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mrrwa / LocoNet

An embedded Loconet interface library for Arduino family microcontrollers
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__vector_11 Error with Servo.h Library #4

Closed pturvill closed 8 years ago

pturvill commented 8 years ago

The __vector_11 conflict between LocoNet.h and Servo.h has been discussed numerous times, but I have yet to find a solution. The marriage between these two libraries would seem to be a natural. Is there a solution anywhere In sight?

kiwi64ajs commented 8 years ago

Yeah that would be nice to be able to use the core Servo library but as the LocoNet decoding logic currently requires the use of the ICP peripheral, and that is only available on Timer1 AND the Server library ALSO uses Timer1 - that issues is not going to be resolved anytime soon.

I have been thinking of changing to code to use the UART and Pin Change interrupts to sense LocoNet Rx Activity but that is a while off and as the UART on the Mega328 is already used by the bootloader so it's not really viable. Perhaps for the 32u4 or other chips like the Teensy 3.x.

So for now you're stuck with the Software Servo libraries which probably don't perform as well.

You might want to consider driving the servos from an external PWM chips like these: http://www.ebay.com/itm/16-Channel-12-bit-PWM-Servo-Drive-shield-module-I2C-PCA9685-For-Arduino-NEW-/401090900127

HTH

Alex Shepherd

pturvill commented 8 years ago

Problem solved. A detailed Google search turned up the ServoTimer2 library by Michael Margolis (updated by Nick Bontrager) which as the name suggests, uses Timer2, and is compatible with the LocoNet library. It treats servo control a bit differently than the core Servo library, using pulse width rather than degrees to set the position, but with a tiny bit of tweaking it is now working perfectly on my homebrew Nano-based Quad_Servo_LocoNet_Driver sketch.

Thanks for the reply.

From: Alex Shepherd Sent: Sunday, June 5, 2016 11:53 PM To: mrrwa/LocoNet Cc: pturvill ; Author Subject: Re: [mrrwa/LocoNet] __vector_11 Error with Servo.h Library (#4)

Yeah that would be nice to be able to use the core Servo library but as the LocoNet decoding logic currently requires the use of the ICP peripheral, and that is only available onTimer1 AND the Server library ALSO uses Timer1 - that issues is not going to be resolved anytime soon.

I have been thinking of trying to changing to code to use the UART and Pin Change interrupts to sense LocoNet Rx Activity but that is a while off and as the UART on the Mega328 is already used by the bootloader it's not really viable. Perhaps for the 32u4 or other chips like the Teensy 3.x. SO for now you're stuck with the Software Servo libraries which probably don't perform as well.

You might want to consider driving the servos from an external PWM chips like these: http://www.ebay.com/itm/16-Channel-12-bit-PWM-Servo-Drive-shield-module-I2C-PCA9685-For-Arduino-NEW-/401090900127

HTH

Alex Shepherd

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

kiwi64ajs commented 8 years ago

Excellent!

That’s a good outcome. I’ll have to take a look at that library as I’ve had to avoid the core one as well…

Alex

On 8/06/2016, at 4:53 PM, pturvill notifications@github.com wrote:

Problem solved. A detailed Google search turned up the ServoTimer2 library by Michael Margolis (updated by Nick Bontrager) which as the name suggests, uses Timer2, and is compatible with the LocoNet library. It treats servo control a bit differently than the core Servo library, using pulse width rather than degrees to set the position, but with a tiny bit of tweaking it is now working perfectly on my homebrew Nano-based Quad_Servo_LocoNet_Driver sketch.

Thanks for the reply.

From: Alex Shepherd Sent: Sunday, June 5, 2016 11:53 PM To: mrrwa/LocoNet Cc: pturvill ; Author Subject: Re: [mrrwa/LocoNet] __vector_11 Error with Servo.h Library (#4)

Yeah that would be nice to be able to use the core Servo library but as the LocoNet decoding logic currently requires the use of the ICP peripheral, and that is only available onTimer1 AND the Server library ALSO uses Timer1 - that issues is not going to be resolved anytime soon.

I have been thinking of trying to changing to code to use the UART and Pin Change interrupts to sense LocoNet Rx Activity but that is a while off and as the UART on the Mega328 is already used by the bootloader it's not really viable. Perhaps for the 32u4 or other chips like the Teensy 3.x. SO for now you're stuck with the Software Servo libraries which probably don't perform as well.

You might want to consider driving the servos from an external PWM chips like these: http://www.ebay.com/itm/16-Channel-12-bit-PWM-Servo-Drive-shield-module-I2C-PCA9685-For-Arduino-NEW-/401090900127

HTH

Alex Shepherd

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread. — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub https://github.com/mrrwa/LocoNet/issues/4#issuecomment-224486781, or mute the thread https://github.com/notifications/unsubscribe/AHuO7TsXmbjerenOuK3NmRqUDiLYpjRzks5qJkrDgaJpZM4IucZt.