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Add function to clear PIO fifos #670

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Oct 24, 2023
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Add function to clear PIO fifos #670

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16 changes: 16 additions & 0 deletions rp2040-hal/src/pio.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -628,6 +628,22 @@ impl<SM: ValidStateMachine, State> StateMachine<SM, State> {
unsafe { self.sm.sm().sm_execctrl.read().exec_stalled().bit() }
}

/// Clear both TX and RX FIFOs
pub fn clear_fifos(&mut self) {
// Safety: all accesses to these registers are controlled by this instance
unsafe {
let sm = &self.sm.sm();
let sm_shiftctrl = &sm.sm_shiftctrl;
let mut current = false;
// Toggling the FIFO join state clears the fifo
sm_shiftctrl.modify(|r, w| {
current = r.fjoin_rx().bit();
w.fjoin_rx().bit(!current)
});
sm_shiftctrl.modify(|_, w| w.fjoin_rx().bit(current));
}
}

/// Drain Tx fifo.
pub fn drain_tx_fifo(&mut self) {
// According to the datasheet 3.5.4.2 Page 358:
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