How to flash the ESP-AT Firmware through USB D+ and D-?

ggeorge
Posts: 32
Joined: Mon Mar 07, 2022 6:00 am

How to flash the ESP-AT Firmware through USB D+ and D-?

Postby ggeorge » Fri May 13, 2022 10:14 am

Hello ESP32 Forum,

My name is Geoffrey K George and I am from Trimble Mobility Solutions. We have made a purchase for ESP32C3-Mini modules from your Indian Vendor RaByte.

We are facing an issue now with flashing the ESP-AT firmware. I am attaching the snippet of our schematic with the module in the attachments. We had done our schematic review with you and the review report is also attached as well. We tried flashing the ESP-AT using UART first, since we were not asked to take the CTS and RTS pin out to J11 Connector, we are not able flash now. As per your RaByte engineers CTS and RTS pins are required to flash the module firmware through UART.

Since Re-Spin is clearly not an option for us, is there anyway you can support us with the firmware flashing with just the pins in the J11 Connector. We tried using USB D+ and D- pins taken out in the J11 connector, it only shows USB not recognized, we tried swapping the USB D+ and D- pins as well. Still no luck. Kindly support us here as it is very urgent.
Attachments
SNM476M_Espressif review_21032022.pdf
ESP32C3-Mini on the target board schematic
(65.61 KiB) Downloaded 166 times
#2295_【Trimble Mobility】Hardware Review Report_202202330_EN.pdf
Espressif review report
(422.14 KiB) Downloaded 167 times

ESP_Sprite
Posts: 8884
Joined: Thu Nov 26, 2015 4:08 am

Re: How to flash the ESP-AT Firmware through USB D+ and D-?

Postby ESP_Sprite » Fri May 13, 2022 1:29 pm

Did you remove C136/C137? There aren't supposed to be any capacitors on USB data lines.

ggeorge
Posts: 32
Joined: Mon Mar 07, 2022 6:00 am

Re: How to flash the ESP-AT Firmware through USB D+ and D-?

Postby ggeorge » Mon May 16, 2022 1:58 pm

ESP_Sprite wrote:
Fri May 13, 2022 1:29 pm
Did you remove C136/C137? There aren't supposed to be any capacitors on USB data lines.
No we haven't tried that yet, will try and update.

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