aboutsummaryrefslogtreecommitdiffstats
path: root/sw/eval-clock-cw-tx/src/usb.rs
blob: b7e85360c58f54c17e182ce31aa554333c3ad9d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
use core::mem::MaybeUninit;
use core::fmt::Write;
use stm32f1xx_hal::{
    pac,
    pac::{interrupt, Interrupt},
    gpio,
    timer::{CounterHz, Event},
};
use stm32f1xx_hal::usb::{Peripheral, UsbBus, UsbBusType};
use usb_device::{bus::UsbBusAllocator, prelude::*};
use usbd_serial::{SerialPort, USB_CLASS_CDC};
use arrayvec::{ArrayVec, ArrayString};

/* Transmit 17.5 columns per second
 * With 14 lines per column, this gives 245 lines per second
 */
pub const TIMER_FREQ_HZ : u32 = 245;

const FELDHELL_PATTERN_LEN : usize = 16;
const MESSAGE_LEN : usize = 64;

static mut FELDHELL_TIMER: MaybeUninit<CounterHz<pac::TIM4>> = MaybeUninit::uninit();

static mut SHARED_USB: MaybeUninit<USBSharedData> = MaybeUninit::uninit();

static mut USB_BUS: Option<UsbBusAllocator<UsbBusType>> = None;
static mut USB_SERIAL: Option<usbd_serial::SerialPort<UsbBusType>> = None;
static mut USB_DEVICE: Option<UsbDevice<UsbBusType>> = None;


/* Commands
 * ========
 * Commands end with \n
 *
 * Switch to transmit:
 * tx
 *
 * Switch to receive:
 * rx
 *
 * Set frequency:
 * f10121000
 *
 * Append to transmit message
 * mThe message to transmit
 *
 * Clear transmit message
 * clear
 *
 * Set FELDHELL wide font
 * fontw
 *
 * Set FELDHELL narrow font
 * fontn
 *
 * Trigger a WSPR transmission
 * wspr
*/


#[derive(Clone, Copy)]
enum Font {
    Narrow,
    Wide,
}

// Shared between application and interrupt context
struct USBSharedData {
    incoming_buf: ArrayVec::<u8, MESSAGE_LEN>,
    feldhell_pattern: ArrayVec::<u16, FELDHELL_PATTERN_LEN>, // FELDHELL columns to transmit
}

pub fn enable_interrupts() {
    unsafe {
        pac::NVIC::unmask(Interrupt::USB_HP_CAN_TX);
        pac::NVIC::unmask(Interrupt::USB_LP_CAN_RX0);
        pac::NVIC::unmask(Interrupt::TIM4);
    }
}

#[derive(PartialEq, Clone, Copy)]
pub enum Transmit { None, FELDHELL, WSPR }

pub struct USBData {
    font : Font,
    frequency : Option<u32>,
    transmit : Transmit,

    current_str : ArrayVec::<u8, 96>,
    send_ix : usize,
}

impl USBData {
    pub fn new(
        timer4: CounterHz<pac::TIM4>,
        usb: pac::USB,
        pin_dm: gpio::gpioa::PA11<gpio::Input<gpio::Floating>>,
        pin_dp: gpio::gpioa::PA12<gpio::Input<gpio::Floating>>) -> USBData {

        let peripheral = Peripheral {
            usb,
            pin_dm,
            pin_dp,
        };

        {
            let timer = unsafe { &mut *FELDHELL_TIMER.as_mut_ptr() };
            *timer = timer4;
        }

        unsafe {
            USB_BUS = Some(UsbBus::new(peripheral));
            USB_SERIAL = Some(SerialPort::new(USB_BUS.as_ref().unwrap()));
            let usb_device = UsbDeviceBuilder::new(USB_BUS.as_ref().unwrap(), UsbVidPid(0x1d50, 0x5120)) // Openmoko Neo1973 serial
                .manufacturer("HB9EGM")
                .product("Beep Machine")
                .serial_number("1")
                .device_class(USB_CLASS_CDC)
                .build();
            USB_DEVICE = Some(usb_device);

            let shared_usb = &mut *SHARED_USB.as_mut_ptr();
            *shared_usb = USBSharedData {
                incoming_buf : ArrayVec::new(),
                feldhell_pattern : ArrayVec::new(),
            }
        }

