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I need to stream serial data out of a hardware SPI module. This SPI module accepts 16-bit words and transmits them MSB first.

To feed the SPI module, I have prepared an array of 16-bit integers.

Here's the tricky part: the data that I'm going to be streaming out of the SPI module is not constructed from 16-bit wide words. Instead, 588 bits in 68 codewords need to be output as follows:

The first word, codeIndex=0, is 24 bits wide Every other word (codeIndex=x for all odd numbers x) is 3 bits wide All remaining codewords (codeIndex=x for all nonzero even numbers) is 14 bits wide

The SPI interface must stream out all of these code words in sequence with no added or missing bits. That means that the first 16-bit word that I send to the SPI interface needs to be the most significant 16 bits of the 24 bit codeIndex=0, and the next 16-bit word would be the remaining eight bits of codeIndex=0 followed by all three bits of codeIndex=1 followed by the most significant five bits of codeIndex=2, and the next 16-bit word sent to the SPI interface would finish off codeIndex=2 and so on.

I've come up with an approach for this that makes heavy use of binary OR operators and bitwise shifts, but it seems like there should be a faster way to do this by manipulating pointers or something.

My approach makes use of a lookup table. Each row of the lookup table defines a 16-bit word in terms of how many irregular codewords appear in it, which codewords appear in it, and the bitwise offsets that must be applied to those codewords before their ones are OR'd into the 16-bit word. Because 588 bits fills exactly 36.75 16-bit words, I've made this table four iterations long to perfectly fill 147 16-bit words. You can see in the code below that I have unrolled some loops in the program to try and speed it up further.

Is there a way to set inline breakpoints (with a plugin) in the Eclipse IDE?

For example when multiple methods are called in the same line, is there a way to set a breakpoint for a specific method call in that line and not for the complete line?