Add HAL for SubGhz peripheral for STM32 WL series

Based on the HAL from stm32wl, the peripheral driver has been
modified to fit into embassy, using the embassy APIs, providing
operation of the radio peripheral.

The initial version does not offer any async APIs, but the example
shows how the radio IRQ can be used to perform async TX of the radio.

examples/stm32wl55/Cargo.toml

@@ -19,7 +19,7 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32wl55jc_cm4", "time-driver-tim2", "memory-x"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32wl55jc_cm4", "time-driver-tim2", "memory-x", "subghz"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
 
 defmt = "0.2.0"

examples/stm32wl55/src/bin/subghz.rs

@@ -0,0 +1,129 @@
+#![no_std]
+#![no_main]
+#![macro_use]
+#![allow(dead_code)]
+#![feature(generic_associated_types)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use embassy::{traits::gpio::WaitForRisingEdge, util::InterruptFuture};
+use embassy_stm32::{
+    dbgmcu::Dbgmcu,
+    dma::NoDma,
+    exti::ExtiInput,
+    gpio::{Input, Level, Output, Pull, Speed},
+    interrupt,
+    subghz::*,
+    Peripherals,
+};
+use embedded_hal::digital::v2::OutputPin;
+use example_common::unwrap;
+
+const PING_DATA: &str = "PING";
+const DATA_LEN: u8 = PING_DATA.len() as u8;
+const PING_DATA_BYTES: &[u8] = PING_DATA.as_bytes();
+const PREAMBLE_LEN: u16 = 5 * 8;
+
+const RF_FREQ: RfFreq = RfFreq::from_frequency(867_500_000);
+
+const SYNC_WORD: [u8; 8] = [0x79, 0x80, 0x0C, 0xC0, 0x29, 0x95, 0xF8, 0x4A];
+const SYNC_WORD_LEN: u8 = SYNC_WORD.len() as u8;
+const SYNC_WORD_LEN_BITS: u8 = SYNC_WORD_LEN * 8;
+
+const TX_BUF_OFFSET: u8 = 128;
+const RX_BUF_OFFSET: u8 = 0;
+const LORA_PACKET_PARAMS: LoRaPacketParams = LoRaPacketParams::new()
+    .set_crc_en(true)
+    .set_preamble_len(PREAMBLE_LEN)
+    .set_payload_len(DATA_LEN)
+    .set_invert_iq(false)
+    .set_header_type(HeaderType::Fixed);
+
+const LORA_MOD_PARAMS: LoRaModParams = LoRaModParams::new()
+    .set_bw(LoRaBandwidth::Bw125)
+    .set_cr(CodingRate::Cr45)
+    .set_ldro_en(true)
+    .set_sf(SpreadingFactor::Sf7);
+
+// configuration for +10 dBm output power
+// see table 35 "PA optimal setting and operating modes"
+const PA_CONFIG: PaConfig = PaConfig::new()
+    .set_pa_duty_cycle(0x1)
+    .set_hp_max(0x0)
+    .set_pa(PaSel::Lp);
+
+const TCXO_MODE: TcxoMode = TcxoMode::new()
+    .set_txco_trim(TcxoTrim::Volts1pt7)
+    .set_timeout(Timeout::from_duration_sat(
+        core::time::Duration::from_millis(10),
+    ));
+
+const TX_PARAMS: TxParams = TxParams::new()
+    .set_power(0x0D)
+    .set_ramp_time(RampTime::Micros40);
+
+fn config() -> embassy_stm32::Config {
+    let mut config = embassy_stm32::Config::default();
+    config.rcc = config.rcc.clock_src(embassy_stm32::rcc::ClockSrc::HSE32);
+    config
+}
+
+#[embassy::main(config = "config()")]
+async fn main(_spawner: embassy::executor::Spawner, p: Peripherals) {
+    unsafe {
+        Dbgmcu::enable_all();
+    }
+
+    let mut led1 = Output::new(p.PB15, Level::High, Speed::Low);
+    let mut led2 = Output::new(p.PB9, Level::Low, Speed::Low);
+    let mut led3 = Output::new(p.PB11, Level::Low, Speed::Low);
+
+    let button = Input::new(p.PA0, Pull::Up);
+    let mut pin = ExtiInput::new(button, p.EXTI0);
+
+    let mut radio_irq = interrupt::take!(SUBGHZ_RADIO);
+    let mut radio = SubGhz::new(p.SUBGHZSPI, p.PA5, p.PA7, p.PA6, NoDma, NoDma);
+
+    defmt::info!("Radio ready for use");
+
+    unwrap!(led1.set_low());
+
+    unwrap!(led2.set_high());
+
+    unwrap!(radio.set_standby(StandbyClk::Rc));
+    unwrap!(radio.set_tcxo_mode(&TCXO_MODE));
+    unwrap!(radio.set_standby(StandbyClk::Hse));
+    unwrap!(radio.set_regulator_mode(RegMode::Ldo));
+    unwrap!(radio.set_buffer_base_address(TX_BUF_OFFSET, RX_BUF_OFFSET));
+    unwrap!(radio.set_pa_config(&PA_CONFIG));
+    unwrap!(radio.set_pa_ocp(Ocp::Max60m));
+    unwrap!(radio.set_tx_params(&TX_PARAMS));
+    unwrap!(radio.set_packet_type(PacketType::LoRa));
+    unwrap!(radio.set_lora_sync_word(LoRaSyncWord::Public));
+    unwrap!(radio.set_lora_mod_params(&LORA_MOD_PARAMS));
+    unwrap!(radio.set_lora_packet_params(&LORA_PACKET_PARAMS));
+    unwrap!(radio.calibrate_image(CalibrateImage::ISM_863_870));
+    unwrap!(radio.set_rf_frequency(&RF_FREQ));
+
+    defmt::info!("Status: {:?}", unwrap!(radio.status()));
+
+    unwrap!(led2.set_low());
+
+    loop {
+        pin.wait_for_rising_edge().await;
+        unwrap!(led3.set_high());
+        unwrap!(radio.set_irq_cfg(&CfgIrq::new().irq_enable_all(Irq::TxDone)));
+        unwrap!(radio.write_buffer(TX_BUF_OFFSET, PING_DATA_BYTES));
+        unwrap!(radio.set_tx(Timeout::DISABLED));
+
+        InterruptFuture::new(&mut radio_irq).await;
+        let (_, irq_status) = unwrap!(radio.irq_status());
+        if irq_status & Irq::TxDone.mask() != 0 {
+            defmt::info!("TX done");
+        }
+        unwrap!(radio.clear_irq_status(irq_status));
+        unwrap!(led3.set_low());
+    }
+}