        USBData {
            font: Font::Wide,
            frequency: None,
            transmit: Transmit::None,
            current_str: ArrayVec::new(),
            send_ix: 0,
        }
    }

    pub fn send_message(&mut self, message : &[u8]) {
        cortex_m::interrupt::free(|_cs| {
            let serial = unsafe { USB_SERIAL.as_mut().unwrap() };
            serial.write(message).ok();
        });
    }

    pub fn send_receive(&mut self) {
        self.send_message(b"Switch RX\n");
    }

    pub fn send_transmit(&mut self) {
        self.send_message(b"Switch TX\n");
    }

    pub fn handle(&mut self) {
        let in_message = cortex_m::interrupt::free(|_cs| {
            let shared_usb = unsafe { &mut *SHARED_USB.as_mut_ptr() };

            let mut message = ArrayString::<MESSAGE_LEN>::new();

            let mut split_at = None;
            for (i, c) in shared_usb.incoming_buf.iter().enumerate() {
                if *c == b'\n' {
                    split_at = Some(i);
                    break;
                }
            }

            match split_at {
                Some(i) if i+1 == shared_usb.incoming_buf.len() => {
                    write!(&mut message, "{}", core::str::from_utf8(&shared_usb.incoming_buf).unwrap()).ok();
                    shared_usb.incoming_buf.clear();
                }
                Some(i) => {
                    let (front, back) = shared_usb.incoming_buf.split_at(i+1);

                    write!(&mut message, "{}", core::str::from_utf8(front).unwrap()).ok();

                    let mut keep = ArrayVec::<u8, MESSAGE_LEN>::new();
                    keep.try_extend_from_slice(back).ok();

                    shared_usb.incoming_buf.clear();
                    shared_usb.incoming_buf.try_extend_from_slice(&keep).ok();
                }
                _ => { }
            };

            if message.len() > 0 {
                Some(message)
            }
            else {
                None
            }
        });

        let mut outgoing = ArrayVec::<u8, MESSAGE_LEN>::new();
        if let Some(m) = in_message {
            if m.as_str() == "tx\n" {
                outgoing.try_extend_from_slice(b"TX ok\n").ok();
                self.transmit = Transmit::FELDHELL;
            }
            else if m.as_str() == "rx\n" {
                outgoing.try_extend_from_slice(b"RX ok\n").ok();
                self.current_str.clear();
                self.transmit = Transmit::None;
            }
            else if m.chars().nth(0).unwrap() == 'm' {
                self.current_str.clear();
                for c in m.bytes().skip(1) {
                    self.current_str.push(c);
                }
                outgoing.try_extend_from_slice(b"m ok\n").ok();
            }
            else if m.as_str() == "fontw\n" {
                self.font = Font::Wide;
                outgoing.try_extend_from_slice(b"fontw ok\n").ok();
            }
            else if m.as_str() == "fontn\n" {
                self.font = Font::Narrow;
                outgoing.try_extend_from_slice(b"fontn ok\n").ok();
            }
            else if m.as_str() == "wspr\n" {
                outgoing.try_extend_from_slice(b"wspr ok\n").ok();
                self.transmit = Transmit::WSPR;
            }
            else if m.chars().nth(0).unwrap() == 'f' {
                let mut as_str = ArrayString::<MESSAGE_LEN>::new();

                for c in m.chars().skip(1) {
                    as_str.push(c);
                }

                match u32::from_str_radix(as_str.as_str().trim(), 10) {
                    Ok(val) => {
                        self.frequency = Some(val);
                        outgoing.try_extend_from_slice(b"f ok\n").ok();
                    }
                    _ => {
                        outgoing.try_extend_from_slice(b"F").ok();
                        outgoing.try_extend_from_slice(as_str.as_bytes()).ok();
                        outgoing.try_extend_from_slice(b" err\n").ok();
                    }
                }
            }
            else {
                outgoing.try_extend_from_slice(b"no\n").ok();
            }
        }

