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fix issues when DAC2 present, add additional options to DMA (NOT YET WORKING with STM32H7A3ZI)

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This commit is contained in:
JuliDi
2023-06-26 09:42:25 +02:00
parent 8cafaa1f3c
commit e7bc84dda8
3 changed files with 178 additions and 119 deletions
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267
embassy-stm32/src/dac/mod.rs
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@ -171,13 +171,6 @@ pub trait DacChannel<T: Instance, Tx> {
}
Ok(())
}
/// Write `data` to the DAC channel via DMA.
///
/// `circular` sets the DMA to circular mode.
async fn write(&mut self, data: ValueArray<'_>, circular: bool) -> Result<(), Error>
where
Tx: Dma<T>;
}
/// Hold two DAC channels
@ -244,6 +237,81 @@ impl<'d, T: Instance, Tx> DacCh1<'d, T, Tx> {
});
Ok(())
}
/// Write `data` to the DAC CH1 via DMA.
///
/// To prevent delays/glitches when outputting a periodic waveform, the `circular` flag can be set.
/// This will configure a circular DMA transfer that periodically outputs the `data`.
/// Note that for performance reasons in circular mode the transfer complete interrupt is disabled.
///
/// **Important:** Channel 1 has to be configured for the DAC instance!
pub async fn write(&mut self, data: ValueArray<'_>, circular: bool) -> Result<(), Error>
where
Tx: DmaCh1<T>,
{
let channel = Channel::Ch1.index();
debug!("Writing to channel {}", channel);
// Enable DAC and DMA
T::regs().cr().modify(|w| {
w.set_en(channel, true);
w.set_dmaen(channel, true);
});
let tx_request = self.dma.request();
let dma_channel = &self.dma;
let tx_options = TransferOptions {
circular,
half_transfer_ir: false,
complete_transfer_ir: !circular,
..Default::default()
};
// Initiate the correct type of DMA transfer depending on what data is passed
let tx_f = match data {
ValueArray::Bit8(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr8r(channel).as_ptr() as *mut u8,
tx_options,
)
},
ValueArray::Bit12Left(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12l(channel).as_ptr() as *mut u16,
tx_options,
)
},
ValueArray::Bit12Right(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12r(channel).as_ptr() as *mut u16,
tx_options,
)
},
};
tx_f.await;
// finish dma
// TODO: Do we need to check any status registers here?
T::regs().cr().modify(|w| {
// Disable the DAC peripheral
w.set_en(channel, false);
// Disable the DMA. TODO: Is this necessary?
w.set_dmaen(channel, false);
});
Ok(())
}
}
impl<'d, T: Instance, Tx> DacCh2<'d, T, Tx> {
@ -279,6 +347,81 @@ impl<'d, T: Instance, Tx> DacCh2<'d, T, Tx> {
});
Ok(())
}
/// Write `data` to the DAC CH2 via DMA.
///
/// To prevent delays/glitches when outputting a periodic waveform, the `circular` flag can be set.
/// This will configure a circular DMA transfer that periodically outputs the `data`.
/// Note that for performance reasons in circular mode the transfer complete interrupt is disabled.
///
/// **Important:** Channel 2 has to be configured for the DAC instance!
pub async fn write(&mut self, data: ValueArray<'_>, circular: bool) -> Result<(), Error>
where
Tx: DmaCh2<T>,
{
let channel = Channel::Ch2.index();
debug!("Writing to channel {}", channel);
// Enable DAC and DMA
T::regs().cr().modify(|w| {
w.set_en(channel, true);
w.set_dmaen(channel, true);
});
let tx_request = self.dma.request();
let dma_channel = &self.dma;
let tx_options = TransferOptions {
circular,
half_transfer_ir: false,
complete_transfer_ir: !circular,
..Default::default()
};
// Initiate the correct type of DMA transfer depending on what data is passed
let tx_f = match data {
ValueArray::Bit8(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr8r(channel).as_ptr() as *mut u8,
tx_options,
)
},
ValueArray::Bit12Left(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12l(channel).as_ptr() as *mut u16,
tx_options,
)
},
ValueArray::Bit12Right(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12r(channel).as_ptr() as *mut u16,
tx_options,
)
},
};
tx_f.await;
// finish dma
// TODO: Do we need to check any status registers here?
