Difference between revisions of "Facedancer"
m (→Why?) |
m (→Why?) |
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| Line 11: | Line 11: | ||
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn |
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn |
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where the first two chips are only converting busses: |
where the first two chips are only converting busses: |
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| + | USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn |
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| − | USB |
+ | USB <> UART <> SPI ... (USB) |
BoM view (excluding taxes, Farnell prices): |
BoM view (excluding taxes, Farnell prices): |
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| + | USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn |
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USBconn + 5.45€ + 13.03€ + 8.27€ + USBconn |
USBconn + 5.45€ + 13.03€ + 8.27€ + USBconn |
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So 18.48€ to talk SPI over UART over USB while the Raspberry-Pi has natively SPI, hmmm. |
So 18.48€ to talk SPI over UART over USB while the Raspberry-Pi has natively SPI, hmmm. |
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<br>Bus speed view: |
<br>Bus speed view: |
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| + | USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn |
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| − | 12MB/s |
+ | 12MB/s 115200bauds 26MHz |
<br>Let's try to make a RPi extension board with only the MAX3420E. And to save a few cents and construction pain let's replace the USB connector by a USB cable from a cannibalized mouse. So: |
<br>Let's try to make a RPi extension board with only the MAX3420E. And to save a few cents and construction pain let's replace the USB connector by a USB cable from a cannibalized mouse. So: |
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RPI-MODA-256M -- MAX3420E -- USBcable |
RPI-MODA-256M -- MAX3420E -- USBcable |
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From a BoM point of view this becomes (depending on what you add to the RPi, nice casing etc): |
From a BoM point of view this becomes (depending on what you add to the RPi, nice casing etc): |
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| − | + | RPI-MODA-256M -- MAX3420E -- USBcable |
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| + | 27.66€ + 8.27€ |
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Bus speed view: |
Bus speed view: |
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| + | RPI-MODA-256M -- MAX3420E -- USBcable |
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26MHz |
26MHz |
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And we get a fully autonomous facedancer which can be even powered over USB and controlled remotely |
And we get a fully autonomous facedancer which can be even powered over USB and controlled remotely |
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Revision as of 10:56, 25 April 2013
Links
- http://travisgoodspeed.blogspot.be/2012/07/emulating-usb-devices-with-python.html
- http://blog.opensecurityresearch.com/2012/11/solder-time-facedancer11-and-goodfet41.html
- http://goodfet.sourceforge.net/hardware/facedancer11/
Merging Facedancer & Raspberry-Pi
Why?
Facedancer11 is a one-purpose version of the flexible GoodFET board.
It was well designed to move all the intelligence into the host controller, not in the embedded uC.
Facedancer11 hardware can be seen as:
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
where the first two chips are only converting busses:
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
USB <> UART <> SPI ... (USB)
BoM view (excluding taxes, Farnell prices):
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn USBconn + 5.45€ + 13.03€ + 8.27€ + USBconn
So 18.48€ to talk SPI over UART over USB while the Raspberry-Pi has natively SPI, hmmm.
Bus speed view:
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
12MB/s 115200bauds 26MHz
Let's try to make a RPi extension board with only the MAX3420E. And to save a few cents and construction pain let's replace the USB connector by a USB cable from a cannibalized mouse. So:
RPI-MODA-256M -- MAX3420E -- USBcable
From a BoM point of view this becomes (depending on what you add to the RPi, nice casing etc):
RPI-MODA-256M -- MAX3420E -- USBcable
27.66€ + 8.27€
Bus speed view:
RPI-MODA-256M -- MAX3420E -- USBcable
26MHz
And we get a fully autonomous facedancer which can be even powered over USB and controlled remotely
Schematics
TODO
x x P3 Vcc P1 3v3 -- 0.1uF -- GND P4 Vcc P1 3v3 / P5 GND \ P P6 GND / x x x P10 -RST P15-GPIO22 P11 SCLK P12 -CS P13 MISO P14 MOSI x x (P17 INT) P18 GND P19 GND P20 -- 33 -- USB D- P21 -- 33 -- USB D+ P22 Vcc -- 1uF -- GND P23 Vcc P24 USB VBUS -- 1uF -- GND x P26 XTal -- 18pF -- GND P27 XTal -- 18pF -- GND x x x x x