robijn
faa4861eb3
- supports new API - major clean up, more consistent code - uses configfile options - serialLpt works also with only 2 output lines - serialLpt can now use keypad
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
// This header contains low level code to export from hd44780.c to "lower" HW
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// implementation dependent files.
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#ifndef HD_LOW_H
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#define HD_LOW_H
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enum ifWidth { IF_4bit, IF_8bit };
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//void common_init (enum ifWidth ifwidth);
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void common_init ();
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// Structures holding pointers to HD44780 specific functions
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typedef struct hwDependentFns {
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// microsec pauses
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void (*uPause) (int microSecondsTenths);
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// Senddata to the LCD
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// dispID - display to send data to (0 = all displays)
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// flags - data or instruction command (RS_DATA | RS_INSTR)
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// ch - character to display or instruction value
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void (*senddata) (unsigned char dispID, unsigned char flags, unsigned char ch);
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// Switch the backlight on or off
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// state - to be or not to be on
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void (*backlight) (unsigned char state);
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// Read the keypad
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// Ydata - the up to 11 bits that should be put on the Y side of the matrix
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// return - the up to 5 bits that are read out on the X side of the matrix
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unsigned char (*readkeypad) (unsigned int Ydata);
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// Scan the keypad and return a scancode.
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// The code is the Yvalue in the high nibble and the Xvalue in the low nibble.
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// A subdriver should do only one of two things:
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// - set readkeypad; or
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// - override scankeypad.
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unsigned char (*scankeypad) ();
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} HD44780_functions; /* for want of a better name :-) */
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extern HD44780_functions *hd44780_functions;
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// commands for senddata
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#define RS_DATA 0x00
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#define RS_INSTR 0x01
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#define CLEAR 0x01
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#define HOMECURSOR 0x02
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#define ENTRYMODE 0x04
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#define E_MOVERIGHT 0x02
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#define E_MOVELEFT 0x00
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#define EDGESCROLL 0x01
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#define NOSCROLL 0x00
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#define ONOFFCTRL 0x08
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#define DISPON 0x04
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#define DISPOFF 0x00
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#define CURSORON 0x02
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#define CURSOROFF 0x00
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#define CURSORBLINK 0x01
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#define CURSORNOBLINK 0x00
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#define CURSORSHIFT 0x10
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#define SCROLLDISP 0x08
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#define MOVECURSOR 0x00
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#define MOVERIGHT 0x04
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#define MOVELEFT 0x00
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#define FUNCSET 0x20
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#define IF_8BIT 0x10
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#define IF_4BIT 0x00
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#define TWOLINE 0x08
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#define ONELINE 0x00
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#define LARGECHAR 0x04 /* 5x11 characters */
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#define SMALLCHAR 0x00 /* 5x8 characters */
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#define SETCHAR 0x40
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#define POSITION 0x80
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// Parallel port pin definitions
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// Output lines
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#define nSTRB 0x01 /* negative logic */
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#define STRB 0x01
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#define nLF 0x02
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#define LF 0x02
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#define INIT 0x04 /* the only positive logic output line */
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#define nSEL 0x08
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#define SEL 0x08
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#define OUTMASK 0x0B /* SEL, LF and STRB are hardware inverted */
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// Input lines
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#define nFAULT 0x08
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#define FAULT 0x08
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#define SELIN 0x10
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#define PAPEREND 0x20
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#define nACK 0x40
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#define ACK 0x40
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#define BUSY 0x80
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#define INMASK 0x84 /* BUSY input and the IRQ indicator are inverted */
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#endif
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