[gnea/grbl-Mega Issue#47] laser connected to digital pin 10 About GRBL HAL

Issue #47 | 状态: 已关闭 | 作者: renebohne | 创建时间: 2017-11-26

Hi,

first, thanks for this awesome project!
I am trying to use it with the Makeblock Laserbot and their MegaPi board.
I mapped all the pins, but my last problem is the laser pin. The MegaPi uses digital Pin 10 (PB4/OC2A).
This means, that I need to use timer2 for PWM on this pin and this is an 8-bit timer… the current implementation uses 16bit-timers.

Can somebody help me with using PB4 for the laser?
This is my current code in cpu_map.h
// Advanced Configuration Below You should not need to touch these variables // Set Timer up to use TIMER2A which is attached to Digital Pin 10 - PB4 // warning: Timer2 is an 8-bit timer! #define SPINDLEPWMMAX_VALUE 255.0 // Translates to about 1.9 kHz PWM frequency at 1/8 prescaler #ifndef SPINDLEPWMMIN_VALUE #define SPINDLEPWMMIN_VALUE 1 // Must be greater than zero. #endif #define SPINDLEPWMOFF_VALUE 0 #define SPINDLEPWMRANGE (SPINDLEPWMMAXVALUE-SPINDLEPWMMINVALUE)


//rb MegaPi THIS HAS TO BE CHANGED TO A DIFFERENT PIN! OC2A is for D10 (PB4)

//Control Digital Pin 6 which is Servo 2 signal pin on Ramps 1.4 board

//#define SPINDLETCCRAREGISTER    TCCR4A

//#define SPINDLETCCRBREGISTER    TCCR4B

//#define SPINDLEOCRREGISTER      OCR4C

//#define SPINDLECOMBBIT          COM4C1

#define SPINDLETCCRAREGISTER    TCCR2A

#define SPINDLETCCRBREGISTER    TCCR2B

#define SPINDLEOCRREGISTER      OCR2A

#define SPINDLECOMBBIT          COM2A0
// 1/8 Prescaler, Fast PWM mode

#define SPINDLETCCRAINIT_MASK ((1<TCCRBINIT_MASK ((1<OCRAREGISTER   OCR2A // Fast PWM mode requires top reset value stored here.

#define SPINDLEOCRATOPVALUE  0xFF // PWM counter reset value. Should be the same as PWMMAX_VALUE in hex.
// Define spindle output pins.

#define SPINDLEPWMDDR   DDRB

#define SPINDLEPWMPORT  PORTB

#define SPINDLEPWMBIT   4 // MEGA2560 Digital Pin 10 - 12v output MegaPi
// Define flood and mist coolant enable output pins.

#define SPINDLEENABLEDDR   DDRF

#define SPINDLEENABLEPORT  PORTF

#define SPINDLEENABLEBIT   0 // MEGA2560 Analog Pin 0 - 12v output

#define SPINDLEDIRECTIONDDR    DDRG

#define SPINDLEDIRECTIONPORT   PORTG

#define SPINDLEDIRECTIONBIT    2// MEGA2560 Digital Pin 39 - MegaPi P15 5x2 pin1

// Define flood and mist coolant enable output pins. #define COOLANTFLOODDDR DDRA #define COOLANTFLOODPORT PORTA #define COOLANTFLOODBIT 2 // MEGA2560 Digital Pin 24 #define COOLANTMISTDDR DDRA #define COOLANTMISTPORT PORTA #define COOLANTMISTBIT 0 // MEGA2560 Digital Pin 22

#1 – renebohne 于 2017-12-12

I fixed it. The MegaPi has a super slow mosfet, so I had to decrease the PWM frequency. If somebody is interested, you can have a look at https://github.com/renebohne/grbl-laserbot
I close the issue in this repo, since this was a very special feature request.

#2 – Fusseldieb 于 2020-08-18

@renebohne Since you’ve already did things with PORTs and stuff, can you help me real quick on how my definitions should look. I’m setting up a Laser and am absolutely clueless on how to make the pin D11 work on the Mega2560

https://github.com/fra589/grbl-Mega-5X/issues/138

#3 – renebohne 于 2020-08-19

> @renebohne Since you’ve already did things with PORTs and stuff, can you help me real quick on how my definitions should look. I’m setting up a Laser and am absolutely clueless on how to make the pin D11 work on the Mega2560
>
> fra589#138

You can search for “//rb THIS CHANGED TO A DIFFERENT PIN! OC2A is for D10 (PB4) – using 8-bit timer Timer2”
in file https://github.com/renebohne/grbl-laserbot/blob/master/Arduino/cpu_map.h
And have a general look into my changes in that fork…
but my recommendation is not to waste time on this and use official hardware instead.

原始Issue: https://github.com/gnea/grbl-Mega/issues/47

[gnea/grbl-Mega Issue#47] laser connected to digital pin 10

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