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lcd project at stm32

Hi, I'm new in embedded system,I've stm32f100rb and I want to display a string at an lcd named jhd162a 16x2, but when I test it, the lcd always display a black line,I test it with an empty board and it's the same problem, one black line.
anyone have an idea please???
and thank you.

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0 jameel picabrook over 12 years ago

u dont do the display init properly. do it properly.
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0 jameel picabrook over 12 years ago

u dont do the display init properly. do it properly.
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0 Sahsinho Houssem over 12 years ago in reply to jameel picabrook

this is my init function:

 void lcd_init(void)
{
  volatile unsigned char i = 0;
  volatile unsigned int delayCnt = 0;
        RCC_APB2PeriphClockCmd(LCD_CLK_LINE, ENABLE);
  GPIO_InitStructure.GPIO_Pin = LCD_D4|LCD_D5|LCD_D6|LCD_D7|LCD_RS|LCD_RW|LCD_EN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_Init(LCD_GPIO, &GPIO_InitStructure);

  GPIO_ResetBits(LCD_GPIO, LCD_RS | LCD_EN | LCD_RW);

  for(delayCnt = 0; delayCnt < 300000; delayCnt++);

  for(i = 0; i < 3; i++) {
    lcd_writenibble(0x03);
    for(delayCnt = 0; delayCnt < 30000; delayCnt++);
  }

  lcd_writenibble(0x02);

  for(delayCnt = 0; delayCnt < 6000; delayCnt++);

  lcd_writecommand(HD44780_FUNCTION_SET |
                   HD44780_FONT5x7 |
                   HD44780_TWO_LINE |
                   HD44780_4_BIT);

  lcd_writecommand(HD44780_DISPLAY_ONOFF |
                   HD44780_DISPLAY_OFF);

  lcd_writecommand(HD44780_CLEAR);

  lcd_writecommand(HD44780_ENTRY_MODE |
                   HD44780_EM_SHIFT_CURSOR |
                   HD44780_EM_INCREMENT);

  lcd_writecommand(HD44780_DISPLAY_ONOFF |
                   HD44780_DISPLAY_ON |
                   HD44780_CURSOR_OFF |
                   HD44780_CURSOR_NOBLINK);

}