PCF2119_16X2_LCD.cpp

00001 #include "PC2119_16X2_LCD.h"
00002 #include <stdarg.h>
00003 
00004 void PC2119_16X2_LCD::Init() {
00005     // reset the LCD using external reset pin
00006     _reset = 1;
00007     wait_us(300);
00008     _reset = 0;
00009     wait_us(12000);
00010 
00011     char buf[15];
00012     buf[0] = INSTRUCTION_CTRL_BYTE;
00013     buf[1] = (FUNCTION_SET | 0x01); // Function set + extended instruction set
00014     buf[2] = CURSOR_DISLPAY_SHIFT;
00015     buf[3] = ICON_CTRL;
00016     buf[4] = VLCD_MULTIPLIER; //set Vlcd multiplier
00017     buf[5] = VLCD_CONTRAST; //set Vlcd Contrast
00018 
00019     buf[6] = FUNCTION_SET; // basic instructions
00020     buf[7] = DISPLAY_CTL;
00021     buf[8] = ENTRY_MODE;
00022     buf[9] = CLEAR_DISPLAY;
00023 
00024     _i2c.write(LCD_I2C_ADR, buf, 10);
00025 }
00026 
00027 
00028 PC2119_16X2_LCD::PC2119_16X2_LCD(PinName p_sda, PinName p_scl, PinName p_reset) : _i2c(p_sda, p_scl), _reset(p_reset) {
00029 
00030     PC2119_16X2_LCD::Init();
00031 }
00032 
00033 PC2119_16X2_LCD::PC2119_16X2_LCD(I2C& p_i2c, PinName p_reset) : _i2c(p_i2c), _reset(p_reset) {
00034 
00035     PC2119_16X2_LCD::Init();
00036 
00037 }
00038 
00039 char PC2119_16X2_LCD::ascii_to_lcd(char ch) {
00040     char c = BLANK_CHAR;  // default: white space
00041 
00042     if ((ch>=' ') & (ch<='?'))
00043         c = ASCII_OFFSET + ch;
00044     if ((ch>='A') & (ch<='Z'))
00045         c = ASCII_OFFSET + ch;
00046     if ((ch>='a') & (ch<='z'))
00047         c = ASCII_OFFSET + ch;
00048     return c;
00049 }
00050 
00051 void PC2119_16X2_LCD::write_xy(char c, char row, char column, bool raw) {
00052     char buf[0x10];
00053     char adr;
00054 
00055     if (row == 0)                               // line offset
00056         adr = column;
00057     else
00058         adr = DATA_CTRL_BYTE + column;
00059 
00060     buf[0] = INSTRUCTION_CTRL_BYTE;            // Enter function setting
00061     buf[1] = 0x80 + adr;    // LCD adr counter set to "adr"
00062 
00063     _i2c.write(LCD_I2C_ADR,(char *)buf,2);
00064 
00065     buf[0] = DATA_CTRL_BYTE;            // write to DDRAM
00066     buf[1] = raw ? c : ascii_to_lcd(c);
00067 
00068     _i2c.write(LCD_I2C_ADR,(char *)buf,2);
00069 }
00070 
00071 void PC2119_16X2_LCD::clear_line(char row) {
00072     if (row == 0 || row == 1) {
00073         char i=0;
00074         do
00075             write_xy(BLANK_CHAR, row, i);
00076         while ((i++<16));
00077     }
00078 }
00079 
00080 void PC2119_16X2_LCD::clear_display(void) {
00081     clear_line(0);                // clear 1st line
00082     clear_line(1);                // clear 2nd line
00083     return;
00084 }
00085 
00086 void PC2119_16X2_LCD::write(char *b) {
00087     char buf[0x60];
00088     int a;
00089 
00090     buf[0]=INSTRUCTION_CTRL_BYTE;
00091     buf[1]=0x80;
00092     _i2c.write(LCD_I2C_ADR,(char *)buf,2);
00093 
00094     a=0;
00095     buf[0]=DATA_CTRL_BYTE;
00096 
00097     while (a!=strlen(b)) {
00098         buf[a+1]=ascii_to_lcd(b[a]);
00099         a++;
00100     }
00101     buf[a+1]=INSTRUCTION_CTRL_BYTE;
00102 
00103     _i2c.write(LCD_I2C_ADR,buf,strlen(b)+1);
00104 
00105     buf[0]=0x80;
00106     buf[1]=0x02;
00107     _i2c.write(LCD_I2C_ADR,(char *)buf,2);
00108 }
00109 
00110 void PC2119_16X2_LCD::printf(const char * format, ... ) {
00111     // create and start the va_list
00112     va_list listPointer ;
00113     va_start( listPointer, format ) ;
00114 
00115     // vsprintf is an example of
00116     // a function that works with
00117     // an "already started" va_list
00118     static char buf[ 1024 ] ;
00119     vsprintf( buf, format, listPointer ) ;
00120 
00121     return write(buf);
00122 }
00123 
00124 void PC2119_16X2_LCD::flip_display() {
00125     _i2c.start();
00126     _i2c.write(LCD_I2C_ADR);
00127     _i2c.write(INSTRUCTION_CTRL_BYTE);          // Control byte for Instruction
00128     _i2c.write(FUNCTION_SET | 0x01); // extended instruction mode
00129     _i2c.write(0x07);          // P=1; Q=1;
00130     _i2c.write(FUNCTION_SET);
00131     _i2c.stop();
00132 }
00133 
00134 void PC2119_16X2_LCD::unflip_display() {
00135     _i2c.start();
00136     _i2c.write(LCD_I2C_ADR);
00137     _i2c.write(INSTRUCTION_CTRL_BYTE);          // Control byte for Instruction
00138     _i2c.write(FUNCTION_SET | 0x01);
00139     _i2c.write(0x04);          // P=0; Q=0;
00140     _i2c.write(FUNCTION_SET);
00141     _i2c.stop();
00142 }