Overview

• Authors: Prithvi Bhat (pnb3598@mavs.uta.edu) Jason Losh (jlosh@uta.edu)
• Target Board: TI TM4C123G Launchpad
• Target uC: TI EK-TM4C123GXL

Some of these projects were developed as part of my course at UT Arlington under the guidance of Dr Jason Losh

Requirements

• All projects are developed on the Code Composer Studio IDE and should be compatible as is

SPI

• Expander: MCP23S08

Summary

• Push button connected to MCP23S08 triggers an interrupt
• Interrupt propagated to TM4C123GXL via SPI
• ISR in TM4C123GXL flips LEDs, also interfaced to MCP23S08 over SPI
• SPI interface is configured for operation at a 2 MHz rate

I2C

• Expander: MCP23008

Summary

• Push button connected to MCP23008 triggers an interrupt
• Interrupt propagated to TM4C123GXL via I2C
• ISR in TM4C123GXL flips LEDs, also interfaced to MCP23008 over I2C
• SPI interface is configured for operation at a 100 kHz rate

RTC

• Uses the internal RTC module on the microcontroller

Summary

• Uses the two push buttons on the Tiva-C launchpad - one to put the board in low power hibernation and one to wake and resume normal operation
• Configures the RTC and hibernation modules appropriately to act on the button presses