Comtrol eCos - Manual (Page 375)

Chapter 16. Serial driver details
CYG_IO_SET_CONFIG_SERIAL_WRITE_BLOCKING
Buf type:
cyg_uint32 (values 0 or 1)
Function:
This function will set the blocking-mode for write calls on this device. This call is only available if the
configuration option
CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING is enabled.
TTY driver
Use the include file < cyg/io/ttyio.h > for this driver.
This driver is built on top of the simple serial driver and is typically used for a device that interfaces with humans
such as a terminal. It provides some minimal formatting of data on output and allows for line-oriented editing on
input.
Runtime configuration
Runtime configuration is achieved by exchanging data structures with the driver via the cyg_io_set_config()
and cyg_io_get_config() functions.
typedef struct {
cyg_uint32 tty_out_flags;
cyg_uint32 tty_in_flags;
} cyg_tty_info_t;
The field tty_out_flags is used to control what happens to data as it is send to the serial port. It contains a
bitmap comprised of the bits as defined by the CYG_TTY_OUT_FLAGS_xxx values below.
#define CYG_TTY_OUT_FLAGS_CRLF 0x0001 // Map ’\n’ = > ’\n\r’ on output
If this bit is set in tty_out_flags , any occurrence of the character "\n" will be replaced by the sequence "\n\r"
before being sent to the device.
The field tty_in_flags is used to control how data is handled as it comes from the serial port. It contains a
bitmap comprised of the bits as defined by the CYG_TTY_IN_FLAGS_xxx values below.
#define CYG_TTY_IN_FLAGS_CR 0x0001 // Map ’\r’ = > ’\n’ on input
If this bit is set in tty_in_flags , the character "\r" (“return” or “enter” on most keyboards) will be mapped to
"\n".
#define CYG_TTY_IN_FLAGS_CRLF 0x0002 // Map ’\n\r’ = > ’\n’ on input
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