Coala : Dynamic Task-Based Intermittent Execution for Energy-Harvesting Devices

Coala is a task-based programming and executing model for energy-harvesting battery-less devices. Coala applications should be written a chain of tasks. Coala runtime library protects applications data against power interrupts.

Programming interface

• A Coala's task should be declared as COALA_TASK(<task name>, <task weight>).
• A global Coala's variable should be declared as COALA_PV(<data type>, var).
• A global protected variable should be accessed with WP(var) for write and RP(var) for read.
• The macro coala_next_task(<next task>) should be used to transition from one task to another.
• Coala's scheduler is invoked with coala_run()

Linker modification

Change

ROM (rx)         : ORIGIN = 0x4400, LENGTH = 0xBB80 /* END=0xFF7F, size 48000 */

with

ROM (rx)         : ORIGIN = 0x4400, LENGTH = 0x7B70 /* END=0xBF7F, size 48000 */
PRS (rx)         : ORIGIN = 0xBF70, LENGTH = 0x400f /* END=0xFF7F, size 8016 */

Developing applications with Coala

• Coala library and applications can be build with GCC or Clang.
• To build an application cd to Coala-Repo\apps\<app> and write Make.
• To build Coala library cd to Coala-Repo\coala write Make.
• Coala's repository structure:

Coala-Repo
│
├── apps
│   └── app
│        ├── app.c
│        └── Makefile
├── coala
│   ├── Makefile
│   ├── include
│   ├── linkerScripts
│   └── src
├── libs
├── maker
└── targetConfigs
    └── MSP430FR5969.ccxml