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UM0851 bảng dữ liệu(PDF) 174 Page - STMicroelectronics

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UM0851 bảng dữ liệu(HTML) 174 Page - STMicroelectronics

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Human interface device (HID) drivers
UM0851
174/245
Doc ID 16604 Rev 2
7
Human interface device (HID) drivers
This section groups all drivers related to SPEAr human interface devices.
7.1
Touchscreen driver
7.1.1
Hardware overview
There is no dedicated Touchscreen controller in SPEAr. Instead, a combination of ADC and
GPIO functions are used for Touchscreen operation. ADC channels 5 and 6 are used to
read the X and Y-coordinates respectively. By pulling GPIO high or low the device-driver
selects either ADC Channel 5 or 6.
Figure 45.
Interfacing between CLCD panel and SPEAr
7.1.2
Software overview
The touchscreen device driver reads all the touch related value from the ADC channels and
provides all the necessary functions for the application via the standard Linux Input Device
Layer Interface. The overall touchscreen software system architecture is represented in the
Figure 46.
SPEAr
CLCD panel
ADC channel 5
ADC channel 6
GPIO pin
(product specific)



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