# Pin Mapping

**NOTE!** This table is only applicable when using the M2 board as selected from the Tools -> Board menu from the Arduino IDE. See more information [here.](https://github.com/macchina/arduino-boards-sam)

**Use the names in the "Mapped Pin Name" column in your Arduino Sketch.**

A "pin mapping" describes how the different circuits of your M2 are connected to the processor. For example, the Green LED (DS6 on the schematic) is connected to pin 7 (AKA PA14) of the processor. To make things easier from a programming standpoint, we can map this to a pin name, in this case, the green LED is mapped to the name `DS6` (which is compiled to the value 18).

## LEDs

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes        | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------------ | -------------- | --------------------------- | --------------------------- |
| DS2                                        | DS2 (RED)            | LED ON = LOW | PD10           | 32                          | 14                          |
| DS3                                        | DS3 (YELLOW)         | LED ON = LOW | PA5            | 25                          | 15                          |
| DS4                                        | DS4 (YELLOW)         | LED ON = LOW | PD2            | 15                          | 16                          |
| DS5                                        | DS5 (YELLOW)         | LED ON = LOW | PA15           | 8                           | 17                          |
| DS6                                        | DS6 (GREEN)          | LED ON = LOW | PA14           | 7                           | 18                          |
| DS7\_BLUE or RGB\_BLUE                     | RGB BLUE             | LED ON = LOW | PC25           | 136                         | 19                          |
| DS7\_RED or RGB\_RED                       | RGB RED              | LED ON = LOW | PD7            | 20                          | 20                          |
| DS7\_GREEN or RGB\_GREEN                   | RGB GREEN            | LED ON = LOW | PD8            | 21                          | 21                          |

## Buttons

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | -------------------- | -------------- | --------------------------- | --------------------------- |
| Button1                                    | TACT SW1             | Button pressed = LOW | PC27           | 138                         | 22                          |
| Button2                                    | TACT SW2             | Button pressed = LOW | PB6            | 121                         | 23                          |

## SD Card

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                  | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ---------------------- | -------------- | --------------------------- | --------------------------- |
| SD\_SW                                     | SD\_SW               | Card is inserted = LOW | PC30           | 103                         | 36                          |
| MCCK                                       | MCCK                 |                        | PA19           | 71                          | 37                          |
| MCCDA                                      | MCCDA                |                        | PA20           | 72                          | 38                          |
| MCDA0                                      | MCDA0                |                        | PA21           | 107                         | 39                          |
| MCDA1                                      | MCDA1                |                        | PA22           | 81                          | 40                          |
| MCDA2                                      | MCDA2                |                        | PA23           | 80                          | 41                          |
| MCDA3                                      | MCDA3                |                        | PA24           | 79                          | 42                          |

## SD Card SPI

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                    | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------------------------ | -------------- | --------------------------- | --------------------------- |
| SPI0\_CS1                                  | SPI0\_nCS1           | Not connected by default | PA29           | 112                         | 46                          |
| SPI0\_MOSI                                 | SPI0 MOSI            | Not connected by default | PA26           | 109                         | 44                          |
| SPI0\_CLK                                  | SPI0 CLK             | Not connected by default | PA27           | 110                         | 45                          |
| SPI0\_MISO                                 | SPI0 MISO            | Not connected by default | PA25           | 108                         | 43                          |

## 12-volt Outputs

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                         | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----------------------------- | -------------- | --------------------------- | --------------------------- |
| GPIO1                                      | GPIO1 A              | SOURCE (J5, Pin 2)            | PC3 (PWMH0)    | 60                          | 24                          |
| GPIO2                                      | GPIO2 A              | SOURCE (J5, Pin 2)            | PC5 (PWMH1)    | 63                          | 25                          |
| GPIO3                                      | GPIO3 A              | SOURCE (J5, Pin 2)            | PC7 (PWMH2)    | 65                          | 26                          |
| GPIO4                                      | GPIO4 A              | SINK (J5, Pin 2)              | PC9 (PWMH3)    | 67                          | 27                          |
| GPIO5                                      | GPIO5 A              | SINK (J5, Pin 2)              | PC20 (PWMH4)   | 131                         | 28                          |
| GPIO6                                      | GPIO6 A              | SINK (J5, Pin 2)              | PC19 (PWMH5)   | 101                         | 29                          |
| GPIO1\_B                                   | GPIO1 B              | PWML0 (Beta M2 Hardware only) | PC2  (PWML0)   | 59                          | 30                          |
| GPIO2\_B                                   | GPIO2 B              | PWML1 (Beta M2 Hardware only) | PC4  (PWML1)   | 116                         | 31                          |
| GPIO3\_B                                   | GPIO3 B              | PWML2 (Beta M2 Hardware only) | PC6  (PWML2)   | 64                          | 32                          |
| GPIO4\_B                                   | GPIO4 B              | PWML3 (Beta M2 Hardware only) | PC8  (PWML3)   | 66                          | 33                          |
| GPIO5\_B                                   | GPIO5 B              | PWML4 (Beta M2 Hardware only) | PC21 (PWML4)   | 132                         | 34                          |
| GPIO6\_B                                   | GPIO6 B              | PWML5 (Beta M2 Hardware only) | PC22 (PWML5)   | 133                         | 35                          |

