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rust: Test PLL computation against output of C implementation

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This commit is contained in:
Wladimir J. van der Laan 2019-08-21 13:56:26 +00:00
parent eab9d94a1b
commit 37cf4ad5a2
2 changed files with 18 additions and 2 deletions
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1
rust/k210-shared/src/lib.rs
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@ -4,6 +4,7 @@
#![no_std]
pub mod board;
#[cfg(not(test))]
pub mod panic;
pub mod soc;
mod util;

19
rust/k210-shared/src/soc/sysctl/pll_compute.rs
View File

@ -2,6 +2,7 @@ use core::convert::TryInto;
use libm::F64Ext;
/** PLL configuration */
#[derive(Debug, PartialEq, Eq)]
pub struct Params {
pub clkr: u8,
pub clkf: u8,
@ -44,7 +45,7 @@ pub fn compute_params(freq_in: u32, freq_out: u32) -> Option<Params> {
// Parameters to be exported from the loop
let mut found: Option<Params> = None;
for nfi in (val as i32)..NF_MAX {
let nr: i32 = ((nfi as f64) / val) as i32;
let nr: i32 = ((nfi as f64) / val).round() as i32;
if nr == 0 {
continue;
}
@ -171,4 +172,18 @@ pub fn compute_params(freq_in: u32, freq_out: u32) -> Option<Params> {
}
}
// TODO: add tests
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_ompute_params() {
/* check against output of C implementation */
assert_eq!(compute_params(26_000_000, 1_500_000_000), Some(Params { clkr: 0, clkf: 57, clkod: 0, bwadj: 57 }));
assert_eq!(compute_params(26_000_000, 1_000_000_000), Some(Params { clkr: 0, clkf: 37, clkod: 0, bwadj: 37 }));
assert_eq!(compute_params(26_000_000, 800_000_000), Some(Params { clkr: 0, clkf: 61, clkod: 1, bwadj: 61 }));
assert_eq!(compute_params(26_000_000, 700_000_000), Some(Params { clkr: 0, clkf: 53, clkod: 1, bwadj: 53 }));
assert_eq!(compute_params(26_000_000, 300_000_000), Some(Params { clkr: 0, clkf: 45, clkod: 3, bwadj: 45 }));
assert_eq!(compute_params(26_000_000, 45_158_400), Some(Params { clkr: 0, clkf: 25, clkod: 14, bwadj: 25 }));
}
}