| * TI - TSC ADC (Touschscreen and analog digital converter) |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| |
| Required properties: |
| - child "tsc" |
| ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen |
| support on the platform. |
| ti,x-plate-resistance: X plate resistance |
| ti,coordinate-readouts: The sequencer supports a total of 16 |
| programmable steps each step is used to |
| read a single coordinate. A single |
| readout is enough but multiple reads can |
| increase the quality. |
| A value of 5 means, 5 reads for X, 5 for |
| Y and 2 for Z (always). This utilises 12 |
| of the 16 software steps available. The |
| remaining 4 can be used by the ADC. |
| ti,wire-config: Different boards could have a different order for |
| connecting wires on touchscreen. We need to provide an |
| 8 bit number where in the 1st four bits represent the |
| analog lines and the next 4 bits represent positive/ |
| negative terminal on that input line. Notations to |
| represent the input lines and terminals resoectively |
| is as follows: |
| AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7. |
| XP = 0, XN = 1, YP = 2, YN = 3. |
| - child "adc" |
| ti,adc-channels: List of analog inputs available for ADC. |
| AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7. |
| |
| Example: |
| tscadc: tscadc@44e0d000 { |
| compatible = "ti,am3359-tscadc"; |
| tsc { |
| ti,wires = <4>; |
| ti,x-plate-resistance = <200>; |
| ti,coordiante-readouts = <5>; |
| ti,wire-config = <0x00 0x11 0x22 0x33>; |
| }; |
| |
| adc { |
| ti,adc-channels = <4 5 6 7>; |
| }; |
| } |
