MPL3115A2 datasheet(13/44 Pages) FREESCALE

13 / 44 page

MPL3115A2

Sensors

Freescale Semiconductor, Inc.

Flow chart for FIFO setup

Figure 6. FIFO Setup

Service interrupt

and clear

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

IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB8);

/* Set INT to Active Low Open Drain */

IIC_RegWrite(SlaveAddressIIC, 0x28, 0x11);

/* Enable Data Flags in PT_DATA_CFG */

IIC_RegWrite(SlaveAddressIIC, 0x13, 0x07);

/* I2C Address is 0xC0 */

SlaveAddressIIC = 0xC0

/* Enable FIFO with a Watermark of 10 */

IIC_RegWrite(SlaveAddressIIC, 0x0F, 0x4A);

/* Dump FIFO with a multi byte I2C read */

IIC _RegReadN(SlaveAddressIIC, 0x01, 32, &fifo_data[0].Sample.BT.b_msb);

Check for interrupt

on pin INT2

/* Is SRC_FIFO Set */

(INT_S & 0x40) == TRUE

Yes

/* Enable FIFO Interrupt */

IIC _RegWrite(SlaveAddressIIC, 0x29, 0x40);

/* Set Active */

IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB9);

/* Read INT_SOURCE */

INT_S = IIC_RegRead(SlaveAddressIIC, 0x12);

/* Set INT to Active Low Open Drain */

IIC _RegWrite(SlaveAddressIIC, 0x28, 0x11);

/* Read FIFO status, this clears the INT */

F_S = IIC _RegRead(SlaveAddressIIC, 0x0D);

/* Is F_WMRK_FLAG Set */

(F_S & 0x40) == TRUE

Yes

MPL3115A2 데이터시트(PDF) 13 Page - Freescale Semiconductor, Inc