Touch controller with improved diagnostics calibration and communications support
A touch controller with improved diagnostics calibration and communication support includes a data capture register configured to sample data from one or a plurality of touch panel sense channels at an output of an analog to digital (A/D) converter. The sampled data is bit packed, and a demodulation waveform is captured, correlated with the sampled data. The contents of the data capture register, including the sampled data and the demodulation waveform, are transferred to a memory configured to create one or more records from the transferred contents. A processor can be used to extract the one or more records captured in the memory to display to a user for diagnostics or calibration.
1. A method, comprising;
sampling data from one or a plurality of touch panel sense channels prior to demodulation;
capturing a demodulation waveform, correlated with the sampled data, to form a record;
storing one or a plurality of records; and
accessing the one or a plurality of records to extract diagnostics information.
2. The method of claim 1 , further comprising:
displaying at least part of the one or a plurality of records.
3. The method of claim 1 , further comprising:
automatically calibrating a gain of the one or a plurality of sense channels based at least in part on one or more captured records.
4. The method of claim 3 , further comprising capturing minimum and maximum amplitude data to compute the gain of the one or a plurality of sense channels.
5. The method of claim 1 , further comprising:
determining a relative phase shift between the sampled data and the demodulation waveform.
6. The method of claim 5 , further comprising:
automatically calibrating a phase of the one or a plurality of sense channels, based at least in part on one or more captured records.
7. The method of claim 1 , wherein the one or a plurality of records are captured when a start bit is stored in a start register.
8. The method of claim 1 , wherein N records are captured, wherein N is an integer greater than or equal to 1, and depends on a programmable integration period.
9. The method of claim 8 , wherein each record includes a predetermined number of sense channel outputs and a correlating demodulation waveform.
10. The method of claim 1 , wherein the sampled data is composite touch data.
11. The method of claim 1 , wherein the touch panel sense channel is incorporated within a computing system.
12. A touch controller, comprising;
a data capture register configured to sample data from one or a plurality of touch panel sense channels prior to demodulation, and to capture a demodulation waveform correlated with the sampled data;
a memory configured to form a record, including the sampled data and the demodulation waveform, and to store one or a plurality of records; and
a processor configured to access the one or a plurality records to extract diagnostics information.
13. The touch controller of claim 12 , wherein the processor is further configured to automatically calibrate a gain of the one or a plurality of sense channels, based on at least part of the one or more records captured in the memory.
14. The touch controller of claim 13 , further comprising a min/max register configured to capture minimum and maximum amplitude data to compute the gain of the one or a plurality of sense channels.
15. The touch controller of claim 12 , wherein the processor is further configured to determine a relative phase shift between the sampled data and the demodulation waveform.
16. The touch controller of claim 15 , wherein the processor is further configured to automatically calibrate a phase of the one or a plurality of sense channels, based on at least part of the one or more records captured in the memory.
17. The touch controller of claim 12 , wherein the memory is coupled to a start register, and the memory is configured to capture the one or a plurality of records when a start bit is stored in the start register.
18. The touch controller of claim 12 , wherein the memory is configured to capture N records, wherein N is an integer greater than or equal to 1, and depends on a programmable integration period.
19. The touch controller of claim 18 , wherein each record includes a predetermined number of sense channel outputs and a correlating demodulation waveform.
20. The touch controller of claim 12 , wherein the sampled data is composite touch data.
21. The touch controller of claim 12 , wherein the plurality of touch panel sense channels are within a touch sensor panel.
22. The touch controller of claim 21 , wherein the touch sensor panel is incorporated within a computing system.
23. A system, comprising:
means for sampling data from one or a plurality of touch panel sense channels prior to demodulation;
means for capturing a demodulation waveform, correlated with the sampled data, to form a record;
means for storing one or a plurality of records; and
means for accessing the one or a plurality of records to extract diagnostics information.