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|
/// RF frequency structure.
///
/// Argument of [`set_rf_frequency`].
///
/// [`set_rf_frequency`]: super::SubGhz::set_rf_frequency
#[derive(Debug, PartialEq, Eq, Clone, Copy, PartialOrd, Ord)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct RfFreq {
buf: [u8; 5],
}
impl RfFreq {
/// 915MHz, often used in Australia and North America.
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// assert_eq!(RfFreq::F915.freq(), 915_000_000);
/// ```
pub const F915: RfFreq = RfFreq::from_raw(0x39_30_00_00);
/// 868MHz, often used in Europe.
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// assert_eq!(RfFreq::F868.freq(), 868_000_000);
/// ```
pub const F868: RfFreq = RfFreq::from_raw(0x36_40_00_00);
/// 433MHz, often used in Europe.
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// assert_eq!(RfFreq::F433.freq(), 433_000_000);
/// ```
pub const F433: RfFreq = RfFreq::from_raw(0x1B_10_00_00);
/// Create a new `RfFreq` from a raw bit value.
///
/// The equation used to get the PLL frequency from the raw bits is:
///
/// RF<sub>PLL</sub> = 32e6 × bits / 2<sup>25</sup>
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// const FREQ: RfFreq = RfFreq::from_raw(0x39300000);
/// assert_eq!(FREQ, RfFreq::F915);
/// ```
pub const fn from_raw(bits: u32) -> RfFreq {
RfFreq {
buf: [
super::OpCode::SetRfFrequency as u8,
((bits >> 24) & 0xFF) as u8,
((bits >> 16) & 0xFF) as u8,
((bits >> 8) & 0xFF) as u8,
(bits & 0xFF) as u8,
],
}
}
/// Create a new `RfFreq` from a PLL frequency.
///
/// The equation used to get the raw bits from the PLL frequency is:
///
/// bits = RF<sub>PLL</sub> * 2<sup>25</sup> / 32e6
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// const FREQ: RfFreq = RfFreq::from_frequency(915_000_000);
/// assert_eq!(FREQ, RfFreq::F915);
/// ```
pub const fn from_frequency(freq: u32) -> RfFreq {
Self::from_raw((((freq as u64) * (1 << 25)) / 32_000_000) as u32)
}
// Get the frequency bit value.
const fn as_bits(&self) -> u32 {
((self.buf[1] as u32) << 24)
| ((self.buf[2] as u32) << 16)
| ((self.buf[3] as u32) << 8)
| (self.buf[4] as u32)
}
/// Get the actual frequency.
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// assert_eq!(RfFreq::from_raw(0x39300000).freq(), 915_000_000);
/// ```
pub fn freq(&self) -> u32 {
(32_000_000 * (self.as_bits() as u64) / (1 << 25)) as u32
}
/// Extracts a slice containing the packet.
///
/// # Example
///
/// ```
/// use stm32wl_hal::subghz::RfFreq;
///
/// assert_eq!(RfFreq::F915.as_slice(), &[0x86, 0x39, 0x30, 0x00, 0x00]);
/// ```
pub const fn as_slice(&self) -> &[u8] {
&self.buf
}
}
#[cfg(test)]
mod test {
use super::RfFreq;
#[test]
fn max() {
assert_eq!(RfFreq::from_raw(u32::MAX).freq(), 4_095_999_999);
}
#[test]
fn min() {
assert_eq!(RfFreq::from_raw(u32::MIN).freq(), 0);
}
}
|
