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Figure 11: <strong>Mouse</strong> peripheral with embedded ADNS2051 optical processor.Figure 12: <strong>Mouse</strong> peripheral hardware to GPIO interconnection.Figure 13: FSM for left and right click.Polling State MachineTo interface with the mouse peripheral a polling state machine (PSM) is implemented in hardware on theDE2 board. The details of the PSM are given in Figure 14. As described before, the PSM communicateswith the ADNS2051 using the GPIO peripheral of the DE2. Implemented in hardware will be a serialperipheral interface (SPI) protocol for writing to and reading the registers of the ADNS2051. The registers of9
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