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Diff: common/us_ticker_api.c
- Revision:
- 525:c320967f86b9
- Parent:
- 495:01cb89f68337
--- a/common/us_ticker_api.c Mon Apr 27 09:45:08 2015 +0100 +++ b/common/us_ticker_api.c Tue Apr 28 11:45:12 2015 +0100 @@ -1,5 +1,5 @@ /* mbed Microcontroller Library - * Copyright (c) 2006-2013 ARM Limited + * Copyright (c) 2015 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -13,122 +13,29 @@ * See the License for the specific language governing permissions and * limitations under the License. */ -#include <stddef.h> #include "us_ticker_api.h" -#include "cmsis.h" - -static ticker_event_handler event_handler; -static ticker_event_t *head = NULL; -void us_ticker_set_handler(ticker_event_handler handler) { - us_ticker_init(); - - event_handler = handler; -} - -void us_ticker_irq_handler(void) { - us_ticker_clear_interrupt(); +static ticker_event_queue_t events; - /* Go through all the pending TimerEvents */ - while (1) { - if (head == NULL) { - // There are no more TimerEvents left, so disable matches. - us_ticker_disable_interrupt(); - return; - } +static const ticker_interface_t us_interface = { + .init = us_ticker_init, + .read = us_ticker_read, + .disable_interrupt = us_ticker_disable_interrupt, + .clear_interrupt = us_ticker_clear_interrupt, + .set_interrupt = us_ticker_set_interrupt, +}; - if ((int)(head->timestamp - us_ticker_read()) <= 0) { - // This event was in the past: - // point to the following one and execute its handler - ticker_event_t *p = head; - head = head->next; - if (event_handler != NULL) { - event_handler(p->id); // NOTE: the handler can set new events - } - /* Note: We continue back to examining the head because calling the - * event handler may have altered the chain of pending events. */ - } else { - // This event and the following ones in the list are in the future: - // set it as next interrupt and return - us_ticker_set_interrupt(head->timestamp); - return; - } - } +static const ticker_data_t us_data = { + .interface = &us_interface, + .queue = &events, +}; + +const ticker_data_t* get_us_ticker_data(void) +{ + return &us_data; } -void us_ticker_insert_event(ticker_event_t *obj, timestamp_t timestamp, uint32_t id) { - /* disable interrupts for the duration of the function */ - __disable_irq(); - - // initialise our data - obj->timestamp = timestamp; - obj->id = id; - - /* Go through the list until we either reach the end, or find - an element this should come before (which is possibly the - head). */ - ticker_event_t *prev = NULL, *p = head; - while (p != NULL) { - /* check if we come before p */ - if ((int)(timestamp - p->timestamp) < 0) { - break; - } - /* go to the next element */ - prev = p; - p = p->next; - } - - /* if we're at the end p will be NULL, which is correct */ - obj->next = p; - - /* if prev is NULL we're at the head */ - if (prev == NULL) { - head = obj; - us_ticker_set_interrupt(timestamp); - } else { - prev->next = obj; - } - - __enable_irq(); +void us_ticker_irq_handler(void) +{ + ticker_irq_handler(&us_data); } - -void us_ticker_remove_event(ticker_event_t *obj) { - __disable_irq(); - - // remove this object from the list - if (head == obj) { - // first in the list, so just drop me - head = obj->next; - if (head == NULL) { - us_ticker_disable_interrupt(); - } else { - us_ticker_set_interrupt(head->timestamp); - } - } else { - // find the object before me, then drop me - ticker_event_t* p = head; - while (p != NULL) { - if (p->next == obj) { - p->next = obj->next; - break; - } - p = p->next; - } - } - - __enable_irq(); -} - -int us_ticker_get_next_timestamp(timestamp_t *timestamp) { - int ret = 0; - - /* if head is NULL, there are no pending events */ - __disable_irq(); - if (head != NULL) { - *timestamp = head->timestamp; - ret = 1; - } - __enable_irq(); - - return ret; -}