File content as of revision 0:ba2d5d27fe5b:

/**
 * TEST
 * TS119-3  3.3v it is't worked.
 * TS119-5  3.3v it's worked. http://www.aitendo.com/product/5152
 * TS174    3.3v it's worked. http://www.aitendo.com/product/5153
 * http://www.holtek.com.tw/documents/10179/a33bf4b4-f0ef-4b77-94e4-3dd5d0c35f16
 * 
 * HT1621 Library
 * https://storage.googleapis.com/google-code-archive-source/v2/code.google.com/wirejungle/source-archive.zip
 * 
 * reference
 * http://jr4pdp.blog.enjoy.jp/myblog/2016/01/lcd-ts174nblpic-da92.html
 * http://morecatlab.akiba.coocan.jp/lab/index.php/2015/10/segment-lcd/
*/
#include "mbed.h"
#include "HT1621.h"
#include "7seg_fonts.h"

// ICON
#define ICON_ON true
#define ICON_OFF false
#define ICON_1 0
#define ICON_COLON 1
#define ICON_H          2
#define ICON_TIME       3
#define ICON_CAUTION    4
#define ICON_ASTERISK   5
#define ICON_POINTL     6
#define ICON_POINTR     7
#define UNIT_k          0b01000000
#define UNIT_W          0b00001111
#define UNIT_V          0b00001100
#define UNIT_A          0b00010001
#define UNIT_h          0b00100000
#define UNIT_MD         0b10000000

#define BACKLIGHT_ON    LED_A = 1
#define BACKLIGHT_OFF   LED_A = 0
#define WAIT_TIME 1

#define BIASTEST

#if defined(TARGET_ARCH_PRO)
HT1621 ht1621(D5, D4, D3, D2);
DigitalOut LED_A(D7);
DigitalOut LED_K(D6);
#elif defined(TARGET_LPC1768)
HT1621 ht1621(p24, p25, p26, p8);
DigitalOut LED_A(p10);
DigitalOut LED_K(p23);
#elif defined TARGET_NUCLEO_F446RE
HT1621 ht1621(D5, D4, D3, D2);
DigitalOut LED_A(D7);
DigitalOut LED_K(D6);
#elif defined TARGET_NUCLEO_F103RB
HT1621 ht1621(D5, D4, D3, D2);
DigitalOut LED_A(D7);
DigitalOut LED_K(D6);
#endif


#define MEM_MAX 9
uint8_t MEM[MEM_MAX] = {0,0,0,0,0,0,0,0,0};
char STR_BUF[MEM_MAX];
uint8_t bias;

void icon(uint8_t num, bool f)
{
  if (f)
  { 
    MEM[num] = MEM[num] | 0x01;  
  } else 
  {
    MEM[num] = MEM[num] & 0xFE;  
  }
}
void unit(uint8_t c)
{
  MEM[8] = c;
}

void write_char(uint8_t col, char c)
{
  uint8_t num = c -0x20;
  MEM[col] = (MEM[col] & 0x01) | fonts[num]; 
}
void write_mem()
{
  for (int i =0; i<9; i++) {
    ht1621.writeMem(i*2,  (MEM[i]>>4) & 0x0F);
    ht1621.writeMem(i*2+1, (MEM[i]) & 0x0F);
  }
}

void write_str(char *st)
{
  int stl, i, n;
  char c;
  stl = strlen(st);
  n =0;
  icon(ICON_COLON, ICON_OFF);  
  icon(ICON_POINTL, ICON_OFF);
  icon(ICON_POINTR, ICON_OFF);
  for (i=0; i<stl; i++) {
    c = *st++;
    if (c == ':') {
      icon(ICON_COLON, ICON_ON);
    }
    else if (c == '.') {
      if (n == 6) {
        icon(ICON_POINTL, ICON_ON);
      } else if (n == 7) {
        icon(ICON_POINTR, ICON_ON);
      }
    }
    else
    {
      write_char(n, c);
      n++;
    }
  }
}

void clear_mem(uint8_t data)
{
  for (int i = 0; i<MEM_MAX;i++){
    MEM[i] = data;
  }
  write_mem();
}

int main() {
    ht1621.sendCommand(ht1621.BIAS_THIRD_4_COM);
    LED_K = 0;
    while(1) {
        BACKLIGHT_ON;
        write_char(0, '0');
        write_char(1, '1');
        write_char(2, '2');
        write_char(3, '3');
        write_char(4, '4');
        write_char(5, '5');
        write_char(6, '6');
        write_char(7, '7');
        write_mem();
        wait(WAIT_TIME);
        write_char(0, '8');
        write_char(1, '9');
        write_char(2, 'A');
        write_char(3, 'B');
        write_char(4, 'C');
        write_char(5, 'D');
        write_char(6, 'E');
        write_char(7, 'F');
        write_mem();
        wait(WAIT_TIME);
        write_char(0, 'G');
        write_char(1, 'H');
        write_char(2, 'I');
        write_char(3, 'J');
        write_char(4, 'K');
        write_char(5, 'L');
        write_char(6, 'M');
        write_char(7, 'N');
        write_mem();
        wait(WAIT_TIME);
        write_char(0, 'O');
        write_char(1, 'P');
        write_char(2, 'Q');
        write_char(3, 'R');
        write_char(4, 'S');
        write_char(5, 'T');
        write_char(6, 'U');
        write_char(7, 'V');
        write_mem();
        wait(WAIT_TIME);
        write_char(0, 'W');
        write_char(1, 'X');
        write_char(2, 'Y');
        write_char(3, 'Z');
        write_char(4, ' ');
        write_char(5, '-');
        write_char(6, '=');
        write_char(7, ' ');
        write_mem();
        wait(WAIT_TIME);
        write_char(0, '!');
        write_char(1, '"');
        write_char(2, '#');
        write_char(3, '$');
        write_char(4, '%');
        write_char(5, '&');
        write_char(6, '\'');
        write_char(7, '(');
        write_mem();
        wait(WAIT_TIME);
        write_str("0123:45.67");
        write_mem();
        wait(WAIT_TIME);
        write_str(" 999887.1");
        write_mem();
        wait(WAIT_TIME);
        icon(ICON_1, ICON_ON);
        icon(ICON_COLON, ICON_ON);
        icon(ICON_H, ICON_ON);
        icon(ICON_TIME, ICON_ON);
        icon(ICON_CAUTION, ICON_ON);
        icon(ICON_ASTERISK, ICON_ON);
        icon(ICON_POINTL, ICON_ON);
        icon(ICON_POINTR, ICON_ON);
        unit(UNIT_k|UNIT_A|UNIT_h|UNIT_MD);
        write_mem();
        wait(WAIT_TIME);
        BACKLIGHT_OFF;
        clear_mem(0x00);
        wait(WAIT_TIME);
        for (bias = 0 ; bias<0x10; bias++) {
        #ifdef BIASTEST
            ht1621.sendCommand(0b00100000|bias);
            #endif
            sprintf(STR_BUF, "8888%4d", bias);
            write_str(STR_BUF);
            write_mem();
            wait(WAIT_TIME);
        }
    }
}