Embedded Systems Design

1
Embedded Systems Design

• Weekly Report

2
Assignments From Last Week

• Team Sensors/EM
• Yoshi
• Matt
• Luis
• Hardware Search
• Dave
• Dave
• Brendan
• Software
• Dan
• Dan

3
Team EM

• Figure out all the EM equations/math
• Determine how much power, cost, size, etc sensors
  require.
• Correlations between power, cost, frequency, etc.

4
Hardware Search

• Determine what processing unit to use.
• FPGA with or without IP
• Micro/DSP
• FPGA with external Micro/DSP

5
Software

• Determine the complexity of the software. This
  greatly effects the needed hardware.
• Review Kens code for sound card demo
• Get an accurate assessment of computational
  complexity.

6
Block Diagram
7
EM Progress

• 3 unique frequencies, one for each coil.
• Digital pulse to kick each coil

8
Software Conclusions -gt Hardware Implications

• Approximately 97 mathematical operations to
  determine 2D coordinates from sin amplitude/phase
  info.
• 1 exp
• 7 sqrts
• 1 divide
• 49 multiplies
• 39 adds

9
Software Assumptions -gt Hardware Implications

• Assume at minimum 1-2 orders of magnitude more
  math ops for 3D.
• Assume maximum of 100 updates/second.
• Assume worst case ball park guess of 10000
  assembly instructions per cycle.
• 5-10 MIPS processor needed.

10
ADC/DAC Info

• 10001 dynamic range on distance alone.
• Rotation adds at least an order of magnitude.
• ADC resolution of 16 bits min needed (65536)

11
Current Hardware Thoughts

• Blackfin (BF-531)
• Cheap 5, powerful (400 MHz, 800 MACS).
• Power hungry (40ish mA)
• Lack of analog peripherals/USB controller.
• 16 bit
• ARM
• Lots of analog peripherals
• Powerful
• More expensive
• 32 bit
• PICDSP
• Freescale

12
Immediate Goals for Next Week

• Better grasp of sensor design/cost/power
  consumption/correlation between all variables.
• Solid understanding of EM calculation
  complexity.
• Much better grasp on software complexity/resulting
  hardware requirements.
• Select processor/order development kit by
  Wednesday 9/28

13
Roadmap for Next Few Weeks

• Create sound card prototype so that software can
  be developed/algorithm perfected.
• In parallel develop hardware prototype that talks
  to the PC as though it is a mouse.
• Sensor prototype.