ESP8266 Community Forum

- Sun May 29, 2016 9:03 am #48209 Change the state of the port is a very, very long.

Code: Select allfor i=1 to 100
ow 2 0
ow 2 1
next i


Time change is more than 2ms, why so long?
I need to generate a GPIO course of 50us, and it is not feasible.

01000001001110101000001000110111110001001
Every bit is to have 50us. How to do it?
ESP is set, max speed 160MHz

- Sun May 29, 2016 9:34 am #48211 ESP Basic is an interpreter. Bit banging is not going to be that easy.

There are special functions for SPI and i2c if you need a higher speed interface.

Serial terminal in the chrome browser see https://serialTerminal.com

http://esp8266basic.com
A BASIC interpreter for your ESP

Working now on Autodrop3d. A 3d printer with automatic part ejection system. https://autodrop3d.com

- Sun May 29, 2016 9:43 am #48212 I2C is a good idea, thanks

- Sun May 29, 2016 4:56 pm #48235 In your case you should use SPI.
If I converted correctly your binary code 01000001001110101000001000110111110001001 corresponds to '8275046F89' in hex. In order to have a bit @ 50us the frequency must be 20 KHz.
You can so use the following functions :
spi.setup(20000)
spi.hex("8275046F89", 5)

The output pin is the MOSI: GPIO13