forked from Imagelibrary/rtems
78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
/*
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* Timer Library (TLIB)
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*
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* COPYRIGHT (c) 2011.
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* Cobham Gaisler AB.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems.h>
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#include <grlib/tlib.h>
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struct tlib_dev *tlib_dev_head = NULL;
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struct tlib_dev *tlib_dev_tail = NULL;
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static int tlib_dev_cnt = 0;
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/* Register Timer device to Timer Library */
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int tlib_dev_reg(struct tlib_dev *newdev)
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{
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/* Reset device */
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newdev->status = 0;
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newdev->isr_func = NULL;
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newdev->index = tlib_dev_cnt;
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/* Insert last in queue */
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newdev->next = NULL;
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if ( tlib_dev_tail == NULL ) {
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tlib_dev_head = newdev;
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} else {
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tlib_dev_tail->next = newdev;
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}
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tlib_dev_tail = newdev;
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/* Return Index of Registered Timer */
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return tlib_dev_cnt++;
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}
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void *tlib_open(int timer_no)
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{
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struct tlib_dev *dev;
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if ( timer_no < 0 )
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return NULL;
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dev = tlib_dev_head;
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while ( (timer_no > 0) && dev ) {
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timer_no--;
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dev = dev->next;
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}
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if ( dev ) {
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if ( dev->status )
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return NULL;
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dev->status = 1;
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/* Reset Timer to initial state */
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tlib_reset(dev);
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}
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return dev;
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}
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void tlib_close(void *hand)
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{
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struct tlib_dev *dev = hand;
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/* Stop any ongoing timer operation and unregister IRQ if registered */
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tlib_stop(dev);
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tlib_irq_unregister(dev);
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/* Mark not open */
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dev->status = 0;
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}
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int tlib_ntimer(void)
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{
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return tlib_dev_cnt;
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}
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