When interfacing SPI devices, the appropriate SPI mode should be used. The SPI modes are described here in detail: http://en.wikipedia.org/wiki/Serial_peripheral_interface
Here are some easy to use defines for use with the CCS C compiler in the setup_spi() function:
#define SPI_MODE_0_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H) //SPI Mode 0 #define SPI_MODE_0_1 (SPI_L_TO_H) //SPI Mode 1 #define SPI_MODE_1_0 (SPI_H_TO_L) //SPI Mode 2 #define SPI_MODE_1_1 (SPI_H_TO_L | SPI_XMIT_L_TO_H) //SPI Mode 3
Just put them in a header or source file somewhere and call setup_spi() like this:
setup_spi(SPI_MASTER | SPI_MODE_0_0 | SPI_CLK_DIV_4);
Note that SPI Mode 0 is a typical SPI mode. The AS1107 uses it, for example. I think it’s the most common SPI mode.