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AXEL ULite Hardware Manual
6.3
HMI configuration – use case 1
The following scenario shows a possible example of an HMI appliance
where the User Interface is the most important functionality. The LCD
controller and the touchscreen controller are the main interfaces used for
the HMI interaction.
In the paragraph below you can find a possible peripherals' configuration
list that configure the system as an HMI
Remember that some standard peripherals in the list above are required
to configure your system.
This configuration suppose to use:
● LCD controller with Backlight PWM
● touchscreen controller interfaced via I2C or SPI peripherals
● 4x4 matrix keypad
● ethernet controller for remote connection (Ethernet on Invariant
● up to four UARTs for interfacing to the actuators to be controlled
● synchronous audio interface SAI for external codec (I2S or
● SD interface for recovery ans storage (SD1 on Invariant base)
● NOR flash for boot and NAND flash for root file system (NOR
6.3.1
LCD controller
The I.MX6UL integrates an LCD Controller which provides support for up
to 24-bit data output (RGB, 8 bits-per-pixel) and up to WXGA (1366x768)
resolution at 60Hz.
It can drive a wide range of devices with different size and capability.
The following table describes the interface signals:
Pin Name
LCD_DATA_ENABLE
LCD_RESET
LCD_VSYNC
base)
AC97)
and NAND on Invariant base)
Pin
J2.124
J2.126
J2.128
v.1.0.2
Internal Connections
CPU.LCD_DATA_ENABLE
CPU.LCD_RESET
CPU.LCD_VSYNC
August, 2019
Ball/pin #
B8
E9
C9
43/65
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