UART not reading integer greater than 10

[kumar123]

Hi,
This given below code is not printing number greater than 10, for the first time if I entered 10,12,23,45,1234,..... it get stuck, second time it print repeating number(1010, 1212,2323,...).The entered number even very large number(1,2,10,23,100,230,500,1000,123234,112323435,....). when I entered single digit number, after entering digit greater than 10. It will work. For single digit number it is working.
Any suggestion would be appreciated?

Code: Select all

UART1_Init(9600); // Initialize the UART with a baud rate of 9600
    
    while(1) {
        if(UART1_Data_Ready() == 1) {
            memset(input_num, 0, 25);
            memset(output_num, 0, 25);
            UART1_Read_Text(input_num, ";", 24);
            sprintf(output_num,"%s\r\n", input_num);
        }
        UART1_Write_Text(output_num);
        Delay_ms(500);
    }

Regards,
Kumar

[IvanJeremic]

Hi,

The Uart echo example seems to process larger numbers fine for me, it tried sending 1,2,10,23,100,230,500,1000,123234,112323435 and it did it without an issue.

Regards,

Ivan.

[kumar123]

Hi Ivan,
It works for this below code:
I will read any number and print, it works fine.
Code:1

Code: Select all

While(1){ 
         if(UART1_Data_Ready()== 1){
             UART1_Read_Text(input, ";", 255);
             UART1_Write_Text(input);
         }
}

but it does not work for this below code:
Code:2

Code: Select all

While(1){ 
         if(UART1_Data_Ready()== 1){
             UART1_Read_Text(input, ";", 255);
             UART1_Write_Text(input);
         }
         else {
             UART1_Write_Text(input);
         }
}

In code :2 If I entered any number(like:12, 10,234235, ......) first time it get stuck, in second time if I entered it print duplicate of that entered number(1212,1010,234235234235).

Regards,
Kumar

[IvanJeremic]

Hi,

I am not sure what you are trying to do with the:
else {
UART1_Write_Text(input);
}

This will just keep printing everything you wrote forever, if it gets stuck it is probably because it got too much information, if it does not print everything the input string is not large enough for all the read data.

Regards,

Ivan.

[kumar123]

Hi Ivan,
I want output of this below code like- initially it print the whatever have the initial value, it will keep on printing until I entered the new integer, again it will keep on printing(old value ) value until I entered the new value and so on.
This below code works well for single digit Integer(0-9), when I read integer greater than 10, first time it get stuck, second time I read same value it print wrong value.

Code: Select all

void main(){
     char str[256] = "0";
     char st[256];
     TRISC6_bit = 0;   // Tx pin set as output
     TRISC7_bit = 1;   // Rx pin set as input

     UART1_Init(9600); // Initialize the UART with a baud rate of 9600

     Delay_ms(4);     //Wait for UART to stabilize

     while(1){
     
        if(UART1_Data_Ready() == 1){
            UART1_Read_Text(st, ";", 255);
            UART1_Write_Text(st);
             strcpy(str,st);
            UART1_Write_Text("\r\n");
            Delay_ms(1000);

        }
        else{
            UART1_Write_Text(str);
            UART1_Write_Text("\r\n");
            Delay_ms(1000);
        }
     }
 }

This is when I am reading single digit integer:

screa1.png (207.33 KiB) Viewed 291 times

This is when first time I am reading integer greater than 10 it get stuck:

scr2.png (204.46 KiB) Viewed 291 times

This is when second time enter the same integer get gives wrong value:

sc3.png (204.52 KiB) Viewed 291 times

Hope you understood the problem.

Regards,
Kumar

[kumar123]

Hi,

Does anyone have suggestion for the above query?

Regards
Kumar

[IvanJeremic]

Hi,

The MCU seems to not be able to handle this, whenever it tries to read a bit larger data it will cause this issue, I tried changing the code a bit but at best it would work clunky.

I think you should try using interrupts for this instead of If.

External Interrupt.7z

(4.03 KiB) Downloaded 16 times

Regards,

Ivan.