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crystal can be tested using CRO or a good multimeter capable of reading frequency of that range.
@ Paro maheswari: you dont need to insert the controller to check the crstal oscillator. check if the crystal oscillator is connected to controller properly, and see if the capacitor is grounded...
Just to make sure if the problem is with IC or the PCB, remove the IC from the socket if it is mounted on the socket and measure the voltage on the same pins. if the voltage is 0 or in the normal range of acceptance, then insert IC again, if you get the short or drop in voltage, then replace the...
while(1)
{
if(byte==8)
{
lcd_string();
}
}
this is the part of code i am talking that you are doing something in infinite loop.
@bagya: the other functions written below main has to be called from main function to be executed. As i said use debugging option and see that the code you have...
maybe you are not comfortable with C programming.
the functions void recieve();
void ready();
void get();
void delay (unsigned char);
void command (unsigned char);
void display (unsigned char);
will never execute because you have not called them from main like you have called void...
bagya;
the functions you have written below the main function like 1. void get() 2. lcd dispaly and all other functions have to be called from main function. Only if they are called from main function they will execute or else the functions will never execute and you will not get any output...
functions are never called in main. and while(1); will permanently stop the execution. you have written the functionality for many functions but never called from main.
is it the final code
yes you need to store the data in the array with new updated values of SBUF as it can store only 1 byte of data in it. then you need to compare the array with the predefined array with rfid tag values and perform the required operation, if the new array value and stored array value matches. you...
which RFID module are you using? send the picture of your module or schematic. if you dont have max232 on the rfid board then you may need one circuit for that and a max 232 at the controllerend too. what interface does your rfid module use? first connect rfid module to serial port of pc and in...
only way is to connect the gps modem to serial port of computer and use hyperterminal application and keep changing the baud rate and power on the modem , everytime you change the baud rate, for any one baud rate you should see the parameters of gps modem printed on the terminal window.
there...
Seems to be your crystal oscillator is deviating too much. Under what environment do you use the device, withiin room or in field? what if the capacitor value used for your RTC crystal 32.768KHz.
can you measure the oscillator frequency on a scope and see how much if the frequency.
first check if the hardware connections are as per the software port and pin assignment. if it is not possible the post the circuit diagram and the code you are using...........
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