MegARM

Module to in-place ATmega328P upgrade. GRBL WoodPecker board targeted particularly.

Based on 5V Cortex-M0+ 48MHz Microchip SAM C2x family.
Extras: 256kb flash, DIVAS (Divide and Square Root Accelerator)

TODO

• [X] Connectivity check
• [X] PCB Layout
• [X] rSamba bootloader
• [ ] GRBL Porting

Pinout

Atmega328p -> ATSAMC21E18A-MZ

        pin pin port
    #   AVR ARM #   
    D3  1   25  27  Ystp
    D4  2   27  28  Zstp
GND     3           
Vdd     4           
GND     5   28      
Vdd     6   30      
x1  B6  7   31  30  SWD
x2  B7  8   32  31  SDC

    D5  9   1   0   Xdir
    D6  10  2   1   Ydir
    D7  11  3   2   Zdir
    B0  12  4   3   EN
    B1  13  5   4   Xend
    B2  14  6   5   Yend
    B3  15  7   6   PWM     SPINDLE_PWM
    B4  16  8   7   Zend            

    B5  17  11  8   D13     SPINDLE_DIR

Avcc        18  9       Avcc
            10      GND
    A6  19  12  9   A6  
Aref        20          
GND     21          
            13  10  TP1
    A7  22  14  11  A7
    C0  23  15  14  A0      ctrl_reset
    C1  24  16  15  A1      ctrl_feed/door

    C2  25  17  16  A2      ctrl_cycle
    C3  26  18  17  A3      flood               
    C4  27  19  18  A4      mist                
    C5  28  20  19  A5      probe
RST C6  29  26          nRESET
            21  22  TP2
    D0  30  22  23  RX
    D1  31  23  24  TX
    D2  32  24  25  Xstp