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use super::Timeout;
/// Number of symbols used for channel activity detection scans.
///
/// Argument of [`CadParams::set_num_symbol`].
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(u8)]
pub enum NbCadSymbol {
/// 1 symbol.
S1 = 0x0,
/// 2 symbols.
S2 = 0x1,
/// 4 symbols.
S4 = 0x2,
/// 8 symbols.
S8 = 0x3,
/// 16 symbols.
S16 = 0x4,
}
/// Mode to enter after a channel activity detection scan is finished.
///
/// Argument of [`CadParams::set_exit_mode`].
#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(u8)]
pub enum ExitMode {
/// Standby with RC 13 MHz mode entry after CAD.
Standby = 0,
/// Standby with RC 13 MHz mode after CAD if no LoRa symbol is detected
/// during the CAD scan.
/// If a LoRa symbol is detected, the sub-GHz radio stays in RX mode
/// until a packet is received or until the CAD timeout is reached.
StandbyLoRa = 1,
}
/// Channel activity detection (CAD) parameters.
///
/// Argument of [`set_cad_params`].
///
/// # Recommended CAD settings
///
/// This is taken directly from the datasheet.
///
/// "The correct values selected in the table below must be carefully tested to
/// ensure a good detection at sensitivity level and to limit the number of
/// false detections"
///
/// | SF (Spreading Factor) | [`set_det_peak`] | [`set_det_min`] |
/// |-----------------------|------------------|-----------------|
/// | 5 | 0x18 | 0x10 |
/// | 6 | 0x19 | 0x10 |
/// | 7 | 0x20 | 0x10 |
/// | 8 | 0x21 | 0x10 |
/// | 9 | 0x22 | 0x10 |
/// | 10 | 0x23 | 0x10 |
/// | 11 | 0x24 | 0x10 |
/// | 12 | 0x25 | 0x10 |
///
/// [`set_cad_params`]: crate::subghz::SubGhz::set_cad_params
/// [`set_det_peak`]: crate::subghz::CadParams::set_det_peak
/// [`set_det_min`]: crate::subghz::CadParams::set_det_min
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct CadParams {
buf: [u8; 8],
}
impl CadParams {
/// Create a new `CadParams`.
///
/// This is the same as `default`, but in a `const` function.
///
/// # Example
///
/// ```
/// use stm32wlxx_hal::subghz::CadParams;
///
/// const CAD_PARAMS: CadParams = CadParams::new();
/// assert_eq!(CAD_PARAMS, CadParams::default());
/// ```
pub const fn new() -> CadParams {
CadParams {
buf: [super::OpCode::SetCadParams as u8, 0, 0, 0, 0, 0, 0, 0],
}
.set_num_symbol(NbCadSymbol::S1)
.set_det_peak(0x18)
.set_det_min(0x10)
.set_exit_mode(ExitMode::Standby)
}
/// Number of symbols used for a CAD scan.
///
/// # Example
///
/// Set the number of symbols to 4.
///
/// ```
/// use stm32wlxx_hal::subghz::{CadParams, NbCadSymbol};
///
/// const CAD_PARAMS: CadParams = CadParams::new().set_num_symbol(NbCadSymbol::S4);
/// # assert_eq!(CAD_PARAMS.as_slice()[1], 0x2);
/// ```
#[must_use = "set_num_symbol returns a modified CadParams"]
pub const fn set_num_symbol(mut self, nb: NbCadSymbol) -> CadParams {
self.buf[1] = nb as u8;
self
}
/// Used with [`set_det_min`] to correlate the LoRa symbol.
///
/// See the table in [`CadParams`] docs for recommended values.
///
/// # Example
///
/// Setting the recommended value for a spreading factor of 7.
