Add SPIv1, use cfg_attr to pick correct impl.

Add IRQ to impl_rng!() to accomodate RNG vs HASH_RNG split.

embassy-stm32-examples/src/bin/spi.rs

@@ -0,0 +1,94 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use embassy_stm32::gpio::{Level, Output, Input, Pull};
+use embedded_hal::digital::v2::{OutputPin, InputPin};
+use example_common::*;
+
+use cortex_m_rt::entry;
+use stm32f4::stm32f429 as pac;
+//use stm32l4::stm32l4x5 as pac;
+use embassy_stm32::spi::{Spi, MODE_0, ByteOrder, Config};
+use embassy_stm32::time::Hertz;
+use embedded_hal::blocking::spi::Transfer;
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World, dude!");
+
+    let pp = pac::Peripherals::take().unwrap();
+
+    pp.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+    pp.RCC.ahb1enr.modify(|_, w| w.dma1en().set_bit());
+
+    pp.RCC.apb1enr.modify(|_, w| {
+        w.spi3en().enabled();
+        w
+    });
+
+    pp.RCC.ahb1enr.modify(|_, w| {
+        w.gpioaen().enabled();
+        w.gpioben().enabled();
+        w.gpiocen().enabled();
+        w.gpioden().enabled();
+        w.gpioeen().enabled();
+        w.gpiofen().enabled();
+        w
+    });
+
+    let rc = pp.RCC.cfgr.read().sws().bits();
+    info!("rcc -> {}", rc);
+    let p = embassy_stm32::init(Default::default());
+
+    let mut led = Output::new(p.PA5, Level::High);
+    let mut spi = Spi::new(
+        Hertz(16_000_000),
+        p.SPI3,
+        p.PC10,
+        p.PC12,
+        p.PC11,
+        Hertz(1_000_000),
+        Config::default(),
+    );
+
+    let mut cs = Output::new( p.PE0, Level::High);
+    cs.set_low();
+
+    let mut rdy = Input::new(p.PE1, Pull::Down);
+    let mut wake = Output::new( p.PB13, Level::Low);
+    let mut reset = Output::new( p.PE8, Level::Low);
+
+    wake.set_high().unwrap();
+    reset.set_high().unwrap();
+
+    loop {
+        info!("loop");
+        while rdy.is_low().unwrap() {
+            info!("await ready")
+        }
+        info!("ready");
+        let mut buf = [0x0A;4];
+        spi.transfer(&mut buf);
+        info!("xfer {=[u8]:x}", buf);
+    }
+
+    loop {
+        info!("high");
+        led.set_high().unwrap();
+        cortex_m::asm::delay(10_000_000);
+        info!("low");
+        led.set_low().unwrap();
+        cortex_m::asm::delay(10_000_000);
+    }
+}