Serial Port Complete - Latest Microcontroller projects

Ports for Embedded Systems

 The getsUSART function can read multiple characters but requires specifying
how many characters to read and blocks until all of the characters arrive:
char received_data[8];

getsUSART(received_data, 8);

To read a string without blocking, firmware can call the getcUSART function

repeatedly to read individual bytes into a char array. A task loop can call the

routine below to read a specified number of bytes into an array:

byte index;

void receive_serial_data(void)

{

byte bytes_to_read;

char received_data[8];

bytes_to_read = 8;

if DataRdyUSART()

{

// A byte is available. Read it into the array.

received_data[index] = getcUSART();

// Increment the position in the array.

index++;

if (index == bytes_to_read)

{

// Do something with the received bytes.

// Reset the index for the set of received bytes.

index = 0;

}

}

      

    $



A defined terminating character can indicate the end of a command, string, or

other block of data. The examples below check for a CR character (0Dh) in

received data.