Table A-1 presents the I/O mappings for Intel Galileo. This table is the official port I/O mapping provided by Intel and also can be found accessing “
https://communities.intel.com/docs/DOC-21920”.Table A-1.
Intel Galileo I/O Mappings
Pin | GPIO | PWM Linux | Int | Dir | Muxed with | ||
|---|---|---|---|---|---|---|---|
Source | Pin | Linux | |||||
IO0 | Cypr | GPORT4_BIT6_PWM2 | 50 | N/A | - | BI | UART0_RXD |
IO1 | Cypr | GPORT4_BIT7_PWM0 | 51 | N/A | - | BI | UART0_TXD |
IO2 | SoC (Cypr) | GPIO<6> (GPORT2_BIT0_PWM6_A3) | 14 (32*) | - | 0 | BI | - |
IO3 | SoC (Cypr) | GPIO<7> (GPORT0_BIT2_PWM3) | 15 (18*) | 3 | 1 | BI | (PWM) |
IO4 | Cypr | GPORT1_BIT4_PWM6 | 28 | - | BI | - | |
IO5 | Cypr | GPORT0_BIT1_PWM5 | 17 | 5 | - | BI | (PWM) |
IO6 | Cypr | GPORT1_BIT0_PWM6 | 24 | 6 | - | BI | (PWM) |
IO7 | Cypr | GPORT1_BIT3_PWM0 | 27 | - | BI | - | |
IO8 | Cypr | GPORT1_BIT2_PWM2 | 26 | - | BI | - | |
IO9 | Cypr | GPORT0_BIT3_PWM1 | 19 | 1 | - | BI | (PWM) |
IO10 | Cypr | GPORT0_BIT0_PWM7 | 16 | 7 | - | BI | (PWM) SPI1_SS_B |
IO11 | Cypr | GPORT1_BIT1_PWM4 | 25 | 4 | - | BI | (PWM) SPI1_MOSI |
IO12 | Cypr | GPORT3_BIT2_PWM3 | 38 | - | BI | SPI1_MISO | |
IO13 | Cypr | GPORT3_BIT3_PWM1 | 39 | - | BI | SPI1_SCK | |
IO14 | Cypr | GPORT4_BIT0_PWM6 | 44 | - | BI | AD7298:VIN0 | |
IO15 | Cypr | GPORT4_BIT1_PWM4 | 45 | - | BI | AD7298:VIN1 | |
IO16 | Cypr | GPORT4_BIT2_PWM2 | 46 | - | BI | AD7298:VIN2 | |
IO17 | Cypr | GPORT4_BIT3_PWM0 | 47 | - | BI | AD7298:VIN3 | |
IO18 | Cypr | GPORT4_BIT4_PWM6 | 48 | - | BI | AD7298:VIN4 | |
IO19 | Cypr | GPORT4_BIT5_PWM4 | 49 | - | BI | AD7298:VIN5 |
Following are acronyms for Table A-1:
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Cypr: Crypress GPIO Expander
-
BI: Bidirectional
-
I: Input without pull-up off
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Int: Interruption pins
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Dir: Direction
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Table A-2 presents the Mux Selectors for Intel Galileo.
Table A-2.
Intel Galileo Muxing
Mux Selector | Cypress GPIO pin | Linux GPIO ID | Dir | Initial Setup | |
|---|---|---|---|---|---|
0 | 1 | ||||
UART0_RXD | IO0 | GPORT3_BIT4_PWM7 | 40 | O | U |
UART0_TXD | IO1 | GPORT3_BIT5_PWM5 | 41 | O | U |
SPI1_SS_B | IO10 | GPORT3_BIT6_PWM3 | 42 | O | U |
SPI1_MOSI | IO11 | GPORT3_BIT7_PWM1 | 43 | O | U |
SPI1_MISO | IO12 | GPORT5_BIT2_PWM3 | 54 | O | U |
SPI1_SCK | IO13 | GPORT5_BIT3_PWM1 | 55 | O | U |
AD7298:VIN0 | IO14 | GPORT3_BIT1_PWM5 | 37 | O | LOW |
AD7298:VIN1 | IO15 | GPORT3_BIT0_PWM7 | 36 | O | LOW |
AD7298:VIN2 | IO16 | GPORT0_BIT7_PWM1 | 23 | O | LOW |
AD7298:VIN3 | IO17 | GPORT0_BIT6_PWM3 | 22 | O | LOW |
AD7298:VIN4 | IO18 | GPORT0_BIT5_PWM5 | 21 | O | LOW |
AD7298:VIN5 | IO19 | GPORT0_BIT4_PWM7 | 20 | O | LOW |
IO2 via SoC GPIO<6> | IO2 via Cypress GPORT2_BIT0_PWM6 | GPORT1_BIT7_PWM0 | 31 | O | U |
IO3 via SoC GPIO<7> | IO3 via Cypress GPORT0_BIT2_PWM3 | GPORT1_BIT6_PWM2 | 30 | O | U |
I2C | (AD7298:VIN4 or IO18) and (AD7298:VIN5 or IO19) | GPORT1_BIT5_PWM4 | 29 | O | HIGH |
Following are acronyms for Table A-2:
-
O: Output
-
Dir: Direction
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U: Undefined
The following commands demonstrated some examples how to use the table using Linux terminal shell:
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Setting IO7 as GPIO output:
echo -n "27" > /sys/class/gpio/export
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echo -n "out" > /sys/class/gpio/gpio27/direction
echo 0 > /sys/class/gpio/gpio27/value # will set OUTPUT as LOW
echo 1 > /sys/class/gpio/gpio27/value # will set OUTPUT as HIGH
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Setting IO7 as GPIO input:
echo -n "27" > /sys/class/gpio/export
echo -n "in" > /sys/class/gpio/gpio27/direction
cat /sys/class/gpio/gpio27/value
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