Search found 317 matches

by loboris
Thu Nov 15, 2018 9:20 am
Forum: General Discussion and Questions
Topic: New cheap OLED screen
Replies: 9
Views: 856

Re: New cheap OLED screen

Chinese sellers often writes nonsense descriptions "IPS HD TFT ... LCD OLED Display" intentionally, to be found by search engines...
by loboris
Mon Nov 12, 2018 11:20 am
Forum: ESP32 boards
Topic: Difference between SRAM & SPIRAM
Replies: 13
Views: 1485

Re: Difference between SRAM & SPIRAM

For all practical usage (especially in an environment such as MicroPython) there is almost no difference between using internal RAM and external SPI-RAM. Main reason for that is the fact that the ESP32 code is executed from Flash which is an external, SPI connected, device. Flash read operations are...
by loboris
Sun Nov 11, 2018 7:34 pm
Forum: ESP32 boards
Topic: Difference between SRAM & SPIRAM
Replies: 13
Views: 1485

Re: Difference between SRAM & SPIRAM

SPIRAM is much slower. Waayyyyyyyy slower. It is slower, but... Theoretical SPI-RAM access speed is ~40MB/s. In final application, for example in MicroPython firmware, SPI-RAM access speed is is ~14 MB/sec. The access is cached in internal RAM buffer (same as Flash access) and practical results sho...
by loboris
Sun Nov 11, 2018 5:10 pm
Forum: ESP32 boards
Topic: Difference between SRAM & SPIRAM
Replies: 13
Views: 1485

Re: Difference between SRAM & SPIRAM

ESP-IDF Programming Guide : The ESP32 has a few hundred KiB of internal RAM, residing on the same die as the rest of the ESP32. For some purposes, this is insufficient, and therefore the ESP32 incorporates the ability to also use up to 4MiB of external SPI RAM memory as memory. The external memory ...
by loboris
Sat Nov 10, 2018 8:43 am
Forum: ESP32 boards
Topic: ESP32-CAM 101
Replies: 5
Views: 3189

Re: ESP32-CAM 101

I connected UART wires to ESP32-CAM with following pins Red: VCC Green: U0T White : U0R Black: GND But I don't see ESP32-CAM getting detected on mac. What is required here ? If you are using the USBtoSERIAL cable like this one , green is TxD and has to be connected to U0R , white is RxD and must be...
by loboris
Wed Nov 07, 2018 4:16 pm
Forum: General Discussion and Questions
Topic: ffi module Micropython ESP32
Replies: 4
Views: 522

Re: ffi module Micropython ESP32

I'm finishing the usqlite3 module implementation for my MicroPython port, based on this library.
It works great, I expect to commit it next week.
by loboris
Wed Nov 07, 2018 9:39 am
Forum: General Discussion and Questions
Topic: How to communicate with 40 bit SPI
Replies: 4
Views: 315

Re: How to communicate with 40 bit SPI

Pack your regaddr and data to one 5-byte bytearray and send it in one SPI transaction.
by loboris
Tue Nov 06, 2018 7:52 pm
Forum: ESP32 boards
Topic: ESP32-CAM 101
Replies: 5
Views: 3189

Re: ESP32-CAM 101

See the ESP32-CAM Product Specification.pdf and schematic . You must use some USB to UART adapter connected to GND , U0R & U0T pins. Use IO0 and RST button to enter the download mode and flash the MicroPython firmware. Some usefull info can be found in ESP32_CAMERA_QR GitHub repository. I'm planning...
by loboris
Tue Nov 06, 2018 10:02 am
Forum: General Discussion and Questions
Topic: How to communicate with 40 bit SPI
Replies: 4
Views: 315

Re: How to communicate with 40 bit SPI

Just sent 5 bytes (= 40 bits).
by loboris
Sat Nov 03, 2018 11:23 pm
Forum: ESP32 boards
Topic: Remove MicroPython and restore original firmware
Replies: 3
Views: 701

Re: Remove MicroPython and restore original firmware

For such generic ESP32 questions I would recommend cunsulting the ESP32 documentation and the official Espressif forum.
You will find all the answers there.