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34 lines
1.6 KiB
Markdown
34 lines
1.6 KiB
Markdown
# Tool Introduction
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This tool is designed to interface with a test to get the random numbers generated by the using a hash of a block of uninitialized SRAM. In order to run the test a certain hardware setup is required due to the requirement to power off the DUT (device under test) for a certain time. Furthermore, the module detects button and/or software resets. If you push the reset button for example (without powering off the DUT), a warning should be printed to the console.
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# Setup
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## Required Tools
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- DUT (a supported RIOT target board)
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- USB to UART converter that supports setting the RTS pin and 5 volts (ie. FT232RL FTDI USB to TTL adapter)
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- MOSFET to control power to the DUT (ie. STP36NF06L)
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- Jumper cables
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- Solderless breadboard
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## Wiring Example
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1. RTS <--> MOSFET gate pin (FT232RL RTS - STP36NF06L 1)
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2. +5V <--> MOSFET drain pin (FT232RL 5V - STP36NF06L 2)
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3. DUT Power <--> MOSFET source pin (E15 - STP36NF06L 3)
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4. DUT UART TX <--> USB to UART RX
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5. GND <--> GND
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## Example Setup
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# Running the test
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1. Plug the USB to UART converter in (it should be done first so it can autoconnect to the serial port)
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2. Program the DUT with the puf_sram test
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3. Connect all wires
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4. change jumpers to only run on power provided by the USB to USRT converter
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5. Run the example_test.py
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# Running Custom Tests
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Different tests can be run using the get_seed_list(self, n=10000, off_time=1, allow_print=False)
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n -> the number of samples to take
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off_time -> The time that the device is powered off to properly randomize the RAM
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