Touch (UCB1400)
This describes the touch-driver for the UCB1400-codec found on the Trizeps-module.
Registry Keys
| ||
|---|---|---|
Key | Type | Description |
MaxSigma | DWORD | Maximum deviation. Higher deviation will invalidate the read touch-samples. If using noisy displays, it might help to increase this value. |
InitSamples | DWORD | How many samples to ignore after touch-press. |
PressureL | DWORD | Low pressure (0..65536), Default=12. Value at which touch-pen up is detected. (UCB1400-Codec) |
PressureH | DWORD | High pressure (0..65536), Default=31. Value at which touch-pen down is detected. (UCB1400-Codec) |
WolfsonPressureH | DWORD | Pressure at which a touch-pen down is detected. Default: 260. Higher-values = More sensitive. |
ArraySize | DWORD | Number of samples to take to determine average value. |
SyncWithHsync | DWORD | Set to 0. Option to synchronize measurement with HSync of display. |
VRefBypass | DWORD | Set to 0. Use to enable external reference-voltage. |
InhibitIdle | DWORD | Inhibit idle, if touch is pressed. If the touch is sensitive against change of current consumption, setting this might help |
SampleDelay | DWORD | Number of micro-seconds to wait after each sample |
OldScale | DWORD | Set to 0. Used to scale touch-values, like it was done on the older version of this driver. |
SampleTimer | DWORD | Sample-Frequency (Trizeps2+3 only): Expressed in number of system-ticks (3686400 Hz). Trizeps4+5: in us |
DisableFilter | DWORD | Disable ADC filter if set to 1 |
REG78h | DWORD | Sets AC97-Register 0x78.
Set to (0x6900 | div).
Codec uses a 68k Pull up
and a 1,8V threshold value.
div = 68k / (((3,3V/1,8V)*Rtouch)-Rtouch)
Touch (pen-down) resistance -> div value
For 2,5kOhm -> div = 32.64
( Use Maximum value of 31 !).
For 5kOhm -> div = 16
For 10kOhm -> div = 8
(only Wolfson Codec) |
See Also
Connect a 4-wire Touch to a Trizeps,
Connect a 5-Wire Touch Panel to the Trizeps 4-wire Touch Controller