Is it possible for the ESP32 to work as a combined I2C master and slave? I am working on a project with multiple masters, and it would be nice if each master could push packets to each other, rather than one acting as a slave and polling the other. I was originally hoping the two I2C controllers on ...

Now that there's support for an external 32.768kHz crystal in the IDF, have the start-up issues been resolved? I've noticed my board will say "still waiting for 32k oscillator to start up," and eventually it will either boot or hang. However, using the above code snippet, I do see a 32kHz square wav...

I've attached a simplified schematic. What I'm hoping to use: 1. SD card 2. SPI bus for LCD 3. Internal stereo DAC 4. Internal ADC 5. I2C 6. 32.768kHz crystal 7. At least two touch pads I have fairly limited options for pin assignments. GPIO2 is used by the SD card. GPIO0 is tri-stated by the USB co...

Does the ESP32 hardware allow the I2S module to use the internal DAC and ADC simultaneously (i.e., streaming full-duplex audio)? Obviously the software support in esp-idf isn't there yet, but I'm curious if it will be possible in the future.

In the latest rev of my board I moved the SD card connections from the confusingly-named SD_* pins to the JTAG pins (MTMS, MTDI, MTCK, MTDO, GPIO2, GPIO4). Unfortunately, I've been tearing my hair out for the past few days trying to figure out why the bootloader doesn't see the flash of the ESP-WROO...

I need to do a bit more investigating, but it seems like using the internal DAC mode only outputs mono audio. I have a separate project which synthesizes audio samples, and if I only send audio to the left channel, I hear silence, and if I only send audio to the right channel, I hear both channels. ...

Did you remember to define DAC_BUG_WORKAROUND in playerconfig.h? I believe you get those underrun errors if you don't.

Pull request submitted. init_i2s_dac() sets the I2S peripheral configuration to use I2S_BITS_PER_SAMPLE_8BIT, but the renderer config isn't updated to reflect this, so it prepares 16-bit samples.

It turns out there are two issues: 1. The built-in DAC expects unsigned samples, while the conversion to 8 bit samples (convert_16bit_stereo_to_8bit_stereo in audio_renderer.c) converts to signed samples. 2. The renderer config is always set to I2S_BITS_PER_SAMPLE_16BIT, even when using the DAC_BUIL...

Has anyone obtained decent quality using the built-in DAC in I2S mode? I tried modifying this demo and I do get audio out, but it's extremely distorted. Looking at the DAC_1 and DAC_2 lines on my scope, they look like square waves and not analog signals. It doesn't look like a PDM signal either. Is ...