ESP8266 Community Forum

- Thu Jun 02, 2016 4:49 pm #48480
code: https://github.com/krzycho1024/esp8266_usb_wiretap

Small proof of concept that ESP can dump USB packets and send them over IP.
Other name of this: IoT keyboard

- Mon Jun 06, 2016 5:35 pm #48679 Very nice, actually kind of incredible it has the horse power to do that and get it across. Must be a sweet piece of code to handle the USB frames.

- Tue Jun 07, 2016 8:30 am #48705 Very interesting! Do you think it would be possible to extend it into an universal usb-over-wifi bridge?

- Tue Jun 07, 2016 9:13 am #48708 Collecting samples:

Code: Select all   for (i = 0; i < 600 && pos < 128; i++)
   {
      state[pos] = getState(GPIO_REG_READ(GPIO_IN_ADDRESS));
      stateTick[pos] = get_ccount();
      if (state[pos] != state[pos - 1])
      {
         pos++;
      }
   }


takes about 40-42 cycles@160mhz between getState(depends on IF in getState)

only usb 1.1 1.5mbps(low speed) devices could be supported- 106.6 cycles@160mhz between state changes

I'm working to connect USB low speed keyboard to ESP directly.

If someone is interested what is sent over wire when device gets connected:

Code: Select all802d0010
80c38006000100004000dd94
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804b12011001000000081177
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80c38006000100001200e0f4
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804b12011001000000081177
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80c3800600020000ff00e9a4
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804b09023b00020103a00825
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80c32d090400000103017401
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804b010209211001000175a6
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80c322410007058103088923
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804b000a090401000103a4c0
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80c30000020921100100687e
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804b01229f00070582035041
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804b0000
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80c3800600030000ff00d464
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804b040309040978
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804b1a035500530042002066
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80c320004b00650079008f0b
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804b62006f00610072000a06
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804b0000
80d2


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