view src/nucleus/hid.c @ 72:7bf39f5e834d

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 (2020-10-24)
parents 4e78acac3d88
children
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/*************************************************************************/
/*                                                                       */
/*               Copyright Mentor Graphics Corporation 2002              */
/*                         All Rights Reserved.                          */
/*                                                                       */
/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  */
/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   */
/* SUBJECT TO LICENSE TERMS.                                             */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                               VERSION       */
/*                                                                       */
/*      hid.c                                          Nucleus PLUS 1.14 */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      HI - History Management                                          */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains global data structures for use within the     */
/*      History Management component.                                    */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      HID_History_Enable                  History saving enabled flag  */
/*      HID_Write_Index                     Current write index into     */
/*                                            history table              */
/*      HID_Read_Index                      Current read index into      */
/*                                            history table              */
/*      HID_Entry_Count                     Number of entries in the     */
/*                                            table counter              */
/*      HID_History_Protect                 History protection           */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      hi_defs.h                           History Management constants */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*        DATE                    REMARKS                                */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Updated copyright notice,                        */
/*                      resulting in version 1.1                         */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*      04-17-1996      updated to version 1.2                           */
/*      03-24-1998      Released version 1.3                             */
/*      03-26-1999      Released 1.11m (new release                      */
/*                        numbering scheme)                              */
/*      04-17-2002      Released version 1.13m                           */
/*      11-07-2002      Released version 1.14                            */
/*************************************************************************/
#define         NU_SOURCE_FILE

#include        "hi_defs.h"                 /* History constants         */


/* HID_History_Enable is a flag that indicates whether or not history saving
   is enabled.  If this value is NU_FALSE, history saving is disabled.
   Otherwise, history saving is enabled.  */

INT     HID_History_Enable;


/* HID_Write_Index is the index of the next available entry in the history
   table.  */

INT     HID_Write_Index;


/* HID_Read_Index is the index of the oldest entry in the history table.  */

INT     HID_Read_Index;


/* HID_Entry_Count keeps track of the number of entries currently
   in the history table.  */

INT     HID_Entry_Count;


/* HID_History_Protect is a protection structure used to block any other
   thread from access to the history data structures.  */

TC_PROTECT      HID_History_Protect;