NHD-C12864LZ-FSW-FBW-3V3

alexandra

• January 12, 2015 08:07

Hello, I use a LCD NHD-C12864LZ-FSW-FBW-3V3 ( ST7565R-G controller).
I use the SPI transmission, with the STM32VLDISCOVERY board (STM32F100RB).
When I do initialization appear few pixels ON after "DISPLAY ON = 0xAF" command.
I use this function for clear the screen.

""void glcd_blank(void)
 {
     uint8_t p, c;
         for(p = 0; p < 8; p++)
         {
             lcd_cmd_out(CMD_SET_PAGE | p);
             for(c = 0; c < 129; c++)
             {
                 lcd_cmd_out(CMD_SET_COLUMN_LOWER | (c & 0xf));
                 lcd_cmd_out(CMD_SET_COLUMN_UPPER | ((c >> 4) & 0xf));
                 lcd_data_out(0x0);
             }
         }
}"

and it works but ... not it works other function "lcd_cmd_out(CMD_SET_ALLPTS_ON); // 0xA5" the screen is clear, it nothing happens.
Can you help me ? 

0

• 

  Michael_L

  • January 12, 2015 09:07

  Can you try toggling sending commands A4 and A5 in 1 second intervals?  Do you see the pixels changing?  What about if you send A6 or A7 beforehand?

  0
• 

  alexandra

  • January 13, 2015 09:07

  I tried to send, but does not change the pixels, these is my commands for initialization:

  "void lcd_init(void)
  {
     LCD_A0_L();
     LCD_N_CS1_L();
      LCD_N_RES_L();
     delay_ms(500);
  
     // Do a hard reset of the LCD display controller
       LCD_N_RES_H();
  
       //comm
       lcd_cmd_out(CMD_INTERNAL_RESET); // Soft reset
       lcd_cmd_out(CMD_SET_BIAS_9);      // SET BIAS 1/9
       lcd_cmd_out(CMD_SET_ADC_NORMAL); // ADC segment driver direction (Normal )
       lcd_cmd_out(CMD_SET_COM_REVERSE); // COM DIRECTION - REVERSE
       lcd_cmd_out(CMD_SET_RESISTOR_RATIO); // Resistor ratio
       lcd_cmd_out(CMD_SET_POWER_CONTROL); // Power control set
       lcd_cmd_out(CMD_SET_VOLUME_FIRST); // Electronic volume mode set
       lcd_cmd_out(CMD_SET_VOLUME_SECOND); // Electronic volume register set
       lcd_cmd_out(CMD_SET_DISP_START_LINE); // Operating mode
  
       // After display on appear few pixels ON .....
       lcd_cmd_out(CMD_DISPLAY_ON); // Display ON/OFF - set to ON
  
       delay_ms(1000);
       lcd_cmd_out(CMD_SET_DISP_NORMAL); // A6
       delay_ms(1000);
       lcd_cmd_out(CMD_SET_DISP_NORMAL); // // A7
       delay_ms(1000);
  
       lcd_cmd_out(CMD_SET_ALLPTS_NORMAL);// A4
       delay_ms(1000);
       lcd_cmd_out(CMD_SET_ALLPTS_ON); //A5 HERE ALL THE PIXELS ARE ON
       delay_ms(1000);
  }
  //glcd_blank();

  That's why I used glc_blank function after initialization. But after this function does not work anymore else.

  0
• 

  Michael_L

  • January 14, 2015 09:07

  So, with your setup and initialization, you are able to write pixel data to the display successfully?  It seems you are able to clear the screen by writing 0's, but are not able to use those particular commands.  Can you write all 1's to the display to see if you are able to turn all the pixels on that way?  Do you have another display to try those commands that aren't working for you?

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• 

  alexandra

  • January 14, 2015 10:07

  When I used the function:

  "void lcd_init(void)
  {
      LCD_A0_L();
      LCD_N_CS1_L();
       LCD_N_RES_L();
      delay_ms(500);
      // Do a hard reset of the LCD display controller
        LCD_N_RES_H();
  
        //comm
        lcd_cmd_out(CMD_INTERNAL_RESET); // Soft reset
        lcd_cmd_out(CMD_SET_BIAS_9);       // SET BIAS 1/9
        lcd_cmd_out(CMD_SET_ADC_NORMAL); // ADC segment driver direction (Normal )
        lcd_cmd_out(CMD_SET_COM_REVERSE); // COM DIRECTION - REVERSE
        lcd_cmd_out(CMD_SET_RESISTOR_RATIO); // Resistor ratio
        lcd_cmd_out(CMD_SET_POWER_CONTROL); // Power control set
        lcd_cmd_out(CMD_SET_VOLUME_FIRST); // Electronic volume mode set
        lcd_cmd_out(CMD_SET_VOLUME_SECOND); // Electronic volume register set
        lcd_cmd_out(CMD_SET_DISP_START_LINE); // Operating mode
  
        // After display on appear few pixels ON
        lcd_cmd_out(CMD_DISPLAY_ON); // Display ON/OFF - set to ON
        delay_ms(1000); // 1 second
        lcd_cmd_out(CMD_SET_ALLPTS_ON); // All pixels ON
  }"
  Appear few pixels ON. (Attach photo)
  But after 1 second the command "CMD_SET_ALLPTS_ON" = 0xA5 it works. (Attach photo)
  
  Because of this, I used this function (after lcd_init(void):
  "void glcd_blank(void)
   {
       uint8_t p, c;
           for(p = 0; p < 8; p++)
           {
               lcd_cmd_out(CMD_SET_PAGE | p);
               for(c = 0; c < 129; c++)
               {
                   lcd_cmd_out(CMD_SET_COLUMN_LOWER | (c & 0xf));
                   lcd_cmd_out(CMD_SET_COLUMN_UPPER | ((c >> 4) & 0xf));
                   lcd_data_out(0x0);
               }
           }
   }"

  But when I used "glcd_blank();" the screen is clear, but another function not working.
  For example I want use command "CMD_SET_ALLPTS_ON = 0xA5" after "glcd_blank();". No it works.
  
  I not have another LCD for test.

  0
• 

  alexandra

  • January 14, 2015 12:07

  If you want, I attach my project or send it by mail.

  0

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