Hi Simon, Lucas just confirmed that it was working fine on Lyra T with ES8388 Audio Codec.
I think she is using SDCard over SPI (even slower). There is not SDCard interface support for ESP32 on NuttX yet (the SDCard uses/shares I2S interface). The ESP32 MCU has 2 I2S interfaces, so in theory one can be used for Audio and other for SDCard. The ESP32-S2 has only 1 I2S interface, so I don't know if it will work well. Hopefully ESP32-S3 has 2 I2S as ESP32. BR, Alan On 10/20/23, Simon Filgis <si...@ingenieurbuero-filgis.de> wrote: > Hi Simona, > > SD Cards have busy time times of 500ms max (per spec) for saving data > internally. I saw SD Cards taking over a second of busy time. > > You can check with the Oszilloskop. I think data0 is the pin that signalize > busy... > > Per design, you need a stream buffer that can handle your audio stream up > to 500ms... > > Regards, > > Simon > > -- > Ingenieurbüro-Filgis > USt-IdNr.: DE305343278 > -- > sent by mobile phone > > Alan C. Assis <acas...@gmail.com> schrieb am Do., 19. Okt. 2023, 23:36: > >> Hi Simona, >> >> On 10/19/23, Simona Toaca <simona.alexandra2...@gmail.com> wrote: >> > Hello, >> > I am trying to record audio using a MEMS microphone, but the final >> > recording is missing parts periodically (for example, with a sample >> > rate >> of >> > 8kHz, there are parts ~1s long missing once every ~10-11s. Using a >> > sample >> > rate of 48kHz, the period is ~1s long). This is my first time working >> with >> > I2S and I can't figure out what causes this behaviour. >> > >> > My setup is as follows: >> > - the microphone has 24-bit depth in a 32-bit word (MSB first) when >> > transmitting data >> > - i am using nxrecorder to record the pcm audio onto an SD card (device >> > pcm_in0) >> > - to listen to the recording i import the file into Audacity (24-bit, >> > Big >> > Endian) >> > >> > Defconfig regarding audio: >> > CONFIG_AUDIO=y >> > CONFIG_AUDIO_BUFFER_NUMBYTES=6144 (from the i2s buffer which is 8192 >> bytes, >> > 3/4 of it is "useful" info, 6144 bytes in total) >> > CONFIG_AUDIO_DMA=y >> > CONFIG_AUDIO_FORMAT_RAW=y >> > CONFIG_AUDIO_I2S=y >> > CONFIG_DMA=y >> > CONFIG_DMA_LINK=y >> > CONFIG_DRIVERS_AUDIO=y >> > CONFIG_ESP32_I2S0=y >> > CONFIG_ESP32_I2S0_BCLKPIN=25 >> > CONFIG_ESP32_I2S0_DATA_BIT_WIDTH_24BIT=y >> > CONFIG_ESP32_I2S0_DINPIN=26 >> > CONFIG_ESP32_I2S0_SAMPLE_RATE=8000 >> > CONFIG_ESP32_I2S0_WSPIN=27 >> > CONFIG_ESP32_I2S=y >> > CONFIG_I2S_DMADESC_NUM=4 >> > >> > I tried modifying the number of audio buffers and also making them >> bigger, >> > but that did not solve the problem. >> > Any ideas on what could cause this? >> > >> >> Could it be something related to SDCard storage? Maybe it needs some >> optimization! >> >> Please try using a RAMDISK of 1MB+ and save the file to it. >> >> If it works we will know the SDCard could be the limitation of this >> configuration. >> >> BR, >> >> Alan >> >
