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Plan of attack

  • Add a slammer button
  • Get sound output working
  • Hook up buzzer via mosfet?
  • Proper wiring
  • Proper volume from speaker
  • Missing screw
  • Add rotary detector
  • Rotary connector
  • Get microphone input working
  • Why is there so much distortion? oscilloscope time -> mic is broken
  • Hook up all buttons
  • who makes the bluetooth connection? -> chatgpt says that the HF should initiate the connection when powering up
  • Create timer framework
  • Add battery
  • prevent default echoing (if needed?)
  • Add battery indicator
  • Figure out interface (buttons, slammer, )
  • Add "Operator" sound
  • Add chatgpt integration? Talk to GPT-4o
  • debounce horn lift
  • fix the

Questions

Can we use the onboard ADC / DAC instead of I2S

How does I2S work?

The device emits a clock and a word-select channel (for left/right). Then an input and output pin are used to send/receive the data.

How can we schedule real time tasks like with xQueueReceive

https://www.freertos.org/Documentation/02-Kernel/04-API-references/11-Software-timers/01-xTimerCreate

xTimerCreate can be used.

Where do we actually get the bluetooth bits?

Automatically set by the proprietary bluetooth stack, when configured via PCM.

Alternatively we can use HCI and get/set it ourselves.

Is DMA used?

How can we quit the idf.py monitor stuff?

Ctrl ] or Ctrl x seems like it should work?

https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/tools/idf-monitor.html

Which commands should be used ideally?

We have 6 buttons

  • Red
  • Black
  • 4x white

And two more inputs:

  • Rotary dial
  • Horn slammer if current call: hang up if no call:

And then three indicators:

  • Flashing indicators
  • Buzzer

Brainstorm about cool demo

Pick up and get Google assistant right away?

It would be really cool if we could make it say "Operator" in a cool voice.

Can we have two calls simultaneously?

And if so, can we use the black and red buttons to switch between them? Also red / black could be assistant vs actual call?

The readme says the sound is currently echoed back. Is that true?

Yes, but only when the same GPIO for PCM input and output is used

What is "operator name"

ESP_HF_CLIENT_COPS_CURRENT_OPERATOR_EVT probably the mobile network operator name

Notes

GPIO25

Pin 25 is hooked up to a low-power configuration or something, so I had quite some trouble figuring out whether there was a short in the circuit or not.

Broken microphones?

Debugging th

PCM I2S parameters tweaking

This is currently not possible

Workaround for CVSD

The esp stack needed to be modified to disable high quality audio in the bluetooth negotiation. TODO add link