410 lines
13 KiB
Rust
410 lines
13 KiB
Rust
#![no_std]
|
|
#![no_main]
|
|
#![feature(type_alias_impl_trait)]
|
|
#![feature(slice_split_once)]
|
|
use defmt_rtt as _; // global logger
|
|
|
|
use panic_probe as _;
|
|
use stm32f1xx_hal as _;
|
|
|
|
// same panicking *behavior* as `panic-probe` but doesn't print a panic message
|
|
// this prevents the panic message being printed *twice* when `defmt::panic` is invoked
|
|
#[defmt::panic_handler]
|
|
fn panic() -> ! {
|
|
cortex_m::asm::udf()
|
|
}
|
|
|
|
use rtic::app;
|
|
|
|
#[app(device = stm32f1xx_hal::pac, peripherals = true, dispatchers = [SPI3])]
|
|
mod app {
|
|
|
|
use cortex_m::asm::delay;
|
|
use rtic_monotonics::systick::*;
|
|
|
|
use stm32f1xx_hal::{
|
|
gpio::{self, gpioa, gpioc, Alternate, Output, PushPull},
|
|
pac,
|
|
pac::{RCC, TIM2, TIM3, TIM4},
|
|
prelude::*,
|
|
rcc::Enable,
|
|
rcc::Reset,
|
|
timer::{self, Channel, PwmHz, Tim4NoRemap},
|
|
};
|
|
|
|
use stm32f1xx_hal::usb::{Peripheral, UsbBus, UsbBusType};
|
|
use usb_device::prelude::*;
|
|
|
|
use heapless::Vec;
|
|
use postcard::{from_bytes_cobs, to_vec_cobs};
|
|
|
|
use cheapsdo_protocol::{*, DeviceMessage};
|
|
|
|
const USB_BUFFER_SIZE : usize = 64;
|
|
|
|
#[local]
|
|
struct Local {
|
|
board_led: gpioc::PC13<Output<PushPull>>,
|
|
tim2: TIM2,
|
|
tim3: TIM3,
|
|
pwm: PwmHz<TIM4, Tim4NoRemap, timer::Ch<0>, gpio::Pin<'B', 6, Alternate>>,
|
|
}
|
|
|
|
#[shared]
|
|
struct Shared {
|
|
usb_dev: UsbDevice<'static, UsbBusType>,
|
|
serial: usbd_serial::SerialPort<'static, UsbBusType>,
|
|
current_freq: f64,
|
|
short_avg: f64,
|
|
buffer: Vec<u8, USB_BUFFER_SIZE>,
|
|
}
|
|
|
|
const TARGET_FREQ: f64 = 10.0f64;
|
|
|
|
#[init]
|
|
fn init(cx: init::Context) -> (Shared, Local) {
|
|
let rcc = cx.device.RCC.constrain();
|
|
let mut flash = cx.device.FLASH.constrain();
|
|
|
|
let clocks = rcc
|
|
.cfgr
|
|
.use_hse(8.MHz())
|
|
.sysclk(48.MHz())
|
|
.pclk1(24.MHz())
|
|
.freeze(&mut flash.acr);
|
|
|
|
assert!(clocks.usbclk_valid());
|
|
defmt::info!("Clock Setup done");
|
|
|
|
// Initialize the systick interrupt & obtain the token to prove that we did
|
|
let systick_mono_token = rtic_monotonics::create_systick_token!();
|
|
Systick::start(cx.core.SYST, clocks.sysclk().to_Hz(), systick_mono_token);
|
|
|
|
let mut gpioc = cx.device.GPIOC.split();
|
|
|
|
// Configure gpio C pin 13 as a push-pull output. The `crh` register is passed to the function
|
|
// in order to configure the port. For pins 0-7, crl should be passed instead.
