Serial Port Complete - Latest Microcontroller projects

Ports for Embedded Systems

 unsigned char serial_in;

while(1)

{

// Task loop.

receive_serial_data();

// Call routines to perform other tasks.

}

void receive_serial_data(void)

{

unsigned char serial_in;

if DataRdyUSART()

{

// A byte is available.

serial_in = getcUSART();

// Do something with the received byte.

}

}

5     &

When expecting multiple bytes, firmware can wait for the bytes to arrive or read

and store individual bytes until all have arrived.

 An hserin statement can wait to receive a specified number of bytes to store in a
byte array. This example waits for 7 bytes and stores each received byte in
sequence in received_text:
received_text var byte[7]

hserin [STR received_text\7]

A receiving computer can’t guarantee that a remote computer will send the

desired number of bytes. Using a timeout will keep the code from hanging for-

ever while waiting for bytes to arrive.

received_text var byte[7]

hserin 1000, continue, [STR received_text\7]

continue: