Wrong values are displayed on LCD

Question

I'm using Tiva c to drive an LCD but some characters and numbers are wrong displayed, for example, N is displayed as L, 2 and 3 are displayed as 0 but other characters and letters are displayed correctly.

Here is the function that displays characters:

void LCD_voidWriteCharacter(char Character)
{
    SET_BIT(GPIO_PORTA_DATA_R, 7); // RS pin is 1 -> data
    GPIO_PORTB_DATA_R = Character; 
    SET_BIT(GPIO_PORTA_DATA_R, 5); // Enable is high (latch)
    Delay_ms(2);
    CLEAR_BIT(GPIO_PORTA_DATA_R, 5); // Enable is low
}

where could be the problem? sorry for my english

score 1 · Accepted Answer · answered Mar 06 '19 at 15:13

1

Lets look at what your examples have in common:

'N' == 0100 1110
'L' == 0100 1100

'2' == 0011 0010
'3' == 0011 0011
'0' == 0011 0000

The problem always seems to be 2nd lowest bit.
And sometimes the lowest bit. (in the case of '3' turning into '0'),

I conclude you have some bad wiring connection near the lowest bits of communication from your board to the LCD screen.

answered Mar 06 '19 at 15:13

abelenky

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Thanks so much, indeed i was connecting something wrong, now it works correctly – Andy Mar 06 '19 at 15:21

Wrong values are displayed on LCD

1 Answers1