first re-commit.

piglcd.cpp

@@ -0,0 +1,182 @@
+/*****************************************************************************
+
+    source::worx libPiGPio
+    Copyright © 2022 c.holzheuer
+    chris@sourceworx.org
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    Uses:
+
+    pigpiod_if2 by joan2937, pigpio @ abyz.me.uk
+    https://abyz.me.uk/rpi/pigpio
+
+    sigslot  by 2017 Pierre-Antoine Lacaze
+    https://github.com/palacaze/sigslot
+
+***************************************************************************/
+
+
+#include <piglcd.h>
+
+
+
+pigLCD::pigLCD( i2c_addr_t addr, i2c_bus_t bus )
+{
+    init( addr,  bus );
+}
+
+
+pigLCD::~pigLCD()
+{
+    reset();
+}
+
+
+void pigLCD::init( i2c_addr_t addr, i2c_bus_t bus, int width, bool bl, uint8_t RS, uint8_t , uint8_t E, uint8_t BL, uint8_t B4 )
+{
+    _i2c.init( addr, bus );
+
+    _width = width;
+    _backlight = bl;
+
+    _RS = (1<<RS);
+    _E  = (1<<E);
+    _BL = (1<<BL);
+    _B4 = B4;
+
+    put_inst( 0x33 ); // Initialise 1
+    put_inst( 0x32 ); // Initialise 2
+    put_inst( 0x06 ); // Cursor increment
+    put_inst( 0x0C ); // Display on,move_to off, blink off
+    put_inst( 0x28 ); // 4-bits, 1 line, 5x8 font
+    put_inst( 0x01 ); // Clear display
+    //?? move_to( 0,0 )
+    put_inst( _LCD_ROW[0]+0 );
+
+}
+
+
+/**
+ * @brief pigLCD::close
+ * Close the LCD (clearing the screen) and release used resources.
+ */
+
+void pigLCD::reset()
+{
+    put_inst( 0x01 ); // Clear display
+    set_backlight( false );
+}
+
+
+/**
+ * @brief pigLCD::set_backlight
+ * @param bl
+ * toogle backlight on or off.
+ */
+
+void pigLCD::set_backlight( bool bl )
+{
+    _backlight = bl;
+    // hack
+    move_to( 0, 0 );
+}
+
+
+/**
+ * @brief pigLCD::move_to
+ * @param row
+ * @param col
+ *
+ * Position cursor at row and column (0 based).
+ */
+
+void pigLCD::move_to( int row, int col )
+{
+   put_inst( _LCD_ROW[row]+col );
+}
+
+
+/**
+ * @brief pigLCD::write
+ * @param c
+ * Write a character at the current cursor postion and
+ * increment the cursor.
+ */
+
+void pigLCD::write( const char c )
+{
+    put_data( (uint8_t) c );
+}
+
+
+void pigLCD::write( const std::string text )
+{
+    for( const char c : text )
+        write( c );
+}
+
+
+void pigLCD::write( int row, int col, const std::string text )
+{
+    move_to( row, col );
+    write( text );
+}
+
+
+
+
+void pigLCD::put_byte( uint8_t MSb, uint8_t LSb )
+{
+
+  if( _backlight )
+  {
+      MSb |= _BL;
+      LSb |= _BL;
+  }
+  
+  char buf[4];
+  buf[0] = (char) MSb | _E;
+  buf[1] = (char) MSb & ~_E;
+  buf[2] = (char) LSb | _E;
+  buf[3] = LSb & ~_E;
+  _i2c.i2c_write_device( buf, 4 );
+ 
+  //    self.pi.i2c_write_device(self._h,
+  //       [MSb | self.E, MSb & ~self.E, LSb | self.E, LSb & ~self.E]) */
+
+}
+
+
+void pigLCD::put_inst( uint8_t bits )
+{
+
+    uint8_t MSN = (bits>>4) & 0x0F;
+    uint8_t LSN = bits & 0x0F;
+
+    uint8_t MSb = MSN << _B4;
+    uint8_t LSb = LSN << _B4;
+
+    put_byte( MSb, LSb );
+
+}
+
+
+void pigLCD::put_data( uint8_t bits )
+{
+
+    uint8_t MSN = (bits>>4) & 0x0F;
+    uint8_t LSN = bits & 0x0F;
+
+    uint8_t MSb = (MSN << _B4) | _RS;
+    uint8_t LSb = (LSN << _B4) | _RS;
+
+    put_byte( MSb, LSb );
+
+}
+
+
+