N40P112 datasheet(10/34 Pages) AMSCO

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N40P112 Datasheet(PDF) 10 Page - ams AG

Part #	N40P112

Description	Push button feature

Download	34 Pages

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Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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N40P112 Datasheet(HTML) 10 Page - ams AG

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EasyPoint

TM N40P112

Datasheet - Using the N40P112 M odule

www.austriamicrosystems.com/N40P112

Revision 1.1

10 - 34

8.3 C Source Code Example

8.3.1 Initialization

void EasyPoint_init (void)

{

unsigned char Reset_status = 0;

RESETn = 0;Delay_ms(1);// RESETn pulse after power up

RESETn = 1; Delay_ms(1);

while (Reset_status != 0xF0)// Check the reset has been done

{

Reset_status = I2C_Read8(0x40, 0x0F) & 0xFE;

}

I2C_Write8(0x40, 0x2d, 0x0D); // Scaling factor for N40 (1.0mm knob travel)

}

8.3.2 Offset Calibration

void Offset_Calibrate (void)

{

char i;

int x_cal=0, y_cal=0;

EA = 0;// Disable the MCU interrupts

I2C_Write8(0x40, 0x0F, 0x00);// Low Power Mode 20ms

Delay_ms(1);

I2C_Read8(0x40, 0x11); // Flush an unused Y_reg to reset the interrupt

for (i=0; i<16; i++)// Read 16 times the coordinates and then average

{

while (INTn);// Wait until next interrupt (new coordinates)

x_cal += (signed char) I2C_Read8(0x40, 0x10); // Read X position

y_cal += (signed char) I2C_Read8(0x40, 0x11); // Read Y position

}

// offset_X and offset_Y are global variables, used for each coordinate readout

in the interrupt routine

offset_X = -(x_cal>>4); // Average X: divide by 16

offset_Y = -(y_cal>>4); // Average Y: divide by 16

EA = 1; // Enable the MCU interrupts

}

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