CCS C Compiler Manual PCB / PCM / PCH

PreProcessor
not used.
Purpose:
This directive tells the compiler the baud rate and pins used for serial I/O. This directive
takes effect until another RS232 directive is encountered. The #USE DELAY directive
must appear before this directive can be used. This directive enables use of built-in
functions such as GETC, PUTC, and PRINTF. The functions created with this directive
are exported when using multiple compilation units. To access the correct function use
the stream identifier.
When using parts with built-in SCI and the SCI pins are specified, the SCI will be used.
If a baud rate cannot be achieved within 3% of the desired value using the current clock
rate, an error will be generated. The definition of the RS232_ERRORS is as follows:
No UART:
Bit 7 is 9th bit for 9 bit data mode (get and put).
Bit 6 set to one indicates a put failed in float high mode.
With a UART:
Used only by get:
Copy of RCSTA register except:
Bit 0 is used to indicate a parity error.
Warning:
The PIC UART will shut down on overflow (3 characters received by the hardware with
a GETC() call). The "ERRORS" option prevents the shutdown by detecting the condition
and resetting the UART.
Examples:
Example
Files:
Also See:
#use rs232(baud=9600, xmit=PIN_A2,rcv=PIN_A3)
ex_cust.c
getc(), putc(), printf(), setup_uart( ), RS2332 I/O overview
#use rtos
(The RTOS is only included with the PCW and PCWH packages.)
The CCS Real Time Operating System (RTOS) allows a PIC
micro controller to run regularly scheduled tasks without the need
for interrupts. This is accomplished by a function (RTOS_RUN())
that acts as a dispatcher. When a task is scheduled to run, the
dispatch function gives control of the processor to that task.
When the task is done executing or does not need the processor
anymore, control of the processor is returned to the dispatch
function which then will give control of the processor to the next
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