==== Useful Functions ==== 1. reading and writing to the codec. 2. reading from the sram - 16b 3. reading from the sram - 18b 4. writing to the sram - 16b 5. writing to the sram - 18b 6. sampling the switch to change functions - no initialization 7. sampling the switch to change functions - with initialization 8. initialization routine 9. 16b signed x 16b signed to (16b or 32b) signed number 10. 16b signed x 8b unsigned to (16b or 24b) signed number 11. 16b signed x 16b unsigned to (16b or 32b) signed number 12. two's complement of 16b number 13. two's complement of 24b number 14. adding signed numbers of different lengths