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Merge pull request #186 from vertigo-designs/feature/qspi-stream 

Adding support for Pounder DDS QSPI profile stream
This commit is contained in:
Robert Jördens 2020-12-07 18:57:48 +01:00 committed by GitHub
parent a62a3bcae8 c00ac46c2c
commit 85b8f12e5c
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 562 additions and 530 deletions
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269
ad9959/src/lib.rs
View File

@ -1,7 +1,7 @@
#![no_std]
use bit_field::BitField;
use embedded_hal::{blocking::delay::DelayMs, digital::v2::OutputPin};
use embedded_hal::{blocking::delay::DelayUs, digital::v2::OutputPin};
/// A device driver for the AD9959 direct digital synthesis (DDS) chip.
///
@ -13,12 +13,11 @@ use embedded_hal::{blocking::delay::DelayMs, digital::v2::OutputPin};
///
/// The chip supports a number of serial interfaces to improve data throughput, including normal,
/// dual, and quad SPI configurations.
pub struct Ad9959<INTERFACE, DELAY, UPDATE> {
pub struct Ad9959<INTERFACE> {
interface: INTERFACE,
delay: DELAY,
reference_clock_frequency: f32,
system_clock_multiplier: u8,
io_update: UPDATE,
communication_mode: Mode,
}
/// A trait that allows a HAL to provide a means of communicating with the AD9959.
@ -73,6 +72,7 @@ pub enum Register {
}
/// Specifies an output channel of the AD9959 DDS chip.
#[derive(Copy, Clone, PartialEq)]
pub enum Channel {
One = 0,
Two = 1,
@ -90,12 +90,7 @@ pub enum Error {
Frequency,
}
impl<PinE, INTERFACE, DELAY, UPDATE> Ad9959<INTERFACE, DELAY, UPDATE>
where
INTERFACE: Interface,
DELAY: DelayMs<u8>,
UPDATE: OutputPin<Error = PinE>,
{
impl<I: Interface> Ad9959<I> {
/// Construct and initialize the DDS.
///
/// Args:
@ -107,35 +102,31 @@ where
/// * `clock_frequency` - The clock frequency of the reference clock input.
/// * `multiplier` - The desired clock multiplier for the system clock. This multiplies
/// `clock_frequency` to generate the system clock.
pub fn new<RST>(
interface: INTERFACE,
reset_pin: &mut RST,
io_update: UPDATE,
delay: DELAY,
pub fn new(
interface: I,
mut reset_pin: impl OutputPin,
io_update: &mut impl OutputPin,
delay: &mut impl DelayUs<u8>,
desired_mode: Mode,
clock_frequency: f32,
multiplier: u8,
) -> Result<Self, Error>
where
RST: OutputPin,
{
) -> Result<Self, Error> {
let mut ad9959 = Ad9959 {
interface,
io_update,
delay,
reference_clock_frequency: clock_frequency,
system_clock_multiplier: 1,
communication_mode: desired_mode,
};
ad9959.io_update.set_low().or(Err(Error::Pin))?;
io_update.set_low().or(Err(Error::Pin))?;
// Reset the AD9959
reset_pin.set_high().or(Err(Error::Pin))?;
// Delay for a clock cycle to allow the device to reset.
ad9959
.delay
.delay_ms((1000.0 / clock_frequency as f32) as u8);
// Delay for at least 1 SYNC_CLK period for the reset to occur. The SYNC_CLK is guaranteed
// to be at least 250KHz (1/4 of 1MHz minimum REF_CLK). We use 5uS instead of 4uS to
// guarantee conformance with datasheet requirements.
delay.delay_us(5);
reset_pin.set_low().or(Err(Error::Pin))?;
@ -149,14 +140,29 @@ where
csr[0].set_bits(1..3, desired_mode as u8);
ad9959.write(Register::CSR, &csr)?;
// Latch the configuration registers to make them active.
ad9959.latch_configuration()?;
// Latch the new interface configuration.
io_update.set_high().or(Err(Error::Pin))?;
// Delay for at least 1 SYNC_CLK period for the update to occur. The SYNC_CLK is guaranteed
// to be at least 250KHz (1/4 of 1MHz minimum REF_CLK). We use 5uS instead of 4uS to
// guarantee conformance with datasheet requirements.
delay.delay_us(5);
io_update.set_low().or(Err(Error::Pin))?;
ad9959
.interface
.configure_mode(desired_mode)
.or(Err(Error::Interface))?;
// Empirical evidence indicates a delay is necessary here for the IO update to become
// active. This is likely due to needing to wait at least 1 clock cycle of the DDS for the
// interface update to occur.
// Delay for at least 1 SYNC_CLK period for the update to occur. The SYNC_CLK is guaranteed
// to be at least 250KHz (1/4 of 1MHz minimum REF_CLK). We use 5uS instead of 4uS to
// guarantee conformance with datasheet requirements.
delay.delay_us(5);
// Read back the CSR to ensure it specifies the mode correctly.
let mut updated_csr: [u8; 1] = [0];
ad9959.read(Register::CSR, &mut updated_csr)?;
@ -181,18 +187,6 @@ where
.or(Err(Error::Interface))
}
/// Latch the DDS configuration to ensure it is active on the output channels.
fn latch_configuration(&mut self) -> Result<(), Error> {
self.io_update.set_high().or(Err(Error::Pin))?;
// The SYNC_CLK is 1/4 the system clock frequency. The IO_UPDATE pin must be latched for one
// full SYNC_CLK pulse to register. For safety, we latch for 5 here.
self.delay
.delay_ms((5000.0 / self.system_clock_frequency()) as u8);
self.io_update.set_low().or(Err(Error::Pin))?;
Ok(())
}
/// Configure the internal system clock of the chip.
