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This article details how physical devices are mapped to Linux device files in the context of the XUELK kit.
Contents
Console UARTEdit
| Physical device | Processor's resource | Connector | Type | Linux device file | Notes |
|---|---|---|---|---|---|
| Boot Console | UART1 | J42 | 2-wire LVTTL UART | /dev/ttymxc0 |
Multi-protocol UARTsEdit
Ordering code: XUBxx0xxx0xEdit
| Physical device | Processor's resource | Connector | Type | Linux device file | Notes |
|---|---|---|---|---|---|
| MPUART0 | UART7 | J34 | 2-wire RS232 | /dev/ttymxc6 |
|
| MPUART1 | UART3 | J21 | RS485 | /dev/ttymxc2 |
Ordering code: XUBxx0xxx1xEdit
| Physical device | Processor's resource | Connector | Type | Linux device file | Notes |
|---|---|---|---|---|---|
| MPUART0 | UART8 | J34 | 2-wire RS232 | /dev/ttymxc7 |
|
| MPUART1 | UART3 | J21 | RS485 | /dev/ttymxc2 |
UART2 on mezzanine connector J53Edit
Please note that this UART is not available if WiFi/Bluetooth module is populated.
| Processor's resource | Connector | Type | Linux device file | Notes |
|---|---|---|---|---|
| UART2 | J53 | 4-wire LVTTL | /dev/ttymxc1 |
GPIOs on mezzanine connector J53Edit
| Processor's resource | Connector | Type | Linux device file | Notes |
|---|---|---|---|---|
| MX6UL_PAD_UART5_RX_DATA__GPIO1_IO31 | J53 | LVTTL GPIO | GPIO #31 | see following examples |
| MX6UL_PAD_UART5_TX_DATA__GPIO1_IO30 | J53 | LVTTL GPIO | GPIO #30 | see following examples |
| MX6UL_PAD_LCD_DATA19__GPIO3_IO24 | J53 | LVTTL GPIO | GPIO #24 | see following examples |
| MX6UL_PAD_LCD_DATA22__GPIO3_IO27 | J53 | LVTTL GPIO | GPIO #27 | see following examples |
| MX6UL_PAD_LCD_DATA23__GPIO3_IO28 | J53 | LVTTL GPIO | GPIO #28 | see following examples |
The following commands can be issued from command line in order to configure GPIO #30 as output:
echo 30 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio30/direction
To set the GPIO #30 to 0 logical value:
echo 0 > /sys/class/gpio/gpio30/value
To set the GPIO #30 to 1 logical value:
echo 1 > /sys/class/gpio/gpio30/value
The following commands can be issued from command line in order to configure GPIO #30 as input:
echo 30 > /sys/class/gpio/export echo in > /sys/class/gpio/gpio30/direction
To read the GPIO value:
cat /sys/class/gpio/gpio$i/value
WiFi/BluetoothEdit
Please refer to this page.