mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_ARM_SSG/TARGET_BEETLE/us_ticker.c@174:b96e65c34a4d, 2017-10-02 (annotated)

Committer:
AnnaBridge
Date:
Mon Oct 02 15:33:19 2017 +0100
Revision:
174:b96e65c34a4d
Parent:
149:156823d33999
Child:
182:a56a73fd2a6f
This updates the lib to the mbed lib v 152

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015 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 #include <stddef.h>
<> 144:ef7eb2e8f9f7 17 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 18 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 19 #include "PeripheralNames.h"
<> 144:ef7eb2e8f9f7 20 /* Private data */
<> 144:ef7eb2e8f9f7 21 /* us_ticker reload value */
<> 144:ef7eb2e8f9f7 22 static uint32_t us_ticker_reload = 0x0; /* Max Value */
<> 144:ef7eb2e8f9f7 23 /* us ticker initialized */
<> 144:ef7eb2e8f9f7 24 static uint32_t us_ticker_inited = 0;
<> 144:ef7eb2e8f9f7 25 /* us ticker overflow */
<> 144:ef7eb2e8f9f7 26 static uint32_t us_ticker_overflow_delta = 0;
<> 144:ef7eb2e8f9f7 27 /* us ticker overflow limit */
<> 144:ef7eb2e8f9f7 28 static uint32_t us_ticker_overflow_limit = 0;
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 void __us_ticker_irq_handler(void) {
<> 144:ef7eb2e8f9f7 31 Timer_ClearInterrupt(TIMER1);
<> 144:ef7eb2e8f9f7 32 /*
<> 144:ef7eb2e8f9f7 33 * For each overflow event adds the timer max represented value to
<> 144:ef7eb2e8f9f7 34 * the delta. This allows the us_ticker to keep track of the elapsed
<> 144:ef7eb2e8f9f7 35 * time:
<> 144:ef7eb2e8f9f7 36 * elapsed_time = (num_overflow * overflow_limit) + current_time
<> 144:ef7eb2e8f9f7 37 */
<> 144:ef7eb2e8f9f7 38 us_ticker_overflow_delta += us_ticker_overflow_limit;
<> 144:ef7eb2e8f9f7 39 }
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 void us_ticker_init(void) {
<> 144:ef7eb2e8f9f7 42 uint32_t us_ticker_irqn0 = 0;
<> 144:ef7eb2e8f9f7 43 uint32_t us_ticker_irqn1 = 0;
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 if (us_ticker_inited)
<> 144:ef7eb2e8f9f7 46 return;
<> 144:ef7eb2e8f9f7 47 us_ticker_inited = 1;
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /* Initialize Timer 0 */
<> 144:ef7eb2e8f9f7 50 Timer_Initialize(TIMER0, us_ticker_reload);
<> 144:ef7eb2e8f9f7 51 /* Enable Timer 0 */
<> 144:ef7eb2e8f9f7 52 Timer_Enable(TIMER0);
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 /* Initialize Timer 1 */
<> 144:ef7eb2e8f9f7 55 Timer_Initialize(TIMER1, us_ticker_reload);
<> 144:ef7eb2e8f9f7 56 /* Enable Timer 1 */
<> 144:ef7eb2e8f9f7 57 Timer_Enable(TIMER1);
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 /* Timer 0 get IRQn */
<> 144:ef7eb2e8f9f7 60 us_ticker_irqn0 = Timer_GetIRQn(TIMER0);
<> 144:ef7eb2e8f9f7 61 NVIC_SetVector((IRQn_Type)us_ticker_irqn0, (uint32_t)us_ticker_irq_handler);
<> 144:ef7eb2e8f9f7 62 NVIC_EnableIRQ((IRQn_Type)us_ticker_irqn0);
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 /* Timer 1 get IRQn */
<> 144:ef7eb2e8f9f7 65 us_ticker_irqn1 = Timer_GetIRQn(TIMER1);
<> 144:ef7eb2e8f9f7 66 NVIC_SetVector((IRQn_Type)us_ticker_irqn1, (uint32_t)__us_ticker_irq_handler);
<> 144:ef7eb2e8f9f7 67 NVIC_EnableIRQ((IRQn_Type)us_ticker_irqn1);
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 /* Timer set interrupt on TIMER1 */
<> 144:ef7eb2e8f9f7 70 Timer_SetInterrupt(TIMER1, TIMER_DEFAULT_RELOAD);
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 /*
<> 144:ef7eb2e8f9f7 73 * Set us_ticker Overflow limit. The us_ticker overflow limit is required
<> 144:ef7eb2e8f9f7 74 * to calculated the return value of the us_ticker read function in us
<> 144:ef7eb2e8f9f7 75 * on 32bit.
<> 144:ef7eb2e8f9f7 76 * A 32bit us value cannot be represented directly in the Timer Load
<> 144:ef7eb2e8f9f7 77 * register if it is greater than (0xFFFFFFFF ticks)/TIMER_DIVIDER_US.
<> 144:ef7eb2e8f9f7 78 */
<> 144:ef7eb2e8f9f7 79 us_ticker_overflow_limit = Timer_GetReloadValue(TIMER1);
<> 144:ef7eb2e8f9f7 80 }
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 uint32_t us_ticker_read() {
<> 144:ef7eb2e8f9f7 83 uint32_t return_value = 0;
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 if (!us_ticker_inited)
<> 144:ef7eb2e8f9f7 86 us_ticker_init();
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 return_value = us_ticker_overflow_delta + Timer_Read(TIMER1);
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 return return_value;
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 void us_ticker_set_interrupt(timestamp_t timestamp) {
<> 144:ef7eb2e8f9f7 94 if (!us_ticker_inited)
<> 144:ef7eb2e8f9f7 95 us_ticker_init();
AnnaBridge 174:b96e65c34a4d 96
AnnaBridge 174:b96e65c34a4d 97 uint32_t delta = timestamp - us_ticker_read();
AnnaBridge 174:b96e65c34a4d 98 Timer_SetInterrupt(TIMER0, delta);
AnnaBridge 174:b96e65c34a4d 99 }
<> 144:ef7eb2e8f9f7 100
AnnaBridge 174:b96e65c34a4d 101 void us_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 102 {
AnnaBridge 174:b96e65c34a4d 103 uint32_t us_ticker_irqn1 = Timer_GetIRQn(TIMER1);
AnnaBridge 174:b96e65c34a4d 104 NVIC_SetPendingIRQ((IRQn_Type)us_ticker_irqn1);
<> 144:ef7eb2e8f9f7 105 }
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 void us_ticker_disable_interrupt(void) {
<> 144:ef7eb2e8f9f7 108 Timer_DisableInterrupt(TIMER0);
<> 144:ef7eb2e8f9f7 109 }
<> 144:ef7eb2e8f9f7 110
<> 144:ef7eb2e8f9f7 111 void us_ticker_clear_interrupt(void) {
<> 144:ef7eb2e8f9f7 112 Timer_ClearInterrupt(TIMER0);
<> 144:ef7eb2e8f9f7 113 }