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Ampire 5.7" TFT Configuration

 

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This page provides configuration information for the Ampire 5.7" TFT LCD when used with the MECS Tellurium platform and compatible Colibri module.

Backlight Control

For the Ampire 5.7" VGA (640x480) LED backlight TFT LCD, the backlight is controlled via PWM0, allowing Backlight brightness to be controlled by varying the PWM duty cycle (please refer to the display datasheet for frequency settings and duty cycle ranges). Brightness control via PWM is not currently supported in the default Colibri WinCE image, and therefore requires the user to implement if required.

Backlight on/off control is supported in the default Colibri WinCE image; the default control signal for backlight on/off control is BL_ON. To configure the default image to use the PWM0 signal as the display control signal, the registry parameter BL_GPIO must be set to use the GPIO corresponding to the signal PWM0 on SODIMM pin 30, which is dependent upon the Colibri module being used:

For PXA270 based Colibri modules, SODIMM pin 30 corresponds to GPIO16

[HKEY_LOCAL_MACHINE\Drivers\Display\Colibri]
BL_GPIO=dword:0x00000010
  • For PXA300 based Colibri modules, SODIMM pin 30 corresponds to GPIO17
[HKEY_LOCAL_MACHINE\Drivers\Display\Colibri]
BL_GPIO=dword:0x00000011
  • For PXA320 based Colibri modules, SODIMM pin 30 corresponds to GPIO11
[HKEY_LOCAL_MACHINE\Drivers\Display\Colibri]
BL_GPIO=dword:0x0000000b

Note that the WinCE desktop can be accessed via the Remote Display tool which can be downloaded from the Toradex website in the event that changes need to be made to registry settings and the display is not visible at power on.