main.c 18.2 KB
Newer Older
Damien's avatar
Damien committed
1
2
#include <stm32f4xx.h>
#include <stm32f4xx_rcc.h>
3
4
#include <stm32f4xx_gpio.h>
#include <stm_misc.h>
Damien's avatar
Damien committed
5
6
#include "std.h"

7
#include "misc.h"
8
#include "systick.h"
9
#include "led.h"
10
#include "lcd.h"
11
#include "storage.h"
Damien's avatar
Damien committed
12

13
static void impl02_c_version() {
Damien's avatar
Damien committed
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
    int x = 0;
    while (x < 400) {
        int y = 0;
        while (y < 400) {
            volatile int z = 0;
            while (z < 400) {
                z = z + 1;
            }
            y = y + 1;
        }
        x = x + 1;
    }
}

void set_bits(__IO uint32_t *addr, uint32_t shift, uint32_t mask, uint32_t value) {
    uint32_t x = *addr;
    x &= ~(mask << shift);
    x |= (value << shift);
    *addr = x;
}

void gpio_init() {
    RCC->AHB1ENR |= RCC_AHB1ENR_CCMDATARAMEN | RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOAEN;
}

39
/*
Damien's avatar
Damien committed
40
41
42
43
44
void gpio_pin_af(GPIO_TypeDef *gpio, uint32_t pin, uint32_t af) {
    // set the AF bits for the given pin
    // pins 0-7 use low word of AFR, pins 8-15 use high word
    set_bits(&gpio->AFR[pin >> 3], 4 * (pin & 0x07), 0xf, af);
}
45
*/
Damien's avatar
Damien committed
46

47
static void mma_init() {
48
    // XXX
Damien's avatar
Damien committed
49
    RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // enable I2C1
50
51
52
53
    //gpio_pin_init(GPIOB, 6 /* B6 is SCL */, 2 /* AF mode */, 1 /* open drain output */, 1 /* 25 MHz */, 0 /* no pull up or pull down */);
    //gpio_pin_init(GPIOB, 7 /* B7 is SDA */, 2 /* AF mode */, 1 /* open drain output */, 1 /* 25 MHz */, 0 /* no pull up or pull down */);
    //gpio_pin_af(GPIOB, 6, 4 /* AF 4 for I2C1 */);
    //gpio_pin_af(GPIOB, 7, 4 /* AF 4 for I2C1 */);
Damien's avatar
Damien committed
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77

    // get clock speeds
    RCC_ClocksTypeDef rcc_clocks;
    RCC_GetClocksFreq(&rcc_clocks);

    // disable the I2C peripheral before we configure it
    I2C1->CR1 &= ~I2C_CR1_PE;

    // program peripheral input clock
    I2C1->CR2 = 4; // no interrupts; 4 MHz (hopefully!) (could go up to 42MHz)

    // configure clock control reg
    uint32_t freq = rcc_clocks.PCLK1_Frequency / (100000 << 1); // want 100kHz, this is the formula for freq
    I2C1->CCR = freq; // standard mode (speed), freq calculated as above

    // configure rise time reg
    I2C1->TRISE = (rcc_clocks.PCLK1_Frequency / 1000000) + 1; // formula for trise, gives maximum rise time

    // enable the I2C peripheral
    I2C1->CR1 |= I2C_CR1_PE;

    // set START bit in CR1 to generate a start cond!
}

78
static uint32_t i2c_get_sr() {
Damien's avatar
Damien committed
79
80
81
82
83
84
    // must read SR1 first, then SR2, as the read can clear some flags
    uint32_t sr1 = I2C1->SR1;
    uint32_t sr2 = I2C1->SR2;
    return (sr2 << 16) | sr1;
}

85
static void mma_restart(uint8_t addr, int write) {
Damien's avatar
Damien committed
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
    // send start condition
    I2C1->CR1 |= I2C_CR1_START;