///
/// Arguments:
@ -205,7 +199,7 @@ where
&mut self,
reference_clock_frequency: f32,
multiplier: u8,
) -> Result<f64, Error> {
) -> Result<f32, Error> {
self.reference_clock_frequency = reference_clock_frequency;
if multiplier != 1 && !(4..=20).contains(&multiplier) {
@ -213,8 +207,8 @@ where
}
let frequency =
multiplier as f64 * self.reference_clock_frequency as f64;
if frequency > 500_000_000.0f64 {
multiplier as f32 * self.reference_clock_frequency as f32;
if frequency > 500_000_000.0f32 {
return Err(Error::Frequency);
}
@ -287,37 +281,9 @@ where
}
/// Get the current system clock frequency in Hz.
fn system_clock_frequency(&self) -> f64 {
self.system_clock_multiplier as f64
* self.reference_clock_frequency as f64
}
/// Enable an output channel.
pub fn enable_channel(&mut self, channel: Channel) -> Result<(), Error> {
let mut csr: [u8; 1] = [0];
self.read(Register::CSR, &mut csr)?;
csr[0].set_bit(channel as usize + 4, true);
self.write(Register::CSR, &csr)?;
Ok(())
}
/// Disable an output channel.
pub fn disable_channel(&mut self, channel: Channel) -> Result<(), Error> {
let mut csr: [u8; 1] = [0];
self.read(Register::CSR, &mut csr)?;
csr[0].set_bit(channel as usize + 4, false);
self.write(Register::CSR, &csr)?;
Ok(())
}
/// Determine if an output channel is enabled.
pub fn is_enabled(&mut self, channel: Channel) -> Result<bool, Error> {
let mut csr: [u8; 1] = [0; 1];
self.read(Register::CSR, &mut csr)?;
Ok(csr[0].get_bit(channel as usize + 4))
fn system_clock_frequency(&self) -> f32 {
self.system_clock_multiplier as f32
* self.reference_clock_frequency as f32
}
/// Update an output channel configuration register.
@ -334,22 +300,16 @@ where
) -> Result<(), Error> {
// Disable all other outputs so that we can update the configuration register of only the
// specified channel.
let mut csr: [u8; 1] = [0];
self.read(Register::CSR, &mut csr)?;
let csr: u8 = *0x00_u8
.set_bits(1..=2, self.communication_mode as u8)
.set_bit(4 + channel as usize, true);
let mut new_csr = csr;
new_csr[0].set_bits(4..8, 0);
new_csr[0].set_bit(4 + channel as usize, true);
self.write(Register::CSR, &new_csr)?;
self.interface
.write(Register::CSR as u8, &[csr])
.map_err(|_| Error::Interface)?;
self.write(register, &data)?;
// Latch the configuration and restore the previous CSR. Note that the re-enable of the
// channel happens immediately, so the CSR update does not need to be latched.
self.latch_configuration()?;
self.write(Register::CSR, &csr)?;
Ok(())
}
@ -494,8 +454,8 @@ where
pub fn set_frequency(
&mut self,
channel: Channel,
frequency: f64,
) -> Result<f64, Error> {
frequency: f32,
) -> Result<f32, Error> {
if frequency < 0.0 || frequency > self.system_clock_frequency() {
return Err(Error::Bounds);
}
@ -503,15 +463,15 @@ where
// The function for channel frequency is `f_out = FTW * f_s / 2^32`, where FTW is the
// frequency tuning word and f_s is the system clock rate.
let tuning_word: u32 =
((frequency as f64 / self.system_clock_frequency())
* 1u64.wrapping_shl(32) as f64) as u32;
((frequency as f32 / self.system_clock_frequency())
* 1u64.wrapping_shl(32) as f32) as u32;
self.modify_channel(
channel,
Register::CFTW0,
&tuning_word.to_be_bytes(),
)?;
Ok((tuning_word as f64 / 1u64.wrapping_shl(32) as f64)
Ok((tuning_word as f32 / 1u64.wrapping_shl(32) as f32)
* self.system_clock_frequency())
}
@ -522,14 +482,135 @@ where
///
/// Returns:
/// The frequency of the channel in Hz.
pub fn get_frequency(&mut self, channel: Channel) -> Result<f64, Error> {
pub fn get_frequency(&mut self, channel: Channel) -> Result<f32, Error> {
// Read the frequency tuning word for the channel.
let mut tuning_word: [u8; 4] = [0; 4];
self.read_channel(channel, Register::CFTW0, &mut tuning_word)?;
let tuning_word = u32::from_be_bytes(tuning_word);
// Convert the tuning word into a frequency.
Ok(tuning_word as f64 * self.system_clock_frequency()
/ (1u64 << 32) as f64)
Ok((tuning_word as f32 * self.system_clock_frequency())
/ (1u64 << 32) as f32)
}
/// Finalize DDS configuration
///
/// # Note
/// This is intended for when the DDS profiles will be written as a stream of data to the DDS.
///
/// # Returns
/// (I, config) where `I` is the interface to the DDS and `config` is the frozen `DdsConfig`.
pub fn freeze(self) -> (I, DdsConfig) {
let config = DdsConfig {
mode: self.communication_mode,
};
(self.interface, config)
}
}
/// The frozen DDS configuration.
pub struct DdsConfig {
mode: Mode,
}
impl DdsConfig {
/// Create a serializer that can be used for generating a serialized DDS profile for writing to
/// a QSPI stream.
pub fn builder(&self) -> ProfileSerializer {
ProfileSerializer::new(self.mode)
}
}
/// Represents a means of serializing a DDS profile for writing to a stream.
pub struct ProfileSerializer {
data: [u8; 16],
index: usize,
mode: Mode,
}
impl ProfileSerializer {
/// Construct a new serializer.
