main.h

cypress的触摸按键模块介绍calibrating_capsense_with_the_csr_user_module___an2355_13.

#define A1 				0x40		// A1 = P1_6
#define A0 				0x08		// A0 = P1_3
#define I2CBASE			0x40		// I2C address = 0x86/0x86 with no pulldowns
#define LED_AUTO		0x04
#define NBUTTONS		8			// Number of buttons
#define	INT_PIN			0x10		// P1_4
#define INT_POL_MASK	0x02		// Control register, bit 1
#define INT_ENA_MASK	0x01		// Control register, bit 0
#define INT_STAT_MASK	0x80		// Control register, bit 7

struct I2C_RegType
{
	BYTE	Control;				// Control register
	BYTE	LEDs;					// LED On/Off register
	BYTE	Buttons;				// Button state
#ifdef debug
	int		adc[NBUTTONS];			// Button raw data
	int		baseline[NBUTTONS];		// Baseline data
	int		difference[NBUTTONS];   // Button differences
#endif
} I2Cregs;

BYTE dacCurrent[] = {44,42,36,35,32,30,34,38};	// Individual DAC current for switch 0 - 7
BYTE scanSpeed[]  = {30,29,25,14,10,10,12,13};	// Individual scan speed for switch 0 - 7
BYTE prev_buttons = 0;							// Keeps track of button press status

void Setup_IO(void)
{
	int i;
	
	//Make sure the LEDs are OFF
	PRT2DR 		 = 0xFF;
	I2Cregs.LEDs = 0x00;
	
	//ReConfigure I2C I/O.  Fixes Start-Up glitch by leaving IO
	//in tri-state on power-up, then switching to I2C mode
	PRT1DM2 |= 0xA0;
	PRT1DM1 |= 0xA0;
	PRT1DM0 |= 0xA0;
	
	//Set INT to default polarity (Active Low), ie no button pressed
	PRT1DR |= INT_PIN;
	
	//Set default INT values in control reg
	I2Cregs.Control = 0x00;
	I2Cregs.Control &= ~INT_ENA_MASK;	//Enable interrupt pin
										//Active low polarity
										//No interrupt pending
	
	//Set Pull-Ups for A1/A0, P1_6/P1_3
	PRT1DR |= 0x48;
}
 
void Setup_I2C(void)
{
	unsigned char PortData, I2Caddr, I2Cstatus;
	
	//Set up I2C address
	//Internal to PSoC, the address is right shifted by 1 bit
	//I2CBASE = b0100 0000
	//If A0 is pulled low on the chip, we set A0, 0000 0001
	//If A1 is pulled low on the chip, we set A1, 0000 0010
	//When no resistors are placed, the address is 0100 0011
	//This translates to b10000110 or 0x87R, 0x86W. Clear ??
	PRT1DR 	 |= (A1|A0);											//Turn on internal pull-ups for A1,A0 pins
	PortData  = PRT1DR;												//Read A1,A0 data from P1_6, P1_3
	I2Caddr	  = I2CBASE;
	I2Caddr	  = (PortData & A0) ? (I2Caddr|0x01) : I2Caddr;			//If A0 bit=1, OR address with 0x01
	I2Caddr	  = (PortData & A1) ? (I2Caddr|0x02) : I2Caddr;			//If A1 bit=1, OR address with 0x02	
	
	I2C_Start();													//Start I2C hardware
    I2C_SetAddr(I2Caddr);											//Set I2C address from strap pins

	I2C_SetRamBuffer(sizeof(I2Cregs), 6, (BYTE *) &I2Cregs);		//I2Cregs defined in main.h
	
	//Init the other reristers
	I2Cregs.Control |= LED_AUTO ;
	I2Cregs.Buttons = 0x00;
}

void Setup_Touch(void)
{
	SENSE_Start();

	SENSE_baBtnFThreshold[0] = 80;
	SENSE_baBtnFThreshold[1] = 100;
	SENSE_baBtnFThreshold[2] = 100;
	SENSE_baBtnFThreshold[3] = 90;
	SENSE_baBtnFThreshold[4] = 90;
	SENSE_baBtnFThreshold[5] = 100;
	SENSE_baBtnFThreshold[6] = 100;
	SENSE_baBtnFThreshold[7] = 100;	
}

BYTE Scan_Buttons()
{
	BYTE i,status;
	
	for( i=0; i < NBUTTONS; i++)										
    {
    	SENSE_SetDacCurrent(dacCurrent[i],SENSE_DAC_LOW);			//Set DAC current for this button
		SENSE_SetScanSpeed(scanSpeed[i]);							//Set scan speed for this button
       	SENSE_StartScan(i,1,SENSE_SCAN_ONCE);						//Scan the button
      	while(!(SENSE_GetScanStatus() & SENSE_SCAN_SET_COMPLETE));	//Wait until it's done
		#ifdef debug
			I2Cregs.adc[i] 	 	 = SENSE_iReadSwitch(i);
			I2Cregs.baseline[i]  = SENSE_iaSwBaseline[i];
			I2Cregs.difference[i]= SENSE_iaSwDiff[i];        	
		#endif	
	}
	status = SENSE_bUpdateBaseline(0);
	
	if(*SENSE_baSwOnMask!=prev_buttons) prev_buttons = *SENSE_baSwOnMask;
	
	return(status);
}

void Set_Interrupt_Pin()
{
	if(*SENSE_baSwOnMask!=prev_buttons)
	{
		if( !(I2Cregs.Control&INT_ENA_MASK) )
		{
			I2Cregs.Control |= INT_STAT_MASK;											//Set interrupt in register
			PRT1DR = (I2Cregs.Control&INT_POL_MASK)? PRT1DR|INT_PIN : PRT1DR&~INT_PIN;  //And set INT pin	
		}		
	}
	
	if (I2C_GetActivity() & I2C_READ_ACTIVITY)		//On I2C read
   	{
   		I2Cregs.Control &= ~INT_STAT_MASK;											//Clear control register status bit
		PRT1DR = (I2Cregs.Control&INT_POL_MASK)? PRT1DR&~INT_PIN : PRT1DR|INT_PIN;  //Clear INT pin	
   	}
}

void Set_LEDS()
{
	PRT2DR = *SENSE_baSwOnMask;
}