Constant dma_gpio::pi::NUM_CBS

pub const NUM_CBS: usize

= NUM_SAMPLES * 2 = 400. Number of Control Blocks.

This is how much memory that will be allocated for control blocks. Setting a different number for cycle time (BoardBuilder::set_cycle_time) and setting a different number of sample delay (BoardBuilder::set_sample_delay) will still allocate memory for 400 control blocks, but will only initialize (cycle_time/sample_delay) control blocks.