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//! A very simple, multi-board BSP for imxrt-rt-support examples.
#![no_std]
use imxrt_ral as ral;
cfg_if::cfg_if! {
if #[cfg(feature = "teensy4")] {
mod shared { pub mod imxrt10xx; }
use shared::imxrt10xx::prepare_pit;
mod teensy4;
pub use teensy4::*;
} else if #[cfg(feature = "imxrt1010evk")] {
mod shared { pub mod imxrt10xx; }
use shared::imxrt10xx::prepare_pit;
mod imxrt1010evk;
pub use imxrt1010evk::*;
} else if #[cfg(feature = "imxrt1170evk-cm7")] {
mod shared { pub mod imxrt11xx; }
use shared::imxrt11xx::prepare_pit;
mod imxrt1170evk_cm7;
pub use imxrt1170evk_cm7::*;
} else {
compile_error!("No board feature selected!");
}
}
pub struct Pit(&'static ral::pit::RegisterBlock);
impl Pit {
fn new(pit: &ral::pit::RegisterBlock, timer_delay_microseconds: u32) -> Self {
// Disable the PIT, just in case it was used by the boot ROM
ral::write_reg!(ral::pit, pit, MCR, MDIS: 1);
let timer = &pit.TIMER[0];
// Reset channel 0 control; we'll use channel 0 for our timer
ral::write_reg!(ral::pit::timer, timer, TCTRL, 0);
// Set the counter value
ral::write_reg!(ral::pit::timer, timer, LDVAL, timer_delay_microseconds);
// Enable the PIT timer
ral::modify_reg!(ral::pit, pit, MCR, MDIS: 0);
Self(unsafe {
core::mem::transmute::<&'_ ral::pit::RegisterBlock, &'static ral::pit::RegisterBlock>(
pit,
)
})
}
pub fn blocking_delay(&mut self) {
let timer = &self.0.TIMER[0];
// Start counting!
ral::write_reg!(ral::pit::timer, timer, TCTRL, TEN: 1);
// Are we done?
while ral::read_reg!(ral::pit::timer, timer, TFLG, TIF == 0) {}
// We're done; clear the flag
ral::write_reg!(ral::pit::timer, timer, TFLG, TIF: 1);
// Turn off the timer
ral::write_reg!(ral::pit::timer, timer, TCTRL, TEN: 0);
}
pub fn loop_with_interrupts(&mut self) {
let timer = &self.0.TIMER[0];
// Enable interrupts and start counting
ral::write_reg!(ral::pit::timer, timer, TCTRL, TIE: 1);
ral::modify_reg!(ral::pit::timer, timer, TCTRL, TEN: 1);
}
pub fn clear_interrupts(&mut self) {
let timer = &self.0.TIMER[0];
while ral::read_reg!(ral::pit::timer, timer, TFLG, TIF == 1) {
ral::write_reg!(ral::pit::timer, timer, TFLG, TIF: 1);
}
}
}
unsafe impl Send for Pit {}
pub struct Led {
offset: u32,
port: &'static ral::gpio::RegisterBlock,
}
impl Led {
fn new(offset: u32, port: &ral::gpio::RegisterBlock) -> Self {
let led = Led {
offset,
port: unsafe {
core::mem::transmute::<
&'_ ral::gpio::RegisterBlock,
&'static ral::gpio::RegisterBlock,
>(port)
},
};
ral::modify_reg!(ral::gpio, port, GDIR, |gdir| gdir | led.mask());
led
}
fn mask(&self) -> u32 {
1 << self.offset
}
pub fn set(&self) {
ral::write_reg!(ral::gpio, self.port, DR_SET, self.mask());
}
pub fn clear(&self) {
ral::write_reg!(ral::gpio, self.port, DR_CLEAR, self.mask());
}
pub fn toggle(&self) {
ral::write_reg!(ral::gpio, self.port, DR_TOGGLE, self.mask());
}
}
unsafe impl Send for Led {}
pub struct Resources {
pub led: crate::Led,
pub pit: crate::Pit,
}
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