add SAI example

1 files changed, 189 insertions, 0 deletions

diff --git a/examples/stm32h7/src/bin/sai.rs b/examples/stm32h7/src/bin/sai.rs
new file mode 100644
index 000000000..ef8479979
--- /dev/null
+++ b/examples/stm32h7/src/bin/sai.rs
@@ -0,0 +1,189 @@
+//! Daisy Seed rev.7(with PCM3060 codec)
+//! https://electro-smith.com/products/daisy-seed
+#![no_std]
+#![no_main]
+
+use defmt_rtt as _;
+use embassy_executor::Spawner;
+use embassy_stm32 as hal;
+use grounded::uninit::GroundedArrayCell;
+use hal::rcc::*;
+use hal::sai::*;
+use hal::time::Hertz;
+use panic_probe as _;
+
+const BLOCK_LENGTH: usize = 32; // 32 samples
+const HALF_DMA_BUFFER_LENGTH: usize = BLOCK_LENGTH * 2; //  2 channels
+const DMA_BUFFER_LENGTH: usize = HALF_DMA_BUFFER_LENGTH * 2; //  2 half-blocks
+const SAMPLE_RATE: u32 = 48000;
+
+//DMA buffer must be in special region. Refer https://embassy.dev/book/#_stm32_bdma_only_working_out_of_some_ram_regions
+#[link_section = ".sram1_bss"]
+static mut TX_BUFFER: GroundedArrayCell<u32, DMA_BUFFER_LENGTH> = GroundedArrayCell::uninit();
+#[link_section = ".sram1_bss"]
+static mut RX_BUFFER: GroundedArrayCell<u32, DMA_BUFFER_LENGTH> = GroundedArrayCell::uninit();
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut config = hal::Config::default();
+    config.rcc.pll1 = Some(Pll {
+        source: PllSource::HSE,
+        prediv: PllPreDiv::DIV4,
+        mul: PllMul::MUL200,
+        divp: Some(PllDiv::DIV2),
+        divq: Some(PllDiv::DIV5),
+        divr: Some(PllDiv::DIV2),
+    });
+    config.rcc.pll3 = Some(Pll {
+        source: PllSource::HSE,
+        prediv: PllPreDiv::DIV6,
+        mul: PllMul::MUL295,
+        divp: Some(PllDiv::DIV16),
+        divq: Some(PllDiv::DIV4),
+        divr: Some(PllDiv::DIV32),
+    });
+    config.rcc.sys = Sysclk::PLL1_P;
+    config.rcc.mux.sai1sel = hal::pac::rcc::vals::Saisel::PLL3_P;
+    config.rcc.ahb_pre = AHBPrescaler::DIV2; // 200 Mhz
+    config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
+    config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
+    config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
+    config.rcc.apb4_pre = APBPrescaler::DIV2; // 100 Mhz
+    config.rcc.hse = Some(Hse {
+        freq: Hertz::mhz(16),
+        mode: HseMode::Oscillator,
+    });
+
+    let p = hal::init(config);
+
+    let (sub_block_tx, sub_block_rx) = hal::sai::split_subblocks(p.SAI1);
+    let kernel_clock = hal::rcc::frequency::<hal::peripherals::SAI1>().0;
+    let mclk_div = mclk_div_from_u8((kernel_clock / (SAMPLE_RATE * 256)) as u8);
+
+    let mut tx_config = hal::sai::Config::default();
+    tx_config.mode = Mode::Master;
+    tx_config.tx_rx = TxRx::Transmitter;
+    tx_config.sync_output = true;
+    tx_config.clock_strobe = ClockStrobe::Falling;
+    tx_config.master_clock_divider = mclk_div;
+    tx_config.stereo_mono = StereoMono::Stereo;
+    tx_config.data_size = DataSize::Data24;
+    tx_config.bit_order = BitOrder::MsbFirst;
+    tx_config.frame_sync_polarity = FrameSyncPolarity::ActiveHigh;
+    tx_config.frame_sync_offset = FrameSyncOffset::OnFirstBit;
+    tx_config.frame_length = 64;
+    tx_config.frame_sync_active_level_length = embassy_stm32::sai::word::U7(32);
+    tx_config.fifo_threshold = FifoThreshold::Quarter;
+
+    let mut rx_config = tx_config.clone();
+    rx_config.mode = Mode::Slave;
+    rx_config.tx_rx = TxRx::Receiver;
+    rx_config.sync_input = SyncInput::Internal;
+    rx_config.clock_strobe = ClockStrobe::Rising;
+    rx_config.sync_output = false;
+
+    let tx_buffer: &mut [u32] = unsafe {
+        TX_BUFFER.initialize_all_copied(0);
