Updating stream methodology
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b9284451e4
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@ -7,10 +7,6 @@ use smoltcp_nal::embedded_nal::{IpAddr, Ipv4Addr, SocketAddr, UdpClientStack};
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use super::NetworkReference;
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use crate::hardware::design_parameters::SAMPLE_BUFFER_SIZE;
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// The number of samples contained in a single block. Note that each sample corresponds ot 8 byte
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// s(2 bytes per ADC/DAC code, 4 codes total).
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const BLOCK_SAMPLE_SIZE: usize = 50;
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// The number of data blocks that we will buffer in the queue.
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const BLOCK_BUFFER_SIZE: usize = 30;
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@ -56,57 +52,16 @@ pub fn setup_streaming(
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(generator, stream)
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}
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fn serialize_blocks<'a>(
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buffer: &'a mut [u8],
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max_buffer_size: usize,
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queue: &mut Consumer<'static, AdcDacData, BLOCK_BUFFER_SIZE>,
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) -> &'a [u8] {
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// While there is space in the buffer, serialize into it.
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let block_size = (SAMPLE_BUFFER_SIZE / SUBSAMPLE_RATE * 2) * 2 * 2 + 8;
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// Truncate the buffer to the maximum buffer size.
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let buffer: &mut [u8] = if buffer.len() > max_buffer_size {
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&mut buffer[..max_buffer_size]
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} else {
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buffer
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};
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// Serialize blocks into the buffer until either the buffer or the queue are exhausted.
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let mut enqueued_blocks: usize = 0;
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for buf in buffer.chunks_exact_mut(block_size) {
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// If there are no more blocks, return the serialized data.
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let data = match queue.dequeue() {
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Some(data) => data,
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None => break,
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};
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let block = DataBlock {
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adcs: data.adcs,
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dacs: data.dacs,
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block_id: data.block_id,
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block_size: SAMPLE_BUFFER_SIZE,
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};
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enqueued_blocks += 1;
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let length = block.to_slice(buf, SUBSAMPLE_RATE);
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assert!(length == block_size);
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}
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&buffer[..block_size * enqueued_blocks]
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}
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#[derive(Debug, Copy, Clone)]
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pub struct AdcDacData {
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block_id: u32,
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adcs: [[u16; BLOCK_SAMPLE_SIZE]; 2],
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dacs: [[u16; BLOCK_SAMPLE_SIZE]; 2],
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block_id: u16,
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adcs: [[u16; SAMPLE_BUFFER_SIZE]; 2],
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dacs: [[u16; SAMPLE_BUFFER_SIZE]; 2],
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}
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pub struct BlockGenerator {
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queue: Producer<'static, AdcDacData, BLOCK_BUFFER_SIZE>,
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current_block: AdcDacData,
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num_samples: usize,
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current_id: u16,
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}
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impl BlockGenerator {
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@ -115,12 +70,7 @@ impl BlockGenerator {
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) -> Self {
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Self {
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queue,
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current_block: AdcDacData {
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block_id: 0,
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adcs: [[0; BLOCK_SAMPLE_SIZE]; 2],
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dacs: [[0; BLOCK_SAMPLE_SIZE]; 2],
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},
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num_samples: 0,
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current_id: 0,
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}
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}
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@ -129,47 +79,14 @@ impl BlockGenerator {
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adcs: &[&mut [u16; SAMPLE_BUFFER_SIZE]; 2],
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dacs: &[&mut [u16; SAMPLE_BUFFER_SIZE]; 2],
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) {
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let mut processed_samples = 0;
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let block = AdcDacData {
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block_id: self.current_id,
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adcs: [*adcs[0], *adcs[1]],
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dacs: [*dacs[0], *dacs[1]],
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};
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while processed_samples < SAMPLE_BUFFER_SIZE {
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let remaining_samples = SAMPLE_BUFFER_SIZE - processed_samples;
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let free_space = BLOCK_SAMPLE_SIZE - self.num_samples;
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let copy_sample_length = if remaining_samples < free_space {
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remaining_samples
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} else {
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free_space
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};
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let start_src = self.num_samples;
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let end_src = start_src + copy_sample_length;
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let start_dst = processed_samples;
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let end_dst = start_dst + copy_sample_length;
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self.current_block.adcs[0][start_src..end_src]
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.copy_from_slice(&adcs[0][start_dst..end_dst]);
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self.current_block.adcs[1][start_src..end_src]
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.copy_from_slice(&adcs[1][start_dst..end_dst]);
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self.current_block.dacs[0][start_src..end_src]
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.copy_from_slice(&dacs[0][start_dst..end_dst]);
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self.current_block.dacs[1][start_src..end_src]
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.copy_from_slice(&dacs[1][start_dst..end_dst]);
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self.num_samples += copy_sample_length;
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// If the data block is full, push it onto the queue.
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if self.num_samples == BLOCK_SAMPLE_SIZE {
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// Note: We silently ignore dropped blocks here. The queue can fill up if the
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// service routing isn't being called often enough.
