Hi, my ESP32 board receives a Manchester encoded bitstream at a bit rate of 1 Mbit/s Every burst is 128 bytes long and the voltage levels are: 0 Volt - 3.3 Volt I'm focusing my attention on the I2S interface assisted by the DMA module. I would like to sample the Manchester burst on a GPIO input pin ...

Hi Kolban,

>> you can configure the ESP32 I2S subsystem to send or receive parallel data under hardware control
Thank you for your explanation.

Enrico Migliore

Hi, I would like to see an ARM core instead of a Cadence one. The ARM toolchain and the ARM software ecosystem are 100 times better then GNU Xtensa. Command line tools are like prehistoric animals. It takes hours to configure the GNU Xtensa toolchain to debug a program. It takes seconds with ARM. Ye...

Thank you for the link.

What is the parallel "I2S input interface"?

The I2S interface is meant for digital audio and it's supposed to be a serial interface.

Enrico Migliore

Hi,

I can't find the driver of the CSI Camera interface in the ESP32 IDF.

Does the ESP32 chip actually have a hardware CSI Camera interface?
The pins are: D0, D1, D2, D3, D4, D5, D6, D7, PXCLK, HREF, VSINCH

Thanks,
Enrico Migliore

Hi,

got it, thank you.

It's a simple JPEG decompressor that reads JPEG encoded streams and transforms them into RGB streams which can then be sent to TFT/LCD screens.

Thanks,
Enrico Migliore

Hi,

can anybody tell me how to use the libtjpegd library?

If I understood correctly that library should be located in the ROM of the ESP32 chip.

Thanks,
Enrico Migliore

Hi, if we enable the option "QIO" in the make menuconfig the ESP32 chip hangs and doesn't start. If we enable the option "DIO" in the make menuconfig the ESP32 chip starts and all works just fine. The VDD_SDIO pin is 3.3 Volts measured by an oscilloscope. The flash memory is the ISSI IS25LP128-JBLE ...

Thank you for the explanation.

Hi,

what does the internal ROM of the ESP32 chip actually contain?

A ROM size of 448 kBytes is really huge.

Usually, XiP (eXecution in Place) flashless microcontrollers have much smaller internal ROM sizes.

Thanks,
Enrico Migliore