Merge pull request #3857 from swork/swork-add-pio-functions

Add PIO functions.

embassy-rp/src/pio/mod.rs

@@ -651,7 +651,7 @@ impl<'d, PIO: Instance> Config<'d, PIO> {
     /// of the program. The state machine is not started.
     ///
     /// `side_set` sets the range of pins affected by side-sets. The range must be consecutive.
-    /// Side-set pins must configured as outputs using [`StateMachine::set_pin_dirs`] to be
+    /// Sideset pins must configured as outputs using [`StateMachine::set_pin_dirs`] to be
     /// effective.
     pub fn use_program(&mut self, prog: &LoadedProgram<'d, PIO>, side_set: &[&Pin<'d, PIO>]) {
         assert!((prog.side_set.bits() - prog.side_set.optional() as u8) as usize == side_set.len());
@@ -816,6 +816,51 @@ impl<'d, PIO: Instance + 'd, const SM: usize> StateMachine<'d, PIO, SM> {
         }
     }
 
+    /// Read current instruction address for this state machine
+    pub fn get_addr(&self) -> u8 {
+        let addr = Self::this_sm().addr();
+        addr.read().addr()
+    }
+
+    /// Read TX FIFO threshold for this state machine.
+    pub fn get_tx_threshold(&self) -> u8 {
+        let shiftctrl = Self::this_sm().shiftctrl();
+        shiftctrl.read().pull_thresh()
+    }
+
+    /// Set/change the TX FIFO threshold for this state machine.
+    pub fn set_tx_threshold(&mut self, threshold: u8) {
+        assert!(threshold <= 31);
+        let shiftctrl = Self::this_sm().shiftctrl();
+        shiftctrl.modify(|w| {
+            w.set_pull_thresh(threshold);
+        });
+    }
+
+    /// Read TX FIFO threshold for this state machine.
+    pub fn get_rx_threshold(&self) -> u8 {
+        Self::this_sm().shiftctrl().read().push_thresh()
+    }
+
+    /// Set/change the RX FIFO threshold for this state machine.
+    pub fn set_rx_threshold(&mut self, threshold: u8) {
+        assert!(threshold <= 31);
+        let shiftctrl = Self::this_sm().shiftctrl();
+        shiftctrl.modify(|w| {
+            w.set_push_thresh(threshold);
+        });
+    }
+
+    /// Set/change both TX and RX FIFO thresholds for this state machine.
+    pub fn set_thresholds(&mut self, threshold: u8) {
+        assert!(threshold <= 31);
+        let shiftctrl = Self::this_sm().shiftctrl();
+        shiftctrl.modify(|w| {
+            w.set_push_thresh(threshold);
+            w.set_pull_thresh(threshold);
+        });
+    }
+
     /// Set the clock divider for this state machine.
     pub fn set_clock_divider(&mut self, clock_divider: FixedU32<U8>) {
         let sm = Self::this_sm();