## Analog Inputs (0-12V analog input)

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes     | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | --------- | -------------- | --------------------------- | --------------------------- |
| ANALOG\_1                                  | ANA 1                | J5 Pin 1  | PB19           | 90                          | 86                          |
| ANALOG\_2                                  | ANA 2                | J5 Pin 5  | PB18           | 89                          | 87                          |
| ANALOG\_3                                  | ANA 3                | J5 Pin 9  | PA2            | 85                          | 88                          |
| ANALOG\_4                                  | ANA 4                | J5 Pin 13 | PA4            | 83                          | 89                          |
| ANALOG\_5                                  | ANA 5                | J5 Pin 17 | PA3            | 84                          | 90                          |
| ANALOG\_6                                  | ANA 6                | J5 Pin 21 | PA16           | 78                          | 91                          |

## GPIO Power Supply Current Sense

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                                         | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | --------------------------------------------- | -------------- | --------------------------- | --------------------------- |
| I\_SENSE\_EN                               | 12Vio\_EN            | GPIO Power Supply Enable                      | PC24           | 135                         | 75                          |
| I\_SENSE                                   | I SENSE 12V          | GPIO Power Supply Analog Current Sense        | PB17           | 88                          | 93                          |
| I-SENSE\_INT                               | OVER\_CURRENT        | GPIO Power Supply Interrupt                   | PD1            | 14                          | 76                          |
| I-SENSE\_DAC                               | DAC1                 | GPIO Power Supply Analog Output to Comparator | PB16           | 77                          | 95                          |

## CAN

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----- | -------------- | --------------------------- | --------------------------- |
| CANRX0                                     | CANRX0               |       | PA1            | 24                          | 69                          |
| CANTX0                                     | CANTX0               |       | PA0            | 23                          | 70                          |
| CAN0\_CS or HS\_CS                         | HSC\_S               |       | PD3            | 16                          | 71                          |
| CANRX1                                     | CANRX1               |       | PB15           | 76                          | 72                          |
| CANTX1                                     | CANTX1               |       | PB14           | 140                         | 73                          |
| CAN1\_CS or MS\_CS                         | MSC\_S               |       | PD0            | 13                          | 25                          |

## Power Supplies

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                   | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----------------------- | -------------- | --------------------------- | --------------------------- |
| PS\_BUCK or BUCK\_DIS                      | BUCK\_nDIS           |                         | PC10           | 117                         | 48                          |
| PS\_J1850\_9141                            | J1850 9141 ON        | Bring LOW for LOW power | PB5            | 120                         | 49                          |

## J1850

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----- | -------------- | --------------------------- | --------------------------- |
| J1850\_PWM\_VPW                            | J1850\_PWM\_nVPW     |       | PB8            | 123                         | 50                          |
| J1850\_PWM\_RX                             | J1850\_PWM\_RX       |       | PC28           | 139                         | 51                          |
| J1850\_VPW\_RX                             | J1850\_VPW\_RX       |       | PC26           | 137                         | 52                          |
| J1850P\_TX                                 | J1850+\_TX           |       | PC18           | 100                         | 53                          |
| J1850N\_TX                                 | J1850-\_TX           |       | PC23           | 134                         | 54                          |

