OSDev.org

Here is why I am asking: I have an ambient pressure (altitude) sensor that is malfunctioning from time to time. I communicate with the sensor from a Freescale Microcontroller (MCF52223) using SPI, well Motorolla/Freescale/Google's version of SPI - QSPI. There are two 16 bit integers I read to create a 32 bit integer which I then run through an equation to calculate ambient pressure. Generally the data comes in fine, but once in a blue moon the two integers I read in are 0x100 and 0xFEFF which turns into 0x100FEFF, and is not the correct data.