Microcomputer systems 1 ECE 3551 Dipesh Patel

 Activating Filters using the pushbuttons.  Combination of LEDs turned on with each pushbutton pressed.

PushbuttonLEDs turned onFilters Active PF8 pressed onceLEDs 4,5,6 activeHighpass 1 active PF8 pressed twiceLEDs 7,8,9 activeLowpass 2 active PF8 pressed thriceNo LED activeNo filter active PF9 pressed onceLEDs 4,5,8,9 activeHighpass 2 active PF9 pressed twiceLEDs 6,7 activeLowpass 2 active PF9 pressed thriceNo LED activeNo filter active PF10 pressed onceAll LEDs activeHighpass 3 active PF10 pressed twiceLEDs 5,8 activeLowpass 3 active PF10 pressed thriceNo LEDs activeNo filter active PF 11 pressed onceLEDs 4,6,7,9 activeBandpass active PF11 pressed twiceNo LEDs activeNo filter active

 Used Matlab to design Filters.  fdatool in the Matlab pops up the window for filters.  The filters were all chebyschev type II and the order that was specified was 8.

The input x[n] and the output y[n] of an IIR filter satisfy the Nth order linear coefficient linear equation. The first coefficient of the y[k] series is 1 and therefore the 2 nd equation holds true.

 Transfer function is as follows:  The implementation takes place as follows:

 The filtering of audio signals take place in the process data.c file.  The filters are actually implemented in the process data.c file using the arrays for the filter coefficients.  The actual calling of the LEDs and pushbutton takes place in ISR.c file.

 EX_INTERRUPT_HANDLER(FlagA_ISR). Sport0 RX ISR  IVG 9  EX_INTERRUPT_HANDLER(Sport0_RX_ISR). FlagA ISR  IVG 12 The 1 st interrupt handler is caused when any of the pushbutton from PF8 to PF 11 is pressed. The 2 nd interrupt handler is caused when any of the audio signal is transferred through a buffer.

 The SPI port is disabled after initialization.  All the data transfer takes place through SPORT.

 Make sure that all the SW9 pins are on that enables the pushbuttons from PF8 – PF11.  We need to initialize the LEDs and the pushbuttons in order to use them.  The memory of LEDs should be set to 0x01 in order to use them as output.

 This project can be used in an audio recording company.  They don’t need to buy amplifiers.  The signals can be amplified as desired using the Blackfin processor, the visual DSP software and matlab.