Math and Logic¶
Description¶
Basic mathematical and logical operations
This resource provides basic operations not supported by the programming language itself. This includes:
- Increment a variable, saturating at a specified value
- Increment a variable, wrapping to 0 at a specified value
- Swap endianess in a 16-bit variable (8 lsbs and 8 msbs are swapped)
Examples¶
Endianess Conversion and Ring Buffer Position Update¶
// Read the sensor value, LSB first and then MSB in a 16-bit SPI RX operation
U16 temp;
spiBegin(SPI_POL0_PHA0, AUXIO_SPI_CSN_SENSOR);
spiTx8bit(SPI_POL0_PHA0, 0x42);
spiRx16bit(SPI_POL0_PHA0; temp);
spiEnd(SPI_POL0_PHA0, AUXIO_SPI_CSN_SENSOR);
// Swap endianess, store to the ring buffer and increment the ring buffer position
U16 n = state.bufferPos;
utilSwapEndianess(temp; output.pBuffer[n]);
utilIncrAndWrap(n, BUFFER_SIZE; state.bufferPos);
Histogram Update¶
U16 value = ...;
// Find the correct histogram bin counter
U16* pBinCounter;
if (value > 1000) {
pBinCounter = #output.highCount;
} else {
pBinCounter = #output.lowCount;
}
// Increment the histogram bin counter, saturating at 50000
utilIncrAndSat(*pBinCounter, 50000; *pBinCounter);
Procedures Overview¶
| Name | Brief description |
utilIncrAndSat() |
Increments a variable, saturating at the specified value More … |
utilIncrAndWrap() |
Increments a variable, wrapping to 0 at the specified value. More … |
utilSwapEndianess() |
Swaps the most and least significant bytes in a variable. More … |
Constants¶
None.
Global Variables¶
None.
Procedures¶
utilIncrAndSat¶
Prototype: utilIncrAndSat(value, #sat; incrValue)
Increments a variable, saturating at the specified value
Parameter value(s)¶
- value : Initial value
- #sat : Saturation value
Return value(s)¶
- incrValue : Incremented value