Table of Contents

Overview

The Serial Peripheral Interface (SPI) is a synchronous serial interface that allows full duplex communication with an external SPI-compliant master or slave device. SPI devices operate in master-slave mode where the master initiates the communication and can operate in 4-wire or 3-wire mode. SPI specifies following signals:

• SCLK : Serial clock from Master to Slave
• MOSI : Serial data from master to slave
• MISO : Serial Data from slave to master
• CS : Chip select(Only in 4 wire mode)

Application details

The demo application focuses on showing the required initialization sequence to enable the CC3200 SPI module in full duplex 4-wire master and slave mode(s).

Source Files briefly explained

• main.c - Initializes the SPI module in either master or slave 4 wire mode based on macro
• pinmux.c - Generated by Pinmux utility to mux out the SPI module signal to chip boundary.
• uart_if.c - Implements the UART terminal.
• startup_*.c - Initialize vector table and IDE related functions

Usage

1. Setup a serial communication application. Open a serial terminal on a PC with the following settings:
   • Port: Enumerated COM port
   • Baud rate: 115200
   • Data: 8 bit
   • Parity: None
   • Stop: 1 bit
   • Flow control: None
2. Run the reference application.
   • Open the project in CCS/IAR. Build the application and debug to load to the device, or flash the binary using UniFlash.
3. Select master or slave mode using the serial terminal.

Limitations/Known Issues

• User should always execute master application followed by slave application to avoid slave SPI receiving garbage.