    // wait for BUSY, MSL and SB --> Slave has acknowledged start condition
    while ((i2c_get_sr() & 0x00030001) != 0x00030001) {
    }

    if (write) {
        // send address and write bit
        I2C1->DR = (addr << 1) | 0;
        // wait for BUSY, MSL, ADDR, TXE and TRA
        while ((i2c_get_sr() & 0x00070082) != 0x00070082) {
        }
    } else {
        // send address and read bit
        I2C1->DR = (addr << 1) | 1;
        // wait for BUSY, MSL and ADDR flags
        while ((i2c_get_sr() & 0x00030002) != 0x00030002) {
        }
    }
}

108
static void mma_start(uint8_t addr, int write) {
Damien's avatar
Damien committed
109
110
111
112
113
114
115
116
    // wait until I2C is not busy
    while (I2C1->SR2 & I2C_SR2_BUSY) {
    }

    // do rest of start
    mma_restart(addr, write);
}

117
static void mma_send_byte(uint8_t data) {
Damien's avatar
Damien committed
118
119
120
121
122
123
124
125
126
127
128
129
    // send byte
    I2C1->DR = data;
    // wait for TRA, BUSY, MSL, TXE and BTF (byte transmitted)
    int timeout = 1000000;
    while ((i2c_get_sr() & 0x00070084) != 0x00070084) {
        if (timeout-- <= 0) {
            printf("mma_send_byte timed out!\n");
            break;
        }
    }
}

130
static uint8_t mma_read_ack() {
Damien's avatar
Damien committed
131
132
133
134
135
136
137
138
139
140
    // enable ACK of received byte
    I2C1->CR1 |= I2C_CR1_ACK;
    // wait for BUSY, MSL and RXNE (byte received)
    while ((i2c_get_sr() & 0x00030040) != 0x00030040) {
    }
    // read and return data
    uint8_t data = I2C1->DR;
    return data;
}

141
static uint8_t mma_read_nack() {
Damien's avatar
Damien committed
142
143
144
145
146
147
148
149
150
151
152
153
    // disable ACK of received byte (to indicate end of receiving)
    I2C1->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ACK);
    // last byte should apparently also generate a stop condition
    I2C1->CR1 |= I2C_CR1_STOP;
    // wait for BUSY, MSL and RXNE (byte received)
    while ((i2c_get_sr() & 0x00030040) != 0x00030040) {
    }
    // read and return data
    uint8_t data = I2C1->DR;
    return data;
}

154
static void mma_stop() {
Damien's avatar
Damien committed
155
156
157
158
159
    // send stop condition
    I2C1->CR1 |= I2C_CR1_STOP;
}

#define PYB_USRSW_PORT (GPIOA)
160
#define PYB_USRSW_PIN (GPIO_Pin_13)
Damien's avatar
Damien committed
161
162
163

void sw_init() {
    // make it an input with pull-up
164
165
166
167
168
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = PYB_USRSW_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(PYB_USRSW_PORT, &GPIO_InitStructure);
Damien's avatar
Damien committed
169
170
171
}

int sw_get() {
172
    if (PYB_USRSW_PORT->IDR & PYB_USRSW_PIN) {
Damien's avatar
Damien committed
173
174
175
176
177
178
179
180
181
182
183
184
185
        // pulled high, so switch is not pressed
        return 0;
    } else {
        // pulled low, so switch is pressed
        return 1;
    }
}

void __fatal_error(const char *msg) {
    lcd_print_strn("\nFATAL ERROR:\n", 14);
    lcd_print_strn(msg, strlen(msg));

    for (;;) {
186
187
        led_state(PYB_LED_R1, 1);
        led_state(PYB_LED_R2, 0);
188
        sys_tick_delay_ms(150);
189
190
        led_state(PYB_LED_R1, 0);
        led_state(PYB_LED_R2, 1);
191
        sys_tick_delay_ms(150);
Damien's avatar
Damien committed
192
193
194
195
196
197
198
199
200
201
202
    }
}

