tardisgallifrey / mcp4725 Goto Github PK

README.md

MCP4725 DAC project in C, C++, C#

This is part of a project I'm working on with a rasberry pi to learn how to utilized and program an MCP4725 12-bit DAC.

I give original credit to Lewis Loflin as he, once again, was able to figure out the registers and write an initial C program.

As opposed to an ADC, this one is much simpler. You simply load your registers and send them out. The current C program runs a loop to increase the output of the DAC from 0 to 4096 (12-bits).

It is interesting to note that in the program, in order for the 12 bits loaded in a 16 bit integer, one must shift it right and then left in order to get the 8-bit MSB and LSB registers to share the number. (or, is that shift left and then right?).

The program works as written. Check there for details.

I am also currently working on porting this same routine to other languages. C# (.NET) will show up soon, followed by C++, and maybe Go, in the future.

The existing C coded program works two ways:

If you don't supply a value between 0 - 4096, it runs a test loop from 0 - 4096 with a test output of values sent to the registers.

If you supply a command line argument, it sets the MCP4725 to that level.

Example: MCP4725set 2048

The actual voltage output is determined by VCC of the board.
For the raspberry pi, that is 3.3VDC. I'll have to work on something to make it do an industry standard of 0-5VDC or 0-10VDC.