The function calls included in the directory LIBRARY are described in the following pages.
comm_init
Syntax:
int comm_init(int buf_size)
Function description:
Initializes the communication port and interrupt routine before other function calls use the communication
port.
Parameter
Description
int buf_size
Sets the buffer size of every communication port for storage of received
data. The unit of size is bytes.
Return:
Returns a 1 if command succeeds. Returns a 0 if it fails.
comm_exit
Syntax:
int comm_exit()
Function Description:
If a user calls the
comm_init
function, the user must call this function to release the communication port
before the user's program terminates.
Return:
Returns a 1 if command succeeds. Return a 0 if it fails.
comm_open
Syntax:
int comm_open(unsigned char port, unsigned long baud, int parity, int data, int stop, int cmd_type)
Function Description:
To open a communication port for user to send and receive data.
Parameter
Description
unsigned char port
Specifies communication port.
1: COM1 port
2: COM2 port
unsigned long baud
Baud rate setting. The eight allowable baud rates are: 1200, 2400, 4800,
9600, 19200, 38400, 57600, and 115200. Sized in bps (bits per second).
int parity
Parity setting.
0: no parity, 1: odd, 2: even
int data
Data bits setting. There are four allowable data lengths: 8, 7, 6, and 5.
Sized in bit units.
