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UART Printf problems

 
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wordizlife



Joined: 08 Mar 2012
Posts: 38
Location: Canada

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UART Printf problems
PostPosted: Sun Apr 22, 2012 10:47 am     Reply with quote
Hey guys,
I am currently trying to communicate between two PIC's.
I am successfully receiving data and displaying it on an LCD with PIC16F877A. But transmitting data through its TX pin with the use of the printf function is another story..

What I begin by doing is put the characters I want to send into an array:

Code:

char ch_str[20] = "ATZ\r";


Then count how many characters are in the array:

Code:

int chcount = strlen(ch_str);


Then I check if the device is in an idle state with the if (tempc==0x3E), and if it is then using the printf function and a for loop I send the data through the TX pin.

Code:

if (tempc==0x3E)
   {
      for (i=0; i<=chcount;i++)
      {
         printf("%s" ,ch_str[i]);
      }
   }


What I tryed doing was hooking up my USBee device to monitor the data comming out of the TX pin and noticed that there was no activity at all. So I wrote a sample code to test the printf function and there is absolutely no life from the TX pin...
What amI doing wrong? Should I be using putc() instead of printf?

Printf function test code:
Code:

#include <main.h>
#include "D:\Winter_2012\Project_2\flex_lcd.c"

void main()
{
delay_ms(5000);
printf("%c", "ATZ");
}


Thanks!
wordizlife



Joined: 08 Mar 2012
Posts: 38
Location: Canada

View user's profile Send private message

PostPosted: Sun Apr 22, 2012 12:06 pm     Reply with quote
Problem solved, it was a hardware problem with the jumper connected to the TX pin... -_-
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