CPT112S_I2C
Detailed Description
Silicon Labs 12-pad Capacitive Touch Evaluation Board I2C driver.
I2C data structure
For CPT112S there are 12 capsense outputs, each pin corresponds to a capsenseCurrent bit showing whether a cap-sense button pressed or not, and capsensePrevious bit showing the status of previous cycle.
If capsenseCurrent==1 && capsensePrevious==0, detects a "press" If capsenseCurrent==0 && capsensePrevious==1, detects a "release"
capsenseCurrent bit-map byte: | N/A | N/A | N/A | N/A| cC11 | cC10| cC9 | cC8 | | cC7 | cC6 | cC5 | cC4 | cC3 | cC2 | cC1 | cC0 |
capsensePrevious bit-map byte: | N/A | N/A | N/A | N/A| cP11 | cP10| cP9 | cP8 | | cP7 | cP6 | cP5 | cP4 | cP3 | cP2 | cP1 | cP0 |
*cC,cP are abbreviation for capsenseCurrent and capsensePrevious
Macros |
|
| #define | CPT112S_I2C_ADDRESS 0xE0 |
| #define | CPT112S_I2C_RELEASE_EVENT 1 |
| #define | CPT112S_I2C_RXBUFFER_SIZE 3 |
| #define | CPT112S_I2C_SLIDER_ACTIVITY 2 |
| #define | CPT112S_I2C_TOUCH_EVENT 0 |