add TTC driver

zynq7000-hal/src/lib.rs

@@ -23,6 +23,7 @@ pub mod slcr;
 pub mod spi;
 pub mod time;
 pub mod uart;
+pub mod ttc;
 
 /// This enumeration encodes the various boot sources.
 #[derive(Debug, Copy, Clone)]

zynq7000-hal/src/ttc.rs

@@ -0,0 +1,45 @@
+//! Triple-timer counter (TTC) high-level driver.
+
+use arbitrary_int::u3;
+
+use crate::gpio::{IoPeriph, Mio30, Mio31, MioPin, MuxConf, PinMode};
+#[cfg(not(feature = "7z010-7z007s-clg225"))]
+use crate::gpio::{Mio18, Mio19, Mio42, Mio43};
+
+/// Each TTC consists of three independent timers/counters.
+#[derive(Debug, Copy, Clone)]
+pub enum TtcId {
+    Ttc0 = 0,
+    Ttc1 = 1,
+}
+
+pub const TTC_MUX_CONF: MuxConf = MuxConf::new_with_l3(u3::new(0b110));
+
+pub trait ClockInPin {
+    const ID: TtcId;
+}
+
+pub trait WaveOutPin {
+    const ID: TtcId;
+}
+
+macro_rules! into_ttc {
+    ($($Mio:ident),+) => {
+        $(
+            impl <M: PinMode> MioPin<$Mio, M> {
+                /// Convert the pin into a TTC pin by configuring the pin routing via the
+                /// MIO multiplexer bits.
+                pub fn into_ttck(self) -> MioPin<$Mio, IoPeriph> {
+                    // Enable pull-ups for the I2C pins.
+                    self.into_io_periph(TTC_MUX_CONF, None)
+                }
+            }
+        )+
+    };
+}
+
+#[cfg(not(feature = "7z010-7z007s-clg225"))]
+into_ttc!(Mio18, Mio19, Mio42, Mio43);
+into_ttc!(Mio30, Mio31);
+
+pub struct Pwm {}