diff options
| -rw-r--r-- | embassy-rp/src/i2c.rs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/embassy-rp/src/i2c.rs b/embassy-rp/src/i2c.rs index f004c522..68cfc653 100644 --- a/embassy-rp/src/i2c.rs +++ b/embassy-rp/src/i2c.rs @@ -243,12 +243,18 @@ impl<'d, T: Instance> I2c<'d, T, Async> { if let abort_reason @ Err(_) = me.read_and_clear_abort_reason() { Poll::Ready(abort_reason) } else if !Self::tx_fifo_full() { + // resume if there's any space free in the tx fifo Poll::Ready(Ok(())) } else { Poll::Pending } }, |_me| unsafe { + // Set tx "free" threshold a little high so that we get + // woken before the fifo completely drains to minimize + // transfer stalls. + p.ic_tx_tl().write(|w| w.set_tx_tl(1)); + p.ic_intr_mask().modify(|w| { w.set_m_tx_empty(true); w.set_m_tx_abrt(true); |