#include "misc.h"
#include "lexer.h"
#include "mpyconfig.h"
#include "parse.h"
#include "compile.h"
#include "runtime.h"

py_obj_t pyb_delay(py_obj_t count) {
203
    sys_tick_delay_ms(rt_get_int(count));
Damien's avatar
Damien committed
204
205
206
207
    return py_const_none;
}

py_obj_t pyb_led(py_obj_t state) {
208
    led_state(PYB_LED_G1, rt_is_true(state));
Damien's avatar
Damien committed
209
210
211
212
213
214
215
216
217
218
219
220
221
222
    return state;
}

py_obj_t pyb_sw() {
    if (sw_get()) {
        return py_const_true;
    } else {
        return py_const_false;
    }
}

#include "ff.h"
FATFS fatfs0;

223
#include "nlr.h"
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
void g(uint i) {
    printf("g:%d\n", i);
    if (i & 1) {
        nlr_jump((void*)(42 + i));
    }
}
void f() {
    nlr_buf_t nlr;
    int i;
    for (i = 0; i < 4; i++) {
        printf("f:loop:%d:%p\n", i, &nlr);
        if (nlr_push(&nlr) == 0) {
            // normal
            //printf("a:%p:%p %p %p %u\n", &nlr, nlr.ip, nlr.sp, nlr.prev, nlr.ret_val);
            g(i);
            printf("f:lp:%d:nrm\n", i);
            nlr_pop();
        } else {
            // nlr
            //printf("b:%p:%p %p %p %u\n", &nlr, nlr.ip, nlr.sp, nlr.prev, nlr.ret_val);
            printf("f:lp:%d:nlr:%d\n", i, (int)nlr.ret_val);
        }
    }
}
void nlr_test() {
    f(1);
}
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
void fatality() {
    led_state(PYB_LED_R1, 1);
    led_state(PYB_LED_G1, 1);
    led_state(PYB_LED_R2, 1);
    led_state(PYB_LED_G2, 1);
}

static const char *fresh_boot_py =
"# boot.py -- run on boot-up\n"
"# can run arbitrary Python, but best to keep it minimal\n"
"\n"
"pyb.source_dir('/src')\n"
"pyb.main('main.py')\n"
"#pyb.usb_usr('VCP')\n"
"#pyb.usb_msd(True, 'dual partition')\n"
"#pyb.flush_cache(False)\n"
"#pyb.error_log('error.txt')\n"
;

// get lots of info about the board
static void board_info() {
    // get and print clock speeds
    // SYSCLK=168MHz, HCLK=168MHz, PCLK1=42MHz, PCLK2=84MHz
    {
        RCC_ClocksTypeDef rcc_clocks;
        RCC_GetClocksFreq(&rcc_clocks);
        printf("S=%lu\nH=%lu\nP1=%lu\nP2=%lu\n", rcc_clocks.SYSCLK_Frequency, rcc_clocks.HCLK_Frequency, rcc_clocks.PCLK1_Frequency, rcc_clocks.PCLK2_Frequency);
    }

    // to print info about memory
    {
        extern void *_sidata;
        extern void *_sdata;
        extern void *_edata;
        extern void *_sbss;
        extern void *_ebss;
        extern void *_estack;
        extern void *_etext;
        extern void *_heap_start;
        printf("_sidata=%p\n", &_sidata);
        printf("_sdata=%p\n", &_sdata);
        printf("_edata=%p\n", &_edata);
        printf("_sbss=%p\n", &_sbss);
        printf("_ebss=%p\n", &_ebss);
        printf("_estack=%p\n", &_estack);
        printf("_etext=%p\n", &_etext);
        printf("_heap_start=%p\n", &_heap_start);
    }

    // free space on flash
    {
        DWORD nclst;
        FATFS *fatfs;
        f_getfree("0:", &nclst, &fatfs);
        printf("free=%u\n", (uint)(nclst * fatfs->csize * 512));
    }
}

Damien's avatar
Damien committed
313
int main() {
314
    // TODO disable JTAG
Damien's avatar
Damien committed
315

