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Adding framework for initial lockin demo

This commit is contained in:
Ryan Summers 2021-01-18 18:02:00 +01:00
parent 9d90d7b0d2
commit ac06f811ab
2 changed files with 39 additions and 54 deletions
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2
src/hardware/adc.rs
View File

@ -328,6 +328,7 @@ macro_rules! adc_input {
}
/// Enable the ADC DMA transfer sequence.
#[allow(dead_code)]
pub fn start(&mut self) {
self.transfer.start(|spi| {
spi.enable_dma_rx();
@ -345,6 +346,7 @@ macro_rules! adc_input {
///
/// # Returns
/// A reference to the underlying buffer that has been filled with ADC samples.
#[allow(dead_code)]
pub fn acquire_buffer(&mut self) -> &[u16; SAMPLE_BUFFER_SIZE] {
// Wait for the transfer to fully complete before continuing. Note: If a device
// hangs up, check that this conditional is passing correctly, as there is no

91
src/lockin.rs
View File

@ -21,12 +21,12 @@ const ADC_SAMPLE_TICKS: u16 = 256;
const SAMPLE_BUFFER_SIZE: usize = 8;
// A constant sinusoid to send on the DAC output.
const DAC_SEQUENCE: [8; i16] = [0, 0.707, 1, 0.707, 0, -0.707, -1, -0.707];
const DAC_SEQUENCE: [f32; 8] = [0.0, 0.707, 1.0, 0.707, 0.0, -0.707, -1.0, -0.707];
#[macro_use]
mod server;
mod hardware;
use hardware::{Adc0Input, Adc1Input, Dac0Output, Dac1Output, AFE0, AFE1};
use hardware::{Adc1Input, Dac0Output, Dac1Output, AFE0, AFE1};
use dsp::iir;
const SCALE: f32 = ((1 << 15) - 1) as f32;
@ -38,15 +38,15 @@ const TCP_TX_BUFFER_SIZE: usize = 8192;
const APP: () = {
struct Resources {
afes: (AFE0, AFE1),
adcs: (Adc0Input, Adc1Input),
adc1: Adc1Input,
dacs: (Dac0Output, Dac1Output),
net_interface: hardware::Ethernet,
// Format: iir_state[ch][coeff]
#[init([[0.; 5]; 2])]
iir_state: [iir::IIRState; 2],
#[init([[iir::IIR { ba: [1., 0., 0., 0., 0.], y_offset: 0., y_min: -SCALE - 1., y_max: SCALE }; IIR_CASCADE_LENGTH]; 2])]
iir_ch: [[iir::IIR; IIR_CASCADE_LENGTH]; 2],
#[init([0.; 5])]
iir_state: iir::IIRState,
#[init(iir::IIR { ba: [1., 0., 0., 0., 0.], y_offset: 0., y_min: -SCALE - 1., y_max: SCALE })]
iir: iir::IIR,
}
#[init]
@ -55,7 +55,6 @@ const APP: () = {
let (mut stabilizer, _pounder) = hardware::setup(c.core, c.device);
// Enable ADC/DAC events
stabilizer.adcs.0.start();
stabilizer.adcs.1.start();
stabilizer.dacs.0.start();
stabilizer.dacs.1.start();
@ -65,7 +64,7 @@ const APP: () = {
init::LateResources {
afes: stabilizer.afes,
adcs: stabilizer.adcs,
adc1: stabilizer.adcs.1,
dacs: stabilizer.dacs,
net_interface: stabilizer.net.interface,
}
@ -87,45 +86,41 @@ const APP: () = {
///
/// Because the ADC and DAC operate at the same rate, these two constraints actually implement
/// the same time bounds, meeting one also means the other is also met.
#[task(binds=DMA1_STR4, resources=[adcs, dacs, iir_state, iir_ch], priority=2)]
#[task(binds=DMA1_STR4, resources=[adc1, dacs, iir_state, iir], priority=2)]
fn process(c: process::Context) {
let adc_samples = [
c.resources.adcs.0.acquire_buffer(),