+        let (ptr, len) = TX_BUFFER.get_ptr_len();
+        core::slice::from_raw_parts_mut(ptr, len)
+    };
+
+    let mut sai_transmitter = Sai::new_asynchronous_with_mclk(
+        sub_block_tx,
+        p.PE5,
+        p.PE6,
+        p.PE4,
+        p.PE2,
+        p.DMA1_CH0,
+        tx_buffer,
+        tx_config,
+    );
+
+    let rx_buffer: &mut [u32] = unsafe {
+        RX_BUFFER.initialize_all_copied(0);
+        let (ptr, len) = RX_BUFFER.get_ptr_len();
+        core::slice::from_raw_parts_mut(ptr, len)
+    };
+
+    let mut sai_receiver =
+        Sai::new_synchronous(sub_block_rx, p.PE3, p.DMA1_CH1, rx_buffer, rx_config);
+
+    sai_receiver.start();
+    sai_transmitter.start();
+
+    let mut buf = [0u32; HALF_DMA_BUFFER_LENGTH];
+
+    loop {
+        sai_receiver.read(&mut buf).await.unwrap();
+        sai_transmitter.write(&buf).await.unwrap();
+    }
+}
+
+const fn mclk_div_from_u8(v: u8) -> MasterClockDivider {
+    match v {
+        1 => MasterClockDivider::Div1,
+        2 => MasterClockDivider::Div2,
+        3 => MasterClockDivider::Div3,
+        4 => MasterClockDivider::Div4,
+        5 => MasterClockDivider::Div5,
+        6 => MasterClockDivider::Div6,
+        7 => MasterClockDivider::Div7,
+        8 => MasterClockDivider::Div8,
+        9 => MasterClockDivider::Div9,
+        10 => MasterClockDivider::Div10,
+        11 => MasterClockDivider::Div11,
+        12 => MasterClockDivider::Div12,
+        13 => MasterClockDivider::Div13,
+        14 => MasterClockDivider::Div14,
+        15 => MasterClockDivider::Div15,
+        16 => MasterClockDivider::Div16,
+        17 => MasterClockDivider::Div17,
+        18 => MasterClockDivider::Div18,
+        19 => MasterClockDivider::Div19,
+        20 => MasterClockDivider::Div20,
+        21 => MasterClockDivider::Div21,
+        22 => MasterClockDivider::Div22,
+        23 => MasterClockDivider::Div23,
+        24 => MasterClockDivider::Div24,
+        25 => MasterClockDivider::Div25,
+        26 => MasterClockDivider::Div26,
+        27 => MasterClockDivider::Div27,
+        28 => MasterClockDivider::Div28,
+        29 => MasterClockDivider::Div29,
+        30 => MasterClockDivider::Div30,
+        31 => MasterClockDivider::Div31,
+        32 => MasterClockDivider::Div32,
+        33 => MasterClockDivider::Div33,
+        34 => MasterClockDivider::Div34,
+        35 => MasterClockDivider::Div35,
+        36 => MasterClockDivider::Div36,
+        37 => MasterClockDivider::Div37,
+        38 => MasterClockDivider::Div38,
+        39 => MasterClockDivider::Div39,
+        40 => MasterClockDivider::Div40,
+        41 => MasterClockDivider::Div41,
+        42 => MasterClockDivider::Div42,
+        43 => MasterClockDivider::Div43,
+        44 => MasterClockDivider::Div44,
+        45 => MasterClockDivider::Div45,
+        46 => MasterClockDivider::Div46,
+        47 => MasterClockDivider::Div47,
+        48 => MasterClockDivider::Div48,
+        49 => MasterClockDivider::Div49,
+        50 => MasterClockDivider::Div50,
+        51 => MasterClockDivider::Div51,
+        52 => MasterClockDivider::Div52,
+        53 => MasterClockDivider::Div53,
+        54 => MasterClockDivider::Div54,
+        55 => MasterClockDivider::Div55,
+        56 => MasterClockDivider::Div56,
+        57 => MasterClockDivider::Div57,
+        58 => MasterClockDivider::Div58,
+        59 => MasterClockDivider::Div59,
+        60 => MasterClockDivider::Div60,
+        61 => MasterClockDivider::Div61,
+        62 => MasterClockDivider::Div62,
+        63 => MasterClockDivider::Div63,
+        _ => panic!(),
+    }
+}