84 }