MPL3115A2 datasheet(12/44 Pages) FREESCALE

12 / 44 page

MPL3115A2

Sensors

Freescale Semiconductor, Inc.

Flow chart for Polling or Interrupt - No FIFO

Figure 5. Polling or Interrupt - No FIFO

Check for interrupt

on pin INT2

Poll data or use

interrupt INT2

Yes

Polling

/* Is SRC_DRDY Set */

(INT_S & 0x80) == TRUE

Service interrupt

and clear

Yes

Interrupt

/* Enable DRDY Interrupt*/

IIC_RegWrite(SlaveAddressIIC, 0x29, 0x80);

/* Set Active */

IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB9);

/* Enable Data Flags in PT_DATA_CFG */

IIC_RegWrite(SlaveAddressIIC, 0x13, 0x07);

/* I2C Address is 0xC0 */

SlaveAddressIIC = 0xC0

/* Set Active */

IIC _RegWrite(SlaveAddressIIC, 0x26, 0xB9);

/* Read STATUS Register */

STA = IIC _RegRead(SlaveAddressIIC, 0x00);

/* Is Data Ready */

(STA & 0x08) == TRUE

/* Read INT_SOURCE */

INT_S = IIC _RegRead(SlaveAddressIIC, 0x12);

/* Read OUT_P and OUT_T */

/* This clears the DRDY Interrupt */

OUT_P_MSB = IIC_RegRead(SlaveAddressIIC, 0x01);

OUT_P_CSB = IIC_RegRead(SlaveAddressIIC, 0x02);

OUT_P_LSB = IIC_RegRead(SlaveAddressIIC, 0x03);

OUT_T_MSB = IIC_RegRead(SlaveAddressIIC, 0x04);

OUT_T_LSB = IIC_RegRead(SlaveAddressIIC, 0x05);

Clear Interrupt

/* Read OUT_P and OUT_T */

/* This clears the DRDY Interrupt */

OUT_P_MSB = IIC_RegRead(SlaveAddressIIC, 0x01);

OUT_P_CSB = IIC_RegRead(SlaveAddressIIC, 0x02);

OUT_P_LSB = IIC_RegRead(SlaveAddressIIC, 0x03);

OUT_T_MSB = IIC_RegRead(SlaveAddressIIC, 0x04);

OUT_T_LSB = IIC_RegRead(SlaveAddressIIC, 0x05);

/* Set to Altimeter with an OSR = 128 */

IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB8);

/* Set INT to Active Low Open Drain */

IIC_RegWrite(SlaveAddressIIC, 0x28, 0x11);

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