Using the LTC2607 DAC

This folder contains the source files for controlling the LTC2607 2-channel 16-bit DAC via I2C bus, which is available e.g. on the Raspberry Pi minicomputer. The example is based on the REXLANG user-programmable function block of the REXYGEN System.

Channel A is controlled by an integer constant (try changing it on-the-fly), while a sine wave is generated at channel B (frequency and signal type can be adjusted on-the-fly as well).

Timing of the project

The algorithm runs each 200 milliseconds (0.2 s). See the EXEC function block,
tick x ntick0 = 0.1 x 2 = 0.2

Prerequisites

• REXYGEN Runtime Core must be installed and running on the target device (Raspberry Pi).
• I2C bus must be enabled and available (e.g. /dev/i2c-1).
• The wiring must comply with the attached datasheet.

Running the example

• The *exec.mdl file is the project main file.
• Open it with REXYGEN Studio.
• Specify the I2C bus by the p0 parameter of the REXLANG function block.
• Compile and download it to the target device.
• Switch to Watch mode and observe the algorithm.
• Observe voltage at DAC channel A and channel B.
• Change the CNI_channelA constant by hand as needed.
• Change the frequency and signal type in the SG signal generator as needed.

Documentation

• Press F1 for help on the selected function block in the REXYGEN Studio.
• Getting started with REXYGEN on the Raspberry Pi minicomputer
• Function blocks of REXYGEN
• REXYGEN Studio User Guide
• Complete documentation of REXYGEN
• LTC2607 datasheet (attached)

Additional information

• Raspberry Pi is a trademark of the Raspberry Pi Foundation.
• Visit the REXYGEN webpage for more information about the example projects and developing advanced automation and control solutions using REXYGEN.