Advantech ADAM-5511 Manual page 191

com_232_disable_fifo
com_232_enable_fifo
Syntax:
void com_232_disable_fifo(void)
int com_232_enable_fifo(void)
Description:
Sets 232 port to disable fifo receiving trigger level 1, 4, 8, 14.
Sets 232 port to enable fifo receiving trigger level 1, 4, 8, 14.
Parameter Description
None.
Return value:
0: success.
-1: fifo not available.
-10: failure to enable.
Example:
None.
Remarks:
Please refer to the 16C550 UART register document (Appendix B).