First commit

1 files changed, 37 insertions, 0 deletions

diff --git a/board/src/teensy4.rs b/board/src/teensy4.rs
new file mode 100644
index 0000000..28587cd
--- /dev/null
+++ b/board/src/teensy4.rs
@@ -0,0 +1,37 @@
+//! Teensy4 support.
+
+use crate::ral;
+
+#[cfg(target_arch = "arm")]
+use teensy4_fcb as _;
+#[cfg(target_arch = "arm")]
+use teensy4_panic as _;
+
+const LED_OFFSET: u32 = 3;
+
+pub mod rtic_support {
+    pub use crate::ral::*;
+}
+
+/// Prepare the board for the examples.
+///
+/// Call this first. Panics if something went wrong.
+pub fn prepare(timer_delay_microseconds: u32) -> Option<crate::Resources> {
+    let iomuxc = unsafe { ral::iomuxc::IOMUXC::instance() };
+    // Set the GPIO pad to a GPIO function (ALT 5)
+    ral::write_reg!(ral::iomuxc, iomuxc, SW_MUX_CTL_PAD_GPIO_B0_03, 5);
+    // Increase drive strength, but leave other fields at their current value...
+    ral::modify_reg!(
+        ral::iomuxc,
+        iomuxc,
+        SW_PAD_CTL_PAD_GPIO_B0_03,
+        DSE: DSE_7_R0_7
+    );
+
+    let pit = crate::prepare_pit(timer_delay_microseconds)?;
+    let gpio2 = unsafe { ral::gpio::GPIO2::instance() };
+    Some(crate::Resources {
+        led: crate::Led::new(LED_OFFSET, &gpio2),
+        pit,
+    })
+}