///
/// # Args
/// * `mode` - The communication mode of the DDS.
fn new(mode: Mode) -> Self {
Self {
mode,
data: [0; 16],
index: 0,
}
}
/// Update a number of channels with the requested profile.
///
/// # Args
/// * `channels` - A list of channels to apply the configuration to.
/// * `ftw` - If provided, indicates a frequency tuning word for the channels.
/// * `pow` - If provided, indicates a phase offset word for the channels.
/// * `acr` - If provided, indicates the amplitude control register for the channels.
pub fn update_channels(
&mut self,
channels: &[Channel],
ftw: Option<u32>,
pow: Option<u16>,
acr: Option<u16>,
) {
let mut csr: u8 = *0u8.set_bits(1..3, self.mode as u8);
for channel in channels.iter() {
csr.set_bit(4 + *channel as usize, true);
}
self.add_write(Register::CSR, &[csr]);
if let Some(ftw) = ftw {
self.add_write(Register::CFTW0, &ftw.to_be_bytes());
}
if let Some(pow) = pow {
self.add_write(Register::CPOW0, &pow.to_be_bytes());
}
if let Some(acr) = acr {
self.add_write(Register::ACR, &acr.to_be_bytes());
}
}
/// Add a register write to the serialization data.
fn add_write(&mut self, register: Register, value: &[u8]) {
let data = &mut self.data[self.index..];
data[0] = register as u8;
data[1..][..value.len()].copy_from_slice(value);
self.index += value.len() + 1;
}
/// Get the serialized profile as a slice of 32-bit words.
///
/// # Note
/// The serialized profile will be padded to the next 32-bit word boundary by adding dummy
/// writes to the CSR or LSRR registers.
///
/// # Returns
/// A slice of `u32` words representing the serialized profile.
pub fn finalize<'a>(&'a mut self) -> &[u32] {
// Pad the buffer to 32-bit alignment by adding dummy writes to CSR and LSRR.
let padding = 4 - (self.index % 4);
match padding {
0 => {}
1 => {
// For a pad size of 1, we have to pad with 5 bytes to align things.
self.add_write(Register::CSR, &[(self.mode as u8) << 1]);
self.add_write(Register::LSRR, &[0, 0, 0]);
}
2 => self.add_write(Register::CSR, &[(self.mode as u8) << 1]),
3 => self.add_write(Register::LSRR, &[0, 0, 0]),
_ => unreachable!(),
}
unsafe {
core::slice::from_raw_parts::<'a, u32>(
&self.data as *const _ as *const u32,
self.index / 4,
)
}
}
}

111
pounder_test.py
View File

@ -1,111 +0,0 @@
#!/usr/bin/python3
"""
Description: Test Stabilizer communication and DDS configuration.
Author: Ryan Summers
"""
import socket
import json
HOST = '10.0.16.99'
PORT = 1235
def do_request(s, request):
""" Perform a request with the Stabilizer.
Args:
s: The socket to the stabilizer.
request: The request to transmit.
Returns:
The received response object.
"""
# Transform the value field.
request['value'] = json.dumps(request['value'], separators=[',', ':']).replace('"', "'")
data = (json.dumps(request, separators=[',', ':']) + '\n').encode('ascii')
s.send(data)
response = b''
while not response.endswith(b'\n'):
response += s.recv(1024)
# Decode the value array
response = json.loads(response.decode('ascii'))
response['value'] = response['value'].replace("'", '"')
response['value'] = json.loads(response['value'])
return response
def read_attribute(s, attribute_name):
""" Read an attribute on the Stabilizer device.
Args:
s: The socket to the stabilizer.
attribute_name: The name of the endpoint to write to (the attribute name).
Returns:
The value of the attribute. May be a string or a dictionary.
"""
request = {
"req": "Read",
"attribute": attribute_name,
"value": "",
}
response = do_request(s, request)
if 'code' not in response or response['code'] != 200:
raise Exception(f'Failed to read {attribute_name}: {response}')
return response['value']
def write_attribute(s, attribute_name, attribute_value):
""" Write an attribute on the Stabilizer device.
Args:
s: The socket to the stabilizer.
attribute_name: The name of the endpoint to write to (the attribute name).
attribute_value: The value to write to the attribute. May be a string or a dictionary.
"""
request = {
"req": "Write",
"attribute": attribute_name,
"value": attribute_value,
}
response = do_request(s, request)
if 'code' not in response or response['code'] != 200:
raise Exception(f'Failed to write {attribute_name}: {response}')
def main():
""" Main program entry point. """
with socket.socket() as s:
# Connect to the stabilizer.
s.connect((HOST, PORT))
# A sample configuration for an output channel.
channel_config = {
'attenuation': 31.5,
'parameters': {
'phase_offset': 0.5,
'frequency': 100.0e6,
'amplitude': 0.2,
'enabled': True,
}
}
# Configure OUT0 and read it back.
write_attribute(s, "pounder/out0", channel_config)
print('Pounder OUT0: ', read_attribute(s, "pounder/out0"))
print('Pounder IN1: ', read_attribute(s, "pounder/in1"))
print('Pounder OUT1: ', read_attribute(s, "pounder/out1"))
if __name__ == '__main__':
main()

132
src/hrtimer.rs Normal file
View File

@ -0,0 +1,132 @@
///! The HRTimer (High Resolution Timer) is used to generate IO_Update pulses to the Pounder DDS.
use crate::hal;
use hal::rcc::{rec, CoreClocks, ResetEnable};
/// A HRTimer output channel.
pub enum Channel {
One,
Two,
}
/// The high resolution timer. Currently, only Timer E is supported.
pub struct HighResTimerE {
master: hal::stm32::HRTIM_MASTER,
timer: hal::stm32::HRTIM_TIME,
common: hal::stm32::HRTIM_COMMON,
clocks: CoreClocks,
}
impl HighResTimerE {
/// Construct a new high resolution timer for generating IO_update signals.
pub fn new(
timer_regs: hal::stm32::HRTIM_TIME,
master_regs: hal::stm32::HRTIM_MASTER,
common_regs: hal::stm32::HRTIM_COMMON,
clocks: CoreClocks,
prec: rec::Hrtim,
) -> Self {
prec.reset().enable();
Self {
master: master_regs,
timer: timer_regs,
common: common_regs,
clocks,
}
}
/// Configure the timer to operate in single-shot mode.
