DriverIntegrationIntoNopMicroPython < AFNOG

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---+ Integrating the camera driver into !MicroPython.
---++ Programming the esp32-cam processor

The esp32-cam does not come with a serial USB interface as many other ESP32 processor boards do. This makes programming the device quite a bit more tricky.

<img alt="esp32-cam.png" src="%ATTACHURL%/esp32-cam.png" title="esp32-cam.png" />

Having a look at the pin-out we see that GPIO 1 and 3 are connected to !UoTXD and !U0RXD respectively.

<img alt="esp32-cam-Pinout.png" src="%ATTACHURL%/esp32-cam-Pinout.png" title="esp32-cam-Pinout.png" />

These will be the programming pins connected to USB to serial converter.

<img alt="usbToSerial.png" height="292" src="%ATTACHURL%/usbToSerial.png" title="usbToSerial.png" width="495" />

Here are the connections:

| ESP32-cam | |
| Power 5V left side of esp32-cam | external power supply 5V |
| GND left side of esp32-cam | external power supply GND |
| GND top right of esp32-cam | USB to serial GND |
| !U0TXD | USB to serial RX |
| !U0RXD | USB to serial TX |
| GPIO 0 | connect to GND when flashing |
| GND | |
In order to understand how to program the device the circuit diagram will be very helpful.

%ATTACHURL%/ESP32_CAM_V1.6.pdf

To flash a new program into the esp32 flash we must first connect GPIO 0 to ground, which can be done with a simple jumper. Then we can erase the flash with:

_esptool erase_flash_

I give the command with power on the esp32-cam off and switch power on as soon as esptool tries to connect to the esp32

Finally we can flash the program:

esptool write_flash --flash_size=detect --flash_mode dio 0x1000 binaryToBeFlashed

Again I give the command with power to the esp32 off and switch power on as soon as esptool tries to connect to the esp32.

This procedure will allow to flash our [[custom !MicropPython]] with the camera driver installed.

-- %USERSIG{UliRaich - 2020-01-25}%

---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
pdf	ESP32_CAM_V1.6.pdf	r1	manage	26.2 K	2020-01-25 - 10:58	UliRaich
png	esp32-cam-Pinout.png	r1	manage	171.8 K	2020-01-25 - 10:37	UliRaich
png	esp32-cam.png	r1	manage	224.1 K	2020-01-25 - 10:37	UliRaich
png	esp32-camSchema.png	r1	manage	170.0 K	2020-01-25 - 11:06	UliRaich
png	usbToSerial.png	r1	manage	100.9 K	2020-01-25 - 12:39	UliRaich

Topic revision: r2 - 2020-01-25 - UliRaich