AFE031 PLC Modem

Hello Rebanta,

We do not have code examples specifically for the AFE031.  However, the basic SPI hardware modules built into the TIVA embedded processor you've selected will directly interface with the AFE031.  

First, configure the SPI clock frequency, clock edge, and phase registers based on the information on pages 11 and 12 of the AFE031 datasheet.  

There are two basic modes of communication based on the status of the "DAC" pin (pin 7).  

1.)  DAC pin LOW:  

When the DAC pin is LOW, the AFE031 communicates over a 4-wire SPI interface as described in the "SERIAL INTERFACE" section of the product datasheet (page 35).  It is a 16-bit protocol with a read/write bit (R/W) followed by a 7-bit address and an 8-bit data word.  An example of this is shown below (top row shows bit index):

2.)  DAC pin HIGH:

When the DAC pin is high the data sent over the SPI bus is directed straight to the DAC register without the need for addressing.  This is a 10-bit communication protocol as shown in Figure 35 in the datasheet.  Since most processors send data out in 8-bit increments, configure the processor for two 8-bit words to send out 16-bits to the AFE031.  The first 10 bits will be the DAC data and the 6 LSBs will be truncated and ignored.