///
/// # Note
/// This will configure the timer to generate a single pulse on an output channel. The timer
/// will only count up once and must be `trigger()`'d after / configured.
///
/// The output will be asserted from `set_offset` to `set_offset` + `set_duration` in the count.
///
/// # Args
/// * `channel` - The timer output channel to configure.
/// * `set_duration` - The duration that the output should be asserted for.
/// * `set_offset` - The first time at which the output should be asserted.
pub fn configure_single_shot(
&mut self,
channel: Channel,
set_duration: f32,
set_offset: f32,
) {
// Disable the timer before configuration.
self.master.mcr.modify(|_, w| w.tecen().clear_bit());
// Configure the desired timer for single shot mode with set and reset of the specified
// channel at the desired durations. The HRTIM is on APB2 (D2 domain), and the kernel clock
// is the APB bus clock.
let minimum_duration = set_duration + set_offset;
let source_frequency: u32 = self.clocks.timy_ker_ck().0;
let source_cycles =
(minimum_duration * source_frequency as f32) as u32 + 1;
// Determine the clock divider, which may be 1, 2, or 4. We will choose a clock divider that
// allows us the highest resolution per tick, so lower dividers are favored.
let setting: u8 = if source_cycles < 0xFFDF {
1
} else if (source_cycles / 2) < 0xFFDF {
2
} else if (source_cycles / 4) < 0xFFDF {
3
} else {
panic!("Unattainable timing parameters!");
};
let divider = 1 << (setting - 1);
// The period register must be greater than or equal to 3 cycles.
let period = (source_cycles / divider as u32) as u16;
assert!(period > 2);
// We now have the prescaler and the period registers. Configure the timer.
// Note(unsafe): The prescaler is guaranteed to be greater than or equal to 4 (minimum
// allowed value) due to the addition. The setting is always 1, 2, or 3, which represents
// all valid values.
self.timer
.timecr
.modify(|_, w| unsafe { w.ck_pscx().bits(setting + 4) });
// Note(unsafe): The period register is guaranteed to be a 16-bit value, which will fit in
// this register.
self.timer.perer.write(|w| unsafe { w.perx().bits(period) });
// Configure the comparator 1 level.
let offset = (set_offset * source_frequency as f32) as u16;
// Note(unsafe): The offset is always a 16-bit value, so is always valid for values >= 3, as
// specified by the datasheet.
assert!(offset >= 3);
self.timer
.cmp1er
.write(|w| unsafe { w.cmp1x().bits(offset) });
// Configure the set/reset signals.
// Set on compare with CMP1, reset upon reaching PER
match channel {
Channel::One => {
self.timer.sete1r.write(|w| w.cmp1().set_bit());
self.timer.rste1r.write(|w| w.per().set_bit());
self.common.oenr.write(|w| w.te1oen().set_bit());
}
Channel::Two => {
self.timer.sete2r.write(|w| w.cmp1().set_bit());
self.timer.rste2r.write(|w| w.per().set_bit());
self.common.oenr.write(|w| w.te2oen().set_bit());
}
}
// Enable the timer now that it is configured.
self.master.mcr.modify(|_, w| w.tecen().set_bit());
}
/// Generate a single trigger of the timer to start the output pulse generation.
pub fn trigger(&mut self) {
// Generate a reset event to force the timer to start counting.
self.common.cr2.write(|w| w.terst().set_bit());
}
}

198
src/main.rs
View File

@ -71,6 +71,7 @@ mod afe;
mod dac;
mod design_parameters;
mod eeprom;
mod hrtimer;
mod pounder;
mod sampling_timer;
mod server;
@ -78,6 +79,7 @@ mod server;
use adc::{Adc0Input, Adc1Input};
use dac::{Dac0Output, Dac1Output};
use dsp::iir;
use pounder::DdsOutput;
#[cfg(not(feature = "semihosting"))]
fn init_log() {}
@ -200,6 +202,8 @@ const APP: () = {
eeprom_i2c: hal::i2c::I2c<hal::stm32::I2C2>,
dds_output: Option<DdsOutput>,
// Note: It appears that rustfmt generates a format that GDB cannot recognize, which
// results in GDB breakpoints being set improperly.
