dd tx_pulldown pin

bluepill-rs/src/dmx.rs

@@ -76,6 +76,7 @@ impl<const DMX_LEN: usize> TxDMA<DMX_LEN> {
 #[allow(clippy::upper_case_acronyms)]
 pub struct DMX<const DMX_LEN: usize> {
     tx_universe: DMXUniverse<DMX_LEN>,
+    tx_pulldown: gpio::PA8<gpio::Output<gpio::OpenDrain>>,
     sender: TxDMA<DMX_LEN>,
 }
 
@@ -84,6 +85,7 @@ impl<const DMX_LEN: usize> DMX<DMX_LEN> {
     pub fn new(
         mem: &'static mut [u8],
         mut dma_channel: dma::dma1::C4,
+        pa8: gpio::PA8,
         pa9: gpio::PA9,
         pa10: gpio::PA10,
         acrh: &mut gpio::Cr<'A', true>,
@@ -125,6 +127,7 @@ impl<const DMX_LEN: usize> DMX<DMX_LEN> {
 
         Self {
             tx_universe,
+            tx_pulldown: pa8.into_open_drain_output_with_state(acrh, gpio::PinState::High),
             sender: TxDMA::new(TxDMAIdle {
                 tx: serial.tx.with_dma(dma_channel),
                 buffer: tx_buffer,

bluepill-rs/src/main.rs

@@ -82,6 +82,7 @@ mod app {
                 dmx: DMX::new(
                     cx.local.buffer,
                     dma1.4,
+                    gpioa.pa8,
                     gpioa.pa9,
                     gpioa.pa10,
                     &mut gpioa.crh,