• State Not Answered
  • Locked Locked
  • Replies 9 replies
  • Subscribers 22 subscribers
  • Views 2912 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

GPS SERIAL DATA PROBLEM 8051

michael dadashov

hi, i am doing gps tracking device prject but i am unable to receive any data from my EM-506 Module, i am using to the following piece of code to capture data:
void Serial_Init()
{ TMOD = 0x20; TH1 =0xF4; SCON = 0x50; TR1 = 1;
}

rx_data(void)
{ char x; while(RI==0); x=SBUF RI = 0; //lcd("2"); return x;
}

i noticed that the programm is stuck because RI never changes his state but when i measure the the voltage of p3.0 (RX pin of 8051) it changes ("0" and "1") so the cpu receives data from the gps.

thanks in advance.

Parents
  • 0 in reply to michael dadashov

    Have you done a basic transmit/receive loop-back test yet? Say sending a repetitive 'U' or 0x55 character. What does that look like on a scope? How does that compare with the signals you see from the GPS. ie form, bit-timing?

    Take the GPS out of the equation, confirm you can actually use the UART, and the flags function as expected/documented.

Reply
  • 0 in reply to michael dadashov

    Have you done a basic transmit/receive loop-back test yet? Say sending a repetitive 'U' or 0x55 character. What does that look like on a scope? How does that compare with the signals you see from the GPS. ie form, bit-timing?

    Take the GPS out of the equation, confirm you can actually use the UART, and the flags function as expected/documented.

Children
No data