FreeCalypso > hg > fc-tourmaline
view src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 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 |
| parents | 4e78acac3d88 |
| children |
line wrap: on
line source
/*****************************************************************************/ /* */ /* ========================================================================= */ /* */ /* Copyright (c) 2002 */ /* Matsushita Communication Industrial, MMCD USA */ /* */ /* ========================================================================= */ /* */ /* File Name: */ /* l1gtt_baudot_functions.h */ /* */ /* Purpose: */ /* This is the header file for "l1gtt_baudot_functions.c". */ /* */ /* */ /* Warnings: */ /* */ /* */ /*****************************************************************************/ /*** Maintenance *********************************************************/ /* */ /* */ /* 02/11/2002 initial version created Laura Ning */ /* */ /*************************************************************************/ #ifndef _BAUDOT_DECODE_H_ #define BAUDOT_DECODE_H #include "ctm_typedefs.h" /* ******************************************************************************* * DEFINITIONS ******************************************************************************* */ /* definitions (might be of global interest) */ #define BAUDOT_NUM_INFO_BITS 5 /* number of info bits per TTY character */ #define BAUDOT_SHIFT_FIGURES 27 /* code of shift to figures symbol */ #define BAUDOT_SHIFT_LETTERS 31 /* code of shift to letters symbol */ #define BAUDOT_LOGICAL_1 1 #define BAUDOT_LOGICAL_0 -1 #define BAUDOT_NON_TTY 0 #define BAUDOT_START_BIT -1 #define BAUDOT_STOP_BIT 1 #define BAUDOT_STOP_OUTPUT 2 /* STOP bit as the output of baudot_encode() to DSP */ /* definations (be only of local interest) */ #define START_OF_STOP_BIT 26 #define DETECT_WINDOW_WIDTH 4 /* A sliding window is used to detect start,stop and data bits */ #define BAUDOT_SAMPLE_DURATION 3 /* The duration to meet to determine a valid baudot bit */ /* A temporary assumption of the input buffer size, to be */ /* replaced later when TI has the actual buffer size defined */ #define MAX_WORDS_OF_BUFFER1 40 /* Number of the 5ms-bits it can contain */ #define TIME_INTERVAL_OF_BUFFER1 200 /* in the unit of ms */ #define MAX_WORDS_ONE_TTYCODE 36 /* Number of 5ms-bits a TTY character has */ #define NUM_STOP_BITS_TX 2 /* number of stop bits per character */ /* ******************************************************************/ /* Type definitions for variables that contain all states of the */ /* Baudot decoder */ /* ******************************************************************/ typedef struct { WORD16 remainedSampleVec[MAX_WORDS_ONE_TTYCODE]; /* hold the samples for last unfinished detection */ UWORD16 remainedSampleLen; /* length of the remaining samples for last unfinished detection */ WORD16 ttyCode; UWORD16 cntBitsActualChar; UWORD16 samplesRemained; /* number of samples left from last detection */ BOOL startBitDetected; BOOL inFigureMode; } baudot_decode_state_t; /* ******************************************************************/ /* Type definitions for variables that contain all states of the */ /* Baudot encoder */ /* ******************************************************************/ typedef struct { WORD16 cntCharsSinceLastShift; BOOL inFigureMode; BOOL tailBitsGenerated; // fifo_state_t fifo_state; } baudot_encode_state_t; /****************************************************************************/ /* convertChar2ttyCode() */ /* ********************* */ /* Conversion from character into tty code */ /* */ /* input variables: */ /* - inChar charcater that shall be converted */ /* */ /* return value: baudot code of the input character */ /* or -1 in case that inChar is not valid (e.g. inChar=='\0')*/ /* */ /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */ /****************************************************************************/ WORD16 convertChar2ttyCode(char inChar); /****************************************************************************/ /* convertTTYcode2char() */ /* ********************* */ /* Conversion from tty code into character */ /* */ /* input variables: */ /* - ttyCode Baudot code (must be within the range 0...63) */ /* or -1 if there is nothing to convert */ /* */ /* return value: character (or '\0' if ttyCode is not valid) */ /* */ /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */ /****************************************************************************/ char convertTTYcode2char(WORD16 ttyCode); /* prototype declarations */ void init_baudot_decode(baudot_decode_state_t* state); void init_baudot_encode(baudot_encode_state_t* state); void reset_baudot_decode(baudot_decode_state_t* state); void baudot_decode(WORD16* sampleVec, WORD16 numSamples, fifo_state_t* ptrOutFifoState, baudot_decode_state_t* state); void baudot_encode(WORD16 inputTTYcode, fifo_state_t* ptrOutFifoState, baudot_encode_state_t* state); #endif