#[rustfmt::skip]
@ -211,7 +215,7 @@ const APP: () = {
eth_mac: ethernet::phy::LAN8742A<ethernet::EthernetMAC>,
mac_addr: net::wire::EthernetAddress,
pounder: Option<pounder::PounderDevices<asm_delay::AsmDelay>>,
pounder: Option<pounder::PounderDevices>,
// Format: iir_state[ch][cascade-no][coeff]
#[init([[[0.; 5]; IIR_CASCADE_LENGTH]; 2])]
@ -259,7 +263,7 @@ const APP: () = {
let gpiod = dp.GPIOD.split(ccdr.peripheral.GPIOD);
let gpioe = dp.GPIOE.split(ccdr.peripheral.GPIOE);
let gpiof = dp.GPIOF.split(ccdr.peripheral.GPIOF);
let gpiog = dp.GPIOG.split(ccdr.peripheral.GPIOG);
let mut gpiog = dp.GPIOG.split(ccdr.peripheral.GPIOG);
let afe0 = {
let a0_pin = gpiof.pf2.into_push_pull_output();
@ -465,8 +469,9 @@ const APP: () = {
// Measure the Pounder PGOOD output to detect if pounder is present on Stabilizer.
let pounder_pgood = gpiob.pb13.into_pull_down_input();
delay.delay_ms(2u8);
let pounder_devices = if pounder_pgood.is_high().unwrap() {
let ad9959 = {
let (pounder_devices, dds_output) = if pounder_pgood.is_high().unwrap()
{
let mut ad9959 = {
let qspi_interface = {
// Instantiate the QUADSPI pins and peripheral interface.
let qspi_pins = {
@ -502,33 +507,32 @@ const APP: () = {
let qspi = hal::qspi::Qspi::bank2(
dp.QUADSPI,
qspi_pins,
10.mhz(),
40.mhz(),
&ccdr.clocks,
ccdr.peripheral.QSPI,
);
pounder::QspiInterface::new(qspi).unwrap()
};
let mut reset_pin = gpioa.pa0.into_push_pull_output();
let io_update = gpiog.pg7.into_push_pull_output();
let reset_pin = gpioa.pa0.into_push_pull_output();
let mut io_update = gpiog.pg7.into_push_pull_output();
let asm_delay = {
let frequency_hz = ccdr.clocks.c_ck().0;
asm_delay::AsmDelay::new(asm_delay::bitrate::Hertz(
frequency_hz,
))
};
ad9959::Ad9959::new(
let ad9959 = ad9959::Ad9959::new(
qspi_interface,
&mut reset_pin,
io_update,
asm_delay,
reset_pin,
&mut io_update,
&mut delay,
ad9959::Mode::FourBitSerial,
100_000_000f32,
100_000_000_f32,
5,
)
.unwrap()
.unwrap();
// Return IO_Update
gpiog.pg7 = io_update.into_analog();
ad9959
};
let io_expander = {
@ -598,20 +602,64 @@ const APP: () = {
let adc1_in_p = gpiof.pf11.into_analog();
let adc2_in_p = gpiof.pf14.into_analog();
Some(
pounder::PounderDevices::new(
io_expander,
ad9959,
spi,
adc1,
adc2,
adc1_in_p,
adc2_in_p,
)
.unwrap(),
let pounder_devices = pounder::PounderDevices::new(
io_expander,
&mut ad9959,
spi,
adc1,
adc2,
adc1_in_p,
adc2_in_p,
)
.unwrap();
let dds_output = {
let io_update_trigger = {
let _io_update = gpiog
.pg7
.into_alternate_af2()
.set_speed(hal::gpio::Speed::VeryHigh);
// Configure the IO_Update signal for the DDS.
let mut hrtimer = hrtimer::HighResTimerE::new(
dp.HRTIM_TIME,
dp.HRTIM_MASTER,
dp.HRTIM_COMMON,
ccdr.clocks,
ccdr.peripheral.HRTIM,
);
// IO_Update should be latched for 4 SYNC_CLK cycles after the QSPI profile
// write. With pounder SYNC_CLK running at 100MHz (1/4 of the pounder reference
// clock of 400MHz), this corresponds to 40ns. To accomodate rounding errors, we
// use 50ns instead.
//
// Profile writes are always 16 bytes, with 2 cycles required per byte, coming
// out to a total of 32 QSPI clock cycles. The QSPI is configured for 40MHz, so
// this comes out to an offset of 800nS. We use 900ns to be safe - note that the
// timer is triggered after the QSPI write, which can take approximately 120nS,
// so there is additional margin.
hrtimer.configure_single_shot(
hrtimer::Channel::Two,
50_e-9,
900_e-9,
);
// Ensure that we have enough time for an IO-update every sample.
assert!(
1.0 / (1000 * SAMPLE_FREQUENCY_KHZ) as f32 > 900_e-9
);
hrtimer
};
let (qspi, config) = ad9959.freeze();
DdsOutput::new(qspi, io_update_trigger, config)
};
(Some(pounder_devices), Some(dds_output))
} else {
None
(None, None)
};
let mut eeprom_i2c = {
@ -741,7 +789,7 @@ const APP: () = {
adcs,
dacs,
dds_output,
pounder: pounder_devices,
eeprom_i2c,
@ -751,7 +799,7 @@ const APP: () = {
}
}
#[task(binds=DMA1_STR3, resources=[adcs, dacs, iir_state, iir_ch], priority=2)]
#[task(binds=DMA1_STR3, resources=[adcs, dacs, iir_state, iir_ch, dds_output], priority=2)]
fn process(c: process::Context) {
let adc_samples = [
c.resources.adcs.0.acquire_buffer(),
@ -777,6 +825,18 @@ const APP: () = {
dac_samples[channel][sample] = y as u16 ^ 0x8000;
}
}
if let Some(dds_output) = c.resources.dds_output {
let builder = dds_output.builder().update_channels(
&[pounder::Channel::Out0.into()],
Some(u32::MAX / 4),
None,
None,
);
builder.write_profile();
}
let [dac0, dac1] = dac_samples;
c.resources.dacs.0.release_buffer(dac0);
c.resources.dacs.1.release_buffer(dac1);
@ -856,41 +916,7 @@ const APP: () = {
Ok::<server::Status, ()>(state)
}),
"stabilizer/afe0/gain": (|| c.resources.afes.0.get_gain()),
"stabilizer/afe1/gain": (|| c.resources.afes.1.get_gain()),
