feat: try aes and find out the HW does not offer it

examples/aes_ecb.rs

@@ -0,0 +1,46 @@
+#![no_main]
+#![no_std]
+
+use defmt::{debug, info};
+use hal::pwr::PWR;
+use hal::rtc::{Datelike, NaiveDateTime, Rtc, Timelike};
+use panic_probe as _;
+
+use defmt_rtt as _; // global logger
+
+use cortex_m_rt::entry;
+use hal::{pac, prelude::*, rcc::Config};
+
+const AES_PT: [u8; 16] = [
+    0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+];
+const AES_KEY: [u32; 4] = [0x1991, 0x1991, 0xAAAAAAAA, 0xBBBBBBBB];
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.freeze(Config::hsi16());
+    let mut delay = cp.SYST.delay(rcc.clocks);
+
+    compile_error!("The chip does not have an AES unit >:{");
+    let aes = hal::aes::AES::new(dp.AES, &mut rcc);
+    let mut ecb_stream = aes.enable(<dyn hal::aes::Mode>::ecb_encrypt(), AES_KEY);
+    let mut encbuf: [[u8; 16]; 4] = [[0; 16]; 4];
+
+    let mut i = 0;
+    debug!("Entering Loop");
+    #[allow(clippy::never_loop)]
+    loop {
+        debug!("reading from aes stream");
+        encbuf[i % 4] = ecb_stream.process(&AES_PT).unwrap();
+
+        info!("encbuf[{:02}]: {:02x}", i, encbuf);
+
+        if i > 100 {
+            delay.delay_ms(200_u16);
+        }
+        i += 1;
+    }
+}