Waveshare 4.2 with Arduino Mega

Other Hardware Displays
1

I just purchased a Waveshare 4.2" e-paper display with the hopes of using it with an Arduino Mega. I hooked it up to the Uno first and it works, although i have a lot to learn. Then I hooked it up to the same pins on a Mega clone and while the code uploads, it doesn't run. Has anyone already figured out how to run this display with a Mega? I am creating a control panel display for a hops dryer with multiple temperature, humidity and fan variables and I think this will be much nicer than using 4-line lcd displays. This is the one I bought. https://www.waveshare.com/product/displays/e-paper/4.2inch-e-paper-module.htm

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I figured it out. First, you have to change the wiring a bit because the SPI pins are different on the Mega.

UNO
MOSI = D11
SCK = D13
SS = D10

MEGA
MOSI = 51
SCK = 52
SS = 53

Next, edit epdif.h to change the CS_PIN assignment. I modified mine to have both UNO and MEGA sections. It appears that MISO isn't used.

// UNO Pin definition
/*
#define RST_PIN         8
#define DC_PIN          9
#define CS_PIN          10
#define BUSY_PIN        7 
 */

// MEGA Pin definition
#define RST_PIN         8
#define DC_PIN          9
#define CS_PIN          53
#define BUSY_PIN        7
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