316
317
    // basic sub-system init
    sys_tick_init();
Damien's avatar
Damien committed
318
319
    gpio_init();
    led_init();
320
321
322
323
324

    // turn on LED to indicate bootup
    led_state(PYB_LED_G1, 1);

    // more sub-system init
Damien's avatar
Damien committed
325
326
    sw_init();
    lcd_init();
327
    storage_init();
Damien's avatar
Damien committed
328

329
330
331
332
    // Python init
    qstr_init();
    rt_init();

Damien's avatar
Damien committed
333
334
335
    // print a message
    printf(" micro py board\n");

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
    // local filesystem init
    {
        // try to mount the flash
        FRESULT res = f_mount(&fatfs0, "0:", 1);
        if (res == FR_OK) {
            // mount sucessful
        } else if (res == FR_NO_FILESYSTEM) {
            // no filesystem, so create a fresh one

            // LED on to indicate creation of LFS
            led_state(PYB_LED_R2, 1);
            uint32_t stc = sys_tick_counter;

            res = f_mkfs("0:", 0, 0);
            if (res == FR_OK) {
                // success creating fresh LFS
            } else {
                __fatal_error("could not create LFS");
            }

            // keep LED on for at least 100ms
            sys_tick_wait_at_least(stc, 100);
            led_state(PYB_LED_R2, 0);
        } else {
            __fatal_error("could not access LFS");
        }
Damien's avatar
Damien committed
362
363
    }

364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
    // make sure we have a /boot.py
    {
        FILINFO fno;
        FRESULT res = f_stat("0:/boot.py", &fno);
        if (res == FR_OK) {
            if (fno.fattrib & AM_DIR) {
                // exists as a directory
                // TODO handle this case
                // see http://elm-chan.org/fsw/ff/img/app2.c for a "rm -rf" implementation
            } else {
                // exists as a file, good!
            }
        } else {
            // doesn't exist, create fresh file

            // LED on to indicate creation of boot.py
            led_state(PYB_LED_R2, 1);
            uint32_t stc = sys_tick_counter;

            FIL fp;
            f_open(&fp, "0:/boot.py", FA_WRITE | FA_CREATE_ALWAYS);
            UINT n;
            f_write(&fp, fresh_boot_py, sizeof(fresh_boot_py), &n);
            // TODO check we could write n bytes
            f_close(&fp);

            // keep LED on for at least 100ms
            sys_tick_wait_at_least(stc, 100);
            led_state(PYB_LED_R2, 0);
        }
    }

    // run /boot.py
    if (0) {
        FIL fp;
        f_open(&fp, "0:/boot.py", FA_READ);
        UINT n;
        char buf[20];
        f_read(&fp, buf, 18, &n);
        buf[n + 1] = 0;
        printf("read %d\n%s", n, buf);
        f_close(&fp);
    }

    // turn boot-up LED off
409
    led_state(PYB_LED_G1, 0);
Damien's avatar
Damien committed
410
411

    /*
412
413
414
415
416
    for (;;) {
        led_state(PYB_LED_G2, 1);
        sys_tick_wait_at_least(sys_tick_counter, 500);
        led_state(PYB_LED_G2, 0);
        sys_tick_wait_at_least(sys_tick_counter, 500);
Damien's avatar
Damien committed
417
418
419
    }
    */

420
    // USB
421
    if (0) {
422
423
424
425
        void usb_init();
        usb_init();
    }

Damien's avatar
Damien committed
426
    //printf("init;al=%u\n", m_get_total_bytes_allocated()); // 1600, due to qstr_init
427
    //sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
428

