swaitsandClaude Opus 4.6
3102fc747a
Implement full SSD1306 OLED display support: - Splash screen on boot (1.5s) with project name, version, board - Dashboard showing radio state, config, counters, RSSI/SNR - RSSI history sparkline (64-sample ring buffer, 2px-wide bars) - DisplayOn/DisplayOff host commands routed via dedicated channel - Pure render functions against generic DrawTarget (no hardware coupling) - Display on/off control bypasses radio task entirely Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
//! log base 2 approximation for a single-precision float.
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use super::F32;
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use core::f32::consts::LOG10_E;
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impl F32 {
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/// Approximates the base 10 logarithm of the number.
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pub fn log10(self) -> Self {
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self.ln() * LOG10_E
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}
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}
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#[cfg(test)]
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mod tests {
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use super::F32;
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pub(crate) const MAX_ERROR: f32 = 0.001;
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/// log10(x) test vectors - `(input, output)`
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pub(crate) const TEST_VECTORS: &[(f32, f32)] = &[
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(1e-20, -20.0),
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(1e-19, -19.0),
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(1e-18, -18.0),
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(1e-17, -17.0),
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(1e-16, -16.0),
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(1e-15, -15.0),
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(1e-14, -14.0),
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(1e-13, -13.0),
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(1e-12, -12.0),
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(1e-11, -11.0),
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(1e-10, -10.0),
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(1e-09, -9.0),
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(1e-08, -8.0),
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(1e-07, -7.0),
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(1e-06, -6.0),
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(1e-05, -5.0),
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(1e-04, -4.0),
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(0.001, -3.0),
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(0.01, -2.0),
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(0.1, -1.0),
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(10.0, 1.0),
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(100.0, 2.0),
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(1000.0, 3.0),
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(10000.0, 4.0),
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(100000.0, 5.0),
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(1000000.0, 6.0),
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(10000000.0, 7.0),
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(100000000.0, 8.0),
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(1000000000.0, 9.0),
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(10000000000.0, 10.0),
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(100000000000.0, 11.0),
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(1000000000000.0, 12.0),
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(10000000000000.0, 13.0),
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(100000000000000.0, 14.0),
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(1000000000000000.0, 15.0),
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(1e+16, 16.0),
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(1e+17, 17.0),
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(1e+18, 18.0),
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(1e+19, 19.0),
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];
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#[test]
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fn sanity_check() {
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assert_eq!(F32::ONE.log10(), F32::ZERO);
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for &(x, expected) in TEST_VECTORS {
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let ln_x = F32(x).log10();
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let relative_error = (ln_x - expected).abs() / expected;
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assert!(
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relative_error <= MAX_ERROR,
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"relative_error {} too large: {} vs {}",
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relative_error,
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ln_x,
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expected
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);
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}
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}
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}
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