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low_rate_optimize

pamoja_radios::sx1302::channel

Function low_rate_optimize 

Source 
pub const fn low_rate_optimize(spreading_factor: u8, bandwidth_hz: u32) -> bool
Expand description

Whether a rate is slow enough to need the low data rate optimization.

A symbol that lasts long enough drifts against the receiver clock before it ends, and the two ends have to agree to carry fewer bits in it. Which rates those are depends on the bandwidth as well as the spreading factor.

§Arguments

  • spreading_factor - the spreading factor.
  • bandwidth_hz - the bandwidth, in hertz.

§Returns

Whether the optimization is on for that pair.

§Examples

use pamoja_radios::sx1302::channel::low_rate_optimize;

assert!(low_rate_optimize(11, 125_000));
assert!(low_rate_optimize(12, 125_000));
assert!(!low_rate_optimize(10, 125_000));

// The same spreading factor twice as wide halves the symbol, so it is only on at SF12.
assert!(!low_rate_optimize(11, 250_000));
assert!(low_rate_optimize(12, 250_000));
assert!(!low_rate_optimize(12, 500_000));