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>
34 lines
885 B
Rust
34 lines
885 B
Rust
//! Returns a number that represents the sign of `self`.
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use super::F32;
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impl F32 {
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/// Returns a number that represents the sign of `self`.
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///
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/// * `1.0` if the number is positive, `+0.0` or `INFINITY`
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/// * `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
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/// * `NAN` if the number is `NAN`
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pub fn signum(self) -> Self {
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if self.is_nan() {
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Self::NAN
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} else {
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F32(1.0).copysign(self)
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}
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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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#[test]
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fn sanity_check() {
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assert_eq!(F32::INFINITY.signum(), F32(1.0));
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assert_eq!(F32(0.0).signum(), F32(1.0));
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assert_eq!(F32(1.0).signum(), F32(1.0));
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assert_eq!(F32::NEG_INFINITY.signum(), F32(-1.0));
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assert_eq!(F32(-0.0).signum(), F32(-1.0));
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assert_eq!(F32(-1.0).signum(), F32(-1.0));
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}
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}
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