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rp/pio: wrap sm rx, tx in structs and allow splitting

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this *finally* allows sound implementions of bidirectional transfers
without blocking. the futures previously allowed only a single direction
to be active at any given time, and the dma transfers didn't take a
mutable reference and were thus unsound.
This commit is contained in:
pennae
2023-05-03 12:49:55 +02:00
parent 77f7830da3
commit c44c108db5
6 changed files with 204 additions and 169 deletions
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16
examples/rp/src/bin/pio_hd44780.rs
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@@ -139,14 +139,14 @@ impl<'l> HD44780<'l> {
sm0.set_enable(true);
// init to 8 bit thrice
sm0.push_tx((50000 << 8) | 0x30);
sm0.push_tx((5000 << 8) | 0x30);
sm0.push_tx((200 << 8) | 0x30);
sm0.tx().push((50000 << 8) | 0x30);
sm0.tx().push((5000 << 8) | 0x30);
sm0.tx().push((200 << 8) | 0x30);
// init 4 bit
sm0.push_tx((200 << 8) | 0x20);
sm0.tx().push((200 << 8) | 0x20);
// set font and lines
sm0.push_tx((50 << 8) | 0x20);
sm0.push_tx(0b1100_0000);
sm0.tx().push((50 << 8) | 0x20);
sm0.tx().push(0b1100_0000);
irq0.wait().await;
sm0.set_enable(false);
@@ -216,7 +216,7 @@ impl<'l> HD44780<'l> {
sm0.set_enable(true);
// display on and cursor on and blinking, reset display
sm0.dma_push(dma.reborrow(), &[0x81u8, 0x0f, 1]).await;
sm0.tx().dma_push(dma.reborrow(), &[0x81u8, 0x0f, 1]).await;
Self {
dma: dma.map_into(),
@@ -240,6 +240,6 @@ impl<'l> HD44780<'l> {
// set cursor to 1:15
self.buf[38..].copy_from_slice(&[0x80, 0xcf]);
self.sm.dma_push(self.dma.reborrow(), &self.buf).await;
self.sm.tx().dma_push(self.dma.reborrow(), &self.buf).await;
}
}