Argox PA-20 Programming Guide - Manual (Page 94)

PT-20 Programming Guide 92
i = read_com(1,c);
if (i) _printf(“char %c received from COM1”,*c);
Includes： #include “SDK.h ”
Description： This routine is used to read one byte from the receive buffer and then
remove it from the buffer. However, if the buffer is empty, no action is taken
and 0 is returned. Use the argument “port” as the connect port which is
chosen to open. You can choose 1(RS232).
Returns： 1, available or 0 if buffer is empty
write_com
Purpose： Send a string out through RS232 port
Syntax： int write_com(int port, char *s);
Example call： char s[20]={“Hello World\n”};
write_com(1,s);
Includes： #include “SDK.h ”
Description： This routine is used to send a string through RS232 ports. If any prior
transmission is still in process, it is terminated then the current transmission
resumes. The character string is transmitted one by one until a NULL
character is met. A null string can be used to terminate prior transmission.
Use the argument “port” as the connect port which is chosen to open. You
can choose 1(RS232).
If you select RS-232 and set hardware flow control(CTS/RTS), this function
will wait while data be transmitted.
Returns： -1 : error
Other value: the number of words that success writing into.
USB_Open
Purpose： Initialize and enable USB port.
Syntax： void USB_Open(void);
Example call： USB_Open();
Includes： #include “SDK.h ”
Description： The USB_Open function initializes and enable USB port.
Returns： None
USB_Close
Purpose： To close USB port
Syntax： void USB_Close(void);
Example call： USB_Close();
Includes： #include “SDK.h ”
Description： The USB_Close function disable and suspend USB port.
Returns： None