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.
schematics
Pin list
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
