Circuit Cellar January 2011 by Steve Ciarcia Founder Editor

By Steve Ciarcia Founder Editor

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The RMS calculating function— which is MyFindRMS() in Listing 3 January 2011 – Issue 246 A set of more major modifications enabled the user to start recording sound with a press of the right key (VK_RIGHT, Line 23) and begin playback of the recorded audio with the left key (VK_LEFT, Line 25). The prototype was capable of recording up to 5 s of sound, determined by the size of the audio buffer. The extension to a “real” mobile application means that the audio-in device must be modified to allow recording to one buffer while the Snorecognizer performs DSP analysis 37 2011-1-016_Kotchorek_Layout 1 12/9/2010 4:46 PM Page 38 January 2011 – Issue 246 worldmags 38 worldmags (Lines 150–158)—used the signed short integers (16 bits) matching the precision provided by the Windows Mobile audio capture function.

The development kit contained a set I2C EEPROM driver and parameter management of stepper motor driver routines display unit isn’t meant to be UART Serial output buffering (not a separate task) that would work with only used while riding the bicycle. I USB Flash drive data log file creation minor modifications, so I intewas afraid it might end up being Idle Sleep until interrupt occurs grated them into the system. too much of a distraction. Table 1—These SafeRTOS tasks perform all of the sysThey were originally designed tem’s functions.

Since the LM3S9B96 board using point-to-point only has eight PWM outputs, and I wiring (see Photo 3). The Stellaris parameters that are stored in the was using two motors, I’d only have EKK-LM3S9B96 evaluation board is EEPROM. These are read when the two PWMs per winding. I found an mounted onto a set of socket pins system starts up, or they are set to H-bridge driver IC that contained that plugs into headers on the main default values if the EEPROM doesinternal logic that would allow me to n’t contain valid data.

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