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Pre-Processor
collector outputs. Bit 6 in RS232_ERRORS is set if
the pin is not high at the end of the bit time.
ERRORS
SAMPLE_EARLY
RETURN=pin
MULTI_MASTER
LONG_DATA
DISABLE_INTS
STOP=X
TIMEOUT=X
SYNC_SLAVE
Used to cause the compiler to keep receive errors
in the variable RS232_ERRORS and to reset
errors when they occur.
A getc() normally samples data in the middle of a
bit time. This option causes the sample to be at the
start of a bit time. May not be used with the UART.
For FLOAT_HIGH and MULTI_MASTER this is the
pin used to read the signal back. The default for
FLOAT_HIGH is the XMIT pin and for
MULTI_MASTER the RCV pin.
Uses the RETURN pin to determine if another
master on the bus is transmitting at the same time.
If a collision is detected bit 6 is set in
RS232_ERRORS and all future PUTC's are
ignored until bit 6 is cleared. The signal is checked
at the start and end of a bit time. May not be used
with the UART.
Makes getc() return an int16 and putc accept an
int16. This is for 9 bit data formats.
Will cause interrupts to be disabled when the
routines get or put a character. This prevents
character distortion for software implemented I/O
and prevents interaction between I/O in interrupt
handlers and the main program when using the
UART.
To set the number of stop bits (default is 1). This
works for both UART and
non-UART ports.
To set the time getc() waits for a byte in
milliseconds. If no character comes in within this
time the RS232_ERRORS is set to 0 as well as the
return value form getc(). This works for both UART
and non-UART ports.
Makes the RS232 line a synchronous slave,
making the receive pin a clock in, and the data pin
the data in/out.
129
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