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self.queue.enqueue(self.current_block).ok();
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self.current_block.block_id =
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self.current_block.block_id.wrapping_add(1);
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self.num_samples = 0;
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}
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processed_samples += copy_sample_length;
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}
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self.current_id = self.current_id.wrapping_add(1);
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self.queue.enqueue(block).ok();
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}
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}
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@ -181,31 +98,86 @@ pub struct DataStream {
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buffer: [u8; 1024],
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}
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struct DataBlock {
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block_id: u32,
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block_size: usize,
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adcs: [[u16; BLOCK_SAMPLE_SIZE]; 2],
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dacs: [[u16; BLOCK_SAMPLE_SIZE]; 2],
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// Datapacket format:
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//
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// Header:
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// [0..2]: Start block ID (u16)
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// [2..3]: Num Blocks present (u8) <N>
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// [3..4]: Batch Size (u8) <BS>
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//
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// Following the header, batches are added sequentially. Each batch takes the form of:
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// [<BS>*0..<BS>*2]: ADC0
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// [<BS>*2..<BS>*4]: ADC1
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// [<BS>*4..<BS>*6]: DAC0
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// [<BS>*6..<BS>*8]: DAC1
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struct DataPacket<'a> {
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buf: &'a mut [u8],
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subsample_rate: usize,
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start_id: Option<u16>,
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num_blocks: u8,
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write_index: usize,
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}
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impl DataBlock {
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pub fn to_slice(self, buf: &mut [u8], subsample: usize) -> usize {
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let block_size = self.block_size / subsample;
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buf[0..4].copy_from_slice(&self.block_id.to_be_bytes());
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buf[4..8].copy_from_slice(&block_size.to_be_bytes());
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impl<'a> DataPacket<'a> {
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pub fn new(buf: &'a mut [u8], subsample_rate: usize) -> Self {
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Self {
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buf,
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start_id: None,
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num_blocks: 0,
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subsample_rate,
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write_index: 4,
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}
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}
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let mut offset: usize = 8;
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for device in &[self.adcs, self.dacs] {
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pub fn add_batch(&mut self, batch: &AdcDacData) -> Result<(), ()> {
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// Check that the block is sequential.
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if let Some(id) = &self.start_id {
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if batch.block_id != id.wrapping_add(self.num_blocks.into()) {
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return Err(());
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}
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} else {
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// Otherwise, this is the first block. Record the strt ID.
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self.start_id = Some(batch.block_id);
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}
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// Check that there is space for the block.
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let block_size_bytes = SAMPLE_BUFFER_SIZE / self.subsample_rate * 4 * 2;
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if self.buf.len() - self.get_packet_size() < block_size_bytes {
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return Err(());
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}
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// Copy the samples into the buffer.
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for device in &[batch.adcs, batch.dacs] {
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for channel in device {
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for sample in channel.iter().step_by(subsample) {
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buf[offset..offset + 2]
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for sample in channel.iter().step_by(self.subsample_rate) {
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self.buf[self.write_index..self.write_index + 2]
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.copy_from_slice(&sample.to_be_bytes());
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offset += 2;
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self.write_index += 2;
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}
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}
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}
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offset
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Ok(())
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}
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fn get_packet_size(&self) -> usize {
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let header_length = 4;
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let block_sample_size = SAMPLE_BUFFER_SIZE / self.subsample_rate;
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let block_size_bytes = block_sample_size * 2 * 4;
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block_size_bytes * self.num_blocks as usize + header_length
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}
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pub fn finish(self) -> usize {
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let block_sample_size = SAMPLE_BUFFER_SIZE / self.subsample_rate;
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// Write the header into the block.
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self.buf[0..2].copy_from_slice(&self.start_id.unwrap().to_be_bytes());
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self.buf[2] = self.num_blocks;
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self.buf[3] = block_sample_size as u8;
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// Return the length of the packet to transmit.
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self.get_packet_size()
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}
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}
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@ -285,21 +257,23 @@ impl DataStream {
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}
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if self.queue.ready() {
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let mut handle = self.socket.borrow_mut().unwrap();
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let capacity = self
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.stack
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.lock(|stack| {
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stack.with_udp_socket(handle, |socket| {
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socket.payload_send_capacity()
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})
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})
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.unwrap();
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// Dequeue data from the queue into a larger block structure.
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let mut packet = DataPacket::new(&mut self.buffer, SUBSAMPLE_RATE);
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while self.queue.ready() {
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// Note(unwrap): We check above that the queue is ready before calling this.
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if packet.add_batch(self.queue.peek().unwrap()).is_err() {
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// If we cannot add another batch, break out of the loop and send the packet.
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break;
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}
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let data =
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serialize_blocks(&mut self.buffer, capacity, &mut self.queue);
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// Remove the batch that we just added.
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self.queue.dequeue();
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}
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// Transmit the data block.
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self.stack.send(&mut handle, &data).ok();
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let mut handle = self.socket.borrow_mut().unwrap();
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let size = packet.finish();
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self.stack.send(&mut handle, &self.buffer[..size]).ok();
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}
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}
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}
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