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rp/spi: start rx dma first.

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This commit is contained in:
Dario Nieuwenhuis 2023-06-02 03:44:49 +02:00
parent d36feb6405
commit fa7510968a
1 changed files with 19 additions and 13 deletions
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32
embassy-rp/src/spi.rs
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@ -360,18 +360,22 @@ impl<'d, T: Instance> Spi<'d, T, Async> {
reg.set_txdmae(true);
})
};
let tx_ch = self.tx_dma.as_mut().unwrap();
let tx_transfer = unsafe {
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
crate::dma::write_repeated(tx_ch, self.inner.regs().dr().ptr() as *mut u8, buffer.len(), T::TX_DREQ)
};
// Start RX first. Transfer starts when TX starts, if RX
// is not started yet we might lose bytes.
let rx_ch = self.rx_dma.as_mut().unwrap();
let rx_transfer = unsafe {
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
crate::dma::read(rx_ch, self.inner.regs().dr().ptr() as *const _, buffer, T::RX_DREQ)
};
let tx_ch = self.tx_dma.as_mut().unwrap();
let tx_transfer = unsafe {
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
crate::dma::write_repeated(tx_ch, self.inner.regs().dr().ptr() as *mut u8, buffer.len(), T::TX_DREQ)
};
join(tx_transfer, rx_transfer).await;
Ok(())
}
@ -395,6 +399,15 @@ impl<'d, T: Instance> Spi<'d, T, Async> {
})
};
// Start RX first. Transfer starts when TX starts, if RX
// is not started yet we might lose bytes.
let rx_ch = self.rx_dma.as_mut().unwrap();
let rx_transfer = unsafe {
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
crate::dma::read(rx_ch, self.inner.regs().dr().ptr() as *const _, rx_ptr, T::RX_DREQ)
};
let mut tx_ch = self.tx_dma.as_mut().unwrap();
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
@ -411,13 +424,6 @@ impl<'d, T: Instance> Spi<'d, T, Async> {
}
}
};
let rx_ch = self.rx_dma.as_mut().unwrap();
let rx_transfer = unsafe {
// If we don't assign future to a variable, the data register pointer
// is held across an await and makes the future non-Send.
crate::dma::read(rx_ch, self.inner.regs().dr().ptr() as *const _, rx_ptr, T::RX_DREQ)
};
join(tx_transfer, rx_transfer).await;
// if tx > rx we should clear any overflow of the FIFO SPI buffer