SO1602A.h

00001 /**  SO1602A is Organic-LED, and has 16 chars/line and 2 lines.
00002  * 
00003  * This librarry supports "printf()" C format.
00004  * 
00005  *
00006  * @code
00007  * #include "mbed.h"
00008  * #include "SO1602A.h"
00009  * I2C i2c(p28, p27);
00010  * SO1602A oled(i2c);
00011  * DigitalOut led[]= {LED1, LED2, LED3, LED4};
00012  * int main()
00013  * {
00014  *     oled.init();
00015  *     int iter= 0;
00016  *     while(true) {
00017  *         led[0] = !led[0];
00018  *         oled.printf("iter: %5.5d.", iter);
00019  *         wait(1.0f);
00020  *         if(iter%10 == 0)    // 10s
00021  *             oled.clear();
00022  *         iter++;
00023  *     }
00024  * }
00025  * @endcode
00026  */
00027 
00028 #pragma once
00029 
00030 #include "mbed.h"
00031 
00032 // SA0(Pin4); Low: i2c_addr= 0x78, High: 0x7a;
00033 // DDRAM addr. Line1: 0x00 ~ 0x0f. Line2: 0x20 ~ 0x2f.
00034 
00035 class SO1602A : public Stream{
00036 public:
00037     SO1602A (PinName sda, PinName scl, char address= 0x78);
00038     SO1602A (I2C &_i2c, char address= 0x78);
00039     ~SO1602A();
00040 //  ******************** printf() future of C-language. ***************************
00041 
00042     /** Initialize
00043      */
00044     void init();
00045 
00046     /** Clear Display.
00047      */
00048     void clear();
00049     
00050     /** Set Position of char.
00051      *  @param col: column, row: rows.
00052      */
00053     void locate(int col, int row);
00054     
00055     /** Set Contrast.
00056      *  @param val; 256steps, 0x00 ~ 0xff. Contrast increas as the value.
00057      */
00058     void setContrast(char val);
00059     
00060     /** Set Display flag.
00061      * @parm Enable Display, Cursor turned on, Cursor Blink.
00062      */
00063     void setDispFlag(bool disp= true, bool cursor= true, bool blink= true);
00064 
00065 private:    
00066     I2C *p_i2c;
00067     I2C &i2c;
00068     char addr;
00069     char buf[3];
00070     int col, row;
00071     
00072     bool cmd(char chr);
00073     
00074     // virtual func for printf() in Stream-class.
00075     virtual int _putc(int val);
00076     virtual int _getc();
00077     
00078 // Function SET
00079     void setRE();
00080     void clearRE();
00081     void setSD();
00082     void clearSD();
00083 
00084 };
00085 
00086 // EOF