Diff: TextLCD_ERC1602_4.h

Revision:

0:5b8f0de660ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD_ERC1602_4.h	Sun May 04 11:31:31 2014 +0000
@@ -0,0 +1,164 @@
+#include    <stdarg.h>
+#include    "mbed.h"
+#include    "I2cBusDevice.h"
+
+//EastRising ERC1602-4 i2c display using ST7032i
+
+
+//  i2c address
+const char    ERC1602_4_addr = 0x7C;
+
+//  initialization command sequence
+const char    Comm_FunctionSet_Normal      = 0x38;
+const char    Comm_FunctionSet_Extended    = 0x39;
+const char    Comm_InternalOscFrequency    = 0x1C;
+const char    Comm_ContrastSet             = 0x70;
+const char    Comm_PwrIconContrast         = 0x57;
+const char    Comm_FollowerCtrl            = 0x6C;
+const char    Comm_DisplayOnOff            = 0x0C;
+const char    Comm_ClearDisplay            = 0x01;
+const char    Comm_EntryModeSet            = 0x04;
+const char    Comm_ReturnHome              = 0x02;
+
+//  general commands
+const char    Comm_SetDDRAMAddress        = 0x80;
+const char    DDRAMAddress_Ofst[]         = {0x00, 0x40};
+const char    Comm_SetCGRAM               = 0x40;
+
+//  setting values
+const char    default_Contrast            = 0x35;
+const char    COMMAND                     = 0x00;
+const char    DATA                        = 0x40;
+const char    MaxCharsInALine             = 0x10;    //buffer depth for one line (no scroll function used)
+const char    init_seq0_length  = 7;
+const char    init_seq0[ init_seq0_length ]
+=    {
+    Comm_FunctionSet_Normal,
+    Comm_ReturnHome,             //This may be required to reset the scroll function
+    Comm_FunctionSet_Extended,
+    Comm_InternalOscFrequency,
+    Comm_ContrastSet            | ( default_Contrast       & 0xF),
+    Comm_PwrIconContrast        | ((default_Contrast >> 4) & 0x3),
+    Comm_FollowerCtrl           | 0x0A,
+
+};
+
+const char    init_seq1_length  = 3;
+const char    init_seq1[ init_seq1_length ]
+=    {
+    Comm_DisplayOnOff,
+    Comm_ClearDisplay,
+    Comm_EntryModeSet,
+};
+
+class TextLCD_ERC1602_4 : I2cBusDevice {
+public:
+
+    explicit TextLCD_ERC1602_4( I2C *LCD, char dev_address = ERC1602_4_addr, char *init_massage = NULL ) : I2cBusDevice( LCD, dev_address ) {
+    restart();
+    }
+    ~TextLCD_ERC1602_4() {
+    }
+
+    void restart( void ) {      
+       char *init_massage = NULL; 
+        wait_ms(1);    //    interval after hardware reset
+        for ( int i = 0; i < init_seq0_length; i++ ) {
+            lcd_command( init_seq0[ i ] );
+            wait_us(30);}
+        for ( int i = 0; i < init_seq1_length; i++ ) {
+            lcd_command( init_seq1[ i ] );}
+        if ( init_massage )
+            puts( 0, init_massage );
+        set_CGRAM( 7, '\x1F' );
+        curs[ 0 ]    = 0;
+        curs[ 1 ]    = 0;
+}
+
+    void cls( void ) {
+        lcd_command( Comm_ClearDisplay );
+        wait_ms(2);
+        curs[ 0 ]    = 0;
+        curs[ 1 ]    = 0;
+    }
+    void put_custom_char( char c_code, const char *cg, char x, char y ) {
+        for ( int i = 0; i < 5; i++ ) {
+            set_CGRAM( c_code, cg );
+            putcxy( c_code, x, y );
+        }
+    }
+    
+    void contrast( char contrast ) {
+        lcd_command( Comm_FunctionSet_Extended );
+        lcd_command( Comm_ContrastSet         |  (contrast     & 0x0f) );
+        lcd_command( Comm_PwrIconContrast     | ((contrast>>4) & 0x03) );
+        lcd_command( Comm_FunctionSet_Normal   );
+    }
+
+    void set_CGRAM( char char_code, const char* cg ) {
+        for ( int i = 0; i < 8; i++ ) {
+            lcd_command( (Comm_SetCGRAM | (char_code << 3) | i) );
+            lcd_data( *cg++ );
+        }
+    }
+
+    void set_CGRAM( char char_code, char v ) {
+        char    c[ 8 ];
+        for ( int i = 0; i < 8; i++ )
+            c[ i ]    = v;
+        set_CGRAM( char_code, c );
+    }
+
+    void putcxy( char c, char x, char y ) {
+        if ( (x >= MaxCharsInALine) || (y >= 2) )
+            return;
+
+        lcd_command( (Comm_SetDDRAMAddress | DDRAMAddress_Ofst[ y ]) + x );
+        lcd_data( c );
+    }
+
+    void putc( char line, char c ) {
+        if ( (c == '\n') || (c == '\r') ) {
+            clear_rest_of_line( line );
+            curs[ line ]    = 0;
+            return;
+        }
+        putcxy( c, curs[ line ]++, line );
+    }
+
+    void puts( char line, char *s ) {
+        while ( char c    = *s++ )
+            putc( line, c );
+    }
+
+    void printf( char line, char *format, ... ) {
+        char        s[ 32 ];
+        va_list        args;
+        va_start( args, format );
+        vsnprintf( s, 32, format, args );
+        va_end( args );
+        puts( line, s );
+    }
+
+private:
+    char    curs[2];
+    void clear_rest_of_line( char line ) {
+        for ( int i = curs[ line ]; i < MaxCharsInALine; i++ )
+            putcxy( ' ', i, line );
+    }
+
+    int lcd_write( char first, char second ) {
+        char cmd[2];
+        cmd[ 0 ]    = first;
+        cmd[ 1 ]    = second;          
+        return ( write( cmd, 2 ) );        
+    }
+
+    int lcd_command( char command ) {    
+        return ( lcd_write( COMMAND, command ) );
+    }
+    int lcd_data( char data ) {
+        return ( lcd_write( DATA, data ) );
+    }
+}
+;
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