Implement SAI

Author: DerFetzer

Cargo.toml

@@ -197,3 +197,7 @@ required-features = ["rt"]
 [[example]]
 name = "adc_dma"
 required-features = ["rt"]
+
+[[example]]
+name = "audio"
+required-features = ["rt", "stm32l496"] # Register  for PLLSAI1 incomplete in L4x3, gate so CI will pass

examples/audio.rs

@@ -0,0 +1,102 @@
+#![no_std]
+#![no_main]
+
+use panic_rtt_target as _;
+
+use cortex_m_rt::entry;
+use rtt_target::rprintln;
+
+use stm32l4xx_hal::{
+    delay::Delay,
+    gpio::{Alternate, Pin, PushPull, H8, L8},
+    pac,
+    prelude::*,
+    rcc::{MsiFreq, PllConfig},
+    sai::{I2SChanConfig, I2SDataSize, I2SDir, I2sUsers, Sai},
+    traits::i2s::FullDuplex,
+};
+
+type SaiPins = (
+    Pin<Alternate<PushPull, 13_u8>, L8, 'E', 2_u8>,
+    Pin<Alternate<PushPull, 13_u8>, L8, 'E', 5_u8>,
+    Pin<Alternate<PushPull, 13_u8>, L8, 'E', 4_u8>,
+    Pin<Alternate<PushPull, 13_u8>, L8, 'E', 6_u8>,
+    Option<Pin<Alternate<PushPull, 13_u8>, H8, 'A', 13_u8>>,
+);
+
+#[entry]
+fn main() -> ! {
+    rtt_target::rtt_init_print!();
+    rprintln!("Initializing... ");
+
+    let cp = pac::CorePeripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    let mut flash = dp.FLASH.constrain();
+    let mut rcc = dp.RCC.constrain();
+    let mut pwr = dp.PWR.constrain(&mut rcc.apb1r1);
+
+    let clocks = rcc
+        .cfgr
+        .msi(MsiFreq::RANGE8M)
+        .sysclk(80.mhz())
+        .hclk(80.mhz())
+        .pclk1(80.mhz())
+        .pclk2(80.mhz())
+        .sai1clk_with_pll(4_016_000.hz(), PllConfig::new(1, 13, Some(25), None, None))
+        .freeze(&mut flash.acr, &mut pwr);
+
+    rprintln!(
+        "clocks: sysclk: {:?}, hclk: {:?}, pclk1: {:?}, pclk2: {:?}",
+        clocks.sysclk().0,
+        clocks.hclk().0,
+        clocks.pclk1().0,
+        clocks.pclk2().0
+    );
+
+    let mut delay = Delay::new(cp.SYST, clocks);
+
+    // GPIO
+    ///////
+
+    let mut gpioe = dp.GPIOE.split(&mut rcc.ahb2);
+
+    let mclk =
+        gpioe
+            .pe2
+            .into_alternate_push_pull(&mut gpioe.moder, &mut gpioe.otyper, &mut gpioe.afrl);
+    let fs =
+        gpioe
+            .pe4
+            .into_alternate_push_pull(&mut gpioe.moder, &mut gpioe.otyper, &mut gpioe.afrl);
+    let sck =
+        gpioe
+            .pe5
+            .into_alternate_push_pull(&mut gpioe.moder, &mut gpioe.otyper, &mut gpioe.afrl);
+    let fd =
+        gpioe
+            .pe6
+            .into_alternate_push_pull(&mut gpioe.moder, &mut gpioe.otyper, &mut gpioe.afrl);
+
+    let sai_pins: SaiPins = (mclk, sck, fs, fd, None);
+
+    rprintln!("Sai... ");
+    let mut sai = Sai::i2s_sai1_ch_a(
+        dp.SAI1,
+        sai_pins,
+        16_000.hz(),
+        I2SDataSize::Bits24,
+        &mut rcc.apb2,
+        &clocks,
+        I2sUsers::new(I2SChanConfig::new(I2SDir::Tx)),
+    );
+
+    rprintln!("Sai enable... ");
+    sai.enable();
+
+    rprintln!("Looping... ");
+    loop {
+        sai.try_send(0xaa, 0xcc).unwrap();
+        delay.delay_ms(5_u32);
+    }
+}

src/lib.rs

@@ -172,6 +172,8 @@ pub mod rng;
 #[cfg(not(any(feature = "stm32l4r9", feature = "stm32l4s9",)))]
 pub mod rtc;
 #[cfg(not(any(feature = "stm32l4r9", feature = "stm32l4s9",)))]
+pub mod sai;
+#[cfg(not(any(feature = "stm32l4r9", feature = "stm32l4s9",)))]
 pub mod serial;
 #[cfg(not(any(feature = "stm32l4r9", feature = "stm32l4s9",)))]
 pub mod signature;