mic input device not find

RE: mic input device not find

Eamon.Yan — Tue, 19 Nov 2019 01:55:48 GMT

My CONFIG_BLE_GATT_MAX_MTU_SIZE has been set to 247, which should not happen as you said

RE: mic input device not find

Øyvind — Mon, 18 Nov 2019 12:56:13 GMT

CONFIG_IO_PDM_CLK and CONFIG_IO_PDM_DATA can be configured to match your HW. In Ubuntu

CONFIG_AUDIO_HID_ENABLED should be set to 1. Both

CONFIG_AUDIO_HID_ENABLED and CONFIG_AUDIO_ATVV_HID_ENABLED can be configured to 1, but ATVV (Android TV Voice Service) needs an ADPCM audio codec configured to 8kHz and samples size of 256 bytes.

If you choose Opus as an audio codec you can choose a variable or a set bit length. A variable bit length will cause a variable audio packet size. Also, the SR3 will fragment the audio packet with a size > MTU.

E.g. Opus with 40kbit/s data rate and 20ms frame length will produce a 102-byte audio packet every 20 ms (2-byte header added by us). If the MTU is 23, this 102-byte packet will be fragmented and sent as 5 x 20 byte + 1 x 2 byte.

RE: mic input device not find

Eamon.Yan — Thu, 14 Nov 2019 01:24:42 GMT

Is it necessary to use p24 and p25? I use clk26,data25. Is that a problem?Buttons I have no use, my way is the Enable via bluetooth enabled audio data, but not the length of the audio data, a start to open the length of 38, transmission becomes 5 after dozens of length, the don't know why, I've tested, he the length of the data when I codec is set apcm has always been 131, but this state ubuntu can't identify the device.

RE: mic input device not find

Øyvind — Wed, 13 Nov 2019 13:47:43 GMT

Ok, then you will need to configure your hardware accordingly. Attached are two files that you need to save in the following folder:

nRF5x SDK-SR3\examples\ble_peripheral\smart_remote_3_nrf52\Source\Configuration
devzone.nordicsemi.com/.../sr3_5F00_config_5F00_nrf52832_5F00_custom.h devzone.nordicsemi.com/.../sr3_5F00_config_5F00_nrf52832_5F00_custom.diff

PDM is configured to P0.24 and P0.25 and has been tested with working audio in Ubuntu. Note that only audio and LED are enabled in the config. Buttons are not enabled due to different HW-setup with SR3 buttons.

RE: mic input device not find

Eamon.Yan — Wed, 13 Nov 2019 10:06:48 GMT

I'm using other hardware

RE: mic input device not find

Øyvind — Wed, 13 Nov 2019 10:02:48 GMT

Are you using the Smart Remote 3 reference design HW or other HW?

RE: mic input device not find

Eamon.Yan — Wed, 13 Nov 2019 06:19:10 GMT

When I amend the CONFIG_AUDIO_CODEC value to 3, I can find the microphone input devices on ubuntu, but the transmission of data length is wrong, I now the equipment only connect a mic, I CONFIG_PDM_MIC is 2, must meet two mic. The following figure is my pick in the ubuntu information displayed on the device and a serial port of the log, trouble to help analyze.

RE: mic input device not find

Øyvind — Mon, 11 Nov 2019 09:34:04 GMT

For Windows, this is correct, as BLE Audio Profile is not supported in Windows on Smart Remote 3 (SM3). This information may not be clear with the quick-start guide. Only touchpad, buttons, and gyro work in Windows. Have you configured the SM3 audio for Ubuntu? Does the SM3 show in Ubuntu at all?

The Quick-Start guide states:
The Product example comes with pre-installed firmware. For a quick start with this device, just insert batteries, and continue reading in Pairing with Windows (basic use) or Pairing with Ubuntu (use with audio).

Let me know how that works.