JTAG can be used to both program and debug: https://www.esp32.com/viewtopic.php?t=7956 If JTAG serves both features do I need to include USB connector and USB to UART Bridge? Well that is up to you. JTAG is relatively expensive and not exactly consumer gear. (1) you could use another style of connec...

Although since FreeRTOS uses a lot of critical sections I might miss the interrupt Only if you configure the interrupt as being level. Try edge. There are a few critical sections but not such that you would notice. Actually that is possibly a lie. I have seen the I2C output clock stretch for >1.2mS...

Thats more like it! I would suggest that you start with a spreadsheet with all the ESP pins. Next allocate hardware interfaces to those pins. Check that can map the interface to the pin. Some functions are native to certain pins. If you use the GPIO mux then that slows you down. Does your example us...

You did not post a link to your source material including code base! List all the hardware interfaces you have; display, usb, wifi, ble etc. Be careful though, you must break features (Display) down into acceptable interfaces. How do you achieve 'Display'? (SPI would be one way but there are others)...

Which I2C device are you using? As I understand you; (1) At initialisation you want to read the I2C device's timestamp in a low latency/no interrupts way such that you know I2C time and ESP 'world' time. (2) The I2C device stores readings in an internal FIFO. When the FIFO is full you fetch all the ...

Wifi, Do you have the commit details? I should check that all issues have been addressed. There were at least 2 errors. (1) The driver would lock failed after overflow, reboot being the only recovery. Try switching interrupts off for 100mS and you will see. (2) Corrupt data getting through. I could ...

How do you know that the baud rate changes? Have you measured the bit rates? A long time ago I was a little out in my UART clock and this, from time to time, allowed other effects to corrupt (being marginal already). Thing was my configuration was wrong! On the ESP32 I have seen weird I2C (not I2S) ...

I have a project which has a complex analogue I2C slave device. I want to automate tests & build in some determinism. The device is a set of I2C registers. Some registers hold the analogue value, others are used to configure. We use a hard coded configuration so it is enough just to check that confi...

Keep in mind that DMA can be counter productive for small transfers. One of my SPI channels is a cheap MPC2515 and that is a very chatty device with between 3 and 8 byte transfers. Latency & setup really kill that through put. On the short transfers I measured that no DMA was faster. Basically the S...

Qualcomm and NXP seem to offer solutions (but still below Espressif in terms in functionality and cost) Exactly, 'you pays your money....' So (basically) finding a silicon sweet spot is very tricky! Also very tricky for anyone else to review that trade without knowing your ram/flash etc requirement...