429
    #if 0
Damien's avatar
Damien committed
430
    // Python!
431
    if (0) {
Damien's avatar
Damien committed
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
        //const char *pysrc = "def f():\n  x=x+1\nprint(42)\n";
        const char *pysrc =
            // impl01.py
            /*
            "x = 0\n"
            "while x < 400:\n"
            "    y = 0\n"
            "    while y < 400:\n"
            "        z = 0\n"
            "        while z < 400:\n"
            "            z = z + 1\n"
            "        y = y + 1\n"
            "    x = x + 1\n";
            */
            // impl02.py
447
            /*
Damien's avatar
Damien committed
448
449
450
451
452
453
454
455
456
457
458
459
            "#@micropython.native\n"
            "def f():\n"
            "    x = 0\n"
            "    while x < 400:\n"
            "        y = 0\n"
            "        while y < 400:\n"
            "            z = 0\n"
            "            while z < 400:\n"
            "                z = z + 1\n"
            "            y = y + 1\n"
            "        x = x + 1\n"
            "f()\n";
460
            */
Damien's avatar
Damien committed
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
            /*
            "print('in python!')\n"
            "x = 0\n"
            "while x < 4:\n"
            "    pyb_led(True)\n"
            "    pyb_delay(201)\n"
            "    pyb_led(False)\n"
            "    pyb_delay(201)\n"
            "    x = x + 1\n"
            "print('press me!')\n"
            "while True:\n"
            "    pyb_led(pyb_sw())\n";
            */
            /*
            // impl16.py
            "@micropython.asm_thumb\n"
            "def delay(r0):\n"
            "    b(loop_entry)\n"
            "    label(loop1)\n"
            "    movw(r1, 55999)\n"
            "    label(loop2)\n"
            "    subs(r1, r1, 1)\n"
            "    cmp(r1, 0)\n"
            "    bgt(loop2)\n"
            "    subs(r0, r0, 1)\n"
            "    label(loop_entry)\n"
            "    cmp(r0, 0)\n"
            "    bgt(loop1)\n"
            "print('in python!')\n"
            "@micropython.native\n"
            "def flash(n):\n"
            "    x = 0\n"
            "    while x < n:\n"
            "        pyb_led(True)\n"
            "        delay(249)\n"
            "        pyb_led(False)\n"
            "        delay(249)\n"
            "        x = x + 1\n"
            "flash(20)\n";
            */
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
            // impl18.py
            /*
            "# basic exceptions\n"
            "x = 1\n"
            "try:\n"
            "    x.a()\n"
            "except:\n"
            "    print(x)\n";
            */
            // impl19.py
            "# for loop\n"
            "def f():\n"
            "    for x in range(400):\n"
            "        for y in range(400):\n"
            "            for z in range(400):\n"
            "                pass\n"
            "f()\n";
Damien's avatar
Damien committed
518
519
520
521
522
523
524

        py_lexer_t *lex = py_lexer_from_str_len("<>", pysrc, strlen(pysrc), false);

        if (0) {
            while (!py_lexer_is_kind(lex, PY_TOKEN_END)) {
                py_token_show(py_lexer_cur(lex));
                py_lexer_to_next(lex);
525
                sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
526
527
528
529
            }
        } else {
            // nalloc=1740;6340;6836 -> 140;4600;496 bytes for lexer, parser, compiler
            printf("lex; al=%u\n", m_get_total_bytes_allocated());
530
            sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
531
532
533
            py_parse_node_t pn = py_parse(lex, 0);
            //printf("----------------\n");
            printf("pars;al=%u\n", m_get_total_bytes_allocated());
534
            sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
535
            //parse_node_show(pn, 0);
536
            py_compile(pn, false);
Damien's avatar
Damien committed
537
            printf("comp;al=%u\n", m_get_total_bytes_allocated());
538
            sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
539
540
541
542
543
544
545
546
547
548
549

            if (1) {
                // execute it!

