Added delay us and ns

src/lib.rs

@@ -675,6 +675,20 @@ pub fn delay_ms(num_ms: u32, ahb_freq: u32) {
     delay.delay_ms(num_ms);
 }
 
+/// A blocking delay, for a specified time in μs.
+pub fn delay_us(num_us: u32, ahb_freq: u32) {
+    let cp = unsafe { cortex_m::Peripherals::steal() };
+    let mut delay = Delay::new(cp.SYST, ahb_freq);
+    delay.delay_us(num_us);
+}
+
+/// A blocking delay, for a specified time in ns.
+pub fn delay_ns(num_ns: u32, ahb_freq: u32) {
+    let cp = unsafe { cortex_m::Peripherals::steal() };
+    let mut delay = Delay::new(cp.SYST, ahb_freq);
+    delay.delay_ns(num_ns);
+}
+
 /// In the prelude, we export helper macros.
 pub mod prelude {
     pub use access_global;

src/spi.rs

@@ -613,16 +613,27 @@ where
     #[cfg(not(any(feature = "h5", feature = "h7")))]
     pub fn transfer_type2<'w>(&mut self, write_buf: &'w [u8], read_buf: &'w mut [u8]) -> Result<(), SpiError> {
         println!("Write buf: {:?}, Read buf: {:?}", write_buf, read_buf);
+
+        let mut i_read = 0;
+
         for (i_write, word) in write_buf.iter().enumerate() {
             self.write_one(*word)?;
-            // let i_read = i + write_buf.len();
-            if i_write >= write_buf.len() - 1 {
-                let i_read = i_write - write_buf.len() + 1;
-                read_buf[i_read] = self.read()?;
-                println!("read: {:?}", read_buf[i_read]);
-            }
+            read_buf[i_write] = self.read()?;
+            println!("read: {}", read_buf[i_write]);
         }
 
+        // for (i_write, word) in write_buf.iter().enumerate() {
+        //     self.write_one(*word)?;
+        //     // let i_read = i + write_buf.len();
+        //
+        //     if i_write >= write_buf.len() - 1 {
+        //         // let i_read = i_write - write_buf.len() + 1;
+        //         read_buf[i_read] = self.read()?;
+        //         println!("read. i:{} v:{:?}", i_read, read_buf[i_read]);
+        //         i_read += 1;
+        //     }
+        // }
+
         Ok(())
     }