c.resources.adcs.1.acquire_buffer(),
];
let _adc_samples = c.resources.adc1.acquire_buffer();
let dac_samples = [
c.resources.dacs.0.acquire_buffer(),
c.resources.dacs.1.acquire_buffer(),
];
// DAC0 always generates a fixed sinusoidal output.
for value in DAC_SEQUENCE.iter() {
let y = value * i16::MAX;
for (i, value) in DAC_SEQUENCE.iter().enumerate() {
let y = value * i16::MAX as f32;
// Note(unsafe): The DAC_SEQUENCE values are guaranteed to be normalized.
let y = unsafe { y.to_int_unchecked::<i16>() };
// Convert to DAC code
dac_samples[0][sample] = y as u16 ^ 0x8000;
dac_samples[0][i] = y as u16 ^ 0x8000;
}
for channel in 0..adc_samples.len() {
for sample in 0..adc_samples[0].len() {
let x = f32::from(adc_samples[channel][sample] as i16);
let mut y = x;
for i in 0..c.resources.iir_state[channel].len() {
y = c.resources.iir_ch[channel][i]
.update(&mut c.resources.iir_state[channel][i], y);
}
// Note(unsafe): The filter limits ensure that the value is in range.
// The truncation introduces 1/2 LSB distortion.
let y = unsafe { y.to_int_unchecked::<i16>() };
// Convert to DAC code
dac_samples[channel][sample] = y as u16 ^ 0x8000;
}
// TODO: Introduce a "dummy" PLL here.
// TODO: Demodulate the ADC0 input samples with the dummy PLL.
// TODO: Filter the demodulated ADC values
// TODO: Compute phase of the last sample
// TODO: Place last sample phase into DAC1s output buffer.
let y = 0.0;
for value in dac_samples[1].iter_mut() {
*value = y as u16 ^ 0x8000
}
}
#[idle(resources=[net_interface, iir_state, iir_ch, afes])]
#[idle(resources=[net_interface, iir_state, iir, afes])]
fn idle(mut c: idle::Context) -> ! {
let mut socket_set_entries: [_; 8] = Default::default();
let mut sockets =
@ -177,10 +172,10 @@ const APP: () = {
let state = c.resources.iir_state.lock(|iir_state|
server::Status {
t: time,
x0: iir_state[0][0],
y0: iir_state[0][2],
x1: iir_state[1][0],
y1: iir_state[1][2],
x0: iir_state[0],
y0: iir_state[2],
x1: iir_state[0],
y1: iir_state[2],
});
Ok::<server::Status, ()>(state)
@ -190,29 +185,17 @@ const APP: () = {
],
modifiable_attributes: [
"stabilizer/iir0/state": server::IirRequest, (|req: server::IirRequest| {
c.resources.iir_ch.lock(|iir_ch| {
if req.channel > 1 {
"stabilizer/iir/state": server::IirRequest, (|req: server::IirRequest| {
c.resources.iir.lock(|iir| {
if req.channel >= 1 {
return Err(());
}
iir_ch[req.channel as usize] = req.iir;
*iir = req.iir;
Ok::<server::IirRequest, ()>(req)
})
}),
"stabilizer/iir1/state": server::IirRequest, (|req: server::IirRequest| {
c.resources.iir_ch.lock(|iir_ch| {
if req.channel > 1 {
return Err(());
}
iir_ch[req.channel as usize] = req.iir;
Ok::<server::IirRequest, ()>(req)
})
}),
}),
"stabilizer/afe0/gain": hardware::AfeGain, (|gain| {
c.resources.afes.0.set_gain(gain);
Ok::<(), ()>(())
@ -257,7 +240,7 @@ const APP: () = {
#[task(binds = SPI3, priority = 3)]
fn spi3(_: spi3::Context) {
panic!("ADC0 input overrun");
panic!("ADC1 input overrun");
}
#[task(binds = SPI4, priority = 3)]