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michaelkamprath / ShiftRegisterLEDMatrixLib

A library for Arduino that can control LED matrices which use shift registers to manage rows and columns.
GNU Lesser General Public License v3.0
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[error: 'TCNT2' was not declared in this scope] When using a pro micro #18

Closed hesa2020 closed 3 years ago

hesa2020 commented 3 years ago

Hello I tried to use this library with my pro micro Leonardo-ish? (ATmega32U4) however I am getting errors the followings are not declared in scope: TCNT2 TIMSK2 TOIE2 CS22 CS21 CS20 OCIE2A ASSR AS2 TCCR2B WGM22 TCCR2A WGM21 WGM20

I would really appreciate if you can apply a quick fix for this controller. I purchased your kit thinking it would work nicely with a pro micro.

michaelkamprath commented 3 years ago

The ATmega32U4 is an older chip and doesn't have some of the support that more modern AVR Microcontrollers have. Specifically, it doesn't have the interrupt timer 2 that the code you are trying to use depends on for AVR MCUs, and generally has a different timer structure. My suggestion is that you use a more current MCU. The ATmega1284P is a good one to try.

If I were to update the code here it would be to generate a compiler error when the ATmega32U4 is being used.

michaelkamprath commented 3 years ago

I see that SparkFun has created some new(ish) products using this ATmega32U4 chip. I'll see what I can do but absolutely no promises on timeline or outcome. The ATmega32U4 has a different timer set up than the ATmega328P (which the UNO is based on). This is an open source project, and pull requests are welcome.

I'd strongly suggest upgrading you MCU, however. This library requires a good foot print of RAM due to its double-buffer technique and the 2.5K that the ATmega32U4 has will only be sufficient for smaller matrices or single-color matrices. If you want to stick to AVR, the ATmega1284P works well. I'd recommend the Teensy 3.x or 4.x.

hesa2020 commented 3 years ago

@michaelkamprath Thanks I went and bought a Teensy 3.6 at a local store!

michaelkamprath commented 3 years ago

@hesa2020 Did the Teensy work for you?

hesa2020 commented 3 years ago

I unfortunately never been able to get this working properly, im not entirely sure what im doing wrong

michaelkamprath commented 3 years ago

But did you try with the Teensy? Also, how did you wire up the Teensy? Note that the Teensy has 3.3V output, and you will need to level shift the output to 5V. I discuss that here

michaelkamprath commented 3 years ago

closing due to the lack of activity. reopen if new questions emerge.