///
/// ```
/// use stm32wlxx_hal::subghz::CadParams;
///
/// const CAD_PARAMS: CadParams = CadParams::new().set_det_peak(0x20).set_det_min(0x10);
/// # assert_eq!(CAD_PARAMS.as_slice()[2], 0x20);
/// # assert_eq!(CAD_PARAMS.as_slice()[3], 0x10);
/// ```
///
/// [`set_det_min`]: crate::subghz::CadParams::set_det_min
#[must_use = "set_det_peak returns a modified CadParams"]
pub const fn set_det_peak(mut self, peak: u8) -> CadParams {
self.buf[2] = peak;
self
}
/// Used with [`set_det_peak`] to correlate the LoRa symbol.
///
/// See the table in [`CadParams`] docs for recommended values.
///
/// # Example
///
/// Setting the recommended value for a spreading factor of 6.
///
/// ```
/// use stm32wlxx_hal::subghz::CadParams;
///
/// const CAD_PARAMS: CadParams = CadParams::new().set_det_peak(0x18).set_det_min(0x10);
/// # assert_eq!(CAD_PARAMS.as_slice()[2], 0x18);
/// # assert_eq!(CAD_PARAMS.as_slice()[3], 0x10);
/// ```
///
/// [`set_det_peak`]: crate::subghz::CadParams::set_det_peak
#[must_use = "set_det_min returns a modified CadParams"]
pub const fn set_det_min(mut self, min: u8) -> CadParams {
self.buf[3] = min;
self
}
/// Mode to enter after a channel activity detection scan is finished.
///
/// # Example
///
/// ```
/// use stm32wlxx_hal::subghz::{CadParams, ExitMode};
///
/// const CAD_PARAMS: CadParams = CadParams::new().set_exit_mode(ExitMode::Standby);
/// # assert_eq!(CAD_PARAMS.as_slice()[4], 0x00);
/// # assert_eq!(CAD_PARAMS.set_exit_mode(ExitMode::StandbyLoRa).as_slice()[4], 0x01);
/// ```
#[must_use = "set_exit_mode returns a modified CadParams"]
pub const fn set_exit_mode(mut self, mode: ExitMode) -> CadParams {
self.buf[4] = mode as u8;
self
}
/// Set the timeout.
///
/// This is only used with [`ExitMode::StandbyLoRa`].
///
/// # Example
///
/// ```
/// use stm32wlxx_hal::subghz::{CadParams, ExitMode, Timeout};
///
/// const TIMEOUT: Timeout = Timeout::from_raw(0x123456);
/// const CAD_PARAMS: CadParams = CadParams::new()
/// .set_exit_mode(ExitMode::StandbyLoRa)
/// .set_timeout(TIMEOUT);
/// # assert_eq!(CAD_PARAMS.as_slice()[4], 0x01);
/// # assert_eq!(CAD_PARAMS.as_slice()[5], 0x12);
/// # assert_eq!(CAD_PARAMS.as_slice()[6], 0x34);
/// # assert_eq!(CAD_PARAMS.as_slice()[7], 0x56);
/// ```
#[must_use = "set_timeout returns a modified CadParams"]
pub const fn set_timeout(mut self, to: Timeout) -> CadParams {
let to_bytes: [u8; 3] = to.as_bytes();
self.buf[5] = to_bytes[0];
self.buf[6] = to_bytes[1];
self.buf[7] = to_bytes[2];
self
}
/// Extracts a slice containing the packet.
///
/// # Example
///
/// ```
/// use stm32wlxx_hal::subghz::{CadParams, ExitMode, NbCadSymbol, Timeout};
///
/// const TIMEOUT: Timeout = Timeout::from_raw(0x123456);
/// const CAD_PARAMS: CadParams = CadParams::new()
/// .set_num_symbol(NbCadSymbol::S4)
/// .set_det_peak(0x18)
/// .set_det_min(0x10)
/// .set_exit_mode(ExitMode::StandbyLoRa)
/// .set_timeout(TIMEOUT);
///
/// assert_eq!(
/// CAD_PARAMS.as_slice(),
/// &[0x88, 0x02, 0x18, 0x10, 0x01, 0x12, 0x34, 0x56]
/// );
/// ```
pub const fn as_slice(&self) -> &[u8] {
&self.buf
}
}
impl Default for CadParams {
fn default() -> Self {
Self::new()
}
}