read text file in a SD card line by line and display those strings on LCD one by one

[akhs]

i want is to read line by line in a text file of a SD card and display those strings one by one on a LCD display.

first i tried to display strings in 2 lines separately but i was unable to do it,the below code what i developed is only display the 2nd line string........

// LCD module connections
sbit LCD_RS at LATB4_bit;
sbit LCD_EN at LATB5_bit;
sbit LCD_D4 at LATB0_bit;
sbit LCD_D5 at LATB1_bit;
sbit LCD_D6 at LATB2_bit;
sbit LCD_D7 at LATB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections

// SD module connections
sbit Mmc_Chip_Select           at LATC0_bit;  // for writing to output pin always use latch (PIC18 family)
sbit Mmc_Chip_Select_Direction at TRISC0_bit;
// End SD module connections

unsigned long  i,k, size;
char           filename[14] = "ASML.TXT";          // File names
char character[]="";





void main(){

ADCON1 |= 0x0D;             // Configure AN0 and AN1 pins as analog
CMCON  |= 7;                // coparators off

TRISB = 0x00;               //PORTB output
Delay_ms(100);

//Initialize LCD
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR);
Lcd_Cmd(_LCD_CURSOR_OFF );
Lcd_Out(1, 1, "Status:");
Lcd_Cmd(_LCD_SECOND_ROW);


// Initialize SPI1 module
SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV64, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);

// use fat16 quick format instead of init routine if a formatting is needed
if (Mmc_Fat_Init() == 0) {

// reinitialize spi at higher speed
SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV4, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);


//error = Mmc_Fat_Assign(&filename, 0);
Mmc_Fat_Assign(&filename, 0);

Mmc_Fat_Reset(&size);            // To read file, procedure returns size of file

for (i = 1; i <= size; i++) {
Mmc_Fat_Read(&character);

}

while(character[k]!='\r')   //break when find "\r"
k++;
k++;
k++;

Lcd_Out(2,1,&character[k]);



}else{
//Lcd_Cmd(_LCD_CLEAR);
//Lcd_Cmd(_LCD_CURSOR_OFF );
//Lcd_Out(1,2,"MMC init not OK");

}

}

in here i used character of "\r" carriage return to separately identify the two strings, but i can not display the string in the first line and display the 2nd line string at next
thank you.........

 

[internetuser2k12]

Why are you incrementime k 3 times in the while loop for every check.. That way you will miss some chars. i.e., some chars will not be checked. Just use one k++ in the while loop. Actully it displays so fast that you are seeing only the end of the string read. insert a delay after displaying

Change

 char character[]="";

to

 char character[512]="";

use a counter to count 0 to 15 inside the while loop and whenever the counter becomes 15 display read characters on lcd and give a delay of 1 sec and then reset the counter to 0 and repeat the process.