CCS C Compiler Manual PCB / PCM / PCH

Built-in Functions
spi_write( ) spi_write2( )
Syntax:
Parameters:
Returns:
Function:
Availability:
Requires:
spi_write([wait],value);
spi_write2([wait],value);
value is an 8 bit int
wait- an optional parameter specifying whether the function will wait for the
SPI transfer to complete before exiting. Default is TRUE if not specified.
Nothing
Sends a byte out the SPI interface. This will cause 8 clocks to be generated.
This function will write the value out to the SPI. At the same time data is
clocked out data is clocked in and stored in a receive buffer. spi_read() may
be used to read the buffer.
This function is only available on devices with SPI hardware.
Nothing
Examples:
spi_write( data_out );
data_in = spi_read();
Example Files:
Also See:
ex_spi.c
spi_read(), spi_data_is_in(), SPI Overview, spi_write_16(), spi_read_16()
spi_xfer( )
Syntax:
Parameters:
Returns:
spi_xfer(data)
spi_xfer(stream, data)
spi_xfer(stream, data, bits)
result = spi_xfer(data)
result = spi_xfer(stream, data)
result = spi_xfer(stream, data, bits)
data is the variable or constant to transfer via SPI. The pin used to
transfer data is defined in the DO=pin option in #use spi. stream is the
SPI stream to use as defined in the STREAM=name option in #USE
SPI.
bits is how many bits of data will be transferred.
The data read in from the SPI. The pin used to transfer result is defined
in the DI=pin option in #USE SPI.
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