4.115
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1 | /* |
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2 | * Timer Library (TLIB) |
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3 | * |
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4 | * COPYRIGHT (c) 2011. |
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5 | * Cobham Gaisler AB. |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.org/license/LICENSE. |
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10 | */ |
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11 | |
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12 | #include <rtems.h> |
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13 | #include <bsp/tlib.h> |
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14 | |
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15 | struct tlib_dev *tlib_dev_head = NULL; |
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16 | struct tlib_dev *tlib_dev_tail = NULL; |
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17 | static int tlib_dev_cnt = 0; |
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18 | |
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19 | /* Register Timer device to Timer Library */ |
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20 | int tlib_dev_reg(struct tlib_dev *newdev) |
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21 | { |
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22 | /* Reset device */ |
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23 | newdev->status = 0; |
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24 | newdev->isr_func = NULL; |
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25 | newdev->index = tlib_dev_cnt; |
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26 | |
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27 | /* Insert last in queue */ |
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28 | newdev->next = NULL; |
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29 | if ( tlib_dev_tail == NULL ) { |
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30 | tlib_dev_head = newdev; |
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31 | } else { |
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32 | tlib_dev_tail->next = newdev; |
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33 | } |
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34 | tlib_dev_tail = newdev; |
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35 | |
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36 | /* Return Index of Registered Timer */ |
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37 | return tlib_dev_cnt++; |
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38 | } |
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39 | |
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40 | void *tlib_open(int timer_no) |
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41 | { |
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42 | struct tlib_dev *dev; |
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43 | |
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44 | if ( timer_no < 0 ) |
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45 | return NULL; |
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46 | |
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47 | dev = tlib_dev_head; |
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48 | while ( (timer_no > 0) && dev ) { |
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49 | timer_no--; |
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50 | dev = dev->next; |
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51 | } |
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52 | if ( dev ) { |
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53 | if ( dev->status ) |
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54 | return NULL; |
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55 | dev->status = 1; |
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56 | /* Reset Timer to initial state */ |
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57 | tlib_reset(dev); |
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58 | } |
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59 | return dev; |
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60 | } |
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61 | |
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62 | void tlib_close(void *hand) |
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63 | { |
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64 | struct tlib_dev *dev = hand; |
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65 | |
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66 | /* Stop any ongoing timer operation and unregister IRQ if registered */ |
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67 | tlib_stop(dev); |
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68 | tlib_irq_unregister(dev); |
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69 | |
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70 | /* Mark not open */ |
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71 | dev->status = 0; |
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72 | } |
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73 | |
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74 | int tlib_ntimer(void) |
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75 | { |
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76 | return tlib_dev_cnt; |
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77 | } |
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