## XBEE

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes            | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ---------------- | -------------- | --------------------------- | --------------------------- |
| XBEE\_RX or RX0                            | XB\_UART RX          | UART serial URXD | PA8            | 27                          | 0                           |
| XBEE\_TX or TX0                            | XB\_UART TX          | UART serial UTXD | PA9            | 2                           | 1                           |
| XBEE\_RST                                  | XB\_nRST             |                  | PC11           | 93                          | 4                           |
| XBEE\_PWM                                  | XB\_RSSI\_PWM        |                  | PB3            | 118                         | 7                           |
| XBEE\_MULT4                                | XB\_MULT4            |                  | PD6            | 19                          | 11                          |
| XBEE\_MULT5                                | XB\_MULT5            |                  | PD9            | 22                          | 12                          |
| XBEE\_MULT1                                | XB\_MULT1            |                  | PC12           | 94                          | 8                           |
| XBEE\_CTS                                  | XB\_nCTS             |                  | PB26           | 1                           | 3                           |
| XBEE\_STAT                                 | XB\_STAT             |                  | PC13           | 95                          | 5                           |
| XBEE\_VREF                                 | XB\_Vref             |                  | PC14           | 96                          | 6                           |
| XBEE\_MULT2                                | XB\_MULT2            |                  | PC15           | 97                          | 9                           |
| XBEE\_RTS                                  | XB\_nRTS             |                  | PB25           | 144                         | 2                           |
| XBEE\_MULT3                                | XB\_MULT3            |                  | PC17           | 99                          | 10                          |
| XBEE\_MULT6                                | XB\_MULT6            |                  | PA7            | 26                          | 13                          |

![Image showing pin names of the XBEE socket on M2](/files/-Lhg6C7cUTL_woJr2iEU)

## 9141/LIN

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes   | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------- | -------------- | --------------------------- | --------------------------- |
| LIN\_KTX                                   | 9141 K TX            | Serial1 | PA11           | 4                           | 55                          |
| LIN\_KRX                                   | 9141 K RX            |         | PA10           | 3                           | 56                          |
| LIN\_KSLP                                  | 9141 K SLP           |         | PB4            | 119                         | 57                          |
| LIN\_LTX                                   | 9141 L TX            | Serial2 | PA13           | 6                           | 58                          |
| LIN\_LRX                                   | 9141 L RX            |         | PA12           | 5                           | 59                          |
| LIN\_LSLP                                  | 9141 L SLP           |         | PB7            | 122                         | 60                          |

## Single-wire CAN

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----- | -------------- | --------------------------- | --------------------------- |
| SWC\_M1                                    | SWC M1               |       | PB0            | 113                         | 65                          |
| SWC\_M0                                    | SWC M0               |       | PB27           | 68                          | 64                          |
| SWC\_SOF                                   | SWC SOF              |       | PC29           | 102                         | 68                          |
| SWC\_CLK                                   | SWC CLK              |       | PB22           | 141                         | 66                          |
| SPI0\_CS3                                  | SPI0\_nCS3           |       | PB23           | 142                         | 63                          |
| SWC\_INT                                   | SWC nINT             |       | PC16           | 98                          | 67                          |
| SWC\_RX0                                   | SWC nRX0BF           |       | PB1            | 114                         | 61                          |
| SWC\_RX1                                   | SWC nRX1BF           |       | PB2            | 115                         | 62                          |

## SPI0

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                           | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------------------------------- | -------------- | --------------------------- | --------------------------- |
| SPI0\_MISO                                 | SPI0 MISO            | Optionally connected to SD Card | PA25           | 108                         | 43                          |
| SPI0\_MOSI                                 | SPI0 MOSI            | Optionally connected to SD Card | PA26           | 109                         | 44                          |
| SPI0\_CLK                                  | SPI0 CLK             | Optionally connected to SD Card | PA27           | 110                         | 45                          |
| SPI0\_CS1                                  | SPI0\_nCS1           | Optionally connected to SD Card | PA29           | 112                         | 46                          |
| SPI0\_CS0                                  | SPI0\_nCS0           |                                 | PA28           | 111                         | 47                          |

## 26-Pin GPIO Connector (J5)

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | -------------------- | -------------- | --------------------------- | --------------------------- |
| TXD3                                       | UART3 TX             | J5 Pin 7 (3.3V UART) | PD4            | 17                          | 77                          |
| RXD3                                       | UART3 RX             | J5 Pin 8 (3.3V UART) | PD5            | 18                          | 78                          |
| SDA0                                       | SDA0                 | J5 Pin 4             | PA17           | 9                           | 79                          |
| SCL0                                       | SCL0                 | J5 Pin 3             | PA18           | 70                          | 80                          |
| SPI\_CS2                                   | USART2RX             | J5 Pin 15            | PB21           | 92                          | 83                          |

## Misc.

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                        | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ---------------------------- | -------------- | --------------------------- | --------------------------- |
| V\_SENSE                                   | AD3                  | Analogue input Vehicle Volts | PA6            | 82                          | 92                          |
| CPU\_TEMP or A15                           | Internal             | CPU Temperature              | PD5            | Internal                    | 94                          |

## EEPROM Memory

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes  | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------ | -------------- | --------------------------- | --------------------------- |
| SDA1                                       | SDA1                 | Eeprom | PB12           | 86                          | 81                          |
| SCL1                                       | SCL1                 | Eeprom | PB13           | 87                          | 82                          |

