I C Precision Altimeter - Farnell

Flow chart for FIFO setup
/* I2C Address is 0xC0 */
SlaveAddressIIC = 0xC0
/* Set INT to Active Low Open Drain */
IIC_RegWrite(SlaveAddressIIC, 0x28, 0x11);
/* Set to Altimeter with an OSR = 128 */
IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB8);
/* Enable FIFO Interrupt */
IIC_RegWrite(SlaveAddressIIC, 0x29, 0x40);
/* Enable Data Flags in PT_DATA_CFG */
IIC_RegWrite(SlaveAddressIIC, 0x13, 0x07);
/* Set INT to Active Low Open Drain */
IIC_RegWrite(SlaveAddressIIC, 0x28, 0x11);
/* Set Active */
IIC_RegWrite(SlaveAddressIIC, 0x26, 0xB9);
/* Enable FIFO with a Watermark of 10 */
IIC_RegWrite(SlaveAddressIIC, 0x0F, 0x4A);
No
Check for interrupt
on pin INT2
Yes
/* Read INT_SOURCE */
INT_S = IIC_RegRead(SlaveAddressIIC, 0x12);
Service interrupt
and clear
No
/* Is SRC_FIFO Set */
(INT_S & 0x40) == TRUE
/* Read FIFO status, this clears the INT */
F_S = IIC_RegRead(SlaveAddressIIC, 0x0D);
No
/* Is F_WMRK_FLAG Set */
(F_S & 0x40) == TRUE
Yes
/* Dump FIFO with a multi byte I2C read */
IIC_RegReadN(SlaveAddressIIC, 0x01, 32, &fifo_data[0].Sample.BT.b_msb);
Figure 6. FIFO Setup
MPL3115A2
Sensors
Freescale Semiconductor, Inc. 13