|
|
let board_led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
|
|
|
|
let mut afio = cx.device.AFIO.constrain();
|
|
let mut gpiob = cx.device.GPIOB.split();
|
|
let pwm_pin = gpiob.pb6.into_alternate_push_pull(&mut gpiob.crl);
|
|
let mut pwm =
|
|
cx.device
|
|
.TIM4
|
|
.pwm_hz::<Tim4NoRemap, _, _>(pwm_pin, &mut afio.mapr, 32.kHz(), &clocks);
|
|
pwm.enable(Channel::C1);
|
|
|
|
defmt::info!("PWM Setup done");
|
|
|
|
let tim2 = cx.device.TIM2;
|
|
unsafe {
|
|
let rcc = &*RCC::ptr();
|
|
TIM2::enable(rcc);
|
|
TIM2::reset(rcc);
|
|
}
|
|
|
|
// Enable external clocking
|
|
tim2.smcr.write(|w| {
|
|
w.etf().no_filter(); // No filter for to 10Mhz clock
|
|
w.etps().div1(); // No divider
|
|
w.etp().not_inverted(); // on rising edege at ETR pin
|
|
w.ece().enabled() // mode 2 (use ETR pin)
|
|
});
|
|
|
|
tim2.ccmr1_input().write(|w| {
|
|
w.cc1s().ti2(); // Input capture using TI2 input
|
|
w.ic1f().no_filter() // No filter on input capture input
|
|
//w.ic1psc().bits(0) // Disable prescaler, not safely implement by HAL yet
|
|
});
|
|
|
|
tim2.ccer.write(|w| {
|
|
w.cc1p().set_bit(); // Use rising edge on TI
|
|
w.cc1e().set_bit() // Enable input capture
|
|
});
|
|
|
|
tim2.cr2.write(|w| {
|
|
w.mms().update() // Trigger output on update/overflow
|
|
});
|
|
|
|
tim2.ccer.write(|w| {
|
|
w.cc1p().set_bit(); // Use rising edge on TI
|
|
w.cc1e().set_bit() // Enable input capture
|
|
});
|
|
|
|
tim2.cr2.write(|w| {
|
|
w.mms().update() // Trigger output on update/overflow
|
|
});
|
|
|
|
// Counting up to 10^7 should need 24 bits
|
|
// Clock tim2 by tim1s overflow to make a 32bit timer
|
|
let tim3 = cx.device.TIM3;
|
|
unsafe {
|
|
let rcc = &*RCC::ptr();
|
|
TIM3::enable(rcc);
|
|
TIM3::reset(rcc);
|
|
}
|
|
|
|
tim3.smcr.write(|w| {
|
|
w.ts().itr1(); // Trigger from internal trigger 1
|
|
w.sms().ext_clock_mode() // Use trigger as clock
|
|
});
|
|
|
|
tim3.ccmr1_input().write(|w| {
|
|
w.cc1s().ti1(); // Input capture using TI1 input
|
|
w.ic1f().no_filter() // No filter on input capture input
|
|
//w.ic1psc().bits(0) // Disable prescaler, not safely implement by HAL yet
|
|
});
|
|
|
|
tim3.ccer.write(|w| {
|
|
w.cc1p().set_bit(); // Use rising edge on TI
|
|
w.cc1e().set_bit() // Enable input capture
|
|
});
|
|
|
|
tim2.cr1.write(|w| w.cen().enabled());
|
|
tim3.cr1.write(|w| w.cen().enabled());
|
|
|
|
defmt::info!("Timer Setup done");
|
|
|
|
static mut USB_BUS: Option<usb_device::bus::UsbBusAllocator<UsbBusType>> = None;
|
|
|
|
let mut gpioa = cx.device.GPIOA.split();
|
|
|
|
let mut usb_dp = gpioa.pa12.into_push_pull_output(&mut gpioa.crh);
|
|
usb_dp.set_low();
|
|
delay(clocks.sysclk().raw() / 100);
|
|
|
|
let usb_dm = gpioa.pa11;
|
|
let usb_dp = usb_dp.into_floating_input(&mut gpioa.crh);
|
|
|
|
let usb = Peripheral {
|
|
usb: cx.device.USB,
|
|
pin_dm: usb_dm,
|
|
pin_dp: usb_dp,
|
|
};
|
|
|
|
unsafe {
|
|
USB_BUS.replace(UsbBus::new(usb));
|
|
}
|
|
