kt_vfd.cpp

00001 /**
00002  * @bref VFD class imprementation
00003  * for GU256X128C-3900
00004  */
00005 #include "mbed.h"
00006 #include "kt_vfd.h"
00007 
00008 KT_VFD::KT_VFD(PinName rd, PinName wr,
00009                PinName d0, PinName d1, PinName d2, PinName d3,
00010                PinName d4, PinName d5, PinName d6, PinName d7) :
00011     _rd(rd), _wr(wr),
00012     _d(d0, d1, d2, d3, d4, d5, d6, d7)
00013 {
00014     _rd = 1 ;
00015     _wr = 1 ;
00016 
00017     wait_ms(100) ;
00018     write_byte(0x1b) ;
00019     write_byte(0x40) ;
00020     wait_ms(100) ;
00021 }
00022 
00023 void KT_VFD::write_mode(unsigned char mode)
00024 {
00025     write_byte(0x1f) ;
00026     write_byte(0x28) ;
00027     write_byte(0x77) ;
00028     write_byte(0x10) ;
00029     write_byte(mode) ;
00030 }
00031 
00032 void KT_VFD::disp_mode(unsigned char mode)
00033 {
00034     write_byte(0x1f) ;
00035     write_byte(mode) ;
00036 }
00037 
00038 void KT_VFD::scroll_speed(unsigned char n)
00039 {
00040     write_byte(0x1f) ;
00041     write_byte(0x73) ;
00042     write_byte(n) ; // 0x00 - 0x1f: 
00043 }
00044 
00045 void KT_VFD::scroll_act(unsigned int w, unsigned int c, unsigned char s)
00046 {
00047     write_byte(0x1f) ;
00048     write_byte(0x28) ;
00049     write_byte(0x61) ;
00050     write_byte(0x10) ;
00051     write_byte(w%0x100) ;
00052     write_byte(w/0x100) ;
00053     write_byte(c%0x100) ;
00054     write_byte(c/0x100) ;
00055     write_byte(s) ;
00056 }
00057 
00058 void KT_VFD::cls()
00059 {
00060     write_byte(0x0C) ;
00061     locate(0, 0) ;
00062 }
00063 
00064 void KT_VFD::locate(unsigned int x, unsigned int y)
00065 {
00066     write_byte(0x1f) ;
00067     write_byte(0x24) ;
00068     write_byte(x % 0x100) ; // xL
00069     write_byte(x / 0x100) ; // xH
00070     write_byte(y % 0x100) ; // yL
00071     write_byte(y / 0x100) ; // yH
00072 }
00073 
00074 void KT_VFD::lf()
00075 {
00076     write_byte(0x0a) ;
00077 }
00078 
00079 void KT_VFD::cr()
00080 {
00081     write_byte(0x0d) ;
00082 }
00083 
00084 void KT_VFD::font_size(unsigned char m)
00085 {
00086     write_byte(0x1f) ;
00087     write_byte(0x28) ;
00088     write_byte(0x67) ;
00089     write_byte(0x01) ;
00090     write_byte(m) ;
00091 }
00092 
00093 void KT_VFD::char_ext(unsigned char x, unsigned char y)
00094 {
00095     write_byte(0x1f) ;
00096     write_byte(0x28) ;
00097     write_byte(0x67) ;
00098     write_byte(0x40) ;
00099     write_byte(x) ;
00100     write_byte(y) ;
00101 }
00102 
00103 int KT_VFD::_putc(int c)
00104 {
00105     if (c == '\n') {
00106         cr() ;
00107         lf() ;
00108     } else {
00109         write_byte(c) ;
00110     }
00111     return 0 ;
00112 }
00113 
00114 int KT_VFD::_getc()
00115 {
00116     return -1 ;
00117 }
00118 
00119 void KT_VFD::write_byte(unsigned char value)
00120 {
00121 #if 0
00122     bool ok ;
00123     _d[7] = 0 ;
00124     do {
00125         _rd = 0 ;
00126         wait_us(0.08) ;
00127         ok = _d[7] ;
00128         _rd = 1 ;
00129     } while (ok) ;
00130     _d[7] = 1 ;
00131 #else
00132     while (!_rd) ;
00133 #endif
00134 
00135     _d = value ;
00136     _wr = 0 ;
00137     wait_us(0.11) ;
00138     _wr = 1 ;
00139 //    wait_us(1.6) ;
00140     wait_us(16) ;
00141 }