CCS C Compiler Manual PCB / PCM / PCH

Function:
Availability:
Requires:
Transfers data to and reads data from an SPI device.
All devices with SPI support.
#USE SPI
Examples:
int i = 34;
spi_xfer(i);
// transfers the number 34 via SPI
int trans = 34, res;
res = spi_xfer(trans);
// transfers the number 34 via SPI
// also reads the number coming in from SPI
Example Files: None
Also See:
#USE SPI
SPII_XFER_IN()
Syntax:
Parameters:
Returns:
Function:
Availability:
Requires:
Examples:
Example Files:
Also See:
value = spi_xfer_in();
value = spi_xfer_in(bits);
value = spi_xfer_in(stream,bits);
stream – is the SPI stream to use as defined in the STREAM=name
option in #USE SPI.
bits – is how many bits of data to be received.
The data read in from the SPI
Reads data from the SPI, without writing data into the transmit buffer first.
This function is only available on devices with SPI hardware.
#USE SPI, and the option SLAVE is used in #USE SPI to setup PIC as a
SPI slave device.
data_in = spi_xfer_in();
ex_spi_slave.c
#USE SPI, spi_xfer(), spi_prewrite(), spi_init(), spi_speed()
sprintf( )
Syntax:
sprintf(string, cstring, values...);
bytes=sprintf(string, cstring, values...)
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