## CPU Test Point

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes         | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------------- | -------------- | --------------------------- | --------------------------- |
| USART2TX                                   | USART2TX             | TP5 U2TX      | PB20           | 91                          | 84                          |
|                                            | unconnected          | not connected | PC1            | 55                          | 85                          |
|                                            | UOTGVBOF             |               | PB10           | 128                         |                             |
|                                            | UOTGID               |               | PB11           | 129                         |                             |
|                                            | ERASE\_S             |               | PC0            | 130                         |                             |
|                                            | USART2 CK            |               | PB24           | 143                         |                             |

## CPU System Pins

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes                     | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ------------------------- | -------------- | --------------------------- | --------------------------- |
|                                            | VDDOUT               |                           | VDDCORE5       | 124                         |                             |
|                                            | +3.3V                |                           | VDDIO1         | 11                          |                             |
|                                            | +3.3V                |                           | VDDIO2         | 62                          |                             |
|                                            | +3.3V                |                           | VDDIO3         | 105                         |                             |
|                                            | +3.3V                |                           | VDDIO4         | 125                         |                             |
|                                            | DGND                 |                           | GND1           | 12                          |                             |
|                                            | DGND                 |                           | GND2           | 58                          |                             |
|                                            | DGND                 |                           | GND3           | 106                         |                             |
|                                            | DGND                 |                           | GND4           | 126                         |                             |
|                                            | DGND                 |                           | GNDPLL         | 33                          |                             |
|                                            | DGND                 |                           | GNDANA         | 74                          |                             |
|                                            | VDDPLL               |                           | VDDPLL         | 34                          |                             |
|                                            | XOUT                 | Crystal                   | XOUT           | 35                          |                             |
|                                            | XIN                  | Crystal                   | XIN            | 36                          |                             |
|                                            | D+                   | Micro USB pin3            | DHSDP          | 37                          |                             |
|                                            | D-                   | Micro USB pin2            | DHSDM          | 38                          |                             |
|                                            | VBUS                 | Micro USB pin1 +5Volts    | XUSB           | 39                          |                             |
|                                            | VBG                  |                           | VBG            | 40                          |                             |
|                                            | VDDUTMI              |                           | VDDUTMI        | 41                          |                             |
|                                            | DFSDP                |                           | DFSDP          | 42                          |                             |
|                                            | DFSDM                |                           | DFSDM          | 43                          |                             |
|                                            | DGND                 | Grounded pin              | GNDUTMI        | 44                          |                             |
|                                            | VDDOUT               |                           | GNDUTMI        | 45                          |                             |
|                                            | DGND                 | Grounded pin              | JTAGSEL        | 46                          |                             |
|                                            | M\_nRST/SWC nRESET   | MCP2515 Reset             | NRSTB          | 47                          |                             |
|                                            | XIN32                | N/C                       | XIN32          | 48                          |                             |
|                                            | XOUT32               | N/C                       | XOUT32         | 49                          |                             |
|                                            |                      | N/C                       | SHDN           | 50                          |                             |
|                                            |                      | Grounded via Resistor     | TST            | 51                          |                             |
|                                            |                      | +3.3V via Resistor        | VDDBU          | 52                          |                             |
|                                            |                      | +3.3V via Resistor        | FWUP           | 53                          |                             |
|                                            |                      | Grounded pin              | GNDBU          | 54                          |                             |
|                                            | VDDOUT               |                           | VDDOUT         | 56                          |                             |
|                                            | +3.3V                |                           | VDDIN          | 57                          |                             |
|                                            | TP5                  |                           | NRST           | 69                          |                             |
|                                            | VDDANA               | VoltageAnalogue           | VDDANA         | 73                          |                             |
|                                            | DGND                 | Ground Analogue           | GNDANA         | 74                          |                             |
|                                            | DGND                 | Analogue Digital Volt ref | ADVREF         | 75                          |                             |
|                                            |                      |                           | PB9            | 127                         |                             |

## JTAG

| Mapped Pin Name (use these in your sketch) | M2 Board Signal Name | Notes | SAM3X Pin Name | Processor CHIP physical PIN | PinDescription Array Number |
| ------------------------------------------ | -------------------- | ----- | -------------- | --------------------------- | --------------------------- |
|                                            | JTAG-TCK             | TP1   | PB28           | 28                          |                             |
|                                            | JTAG-TDI             | TP2   | PB29           | 29                          |                             |
|                                            | JTAG\_TDO            | TP3   | PB30           | 30                          |                             |
|                                            | JTAG-TMS             | TP4   | PB31           | 31                          |                             |


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