|
|
let serial = usbd_serial::SerialPort::new(unsafe { USB_BUS.as_ref().unwrap() });
|
|
|
|
let usb_dev = UsbDeviceBuilder::new(
|
|
unsafe { USB_BUS.as_ref().unwrap() },
|
|
UsbVidPid(0x16c0, 0x27dd),
|
|
)
|
|
.manufacturer("Arbitrary Precision Instruments")
|
|
.product("cheapsdo")
|
|
.serial_number("1337")
|
|
.device_class(usbd_serial::USB_CLASS_CDC)
|
|
.build();
|
|
|
|
update_pwm::spawn().unwrap();
|
|
|
|
(
|
|
Shared {
|
|
serial,
|
|
usb_dev,
|
|
current_freq: 0.0f64,
|
|
short_avg: 0.0f64,
|
|
buffer: Vec::new(),
|
|
},
|
|
Local {
|
|
board_led,
|
|
tim2,
|
|
tim3,
|
|
pwm,
|
|
},
|
|
)
|
|
}
|
|
|
|
|
|
const WINDOW_LEN: usize = 100;
|
|
|
|
#[task(local=[tim2, tim3, pwm, board_led], shared=[current_freq, short_avg])]
|
|
async fn update_pwm(mut cx: update_pwm::Context) {
|
|
defmt::info!("Update Task started");
|
|
|
|
let tim2 = cx.local.tim2;
|
|
let tim3 = cx.local.tim3;
|
|
let pwm = cx.local.pwm;
|
|
let board_led = cx.local.board_led;
|
|
|
|
let max_pwm = pwm.get_max_duty() as i32;
|
|
let mut cur_pwm = max_pwm / 2;
|
|
|
|
// Inialize last_ic
|
|
while !tim2.sr.read().cc1if().bit_is_set() || !tim3.sr.read().cc1if().bit_is_set() {
|
|
Systick::delay(10.millis()).await;
|
|
}
|
|
let ic1 = tim2.ccr1().read().bits();
|
|
let ic2 = tim3.ccr1().read().bits();
|
|
|
|
let mut last_ic = ic2 << 16 | ic1;
|
|
|
|
loop {
|
|
let mut short_avg = 0.0f64;
|
|
let mut last_freq = 10.0f64;
|
|
|
|
let mut count = 0;
|
|
while count < WINDOW_LEN {
|
|
while !tim3.sr.read().cc1if().bit_is_set() || !tim3.sr.read().cc1if().bit_is_set() {
|
|
Systick::delay(10.millis()).await;
|
|
}
|
|
let ic1 = tim2.ccr1().read().bits();
|
|
let ic2 = tim3.ccr1().read().bits();
|
|
|
|
let sum_ic = ic2 << 16 | ic1;
|
|
|
|
let diff_ic = if sum_ic > last_ic {
|
|
sum_ic - last_ic
|
|
} else {
|
|
u32::MAX - last_ic + sum_ic
|
|
};
|
|
|
|
defmt::info!("ic1:\t{}", ic1);
|
|
defmt::info!("ic2:\t{}", ic2);
|
|
defmt::info!("sum_ic:\t{}", sum_ic);
|
|
defmt::info!("diff_ic:\t{}", diff_ic);
|
|
|
|
last_ic = sum_ic;
|
|
|
|
let freq = (diff_ic as f64) / 1_000_000f64;
|
|
defmt::info!("freq:\t{} MHz", freq);
|
|
|
|
let diff = freq - last_freq;
|
|
last_freq = freq;
|
|
if diff > 0.000_100 || diff < -0.000_100 {
|
|
defmt::info!("Out of range, dropping sample.");
|
|
continue;
|
|
}
|
|
|
|
cx.shared.current_freq.lock(|current_freq| {
|
|
*current_freq = freq;
|
|
});
|
|
|
|
short_avg += freq / WINDOW_LEN as f64;
|
|
|
|
count += 1;
|
|
board_led.toggle();
|
|
}
|
|
|
|
defmt::info!("short_avg:\t{} MHz", short_avg);
|
|
cx.shared.short_avg.lock(|avg| {
|
|
*avg = short_avg;
|
|
});
|
|
|
|
let diff = (TARGET_FREQ - short_avg) * 1_000_000.0;
|
|
if diff > 1.0 || diff < -1.0 {
|
|
cur_pwm += diff as i32 * 15;
|
|
} else if diff < -0.001 {
|
|
cur_pwm -= 1;
|
|
} else if diff > 0.001 {
|
|
cur_pwm += 1;
|
|
}
|
|
|
|
cur_pwm = if cur_pwm < 0 { 0 } else { cur_pwm };
|
|
cur_pwm = if cur_pwm > max_pwm { max_pwm } else { cur_pwm };
