How to enter boot mode on Moddable Six Display

[stc1988]

When I try to flash the application, I get the following error.

Please wait - probing for device
/dev/cu.usbserial-0001 failed to connect: Failed to connect to Espressif device: No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html

A fatal error occurred: Could not connect to an Espressif device on any of the 1 available serial ports.
Failed to find a suitable device. Check your connections or set UPLOAD_PORT
Usage: idf.py 921600 [OPTIONS]
Try 'idf.py 921600 --help' for help.

Error: No such option: -n
make: *** [all] Error 2

The device appears to be recognized as shown below, and since it works fine with another ModdableSix, I believe it is not a cable issue.

 ls /dev/cu*
/dev/cu.Bluetooth-Incoming-Port /dev/cu.debug-console           /dev/cu.usbserial-0001

I’ve tried connecting while holding down the FLASH button, but it doesn’t work. Is there a way to check if it has entered BOOT mode?

[phoddie]

Nothing special is required. The micro-USB connector is a Moddable Programmer that supports the auto-programming circuitry for the ESP32. We successfully tested that here today with two different computers using two different Moddable Display 6 units.

Have you tried connecting to a serial monitor to confirm that the initial boot message is received from the device? ESP32 boot messages are at 115200 baud, 8N1. You can use serial2xsbug as a primitive monitor:

serial2xsbug /dev/cu.usbserial-0001 115200 8N1 -trace

Here that displays the following when pressing the reset button:

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x9 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce2820,len:0x1f8
load:0x403c8700,len:0xbc0
load:0x403cb700,len:0x2910
entry 0x403c8858

That's followed by some garbage as the devices switches to a higher baud rate for xsbug communication.

[stc1988]

Have you tried connecting to a serial monitor to confirm that the initial boot message is received from the device? ESP32 boot messages are at 115200 baud, 8N1. You can use serial2xsbug as a primitive monitor:

I tried serial2xsbug, but nothing was displayed.　By the way, the LED on the Moddable Programmer is lit.