"pounder/in0": (|| {
match c.resources.pounder {
Some(pounder) =>
pounder.get_input_channel_state(pounder::Channel::In0),
_ => Err(pounder::Error::Access),
}
}),
"pounder/in1": (|| {
match c.resources.pounder {
Some(pounder) =>
pounder.get_input_channel_state(pounder::Channel::In1),
_ => Err(pounder::Error::Access),
}
}),
"pounder/out0": (|| {
match c.resources.pounder {
Some(pounder) =>
pounder.get_output_channel_state(pounder::Channel::Out0),
_ => Err(pounder::Error::Access),
}
}),
"pounder/out1": (|| {
match c.resources.pounder {
Some(pounder) =>
pounder.get_output_channel_state(pounder::Channel::Out1),
_ => Err(pounder::Error::Access),
}
}),
"pounder/dds/clock": (|| {
match c.resources.pounder {
Some(pounder) => pounder.get_dds_clock_config(),
_ => Err(pounder::Error::Access),
}
})
"stabilizer/afe1/gain": (|| c.resources.afes.1.get_gain())
],
modifiable_attributes: [
@ -938,40 +964,6 @@ const APP: () = {
Ok::<server::IirRequest, ()>(req)
})
}),
"pounder/in0": pounder::ChannelState, (|state| {
match c.resources.pounder {
Some(pounder) =>
pounder.set_channel_state(pounder::Channel::In0, state),
_ => Err(pounder::Error::Access),
}
}),
"pounder/in1": pounder::ChannelState, (|state| {
match c.resources.pounder {
Some(pounder) =>
pounder.set_channel_state(pounder::Channel::In1, state),
_ => Err(pounder::Error::Access),
}
}),
"pounder/out0": pounder::ChannelState, (|state| {
match c.resources.pounder {
Some(pounder) =>
pounder.set_channel_state(pounder::Channel::Out0, state),
_ => Err(pounder::Error::Access),
}
}),
"pounder/out1": pounder::ChannelState, (|state| {
match c.resources.pounder {
Some(pounder) =>
pounder.set_channel_state(pounder::Channel::Out1, state),
_ => Err(pounder::Error::Access),
}
}),
"pounder/dds/clock": pounder::DdsClockConfig, (|config| {
match c.resources.pounder {
Some(pounder) => pounder.configure_dds_clock(config),
_ => Err(pounder::Error::Access),
}
}),
"stabilizer/afe0/gain": afe::Gain, (|gain| {
c.resources.afes.0.set_gain(gain);
Ok::<(), ()>(())

111
src/pounder/dds_output.rs Normal file
View File

@ -0,0 +1,111 @@
///! The DdsOutput is used as an output stream to the pounder DDS.
use super::QspiInterface;
use crate::hrtimer::HighResTimerE;
use ad9959::{Channel, DdsConfig, ProfileSerializer};
use stm32h7xx_hal as hal;
/// The DDS profile update stream.
pub struct DdsOutput {
_qspi: QspiInterface,
io_update_trigger: HighResTimerE,
config: DdsConfig,
}
impl DdsOutput {
/// Construct a new DDS output stream.
///
/// # Note
/// It is assumed that the QSPI stream and the IO_Update trigger timer have been configured in a
/// way such that the profile has sufficient time to be written before the IO_Update signal is
/// generated.
///
/// # Args
/// * `qspi` - The QSPI interface to the run the stream on.
/// * `io_update_trigger` - The HighResTimerE used to generate IO_Update pulses.
/// * `dds_config` - The frozen DDS configuration.
pub fn new(
mut qspi: QspiInterface,
io_update_trigger: HighResTimerE,
dds_config: DdsConfig,
) -> Self {
qspi.start_stream().unwrap();
Self {
config: dds_config,
_qspi: qspi,
io_update_trigger,
}
}
/// Get a builder for serializing a Pounder DDS profile.
pub fn builder(&mut self) -> ProfileBuilder {
let builder = self.config.builder();
ProfileBuilder {
dds_stream: self,
serializer: builder,
}
}
/// Write a profile to the stream.
///
/// # Note:
/// If a profile of more than 4 words is provided, it is possible that the QSPI interface will
/// stall execution.
///
/// # Args
/// * `profile` - The serialized DDS profile to write.
fn write_profile(&mut self, profile: &[u32]) {
// Note(unsafe): We own the QSPI interface, so it is safe to access the registers in a raw
// fashion.
let regs = unsafe { &*hal::stm32::QUADSPI::ptr() };
if regs.sr.read().flevel() != 0 {
warn!("QSPI stalling")
}
for word in profile.iter() {
// Note(unsafe): We are writing to the SPI TX FIFO in a raw manner for performance. This
// is safe because we know the data register is a valid address to write to.
unsafe {
core::ptr::write_volatile(
&regs.dr as *const _ as *mut u32,
*word,
);
}
}
// Trigger the IO_update signal generating timer to asynchronous create the IO_Update pulse.
self.io_update_trigger.trigger();
}
}
/// A temporary builder for serializing and writing profiles.
pub struct ProfileBuilder<'a> {
dds_stream: &'a mut DdsOutput,
serializer: ProfileSerializer,
}
impl<'a> ProfileBuilder<'a> {
/// Update a number of channels with the provided configuration
///
/// # Args
/// * `channels` - A list of channels to apply the configuration to.
/// * `ftw` - If provided, indicates a frequency tuning word for the channels.
/// * `pow` - If provided, indicates a phase offset word for the channels.
