Diff: PCF2119_16X2_LCD.cpp

Revision:

0:581d2def0734

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF2119_16X2_LCD.cpp	Fri May 13 13:25:10 2011 +0000
@@ -0,0 +1,142 @@
+#include "PC2119_16X2_LCD.h"
+#include <stdarg.h>
+
+void PC2119_16X2_LCD::Init() {
+    // reset the LCD using external reset pin
+    _reset = 1;
+    wait_us(300);
+    _reset = 0;
+    wait_us(12000);
+
+    char buf[15];
+    buf[0] = INSTRUCTION_CTRL_BYTE;
+    buf[1] = (FUNCTION_SET | 0x01); // Function set + extended instruction set
+    buf[2] = CURSOR_DISLPAY_SHIFT;
+    buf[3] = ICON_CTRL;
+    buf[4] = VLCD_MULTIPLIER; //set Vlcd multiplier
+    buf[5] = VLCD_CONTRAST; //set Vlcd Contrast
+
+    buf[6] = FUNCTION_SET; // basic instructions
+    buf[7] = DISPLAY_CTL;
+    buf[8] = ENTRY_MODE;
+    buf[9] = CLEAR_DISPLAY;
+
+    _i2c.write(LCD_I2C_ADR, buf, 10);
+}
+
+
+PC2119_16X2_LCD::PC2119_16X2_LCD(PinName p_sda, PinName p_scl, PinName p_reset) : _i2c(p_sda, p_scl), _reset(p_reset) {
+
+    PC2119_16X2_LCD::Init();
+}
+
+PC2119_16X2_LCD::PC2119_16X2_LCD(I2C& p_i2c, PinName p_reset) : _i2c(p_i2c), _reset(p_reset) {
+
+    PC2119_16X2_LCD::Init();
+
+}
+
+char PC2119_16X2_LCD::ascii_to_lcd(char ch) {
+    char c = BLANK_CHAR;  // default: white space
+
+    if ((ch>=' ') & (ch<='?'))
+        c = ASCII_OFFSET + ch;
+    if ((ch>='A') & (ch<='Z'))
+        c = ASCII_OFFSET + ch;
+    if ((ch>='a') & (ch<='z'))
+        c = ASCII_OFFSET + ch;
+    return c;
+}
+
+void PC2119_16X2_LCD::write_xy(char c, char row, char column, bool raw) {
+    char buf[0x10];
+    char adr;
+
+    if (row == 0)                               // line offset
+        adr = column;
+    else
+        adr = DATA_CTRL_BYTE + column;
+
+    buf[0] = INSTRUCTION_CTRL_BYTE;            // Enter function setting
+    buf[1] = 0x80 + adr;    // LCD adr counter set to "adr"
+
+    _i2c.write(LCD_I2C_ADR,(char *)buf,2);
+
+    buf[0] = DATA_CTRL_BYTE;            // write to DDRAM
+    buf[1] = raw ? c : ascii_to_lcd(c);
+
+    _i2c.write(LCD_I2C_ADR,(char *)buf,2);
+}
+
+void PC2119_16X2_LCD::clear_line(char row) {
+    if (row == 0 || row == 1) {
+        char i=0;
+        do
+            write_xy(BLANK_CHAR, row, i);
+        while ((i++<16));
+    }
+}
+
+void PC2119_16X2_LCD::clear_display(void) {
+    clear_line(0);                // clear 1st line
+    clear_line(1);                // clear 2nd line
+    return;
+}
+
+void PC2119_16X2_LCD::write(char *b) {
+    char buf[0x60];
+    int a;
+
+    buf[0]=INSTRUCTION_CTRL_BYTE;
+    buf[1]=0x80;
+    _i2c.write(LCD_I2C_ADR,(char *)buf,2);
+
+    a=0;
+    buf[0]=DATA_CTRL_BYTE;
+
+    while (a!=strlen(b)) {
+        buf[a+1]=ascii_to_lcd(b[a]);
+        a++;
+    }
+    buf[a+1]=INSTRUCTION_CTRL_BYTE;
+
+    _i2c.write(LCD_I2C_ADR,buf,strlen(b)+1);
+
+    buf[0]=0x80;
+    buf[1]=0x02;
+    _i2c.write(LCD_I2C_ADR,(char *)buf,2);
+}
+
+void PC2119_16X2_LCD::printf(const char * format, ... ) {
+    // create and start the va_list
+    va_list listPointer ;
+    va_start( listPointer, format ) ;
+
+    // vsprintf is an example of
+    // a function that works with
+    // an "already started" va_list
+    static char buf[ 1024 ] ;
+    vsprintf( buf, format, listPointer ) ;
+
+    return write(buf);
+}
+
+void PC2119_16X2_LCD::flip_display() {
+    _i2c.start();
+    _i2c.write(LCD_I2C_ADR);
+    _i2c.write(INSTRUCTION_CTRL_BYTE);          // Control byte for Instruction
+    _i2c.write(FUNCTION_SET | 0x01); // extended instruction mode
+    _i2c.write(0x07);          // P=1; Q=1;
+    _i2c.write(FUNCTION_SET);
+    _i2c.stop();
+}
+
+void PC2119_16X2_LCD::unflip_display() {
+    _i2c.start();
+    _i2c.write(LCD_I2C_ADR);
+    _i2c.write(INSTRUCTION_CTRL_BYTE);          // Control byte for Instruction
+    _i2c.write(FUNCTION_SET | 0x01);
+    _i2c.write(0x04);          // P=0; Q=0;
+    _i2c.write(FUNCTION_SET);
+    _i2c.stop();
+}
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