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Scrolling with Multiple values in 2nd Line of LCD

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ananthashayanams

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Hi,

I have an issue with displaying multiple values on the 2nd line of 16x2 LCD. There are 4 channels of ADC which I am using to read the values & display it on LCD. The reading from the ADC is fine, but displaying it in a scroll manner only on the 2nd line is an issue. My first Line is also scrolling.



This is the code i wrote to print the ADC value on the LCD, but sometimes values mix up between 1st & 2nd line, 2 values get overwritten on the same location. Can anybody suggest which is the best way to write multiple values only in the 2nd line which is going back to back.

Code: 
void main() {
...
pic_init();
lcd_init();
...
lcd_putc(" GUI SYSTEM \n")

while(1) {
  ...
   current = average_ad(AMP_CHAN)/40.885;             		
   printf(lcd_putc," Solar Current=%6.2fA\n\r",current);

   voltage = average_ad(VOLT_CHAN)/18.2887;          	
   lcd_gotoxy(22,2);
   printf(lcd_putc," Solar Voltage=%6.2fV\n\r",voltage);

}
 

It seems you are using CCS C Compiler. You have to use

Code C - [expand]
1
2

lcd_gotoxy(0,1);  //first line
lcd_gotoxy(1,2);  //second line
 

Jayanth,

Yes, my compiler is CCS

I am using lcd_gotoxy() for moving between the lines. The first line would always display "GUI SYSTEM", while in the 2nd line I need to display 4 different values in a scrolling manner namely

a. Solar Voltage
b. Solar Current
c. Battery Voltage
d. Battery Current

As the 16x2 JHD controller is only 40 characters wide, how can we over come this situation ? I tried with only 2 values of Solar Voltage & Solar Current with the help of lcd_gotoxy(), it works fine but when the 3rd value needs to be displayed, the display is all wrong,
 

You can't display all 4 values on one line. The width will not be sufficient. I don't use CCS C. You have to use LCD left shift or right shift command to make string scroll. Try to concat all the four values and then display it and shift. If that doesn't work then you have to shift the characters of the string. Actually LCD left/right shift shifts both lines at the same time. So, you need to shift the contents of the string variable or character array.
 

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