        let feldhell_pattern_length = cortex_m::interrupt::free(|_cs| {
            let serial = unsafe { USB_SERIAL.as_mut().unwrap() };
            serial.write(&outgoing).ok();

            let shared_usb = unsafe { &mut *SHARED_USB.as_mut_ptr() };
            shared_usb.feldhell_pattern.len()
        });

        if self.current_str.len() > 0 && feldhell_pattern_length < FELDHELL_PATTERN_LEN-8 {
            match self.current_str.get(self.send_ix) {
                Some(letter) => {
                    let fat = match self.font {
                        Font::Wide => true,
                        Font::Narrow => false,
                    };

                    match crate::feldhell_font::get_letter_by_columns(*letter, fat) {
                        Some(columns) => {
                            cortex_m::interrupt::free(|_cs| {
                                let shared_usb = unsafe { &mut *SHARED_USB.as_mut_ptr() };
                                shared_usb.feldhell_pattern.try_extend_from_slice(&columns).ok();
                            });

                        }
                        None => {}
                    }
                }
                None => {}
            }

            self.send_ix += 1;
            if self.send_ix >= self.current_str.len() {
                cortex_m::interrupt::free(|_cs| {
                    let serial = unsafe { USB_SERIAL.as_mut().unwrap() };
                    let mut outgoing = ArrayString::<16>::new();
                    write!(&mut outgoing, "FH sent {}\n", self.send_ix).ok();
                    serial.write(outgoing.as_bytes()).ok();
                });

                self.send_ix = 0;
                self.current_str.clear();
            }
        }
    }

    pub fn take_frequency(&mut self) -> Option<u32> { self.frequency.take() }

    pub fn transmit(&self) -> Transmit { self.transmit }

    pub fn clear_transmit(&mut self) {
        self.send_message(b"WSPR done\n");
        self.transmit = Transmit::None
    }
}

#[allow(non_snake_case)]
#[interrupt]
fn USB_HP_CAN_TX() {
    usb_interrupt();
}

#[allow(non_snake_case)]
#[interrupt]
fn USB_LP_CAN_RX0() {
    usb_interrupt();
}

fn usb_interrupt() {
    let usb_dev = unsafe { USB_DEVICE.as_mut().unwrap() };
    let serial = unsafe { USB_SERIAL.as_mut().unwrap() };

    if !usb_dev.poll(&mut [serial]) {
        return;
    }

    let mut buf = [0u8; MESSAGE_LEN];

    let shared_usb = unsafe { &mut *SHARED_USB.as_mut_ptr() };

    match serial.read(&mut buf) {
        Ok(count) if count > 0 => {
            if count > MESSAGE_LEN {
                panic!("illegal count");
            }
            shared_usb.incoming_buf.try_extend_from_slice(&buf[0..count]).ok();
        }
        _ => {}
    }
}

#[allow(non_snake_case)]
#[interrupt]
fn TIM4() {
    let timer = unsafe { &mut *FELDHELL_TIMER.as_mut_ptr() };
    timer.clear_interrupt(Event::Update);

    let shared_usb = unsafe { &mut *SHARED_USB.as_mut_ptr() };
    while shared_usb.feldhell_pattern.len() > 0 && shared_usb.feldhell_pattern.as_slice()[0] == 0 {
        shared_usb.feldhell_pattern.pop_at(0);
    }

    if shared_usb.feldhell_pattern.len() > 0 {
        let remove_first_element = {
            let pat = shared_usb.feldhell_pattern.as_mut_slice().first_mut().unwrap();

            let shared = unsafe { &mut *crate::SHARED.as_mut_ptr() };

            if shared.state.allow_feldhell_keying() && (*pat & 0b1) == 0b1 {
                shared.cw_key_out_n.set_low();
            }
            else {
                shared.cw_key_out_n.set_high();
            }

            *pat >>= 1;
            assert_ne!(*pat, 0);
            *pat == 0b1
        };

        if remove_first_element {
            shared_usb.feldhell_pattern.pop_at(0);
        }
    }
}