|
|
|
|
pwm.set_duty(Channel::C1, cur_pwm as u16);
|
|
defmt::info!("pwm:\t{}", cur_pwm);
|
|
|
|
Systick::delay(500.millis()).await;
|
|
}
|
|
}
|
|
|
|
#[task(binds = USB_HP_CAN_TX, shared = [usb_dev, serial, buffer, current_freq, short_avg])]
|
|
fn usb_tx(cx: usb_tx::Context) {
|
|
let mut usb_dev = cx.shared.usb_dev;
|
|
let mut serial = cx.shared.serial;
|
|
let mut buffer = cx.shared.buffer;
|
|
let mut current_freq = cx.shared.current_freq;
|
|
let mut short_avg = cx.shared.short_avg;
|
|
|
|
(
|
|
&mut usb_dev,
|
|
&mut serial,
|
|
&mut buffer,
|
|
&mut current_freq,
|
|
&mut short_avg,
|
|
)
|
|
.lock(|usb_dev, serial, buffer, current_freq, short_avg| {
|
|
usb_poll(usb_dev, serial, buffer, current_freq, short_avg);
|
|
});
|
|
}
|
|
|
|
#[task(binds = USB_LP_CAN_RX0, shared = [usb_dev, serial, buffer, current_freq, short_avg])]
|
|
fn usb_rx0(cx: usb_rx0::Context) {
|
|
let mut usb_dev = cx.shared.usb_dev;
|
|
let mut serial = cx.shared.serial;
|
|
let mut buffer = cx.shared.buffer;
|
|
let mut current_freq = cx.shared.current_freq;
|
|
let mut short_avg = cx.shared.short_avg;
|
|
|
|
(
|
|
&mut usb_dev,
|
|
&mut serial,
|
|
&mut buffer,
|
|
&mut current_freq,
|
|
&mut short_avg,
|
|
)
|
|
.lock(|usb_dev, serial, buffer, current_freq, short_avg| {
|
|
usb_poll(usb_dev, serial, buffer, current_freq, short_avg);
|
|
});
|
|
}
|
|
|
|
fn usb_poll<B: usb_device::bus::UsbBus>(
|
|
usb_dev: &mut usb_device::prelude::UsbDevice<'static, B>,
|
|
serial: &mut usbd_serial::SerialPort<'static, B>,
|
|
buffer: &mut Vec<u8, USB_BUFFER_SIZE>,
|
|
current_freq: &mut f64,
|
|
short_avg: &mut f64,
|
|
) {
|
|
if !usb_dev.poll(&mut [serial]) {
|
|
return;
|
|
}
|
|
|
|
let mut tmp = [0u8; 16];
|
|
match serial.read(&mut tmp) {
|
|
Ok(count) if count > 0 => {
|
|
if buffer.extend_from_slice(&tmp[0..count]).is_err() {
|
|
buffer.clear();
|
|
defmt::error!("Buffer overflow while waiting for the end of the packet");
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
loop {
|
|
if let Some((msg, rest)) = buffer.split_once(|&x| x == 0) {
|
|
let mut message = [0u8; 128];
|
|
message[0..msg.len()].clone_from_slice(msg);
|
|
let host_msg = from_bytes_cobs::<HostMessage>(&mut message);
|
|
|
|
match host_msg {
|
|
Ok(host_msg) => match host_msg {
|
|
HostMessage::RequestStatus => {
|
|
let device_msg = DeviceMessage::Status(StatusMessage{
|
|
measured_frequency: *current_freq,
|
|
average_frequency: *short_avg,
|
|
pwm: 0,
|
|
});
|
|
|
|
let bytes = to_vec_cobs::<DeviceMessage, USB_BUFFER_SIZE>(&device_msg).unwrap();
|
|
serial.write(bytes.as_slice()).unwrap();
|
|
},
|
|
HostMessage::SetPLLOutputs => {
|
|
defmt::error!("PLL output is not implemented yet")
|
|
}
|
|
}
|
|
Err(err) => defmt::error!("Unable to parse host message: {}", err),
|
|
};
|
|
|
|
*buffer = Vec::<u8, USB_BUFFER_SIZE>::from_slice(rest).unwrap();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|