FreeCalypso > hg > fc-tourmaline

annotate src/g23m-aci/gdd_dio/gdd_dio_queue.c @ 72:7bf39f5e834d

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backlight control on Luna: switch PWL instead of LEDB This change is preliminary toward upcoming rework of backlight control logic in our UI firmware. LEDB does not exist on Tango-based platforms (it is not brought out on Tango modules), thus turning it on and off produces absolutely no effect beyond making L1 disable deep sleep when LEDB is turned on. However, both iWOW DSK and our upcoming FC Caramel2 boards have a PWL LED, so let's switch that LED on and off to indicate the state of the UI firmware's backlight control. Note that we are NOT switching the actual Luna LCD backlight here, even though it is trivially controlled with a GPIO. The reason for this seemingly strange choice is that we don't want to turn this development board LCD backlight off until we bring the higher-level backlight control logic up to par, including new logic to "swallow" the first keypress that turns on the darkened LCD.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 24 Oct 2020 07:39:54 +0000
parents fa8dc04885d8
children
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1
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1 /*
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2 +-----------------------------------------------------------------------------
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3 | File : gdd_dio_queue.c
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4 +-----------------------------------------------------------------------------
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5 | Copyright 2002 Texas Instruments Berlin, AG
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6 | All rights reserved.
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7 |
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8 | This file is confidential and a trade secret of Texas
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9 | Instruments Berlin, AG
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10 | The receipt of or possession of this file does not convey
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11 | any rights to reproduce or disclose its contents or to
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12 | manufacture, use, or sell anything it may describe, in
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13 | whole, or in part, without the specific written consent of
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14 | Texas Instruments Berlin, AG.
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15 +-----------------------------------------------------------------------------
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16 | Purpose : Implements the queue functions for the DIO buffer FIFO
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17 +-----------------------------------------------------------------------------
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18 */
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19
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20
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21 #define ENTITY_GDD_DIO
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22
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23 /*==== INCLUDES =============================================================*/
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24
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25 #include "typedefs.h" /* to get Condat data types */
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26 #include "vsi.h" /* to get a lot of macros */
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27
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28 #include <string.h> /* for memset */
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29
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30 #include "gdd_dio_queue.h"
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31
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32 /*==== CONST ================================================================*/
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33
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34 /*==== LOCAL VARS ===========================================================*/
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35
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36 /*==== PRIVATE FUNCTIONS ====================================================*/
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37
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38 /*==== PUBLIC FUNCTIONS =====================================================*/
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39
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40
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41 GLOBAL void gdd_dio_queue_clear(T_GDD_BUF_QUEUE *queue)
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42 {
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43 queue->next_in = 0;
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44 queue->next_out = 0;
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45 memset(queue->elems, 0, sizeof(T_dio_buffer *) * GDD_MAX_DIO_BUF);
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46 }
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47
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48
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49 BOOL gdd_dio_queue_is_empty(const T_GDD_BUF_QUEUE *queue)
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50 {
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51 return (queue->next_in == queue->next_out) &&
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52 (0 == queue->elems[queue->next_out]);
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53 }
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54
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55
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56 GLOBAL BOOL gdd_dio_queue_is_full(const T_GDD_BUF_QUEUE *queue)
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57 {
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58 return (queue->next_in == queue->next_out) &&
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59 !(0 == queue->elems[queue->next_out]);
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60 }
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61
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62
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63 GLOBAL BOOL gdd_dio_dequeue(T_GDD_BUF_QUEUE *queue, T_dio_buffer **elem)
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64 {
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65 if(gdd_dio_queue_is_empty(queue))
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66 {
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67 return FALSE;
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68 }
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69 else
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70 {
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71 (*elem) = queue->elems[queue->next_out];
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72 queue->elems[queue->next_out] = 0;
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73 ++(queue->next_out);
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74 if(queue->next_out EQ GDD_MAX_DIO_BUF)
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75 queue->next_out = 0;
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76 return TRUE;
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77 }
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78 }
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79
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80 GLOBAL BOOL gdd_dio_queue_peek_next_for_dequeue
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81 (const T_GDD_BUF_QUEUE *queue, /*out*/T_dio_buffer **elem)
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82 {
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83 if(gdd_dio_queue_is_empty(queue))
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84 {
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85 return FALSE;
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86 }
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87 else
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88 {
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89 (*elem) = queue->elems[queue->next_out];
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90 return TRUE;
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91 }
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92 }
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93
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94 GLOBAL BOOL gdd_dio_enqueue(T_dio_buffer *elem, T_GDD_BUF_QUEUE *queue, /*out*/U16 *pos)
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95 {
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96 if(gdd_dio_queue_is_full(queue))
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97 {
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98 return FALSE;
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99 }
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100 else
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101 {
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102 queue->elems[queue->next_in] = elem;
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103 (*pos) = queue->next_in;
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104 ++(queue->next_in);
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105 if(queue->next_in EQ GDD_MAX_DIO_BUF)
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106 queue->next_in = 0;
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107 return TRUE;
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108 }
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109 }
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110
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111
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112 GLOBAL void gdd_dio_queue_peek(const T_GDD_BUF_QUEUE *queue, U16 pos, /*out*/T_dio_buffer **elem)
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113 {
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114 (*elem) = queue->elems[pos];
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115 }