example of i2c words - Githubissues

zeroflag / punyforth

Forth inspired programming language for the ESP8266

Other

406 stars 43 forks source link

example of i2c words #30

Closed enriquepinedo closed 6 years ago

enriquepinedo commented 6 years ago

Hi Atila !

I am having troubles finding an example of i2c use, I am triying a PCF8574 lcd and saw yours i2c-write-slave i2c-read-slave i2c-write i2c-read i2c-init i2c-stop i2c-start

my questions are how to adress the chip , stack notation for each word, etc.

is it Ok to use D1 SCL and D2 SDA, must those Pins be defined beforehand to the ESP8266 or are they fixeded pins ? lots of doubts....

Can you help me ?

Best regards, Enrique.

zeroflag commented 6 years ago

Here is an example that sends a 8 byte buffer to a slave with 3C address.

5 ( D1 ) constant: SCL
4 ( D2 ) constant: SDA
8 buffer: data
\ .. fill data ..
SDA SCL i2c-init
8 data 16r3C i2c-write-slave

zeroflag commented 6 years ago

Also I started working on ssd1306 i2c display driver that can serve as an example.

This one is already usable but few things might change in the future.

https://github.com/zeroflag/punyforth/blob/master/arch/esp8266/forth/ssd1306-64x48-i2c.forth

enriquepinedo commented 6 years ago

Excellent Atila !

I will look at it and experiment on that, I keep you posted. thanks again for bewying helpful and good work ! Enrique