CCS C Compiler Manual PCB / PCM / PCH

Built-in Functions
putc_send( );
fputc_send( );
Syntax:
Parameters:
Returns:
Function:
putc_send();
fputc_send(stream);
stream – parameter specifying the stream defined in #USE RS232.
Nothing
Function used to transmit bytes loaded in transmit buffer over RS232.
Depending on the options used in #USE RS232 controls if function is
available and how it works.
If using hardware UARTx with NOTXISR option it will check if currently
transmitting. If not transmitting it will then check for data in transmit
buffer. If there is data in transmit buffer it will load next byte from transmit
buffer into the hardware TX buffer, unless using CTS flow control option.
In that case it will first check to see if CTS line is at its active state before
loading next byte from transmit buffer into the hardware TX buffer.
If using hardware UARTx with TXISR option, function only available if
using CTS flow control option, it will test to see if the TBEx interrupt is
enabled. If not enabled it will then test for data in transmit buffer to send.
If there is data to send it will then test the CTS flow control line and if at
its active state it will enable the TBEx interrupt. When using the TXISR
mode the TBEx interrupt takes care off moving data from the transmit
buffer into the hardware TX buffer.
If using software RS232, only useful if using CTS flow control, it will check
if there is data in transmit buffer to send. If there is data it will then check
the CTS flow control line, and if at its active state it will clock out the next
data byte.
Availability:
Requires:
Examples:
Example Files:
All devices
#USE RS232
#USE_RS232(UART1,BAUD=9600,TRANSMIT_BUFFER=50,NOTXISR)
printf(“Testing Transmit Buffer”);
while(TRUE){
putc_send();
}
None
Also See: _USE_RS232( ), RCV_BUFFER_FULL( ), TX_BUFFER_FULL( ),
TX_BUFFER_BYTES( ), GET( ), PUTC( ) RINTF( ), SETUP_UART( ),
PUTC( )_SEND
237