The bits are roughly 10 us wide (between edges) The ISR takes 4 us to run. There is a 2 us delay from the time the edge changes until the ISR is running. So typically the ISR is done at 6 us.

I have checks in the ISR for it being executed a second time while the first instance is still running. I ...

I'm connecting an ESP32 to an instrument via a 5V non standard synchronous serial protocol. Like SPI but not quite SPI.
When I decode the serial data on my oscilloscope, every message is perfect, all the data is good. There are no bad messages.

I've written 3 different ESP32 routines to decode ...

Update: ESP32-S3-WROOM-1 and -2 have exactly the same SPI wording in their respective datasheets. No mention is made of V2 having extra capabilities over V1.

https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-2_datasheet_en.pdf
https://www.espressif.com/sites/default/files ...

This table (https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/protocols/esp_spi_slave_protocol.html) says that an ESP32-S3 v2 will do the SPI Slave Half Duplex protocol. Does that mean that v1 will not ?

How does one tell if a processor is v1 or v2 ?

When did the changeover ...

It turns out that the problem is the ESP32 WROOM board I am using don't support JTAG debugging via the USB interface. It only supports the uploading of code. The key piece of information in this regard is that the USB interface on my board is Silicon Labs CP210x UART Bridge . The usual USB device ...

You need to connect a debug probe to the jtag pins, see https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/jtag-debugging/configure-ft2232h-jtag.html


So there is no way to debug an ESP32-WROOM* without using a separate JTAG device ? The on board USB interface allows for ...

What do you mean by the "in the "blink-led" location instead of main" ? Are you not running this command in a terminal window in VSCode ?

The eFuses have never been touched on this processor and I've been able to flash it with other IDE/toolchains.

What isn't working ?

See attached output of ESP-IDF Doctor.

Do you want the log file or just the first part ?