/// * `acr` - If provided, indicates the amplitude control register for the channels.
pub fn update_channels(
mut self,
channels: &[Channel],
ftw: Option<u32>,
pow: Option<u16>,
acr: Option<u16>,
) -> Self {
self.serializer.update_channels(channels, ftw, pow, acr);
self
}
/// Write the profile to the DDS asynchronously.
pub fn write_profile(mut self) {
let profile = self.serializer.finalize();
self.dds_stream.write_profile(profile);
}
}

271
src/pounder/mod.rs
View File

@ -1,8 +1,11 @@
use serde::{Deserialize, Serialize};
mod attenuators;
mod dds_output;
mod rf_power;
pub use dds_output::DdsOutput;
use super::hal;
use attenuators::AttenuatorInterface;
@ -33,6 +36,7 @@ pub enum Error {
}
#[derive(Debug, Copy, Clone)]
#[allow(dead_code)]
pub enum Channel {
In0,
In1,
@ -43,7 +47,7 @@ pub enum Channel {
#[derive(Serialize, Deserialize, Copy, Clone, Debug)]
pub struct DdsChannelState {
pub phase_offset: f32,
pub frequency: f64,
pub frequency: f32,
pub amplitude: f32,
pub enabled: bool,
}
@ -90,6 +94,7 @@ impl Into<ad9959::Channel> for Channel {
pub struct QspiInterface {
pub qspi: hal::qspi::Qspi,
mode: ad9959::Mode,
streaming: bool,
}
impl QspiInterface {
@ -106,8 +111,31 @@ impl QspiInterface {
Ok(Self {
qspi,
mode: ad9959::Mode::SingleBitTwoWire,
streaming: false,
})
}
pub fn start_stream(&mut self) -> Result<(), Error> {
if self.qspi.is_busy() {
return Err(Error::Qspi);
}
// Configure QSPI for infinite transaction mode using only a data phase (no instruction or
// address).
let qspi_regs = unsafe { &*hal::stm32::QUADSPI::ptr() };
qspi_regs.fcr.modify(|_, w| w.ctcf().set_bit());
unsafe {
qspi_regs.dlr.write(|w| w.dl().bits(0xFFFF_FFFF));
qspi_regs.ccr.modify(|_, w| {
w.imode().bits(0).fmode().bits(0).admode().bits(0)
});
}
self.streaming = true;
Ok(())
}
}
impl ad9959::Interface for QspiInterface {
@ -205,13 +233,18 @@ impl ad9959::Interface for QspiInterface {
.map_err(|_| Error::Qspi)
}
ad9959::Mode::FourBitSerial => {
self.qspi.write(addr, &data).map_err(|_| Error::Qspi)
if self.streaming {
Err(Error::Qspi)
} else {
self.qspi.write(addr, data).map_err(|_| Error::Qspi)?;
Ok(())
}
}
_ => Err(Error::Qspi),
}
}
fn read(&mut self, addr: u8, mut dest: &mut [u8]) -> Result<(), Error> {
fn read(&mut self, addr: u8, dest: &mut [u8]) -> Result<(), Error> {
if (addr & 0x80) != 0 {
return Err(Error::InvalidAddress);
}
@ -222,18 +255,13 @@ impl ad9959::Interface for QspiInterface {
}
self.qspi
.read(0x80_u8 | addr, &mut dest)
.read(0x80_u8 | addr, dest)
.map_err(|_| Error::Qspi)
}
}
/// A structure containing implementation for Pounder hardware.
pub struct PounderDevices<DELAY> {
pub ad9959: ad9959::Ad9959<
QspiInterface,
DELAY,
hal::gpio::gpiog::PG7<hal::gpio::Output<hal::gpio::PushPull>>,
>,
pub struct PounderDevices {
mcp23017: mcp23017::MCP23017<hal::i2c::I2c<hal::stm32::I2C1>>,
attenuator_spi: hal::spi::Spi<hal::stm32::SPI1, hal::spi::Enabled, u8>,
adc1: hal::adc::Adc<hal::stm32::ADC1, hal::adc::Enabled>,
@ -242,10 +270,7 @@ pub struct PounderDevices<DELAY> {
adc2_in_p: hal::gpio::gpiof::PF14<hal::gpio::Analog>,
}
impl<DELAY> PounderDevices<DELAY>
where
DELAY: embedded_hal::blocking::delay::DelayMs<u8>,
{
impl PounderDevices {
/// Construct and initialize pounder-specific hardware.
///
/// Args:
@ -257,11 +282,7 @@ where
/// * `adc2_in_p` - The input channel for the RF power measurement on IN1.
pub fn new(
mcp23017: mcp23017::MCP23017<hal::i2c::I2c<hal::stm32::I2C1>>,
ad9959: ad9959::Ad9959<
QspiInterface,
DELAY,
hal::gpio::gpiog::PG7<hal::gpio::Output<hal::gpio::PushPull>>,
>,
ad9959: &mut ad9959::Ad9959<QspiInterface>,
attenuator_spi: hal::spi::Spi<hal::stm32::SPI1, hal::spi::Enabled, u8>,
adc1: hal::adc::Adc<hal::stm32::ADC1, hal::adc::Enabled>,
adc2: hal::adc::Adc<hal::stm32::ADC2, hal::adc::Enabled>,
@ -270,7 +291,6 @@ where
) -> Result<Self, Error> {
let mut devices = Self {
mcp23017,
ad9959,
attenuator_spi,
adc1,
adc2,
@ -295,212 +315,19 @@ where
.map_err(|_| Error::I2c)?;
// Select the on-board clock with a 4x prescaler (400MHz).
devices.select_onboard_clock(4u8)?;
devices
.mcp23017
.digital_write(EXT_CLK_SEL_PIN, false)
.map_err(|_| Error::I2c)?;
ad9959
.configure_system_clock(100_000_000f32, 4)
.map_err(|_| Error::Dds)?;
Ok(devices)
}
/// Select the an external for the DDS reference clock source.
