mraa  1.8.0
Low Level Skeleton Library for Communication on GNU/Linux platforms
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Intel Joule

http://www.intel.com/joule

The Intel Joule expansion board is supported by Mraa

Revision Support

Intel Joule expansion board

Interface notes

SPI

Two SPI buses are available, one with three and another one with two chipselects. In MRAA terms an SPI "bus" (denoted by a number) is a combination of an actual bus + specific chipselect on this bus. In view of that + taking into account that SPI1CS1 is not available on the board, in MRAA the above translates into five available bus numbers - from 0 to 4, covering SPI0CS0 to SPI1CS2.

Pins listed are MRAA numbered pins. You will need the spidev kernel module loaded with appropriate board configuration for binding, Ref-OS-IoT does not enable this by default.

MRAA bus # Ref-OS-IoT bus # Joule docs bus # MOSI MISO CLK CS
0 32766 SPI0 67 (J13-27)69 (J13-29) 65 (J13-25) 59 (J13-19)
1 32766 SPI0 67 (J13-27)69 (J13-29) 65 (J13-25) 61 (J13-21)
2 32766 SPI0 67 (J13-27)69 (J13-29) 65 (J13-25) 63 (J13-23)
3 32765 SPI1 4 (J12-4)2 (J12-2) 10 (J12-10) 6 (J12-6)
4 32765 SPI1 4 (J12-4)2 (J12-2) 10 (J12-10) 8 (J12-8)

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.

Pin Mapping

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