The TSC2007 is 4 wire I2C touch screen controller. It interfaces with the Touch panel with a 4 wire Interface (X+,X-,Y+,Y-) and with a I2C + a interrupt line with the microcontroller.
The interrupt line is called PENIRQ
The TSC2007 allows for HW configuratino of the two LSB of the address. Those are configured in tsc2007_driver_hw_conf.h with the defines:
TSC2007_A1_HW_CONFTSC2007_A1_HW_CONF
The MCU acts as master while the TSC2007 acts as slave
- Standard Mode
- I2C speed 100
- Raise time 100
- Fall time 100
- Coefficient of Digital Filter 15
- Analog filter Enabled
The PENIRQ itnerrupt shall be connected to a GPIO. This GPIO shall be configured as External Interrupt Mode with Risin/Falling edge trigger detection
The driver works with a polling scheme. The polling can be done in blocking or interrupt mode. Before the polling functions it is necessary to:
TSC2007_RegisterI2CHandler(...): register the I2C that is used.TSC2007_Init(...): Initialize the drivers.
Calling Task_TSC2007Driver will read the X/Y/Z information from the driver and process the received information.
The last read position can be retrieved with bool TSC2007_SampleTouch(uint16_t * x, uint16_t *y);
Calling Task_TSC2007DriverIT will trigger a read of the X/Y/Z information from the driver and process the received information.
The last read position can be retrieved with bool TSC2007_SampleTouch(uint16_t * x, uint16_t *y);
TSC2007_PENIRQ(...): triggered by PENIRQ including the value of the status of the GPIO (currently not used)TSC2007_I2C_RxCompleteCallback(...): I2C Rx Complete CallbackTSC2007_I2C_TxCompleteCallback(...): I2C Tx Complete Callback
- Tested with STM32F767