                // add some functions to the python namespace
                rt_store_name(qstr_from_str_static("pyb_delay"), rt_make_function_1(pyb_delay));
                rt_store_name(qstr_from_str_static("pyb_led"), rt_make_function_1(pyb_led));
                rt_store_name(qstr_from_str_static("pyb_sw"), rt_make_function_0(pyb_sw));

                py_obj_t module_fun = rt_make_function_from_id(1);

550
                // flash once
551
                led_state(PYB_LED_G1, 1);
552
                sys_tick_delay_ms(100);
553
                led_state(PYB_LED_G1, 0);
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569

                nlr_buf_t nlr;
                if (nlr_push(&nlr) == 0) {
                    py_obj_t ret = rt_call_function_0(module_fun);
                    printf("done! got: ");
                    py_obj_print(ret);
                    printf("\n");
                    nlr_pop();
                } else {
                    // uncaught exception
                    printf("exception: ");
                    py_obj_print((py_obj_t)nlr.ret_val);
                    printf("\n");
                }

                // flash once
570
                led_state(PYB_LED_G1, 1);
571
                sys_tick_delay_ms(100);
572
                led_state(PYB_LED_G1, 0);
Damien's avatar
Damien committed
573

574
                sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
575
                printf("nalloc=%u\n", m_get_total_bytes_allocated());
576
                sys_tick_delay_ms(1000);
Damien's avatar
Damien committed
577
578
579
580
581
582
583
            }
        }
    }
    #endif

    // benchmark C version of impl02.py
    if (0) {
584
        led_state(PYB_LED_G1, 1);
585
        sys_tick_delay_ms(100);
586
        led_state(PYB_LED_G1, 0);
Damien's avatar
Damien committed
587
        impl02_c_version();
588
        led_state(PYB_LED_G1, 1);
589
        sys_tick_delay_ms(100);
590
        led_state(PYB_LED_G1, 0);
Damien's avatar
Damien committed
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
    }

    // MMA testing
    if (0) {
        printf("1");
        mma_init();
        printf("2");
        mma_start(0x4c, 1);
        printf("3");
        mma_send_byte(0);
        printf("4");
        mma_stop();
        printf("5");
        mma_start(0x4c, 1);
        printf("6");
        mma_send_byte(0);
        printf("7");
        mma_restart(0x4c, 0);
        for (int i = 0; i <= 0xa; i++) {
            int data;
            if (i == 0xa) {
                data = mma_read_nack();
            } else {
                data = mma_read_ack();
            }
            printf(" %02x", data);
        }
        printf("\n");

        mma_start(0x4c, 1);
        mma_send_byte(7); // mode
        mma_send_byte(1); // active mode
        mma_stop();

        for (;;) {
626
            sys_tick_delay_ms(500);
Damien's avatar
Damien committed
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653

            mma_start(0x4c, 1);
            mma_send_byte(0);
            mma_restart(0x4c, 0);
            for (int i = 0; i <= 3; i++) {
                int data;
                if (i == 3) {
                    data = mma_read_nack();
                    printf(" %02x\n", data);
                } else {
                    data = mma_read_ack() & 0x3f;
                    if (data & 0x20) {
                        data |= 0xc0;
                    }
                    printf(" % 2d", data);
                }
            }
        }
    }

    // SD card testing
    if (0) {
        //sdio_init();
    }

    int i = 0;
    int n = 0;
654
    uint32_t stc = sys_tick_counter;
Damien's avatar
Damien committed
655
656

    for (;;) {
657
        sys_tick_delay_ms(10);
Damien's avatar
Damien committed
658
        if (sw_get()) {
659
            led_state(PYB_LED_G1, 1);
Damien's avatar
Damien committed
660
661
662
663
664
665
666
667
668
669
            i = 1 - i;
            if (i) {
                printf(" angel %05x.\n", n);
                //usb_vcp_send("hello!\r\n", 8);
            } else {
                printf(" mishka %4u.\n", n);
                //usb_vcp_send("angel!\r\n", 8);
            }
            n += 1;
        } else {
670
671
672
673
674
            led_state(PYB_LED_G1, 0);
        }
        if (sys_tick_has_passed(stc, 500)) {
            stc = sys_tick_counter;
            led_toggle(PYB_LED_G2);
Damien's avatar
Damien committed
675
676
677
678
679
        }
    }

    return 0;
}