dgtpi

DGTPi I2C communication with DGT3000

Configure your pi:

Make sure the core frequency is locked. To do this you can add the following lines to /boot/config.txt:
$ core_freq=250
$ core_freq_min=250
you can increase these frequencies if needed for 4k resolution on the pi 4

Pin connections for DGT clock:

The I2C connection requires pull-up resistors (typically 4.7kΩ) on both SDA and SCL lines.

The DGT clock uses two I2C addresses:

• 0x08 - Main communication (commands to clock, responses from clock)
• 0x10 - Acknowledgment responses from clock

Raspberry Pi Model	Master I2C (Tx)	Slave I2C (Rx)	Notes
Pi 5	GPIO 2 (SDA), GPIO 3 (SCL) - I2C1 ALT0	GPIO 6 (SDA), GPIO 7 (SCL) - I2C3 ALT0	RP1 southbridge
Pi 4	GPIO 2 (SDA), GPIO 3 (SCL) - I2C1 ALT0	GPIO 10 (SDA), GPIO 11 (SCL) - I2C0 ALT3	Two BSC controllers
Pi 1/2/3	GPIO 2 (SDA), GPIO 3 (SCL) - I2C1 ALT0	GPIO 18 (SDA), GPIO 19 (SCL) - BSC SLAVE ALT3	Two BSC controllers

How to compile:

to compile use:
$ make

The library dgtpicom.so can be used as described in dgtpicom.h

The application dgtpicom can be used in three ways:

To display a message:

$ sudo ./dgtpicom "a message"
you can add a beep and icons/dots:
$ sudo ./dgtpicom "a message" 1 31 15

To run a clock:

$ sudo ./dgtpicom r 0 10 0 0 10 0
you can run Left and Right up and down with L,R,l and r

to turn off and exit on power button:

$ sudo ./dgtpicom
lever will pause, off button wil stop te app