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use log::{error, trace};
use nrf52840_hal::twis::{self, Twis, TwisInterrupt};
use starb::{Reader, RingBuffer, Writer};
static mut RB: RingBuffer<u8> = RingBuffer::new();
pub fn setup<T>(mut twis: Twis<T>) -> (Reader<'static, u8>, impl FnMut())
where
T: twis::Instance,
{
// TODO: we only care about `Write` and `Stopped`.
twis.enable_interrupt(TwisInterrupt::Stopped);
twis.enable_interrupt(TwisInterrupt::Error);
//twis.enable_interrupt(TwisInterrupt::RxStarted);
//twis.enable_interrupt(TwisInterrupt::TxStarted);
twis.enable_interrupt(TwisInterrupt::Write);
//twis.enable_interrupt(TwisInterrupt::Read);
let (rbr, mut rbw) = unsafe { RB.split() };
let cl = move || handler(&mut twis, &mut rbw);
(rbr, cl)
}
fn handler<T>(twis: &mut Twis<T>, writer: &mut Writer<u8>)
where
T: twis::Instance,
{
if twis.get_event_triggered(TwisInterrupt::Stopped, true) {
trace!("i²c stopped: {}", twis.amount());
} else if twis.get_event_triggered(TwisInterrupt::Error, true) {
trace!("i²c error");
//} else if twis.get_event_triggered(TwisInterrupt::RxStarted, true) {
// trace!("i²c rxstarted");
//} else if twis.get_event_triggered(TwisInterrupt::TxStarted, true) {
// trace!("i²c txstarted");
} else if twis.get_event_triggered(TwisInterrupt::Write, true) {
trace!("i²c write");
let mut buf: [u8; 255] = [0; 255];
match twis.read(&mut buf) {
Ok(len) => {
// Ignore unshift overflow for now, as I don't think
// there's much we can do about it.
writer.unshift_from(&buf[0..len]);
trace!("write done");
}
Err(e) => error!("{:?}", e),
}
//} else if twis.get_event_triggered(TwisInterrupt::Read, true) {
//trace!("i²c read");
} else {
trace!("i²c unknown");
}
}
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