AD7606p16_t4 library v0.0.1

[jlaustill]

AD7606p16_t4: Ultra-High-Speed 16-bit Parallel ADC Library


200K+ conversions/sec while main loop still runs 11M+ cycles/sec


I built this library for 8-channel, 16-bit ADC applications using the AD7606. What makes it special: direct GPIO port manipulation for blazing performance that barely touches your CPU!


GitHub: https://github.com/jlaustill/AD7606p16_t4

Performance vs Traditional Approaches:​

• digitalRead() approach: Lockups at low rates, 100% CPU usage
• This library: 200K conversions/sec, <5% CPU usage
• Result: 95%+ CPU free for your main application

Technical Details:​

• Teensy 4.1: Single GPIO port read (1 operation) for all 16 bits
• MicroMod: 3 GPIO port reads + bit extraction
• Auto-detects board type for optimal performance
• Interrupt-driven with minimal ISR overhead
• Uses optimized GPIO6/7/8 port registers instead of individual pin reads

Important: Fixed Pin Assignment​

Due to GPIO port optimization, data pins are hardcoded for maximum speed:

• Teensy 4.1: Uses GPIO6[16:31] for single-operation reads
• MicroMod: Uses GPIO8[12:17] + GPIO7[4:12,16] for 3-operation reads
• Control pins (RD, CS, CONVST, BUSY, RESET) are configurable
• Designed to avoid conflicts with CAN, I2C, and SPI

Perfect for:​

• High-speed data acquisition
• Power monitoring systems
• Multi-channel instrumentation
• Real-time control systems

Pin Mapping Resource:​

I mapped all the GPIO ports for both platforms here: https://docs.google.com/spreadsheets/d/1BC1eYR55txT5fmuboq2l4_cap3tO48nNU4KF2Cu07pk/edit?usp=sharing


That exercise was quite annoying, as the ATP carrier board documentation is a hot mess, so this spreadsheet will be my go-to resource from now on. I may even turn it into a web page or PDF in the future.


If anyone else needs high-performance parallel ADC on Teensy, this should save you a lot of development time!

 

[joepasquariello]

Nice. Is this 200Ksps x 8 channels?

 

[jlaustill]

Nice. Is this 200Ksps x 8 channels?

Yes it is! I wrote this library to always read all 8, and you just use the ones you need. I'll add a counter to the example so people can see for themselves, thanks for the idea.

 

[joepasquariello]

Is there an off-the-shelf dev board for the ADC that you recommend for use with T4.1? I don’t have a need for 200ksps, but it would be fun to play with.