T::regs().cr().modify(|w| {
// Disable the DAC peripheral
w.set_en(channel, false);
// Disable the DMA. TODO: Is this necessary?
w.set_dmaen(channel, false);
});
Ok(())
}
}
impl<'d, T: Instance, TxCh1, TxCh2> Dac<'d, T, TxCh1, TxCh2> {
@ -350,117 +493,10 @@ impl<'d, T: Instance, TxCh1, TxCh2> Dac<'d, T, TxCh1, TxCh2> {
impl<'d, T: Instance, Tx> DacChannel<T, Tx> for DacCh1<'d, T, Tx> {
const CHANNEL: Channel = Channel::Ch1;
/// Write `data` to the DAC CH1 via DMA.
///
/// To prevent delays/glitches when outputting a periodic waveform, the `circular` flag can be set.
/// This will configure a circular DMA transfer that periodically outputs the `data`.
/// Note that for performance reasons in circular mode the transfer complete interrupt is disabled.
///
/// **Important:** Channel 1 has to be configured for the DAC instance!
async fn write(&mut self, data: ValueArray<'_>, circular: bool) -> Result<(), Error>
where
Tx: Dma<T>,
{
write_inner(Self::CHANNEL, &self.dma, data, circular).await
}
}
impl<'d, T: Instance, Tx> DacChannel<T, Tx> for DacCh2<'d, T, Tx> {
const CHANNEL: Channel = Channel::Ch2;
/// Write `data` to the DAC CH2 via DMA.
///
/// To prevent delays/glitches when outputting a periodic waveform, the `circular` flag can be set.
/// This will configure a circular DMA transfer that periodically outputs the `data`.
/// Note that for performance reasons in circular mode the transfer complete interrupt is disabled.
///
/// **Important:** Channel 2 has to be configured for the DAC instance!
async fn write(&mut self, data: ValueArray<'_>, circular: bool) -> Result<(), Error>
where
Tx: Dma<T>,
{
write_inner(Self::CHANNEL, &self.dma, data, circular).await
}
}
/// Shared utility function to perform the actual DMA config and write.
async fn write_inner<T: Instance, Tx>(
ch: Channel,
dma: &PeripheralRef<'_, Tx>,
data: ValueArray<'_>,
circular: bool,
) -> Result<(), Error>
where
Tx: Dma<T>,
{
let channel = ch.index();
debug!("Writing to channel {}", channel);
// Enable DAC and DMA
T::regs().cr().modify(|w| {
w.set_en(channel, true);
w.set_dmaen(channel, true);
});
let tx_request = dma.request();
let dma_channel = dma;
// Initiate the correct type of DMA transfer depending on what data is passed
let tx_f = match data {
ValueArray::Bit8(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr8r(channel).as_ptr() as *mut u8,
TransferOptions {
circular,
half_transfer_ir: false,
complete_transfer_ir: !circular,
},
)
},
ValueArray::Bit12Left(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12l(channel).as_ptr() as *mut u16,
TransferOptions {
circular,
half_transfer_ir: false,
complete_transfer_ir: !circular,
},
)
},
ValueArray::Bit12Right(buf) => unsafe {
Transfer::new_write(
dma_channel,
tx_request,
buf,
T::regs().dhr12r(channel).as_ptr() as *mut u16,
TransferOptions {
circular,
half_transfer_ir: false,
complete_transfer_ir: !circular,
},
)
},
};
tx_f.await;
// finish dma
// TODO: Do we need to check any status registers here?
T::regs().cr().modify(|w| {
// Disable the DAC peripheral
w.set_en(channel, false);
// Disable the DMA. TODO: Is this necessary?
w.set_dmaen(channel, false);
});
Ok(())
}
pub(crate) mod sealed {
@ -470,7 +506,8 @@ pub(crate) mod sealed {
}
pub trait Instance: sealed::Instance + RccPeripheral + 'static {}
dma_trait!(Dma, Instance);
dma_trait!(DmaCh1, Instance);
dma_trait!(DmaCh2, Instance);
/// Marks a pin that can be used with the DAC
pub trait DacPin<T: Instance, const C: u8>: crate::gpio::Pin + 'static {}