The Intel Joule expansion board is supported by Mraa
Intel Joule expansion board
SPI
Two SPI buses are available, with one chipselect each. Pins listed are MRAA numbered pins. Other chip selects are available if enabled in BIOS/EEPROM but cannot be enabled as BIOS options. You will need the spidev kernel module loaded, Ostro-XT and ref-os-iot does this by default.
Bus 0 (32765) MOSI = 4 MISO = 2 CS = 6 CLK = 10
Bus 1 (32766) MOSI = 67 MISO = 69 CS0 = 59 CS1 = 61 CLK = 65
(remove 40 from numbers to get pin header number for pins on low speed header 2)
UART Some pins are labelled as UARTs but are not configured in BIOS as UART so only available UART is on the FTDI header. Disable the getty on ttyS2 and use mraa's uart raw mode to initialise on ttyS2. The Jumper J8 can be used to switch between using the FTDI 6 pin header and the micro USB output.
The Intel Joule expansion board has two breakouts, breakout #1 is 1-40 whilst breakout2 is 41-80. The LEDs are numbered from 100-103.
ISH UART are named as: IURT. ISH I2C are named as:IIC.
| MRAA Number | Physical Pin | Function |
|---|---|---|
| 1 | GPIO | GPIO |
| 2 | SPP1RX | GPIO SPI |
| 3 | PMICRST | NONE |
| 4 | SPP1TX | GPIO SPI |
| 5 | 19.2mhz | GPIO |
| 6 | SPP1FS0 | GPIO SPI |
| 7 | UART0TX | GPIO |
| 8 | SPP1FS2 | GPIO SPI |
| 9 | PWRGD | NONE |
| 10 | SPP1CLK | GPIO SPI |
| 11 | I2C0SDA | I2C |
| 12 | I2S1SDI | GPIO |
| 13 | I2C0SCL | I2C |
| 14 | I2S1SDO | GPIO |
| 15 | IIC0SDA | I2C |
| 16 | I2S1WS | GPIO |
| 17 | IIC0SCL | I2C |
| 18 | I2S1CLK | GPIO |
| 19 | IIC1SDA | I2C |
| 20 | I2S1MCL | GPIO |
| 21 | IIC1SCL | I2C |
| 22 | UART1TX | UART |
| 23 | I2S4SDO | NONE |
| 24 | UART1RX | UART |
| 25 | I2S4SDI | NONE |
| 26 | PWM0 | GPIO PWM |
| 27 | I2S4BLK | GPIO |
| 28 | PWM1 | GPIO PWM |
| 29 | I2S4WS | NONE |
| 30 | PWM2 | GPIO PWM |
| 31 | I2S3SDO | NONE |
| 32 | PWM3 | GPIO PWM |
| 33 | I2S3SDI | NONE |
| 34 | 1.8V | NONE |
| 35 | I2S4BLK | GPIO |
| 36 | GND | NONE |
| 37 | GND | NONE |
| 38 | GND | NONE |
| 39 | GND | NONE |
| 40 | 3.3V | NONE |
| 41 | GND | NONE |
| 42 | 5V | NONE |
| 43 | GND | NONE |
| 44 | 5V | NONE |
| 45 | GND | NONE |
| 46 | 3.3V | NONE |
| 47 | GND | NONE |
| 48 | 3.3V | NONE |
| 49 | GND | NONE |
| 50 | 1.8V | NONE |
| 51 | GPIO | GPIO |
| 52 | 1.8V | NONE |
| 53 | PANEL | GPIO |
| 54 | GND | NONE |
| 55 | PANEL | GPIO |
| 56 | CAMERA | NONE |
| 57 | PANEL | GPIO |
| 58 | CAMERA | NONE |
| 59 | SPP0FS0 | GPIO SPI |
| 60 | CAMERA | NONE |
| 61 | SPP0FS1 | GPIO SPI |
| 62 | SPI_DAT | SPI |
| 63 | SPP0FS2 | GPIO SPI |
| 64 | SPICLKB | GPIO |
| 65 | SPI0CLK | GPIO SPI |
| 66 | SPICLKA | GPIO |
| 67 | SPP0TX | GPIO SPI |
| 68 | UART0RX | GPIO UART |
| 69 | SPP0RX | GPIO SPI |
| 70 | UART0RT | GPIO UART |
| 71 | I2C1SDA | I2C |
| 72 | UART0CT | GPIO UART |
| 73 | I2C1SCL | I2C |
| 74 | IURT0TX | GPIO UART |
| 75 | I2C2SDA | I2C |
| 76 | IURT0RX | GPIO UART |
| 77 | I2C2SCL | I2C |
| 78 | IURT0RT | GPIO UART |
| 79 | RTC_CLK | GPIO |
| 80 | IURT0CT | GPIO UART |
| 100 | LED100 | GPIO |
| 101 | LED101 | GPIO |
| 102 | LED102 | GPIO |
| 103 | LED103 | GPIO |
| 104 | LEDWIFI | GPIO |
| 105 | LEDBT | GPIO |
To see a live pin mapping use the command: $ mraa-gpio list