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Code Examples

taas_3144281
Valued Contributor

Hi.

This sample uses CY8CKIT-149.

This sample displays the Cp values of each buttons to the serial terminal at start up.

After that button press(es) will be reflected to the corresponding LEDs.

I hope this sample helps in evaluating CapSense.

pastedImage_3.png

schematics

Pin list

pastedImage_2.png

main.c

====================================================================

/*******************************************************************************

*   Included Headers

*******************************************************************************/

#include "CapSense.h"

#include <project.h>

#include "stdio.h"

/*****************************************************************************

* MACRO Definitions

*****************************************************************************/  

#define LED_ON      (0u)        /* Pin state to turn ON an active-LOW LED */

#define LED_OFF     (1u)        /* Pin state to turn OFF an active-LOW LED */

/* Finite state machine for device operating states

    SENSOR_SCAN - Sensors are scanned in this state

    WAIT_FOR_SCAN_COMPLETE - CPU is put to sleep in this state

    PROCESS_DATA - Sensor data is processed, LEDs are controlled,

                   and I2C buffer is updated in this state */

typedef enum

{

    SENSOR_SCAN = 0x01u,              

    WAIT_FOR_SCAN_COMPLETE = 0x02u,   

    PROCESS_DATA = 0x03u,             

} DEVICE_STATE;

/*****************************************************************************

* Function Prototypes

*****************************************************************************/

void TestSensorCapacitance(void) ; /* same with CapSense_RunSelfTest(CapSense_TST_SNS_CAP) ; */

void cls() ;

void print(char *str) ;

#define STR_LEN 64

char str[STR_LEN+1] ;

int main()

{

          

    /* Variable to hold the current device state

    *  State machine starts with Sensor_Scan state after power-up

    */

    DEVICE_STATE currentState = SENSOR_SCAN;

         

     /* Enable global interrupts. */

    CyGlobalIntEnable;

  

    //sizeof(CapSense_dsRam),

    //(uint8_t *)&(CapSense_dsRam));

    CapSense_Start(); /* Initialize Component */

  

    /*CapSense Cp value check */

    CapSense_RunSelfTest(CapSense_TST_RUN_SELF_TEST_MASK) ;

  

    UART_Start() ;

  

    print("CapSense cp\n ") ;  

    snprintf(str, STR_LEN, "BTN0(%d) BTN1(%d) BTN2(%d) \n\r",

         CapSense_BTN0_SNS_CP0_VALUE , CapSense_BTN1_SNS_CP0_VALUE, CapSense_BTN2_SNS_CP0_VALUE ) ;

    print(str) ;

  

    for(;;)

    {

        /* Switch between SENSOR_SCAN->WAIT_FOR_SCAN_COMPLETE->PROCESS_DATA states */

        switch(currentState)

        {

            case SENSOR_SCAN:

            /* Initiate new scan only if the CapSense block is idle */

                if(CapSense_NOT_BUSY == CapSense_IsBusy())

                {

                    #if ENABLE_TUNER

                        /* Update CapSense parameters set via CapSense tuner before the

                           beginning of CapSense scan

                        */

                        CapSense_RunTuner();

                    #endif

                  

                    /* Scan widget configured by CSDSetupWidget API */

                    CapSense_ScanAllWidgets();

                                      

                    /* Set next state to WAIT_FOR_SCAN_COMPLETE  */

                    currentState = WAIT_FOR_SCAN_COMPLETE;

                }

                break;

            case WAIT_FOR_SCAN_COMPLETE:

                /* Put the device to CPU Sleep until CapSense scanning is complete*/

                if(CapSense_NOT_BUSY != CapSense_IsBusy())

                {

                    CySysPmSleep();

                }

                /* If CapSense scanning is complete, process the CapSense data */

                else

                {

                    currentState = PROCESS_DATA;

                }

                break;

      

            case PROCESS_DATA:

                             

                /* Process data on all the enabled widgets */

                CapSense_ProcessAllWidgets();

              

                /* Controls LEDs Status based on the result of Widget processing. */

                LED_13_Write(CapSense_IsWidgetActive(CapSense_BTN0_WDGT_ID) ? LED_ON : LED_OFF );

                LED_12_Write(CapSense_IsWidgetActive(CapSense_BTN1_WDGT_ID) ? LED_ON : LED_OFF );

                LED_11_Write(CapSense_IsWidgetActive(CapSense_BTN2_WDGT_ID) ? LED_ON : LED_OFF );

                    

              

                /* Set the device state to SENSOR_SCAN */

                currentState = SENSOR_SCAN;

                break;

           

            /*******************************************************************

             * Unknown power mode state. Unexpected situation.

             ******************************************************************/  

            default:

                break;

        }

    }

}

void cls(void)

{

    print("\033c") ; /* reset */

    CyDelay(20) ;

    print("\033[2J") ; /* clear screen */

    CyDelay(20) ;

}

void print(char *str)

{

    UART_UartPutString(str) ;

}

/* [] END OF FILE */

====================================================================

Thanks,

Asanuma

1 Reply
Hari
Moderator
Moderator

Hello Asanuma-san,

Thank you for sharing your example project with the community.

I see that you are using CapSense V5.0 in this project, the latest CapSense version is CapSense V7.0 and we recommend using this for new applications.

Best regards,
Hari

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