///
/// Args:
/// * `frequency` - The frequency of the external clock source.
/// * `multiplier` - The multiplier of the reference clock to use in the DDS.
fn select_external_clock(
&mut self,
frequency: f32,
prescaler: u8,
) -> Result<(), Error> {
self.mcp23017
.digital_write(EXT_CLK_SEL_PIN, true)
.map_err(|_| Error::I2c)?;
self.ad9959
.configure_system_clock(frequency, prescaler)
.map_err(|_| Error::Dds)?;
Ok(())
}
/// Select the onboard oscillator for the DDS reference clock source.
///
/// Args:
/// * `multiplier` - The multiplier of the reference clock to use in the DDS.
fn select_onboard_clock(&mut self, multiplier: u8) -> Result<(), Error> {
self.mcp23017
.digital_write(EXT_CLK_SEL_PIN, false)
.map_err(|_| Error::I2c)?;
self.ad9959
.configure_system_clock(100_000_000f32, multiplier)
.map_err(|_| Error::Dds)?;
Ok(())
}
/// Configure the Pounder DDS clock.
///
/// Args:
/// * `config` - The configuration of the DDS clock desired.
pub fn configure_dds_clock(
&mut self,
config: DdsClockConfig,
) -> Result<(), Error> {
if config.external_clock {
self.select_external_clock(
config.reference_clock,
config.multiplier,
)
} else {
self.select_onboard_clock(config.multiplier)
}
}
/// Get the pounder DDS clock configuration
///
/// Returns:
/// The current pounder DDS clock configuration.
pub fn get_dds_clock_config(&mut self) -> Result<DdsClockConfig, Error> {
let external_clock = self
.mcp23017
.digital_read(EXT_CLK_SEL_PIN)
.map_err(|_| Error::I2c)?;
let multiplier = self
.ad9959
.get_reference_clock_multiplier()
.map_err(|_| Error::Dds)?;
let reference_clock = self.ad9959.get_reference_clock_frequency();
Ok(DdsClockConfig {
multiplier,
reference_clock,
external_clock,
})
}
/// Get the state of a Pounder input channel.
///
/// Args:
/// * `channel` - The pounder channel to get the state of. Must be an input channel
///
/// Returns:
/// The read-back channel input state.
pub fn get_input_channel_state(
&mut self,
channel: Channel,
) -> Result<InputChannelState, Error> {
match channel {
Channel::In0 | Channel::In1 => {
let channel_state = self.get_dds_channel_state(channel)?;
let attenuation = self.get_attenuation(channel)?;
let power = self.measure_power(channel)?;
Ok(InputChannelState {
attenuation,
power,
mixer: channel_state,
})
}
_ => Err(Error::InvalidChannel),
}
}
/// Get the state of a DDS channel.
///
/// Args:
/// * `channel` - The pounder channel to get the state of.
///
/// Returns:
/// The read-back channel state.
fn get_dds_channel_state(
&mut self,
channel: Channel,
) -> Result<DdsChannelState, Error> {
let frequency = self
.ad9959
.get_frequency(channel.into())
.map_err(|_| Error::Dds)?;
let phase_offset = self
.ad9959
.get_phase(channel.into())
.map_err(|_| Error::Dds)?;
let amplitude = self
.ad9959
.get_amplitude(channel.into())
.map_err(|_| Error::Dds)?;
let enabled = self
.ad9959
.is_enabled(channel.into())
.map_err(|_| Error::Dds)?;
Ok(DdsChannelState {
phase_offset,
frequency,
amplitude,
enabled,
})
}
/// Get the state of a DDS output channel.
///
/// Args:
/// * `channel` - The pounder channel to get the output state of. Must be an output channel.
///
/// Returns:
/// The read-back output channel state.
pub fn get_output_channel_state(
&mut self,
channel: Channel,
) -> Result<OutputChannelState, Error> {
match channel {
Channel::Out0 | Channel::Out1 => {
let channel_state = self.get_dds_channel_state(channel)?;
let attenuation = self.get_attenuation(channel)?;
Ok(OutputChannelState {
attenuation,
channel: channel_state,
})
}
_ => Err(Error::InvalidChannel),
}
}
/// Configure a DDS channel.
///
/// Args:
/// * `channel` - The pounder channel to configure.
/// * `state` - The state to configure the channel for.
pub fn set_channel_state(
&mut self,
channel: Channel,
state: ChannelState,
) -> Result<(), Error> {
self.ad9959
.set_frequency(channel.into(), state.parameters.frequency)
.map_err(|_| Error::Dds)?;
self.ad9959
.set_phase(channel.into(), state.parameters.phase_offset)
.map_err(|_| Error::Dds)?;
self.ad9959
.set_amplitude(channel.into(), state.parameters.amplitude)
.map_err(|_| Error::Dds)?;
if state.parameters.enabled {
self.ad9959
.enable_channel(channel.into())
.map_err(|_| Error::Dds)?;
} else {
self.ad9959
.disable_channel(channel.into())
.map_err(|_| Error::Dds)?;
}
self.set_attenuation(channel, state.attenuation)?;
Ok(())
}
}
impl<DELAY> AttenuatorInterface for PounderDevices<DELAY> {
impl AttenuatorInterface for PounderDevices {
/// Reset all of the attenuators to a power-on default state.
fn reset_attenuators(&mut self) -> Result<(), Error> {
self.mcp23017
@ -572,7 +399,7 @@ impl<DELAY> AttenuatorInterface for PounderDevices<DELAY> {
}
}
impl<DELAY> PowerMeasurementInterface for PounderDevices<DELAY> {
impl PowerMeasurementInterface for PounderDevices {
/// Sample an ADC channel.
///
/// Args: