-
Notifications
You must be signed in to change notification settings - Fork 642
/
mod.rs
1159 lines (1014 loc) · 33.8 KB
/
mod.rs
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
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
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
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
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
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
626
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
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//! Serial Peripheral Interface (SPI)
#![macro_use]
use core::marker::PhantomData;
use core::ptr;
use embassy_embedded_hal::SetConfig;
use embassy_futures::join::join;
use embassy_hal_internal::PeripheralRef;
pub use embedded_hal_02::spi::{Mode, Phase, Polarity, MODE_0, MODE_1, MODE_2, MODE_3};
use crate::dma::{slice_ptr_parts, word, ChannelAndRequest};
use crate::gpio::{AFType, AnyPin, Pull, SealedPin as _, Speed};
use crate::mode::{Async, Blocking, Mode as PeriMode};
use crate::pac::spi::{regs, vals, Spi as Regs};
use crate::rcc::{ClockEnableBit, SealedRccPeripheral};
use crate::time::Hertz;
use crate::Peripheral;
/// SPI error.
#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error {
/// Invalid framing.
Framing,
/// CRC error (only if hardware CRC checking is enabled).
Crc,
/// Mode fault
ModeFault,
/// Overrun.
Overrun,
}
/// SPI bit order
#[derive(Copy, Clone)]
pub enum BitOrder {
/// Least significant bit first.
LsbFirst,
/// Most significant bit first.
MsbFirst,
}
/// SPI configuration.
#[non_exhaustive]
#[derive(Copy, Clone)]
pub struct Config {
/// SPI mode.
pub mode: Mode,
/// Bit order.
pub bit_order: BitOrder,
/// Clock frequency.
pub frequency: Hertz,
/// Enable internal pullup on MISO.
///
/// There are some ICs that require a pull-up on the MISO pin for some applications.
/// If you are unsure, you probably don't need this.
pub miso_pull: Pull,
}
impl Default for Config {
fn default() -> Self {
Self {
mode: MODE_0,
bit_order: BitOrder::MsbFirst,
frequency: Hertz(1_000_000),
miso_pull: Pull::None,
}
}
}
impl Config {
fn raw_phase(&self) -> vals::Cpha {
match self.mode.phase {
Phase::CaptureOnSecondTransition => vals::Cpha::SECONDEDGE,
Phase::CaptureOnFirstTransition => vals::Cpha::FIRSTEDGE,
}
}
fn raw_polarity(&self) -> vals::Cpol {
match self.mode.polarity {
Polarity::IdleHigh => vals::Cpol::IDLEHIGH,
Polarity::IdleLow => vals::Cpol::IDLELOW,
}
}
fn raw_byte_order(&self) -> vals::Lsbfirst {
match self.bit_order {
BitOrder::LsbFirst => vals::Lsbfirst::LSBFIRST,
BitOrder::MsbFirst => vals::Lsbfirst::MSBFIRST,
}
}
fn sck_pull_mode(&self) -> Pull {
match self.mode.polarity {
Polarity::IdleLow => Pull::Down,
Polarity::IdleHigh => Pull::Up,
}
}
}
/// SPI driver.
pub struct Spi<'d, M: PeriMode> {
pub(crate) info: &'static Info,
kernel_clock: Hertz,
sck: Option<PeripheralRef<'d, AnyPin>>,
mosi: Option<PeripheralRef<'d, AnyPin>>,
miso: Option<PeripheralRef<'d, AnyPin>>,
tx_dma: Option<ChannelAndRequest<'d>>,
rx_dma: Option<ChannelAndRequest<'d>>,
_phantom: PhantomData<M>,
current_word_size: word_impl::Config,
}
impl<'d, M: PeriMode> Spi<'d, M> {
fn new_inner<T: Instance>(
_peri: impl Peripheral<P = T> + 'd,
sck: Option<PeripheralRef<'d, AnyPin>>,
mosi: Option<PeripheralRef<'d, AnyPin>>,
miso: Option<PeripheralRef<'d, AnyPin>>,
tx_dma: Option<ChannelAndRequest<'d>>,
rx_dma: Option<ChannelAndRequest<'d>>,
config: Config,
) -> Self {
let regs = T::info().regs;
let kernel_clock = T::frequency();
let br = compute_baud_rate(kernel_clock, config.frequency);
let cpha = config.raw_phase();
let cpol = config.raw_polarity();
let lsbfirst = config.raw_byte_order();
T::enable_and_reset();
#[cfg(any(spi_v1, spi_f1))]
{
regs.cr2().modify(|w| {
w.set_ssoe(false);
});
regs.cr1().modify(|w| {
w.set_cpha(cpha);
w.set_cpol(cpol);
w.set_mstr(vals::Mstr::MASTER);
w.set_br(br);
w.set_spe(true);
w.set_lsbfirst(lsbfirst);
w.set_ssi(true);
w.set_ssm(true);
w.set_crcen(false);
w.set_bidimode(vals::Bidimode::UNIDIRECTIONAL);
if mosi.is_none() {
w.set_rxonly(vals::Rxonly::OUTPUTDISABLED);
}
w.set_dff(<u8 as SealedWord>::CONFIG)
});
}
#[cfg(spi_v2)]
{
regs.cr2().modify(|w| {
let (ds, frxth) = <u8 as SealedWord>::CONFIG;
w.set_frxth(frxth);
w.set_ds(ds);
w.set_ssoe(false);
});
regs.cr1().modify(|w| {
w.set_cpha(cpha);
w.set_cpol(cpol);
w.set_mstr(vals::Mstr::MASTER);
w.set_br(br);
w.set_lsbfirst(lsbfirst);
w.set_ssi(true);
w.set_ssm(true);
w.set_crcen(false);
w.set_bidimode(vals::Bidimode::UNIDIRECTIONAL);
w.set_spe(true);
});
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
{
regs.ifcr().write(|w| w.0 = 0xffff_ffff);
regs.cfg2().modify(|w| {
//w.set_ssoe(true);
w.set_ssoe(false);
w.set_cpha(cpha);
w.set_cpol(cpol);
w.set_lsbfirst(lsbfirst);
w.set_ssm(true);
w.set_master(vals::Master::MASTER);
w.set_comm(vals::Comm::FULLDUPLEX);
w.set_ssom(vals::Ssom::ASSERTED);
w.set_midi(0);
w.set_mssi(0);
w.set_afcntr(true);
w.set_ssiop(vals::Ssiop::ACTIVEHIGH);
});
regs.cfg1().modify(|w| {
w.set_crcen(false);
w.set_mbr(br);
w.set_dsize(<u8 as SealedWord>::CONFIG);
w.set_fthlv(vals::Fthlv::ONEFRAME);
});
regs.cr2().modify(|w| {
w.set_tsize(0);
});
regs.cr1().modify(|w| {
w.set_ssi(false);
w.set_spe(true);
});
}
Self {
info: T::info(),
kernel_clock,
sck,
mosi,
miso,
tx_dma,
rx_dma,
current_word_size: <u8 as SealedWord>::CONFIG,
_phantom: PhantomData,
}
}
/// Reconfigures it with the supplied config.
pub fn set_config(&mut self, config: &Config) -> Result<(), ()> {
let cpha = config.raw_phase();
let cpol = config.raw_polarity();
let lsbfirst = config.raw_byte_order();
let br = compute_baud_rate(self.kernel_clock, config.frequency);
#[cfg(any(spi_v1, spi_f1, spi_v2))]
self.info.regs.cr1().modify(|w| {
w.set_cpha(cpha);
w.set_cpol(cpol);
w.set_br(br);
w.set_lsbfirst(lsbfirst);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
{
self.info.regs.cfg2().modify(|w| {
w.set_cpha(cpha);
w.set_cpol(cpol);
w.set_lsbfirst(lsbfirst);
});
self.info.regs.cfg1().modify(|w| {
w.set_mbr(br);
});
}
Ok(())
}
/// Get current SPI configuration.
pub fn get_current_config(&self) -> Config {
#[cfg(any(spi_v1, spi_f1, spi_v2))]
let cfg = self.info.regs.cr1().read();
#[cfg(any(spi_v3, spi_v4, spi_v5))]
let cfg = self.info.regs.cfg2().read();
#[cfg(any(spi_v3, spi_v4, spi_v5))]
let cfg1 = self.info.regs.cfg1().read();
let polarity = if cfg.cpol() == vals::Cpol::IDLELOW {
Polarity::IdleLow
} else {
Polarity::IdleHigh
};
let phase = if cfg.cpha() == vals::Cpha::FIRSTEDGE {
Phase::CaptureOnFirstTransition
} else {
Phase::CaptureOnSecondTransition
};
let bit_order = if cfg.lsbfirst() == vals::Lsbfirst::LSBFIRST {
BitOrder::LsbFirst
} else {
BitOrder::MsbFirst
};
let miso_pull = match &self.miso {
None => Pull::None,
Some(pin) => pin.pull(),
};
#[cfg(any(spi_v1, spi_f1, spi_v2))]
let br = cfg.br();
#[cfg(any(spi_v3, spi_v4, spi_v5))]
let br = cfg1.mbr();
let frequency = compute_frequency(self.kernel_clock, br);
Config {
mode: Mode { polarity, phase },
bit_order,
frequency,
miso_pull,
}
}
fn set_word_size(&mut self, word_size: word_impl::Config) {
if self.current_word_size == word_size {
return;
}
#[cfg(any(spi_v1, spi_f1))]
{
self.info.regs.cr1().modify(|reg| {
reg.set_spe(false);
reg.set_dff(word_size)
});
self.info.regs.cr1().modify(|reg| {
reg.set_spe(true);
});
}
#[cfg(spi_v2)]
{
self.info.regs.cr1().modify(|w| {
w.set_spe(false);
});
self.info.regs.cr2().modify(|w| {
w.set_frxth(word_size.1);
w.set_ds(word_size.0);
});
self.info.regs.cr1().modify(|w| {
w.set_spe(true);
});
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
{
self.info.regs.cr1().modify(|w| {
w.set_csusp(true);
});
while self.info.regs.sr().read().eot() {}
self.info.regs.cr1().modify(|w| {
w.set_spe(false);
});
self.info.regs.cfg1().modify(|w| {
w.set_dsize(word_size);
});
self.info.regs.cr1().modify(|w| {
w.set_csusp(false);
w.set_spe(true);
});
}
self.current_word_size = word_size;
}
/// Blocking write.
pub fn blocking_write<W: Word>(&mut self, words: &[W]) -> Result<(), Error> {
self.info.regs.cr1().modify(|w| w.set_spe(true));
flush_rx_fifo(self.info.regs);
self.set_word_size(W::CONFIG);
for word in words.iter() {
let _ = transfer_word(self.info.regs, *word)?;
}
Ok(())
}
/// Blocking read.
pub fn blocking_read<W: Word>(&mut self, words: &mut [W]) -> Result<(), Error> {
self.info.regs.cr1().modify(|w| w.set_spe(true));
flush_rx_fifo(self.info.regs);
self.set_word_size(W::CONFIG);
for word in words.iter_mut() {
*word = transfer_word(self.info.regs, W::default())?;
}
Ok(())
}
/// Blocking in-place bidirectional transfer.
///
/// This writes the contents of `data` on MOSI, and puts the received data on MISO in `data`, at the same time.
pub fn blocking_transfer_in_place<W: Word>(&mut self, words: &mut [W]) -> Result<(), Error> {
self.info.regs.cr1().modify(|w| w.set_spe(true));
flush_rx_fifo(self.info.regs);
self.set_word_size(W::CONFIG);
for word in words.iter_mut() {
*word = transfer_word(self.info.regs, *word)?;
}
Ok(())
}
/// Blocking bidirectional transfer.
///
/// This transfers both buffers at the same time, so it is NOT equivalent to `write` followed by `read`.
///
/// The transfer runs for `max(read.len(), write.len())` bytes. If `read` is shorter extra bytes are ignored.
/// If `write` is shorter it is padded with zero bytes.
pub fn blocking_transfer<W: Word>(&mut self, read: &mut [W], write: &[W]) -> Result<(), Error> {
self.info.regs.cr1().modify(|w| w.set_spe(true));
flush_rx_fifo(self.info.regs);
self.set_word_size(W::CONFIG);
let len = read.len().max(write.len());
for i in 0..len {
let wb = write.get(i).copied().unwrap_or_default();
let rb = transfer_word(self.info.regs, wb)?;
if let Some(r) = read.get_mut(i) {
*r = rb;
}
}
Ok(())
}
}
impl<'d> Spi<'d, Blocking> {
/// Create a new blocking SPI driver.
pub fn new_blocking<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
miso: impl Peripheral<P = impl MisoPin<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
new_pin!(miso, AFType::Input, Speed::VeryHigh, config.miso_pull),
None,
None,
config,
)
}
/// Create a new blocking SPI driver, in RX-only mode (only MISO pin, no MOSI).
pub fn new_blocking_rxonly<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
miso: impl Peripheral<P = impl MisoPin<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
None,
new_pin!(miso, AFType::Input, Speed::VeryHigh, config.miso_pull),
None,
None,
config,
)
}
/// Create a new blocking SPI driver, in TX-only mode (only MOSI pin, no MISO).
pub fn new_blocking_txonly<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
None,
None,
None,
config,
)
}
/// Create a new SPI driver, in TX-only mode, without SCK pin.
///
/// This can be useful for bit-banging non-SPI protocols.
pub fn new_blocking_txonly_nosck<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
None,
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
None,
None,
None,
config,
)
}
}
impl<'d> Spi<'d, Async> {
/// Create a new SPI driver.
pub fn new<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
miso: impl Peripheral<P = impl MisoPin<T>> + 'd,
tx_dma: impl Peripheral<P = impl TxDma<T>> + 'd,
rx_dma: impl Peripheral<P = impl RxDma<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
new_pin!(miso, AFType::Input, Speed::VeryHigh),
new_dma!(tx_dma),
new_dma!(rx_dma),
config,
)
}
/// Create a new SPI driver, in RX-only mode (only MISO pin, no MOSI).
pub fn new_rxonly<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
miso: impl Peripheral<P = impl MisoPin<T>> + 'd,
rx_dma: impl Peripheral<P = impl RxDma<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
None,
new_pin!(miso, AFType::Input, Speed::VeryHigh),
None,
new_dma!(rx_dma),
config,
)
}
/// Create a new SPI driver, in TX-only mode (only MOSI pin, no MISO).
pub fn new_txonly<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
sck: impl Peripheral<P = impl SckPin<T>> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
tx_dma: impl Peripheral<P = impl TxDma<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
new_pin!(sck, AFType::OutputPushPull, Speed::VeryHigh, config.sck_pull_mode()),
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
None,
new_dma!(tx_dma),
None,
config,
)
}
/// Create a new SPI driver, in TX-only mode, without SCK pin.
///
/// This can be useful for bit-banging non-SPI protocols.
pub fn new_txonly_nosck<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
mosi: impl Peripheral<P = impl MosiPin<T>> + 'd,
tx_dma: impl Peripheral<P = impl TxDma<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(
peri,
None,
new_pin!(mosi, AFType::OutputPushPull, Speed::VeryHigh),
None,
new_dma!(tx_dma),
None,
config,
)
}
#[cfg(stm32wl)]
/// Useful for on chip peripherals like SUBGHZ which are hardwired.
pub fn new_subghz<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
tx_dma: impl Peripheral<P = impl TxDma<T>> + 'd,
rx_dma: impl Peripheral<P = impl RxDma<T>> + 'd,
) -> Self {
// see RM0453 rev 1 section 7.2.13 page 291
// The SUBGHZSPI_SCK frequency is obtained by PCLK3 divided by two.
// The SUBGHZSPI_SCK clock maximum speed must not exceed 16 MHz.
let pclk3_freq = <crate::peripherals::SUBGHZSPI as crate::rcc::SealedRccPeripheral>::frequency().0;
let freq = Hertz(core::cmp::min(pclk3_freq / 2, 16_000_000));
let mut config = Config::default();
config.mode = MODE_0;
config.bit_order = BitOrder::MsbFirst;
config.frequency = freq;
Self::new_inner(peri, None, None, None, new_dma!(tx_dma), new_dma!(rx_dma), config)
}
#[allow(dead_code)]
pub(crate) fn new_internal<T: Instance>(
peri: impl Peripheral<P = T> + 'd,
tx_dma: impl Peripheral<P = impl TxDma<T>> + 'd,
rx_dma: impl Peripheral<P = impl RxDma<T>> + 'd,
config: Config,
) -> Self {
Self::new_inner(peri, None, None, None, new_dma!(tx_dma), new_dma!(rx_dma), config)
}
/// SPI write, using DMA.
pub async fn write<W: Word>(&mut self, data: &[W]) -> Result<(), Error> {
if data.is_empty() {
return Ok(());
}
self.set_word_size(W::CONFIG);
self.info.regs.cr1().modify(|w| {
w.set_spe(false);
});
let tx_dst = self.info.regs.tx_ptr();
let tx_f = unsafe { self.tx_dma.as_mut().unwrap().write(data, tx_dst, Default::default()) };
set_txdmaen(self.info.regs, true);
self.info.regs.cr1().modify(|w| {
w.set_spe(true);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
self.info.regs.cr1().modify(|w| {
w.set_cstart(true);
});
tx_f.await;
finish_dma(self.info.regs);
Ok(())
}
/// SPI read, using DMA.
pub async fn read<W: Word>(&mut self, data: &mut [W]) -> Result<(), Error> {
if data.is_empty() {
return Ok(());
}
self.set_word_size(W::CONFIG);
self.info.regs.cr1().modify(|w| {
w.set_spe(false);
});
// SPIv3 clears rxfifo on SPE=0
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
flush_rx_fifo(self.info.regs);
set_rxdmaen(self.info.regs, true);
let clock_byte_count = data.len();
let rx_src = self.info.regs.rx_ptr();
let rx_f = unsafe { self.rx_dma.as_mut().unwrap().read(rx_src, data, Default::default()) };
let tx_dst = self.info.regs.tx_ptr();
let clock_byte = 0x00u8;
let tx_f = unsafe {
self.tx_dma
.as_mut()
.unwrap()
.write_repeated(&clock_byte, clock_byte_count, tx_dst, Default::default())
};
set_txdmaen(self.info.regs, true);
self.info.regs.cr1().modify(|w| {
w.set_spe(true);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
self.info.regs.cr1().modify(|w| {
w.set_cstart(true);
});
join(tx_f, rx_f).await;
finish_dma(self.info.regs);
Ok(())
}
async fn transfer_inner<W: Word>(&mut self, read: *mut [W], write: *const [W]) -> Result<(), Error> {
let (_, rx_len) = slice_ptr_parts(read);
let (_, tx_len) = slice_ptr_parts(write);
assert_eq!(rx_len, tx_len);
if rx_len == 0 {
return Ok(());
}
self.set_word_size(W::CONFIG);
self.info.regs.cr1().modify(|w| {
w.set_spe(false);
});
// SPIv3 clears rxfifo on SPE=0
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
flush_rx_fifo(self.info.regs);
set_rxdmaen(self.info.regs, true);
let rx_src = self.info.regs.rx_ptr();
let rx_f = unsafe { self.rx_dma.as_mut().unwrap().read_raw(rx_src, read, Default::default()) };
let tx_dst = self.info.regs.tx_ptr();
let tx_f = unsafe {
self.tx_dma
.as_mut()
.unwrap()
.write_raw(write, tx_dst, Default::default())
};
set_txdmaen(self.info.regs, true);
self.info.regs.cr1().modify(|w| {
w.set_spe(true);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
self.info.regs.cr1().modify(|w| {
w.set_cstart(true);
});
join(tx_f, rx_f).await;
finish_dma(self.info.regs);
Ok(())
}
/// Bidirectional transfer, using DMA.
///
/// This transfers both buffers at the same time, so it is NOT equivalent to `write` followed by `read`.
///
/// The transfer runs for `max(read.len(), write.len())` bytes. If `read` is shorter extra bytes are ignored.
/// If `write` is shorter it is padded with zero bytes.
pub async fn transfer<W: Word>(&mut self, read: &mut [W], write: &[W]) -> Result<(), Error> {
self.transfer_inner(read, write).await
}
/// In-place bidirectional transfer, using DMA.
///
/// This writes the contents of `data` on MOSI, and puts the received data on MISO in `data`, at the same time.
pub async fn transfer_in_place<W: Word>(&mut self, data: &mut [W]) -> Result<(), Error> {
self.transfer_inner(data, data).await
}
}
impl<'d, M: PeriMode> Drop for Spi<'d, M> {
fn drop(&mut self) {
self.sck.as_ref().map(|x| x.set_as_disconnected());
self.mosi.as_ref().map(|x| x.set_as_disconnected());
self.miso.as_ref().map(|x| x.set_as_disconnected());
self.info.enable_bit.disable();
}
}
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
use vals::Br;
#[cfg(any(spi_v3, spi_v4, spi_v5))]
use vals::Mbr as Br;
fn compute_baud_rate(kernel_clock: Hertz, freq: Hertz) -> Br {
let val = match kernel_clock.0 / freq.0 {
0 => panic!("You are trying to reach a frequency higher than the clock"),
1..=2 => 0b000,
3..=5 => 0b001,
6..=11 => 0b010,
12..=23 => 0b011,
24..=39 => 0b100,
40..=95 => 0b101,
96..=191 => 0b110,
_ => 0b111,
};
Br::from_bits(val)
}
fn compute_frequency(kernel_clock: Hertz, br: Br) -> Hertz {
let div: u16 = match br {
Br::DIV2 => 2,
Br::DIV4 => 4,
Br::DIV8 => 8,
Br::DIV16 => 16,
Br::DIV32 => 32,
Br::DIV64 => 64,
Br::DIV128 => 128,
Br::DIV256 => 256,
};
kernel_clock / div
}
trait RegsExt {
fn tx_ptr<W>(&self) -> *mut W;
fn rx_ptr<W>(&self) -> *mut W;
}
impl RegsExt for Regs {
fn tx_ptr<W>(&self) -> *mut W {
#[cfg(any(spi_v1, spi_f1))]
let dr = self.dr();
#[cfg(spi_v2)]
let dr = self.dr16();
#[cfg(any(spi_v3, spi_v4, spi_v5))]
let dr = self.txdr32();
dr.as_ptr() as *mut W
}
fn rx_ptr<W>(&self) -> *mut W {
#[cfg(any(spi_v1, spi_f1))]
let dr = self.dr();
#[cfg(spi_v2)]
let dr = self.dr16();
#[cfg(any(spi_v3, spi_v4, spi_v5))]
let dr = self.rxdr32();
dr.as_ptr() as *mut W
}
}
fn check_error_flags(sr: regs::Sr) -> Result<(), Error> {
if sr.ovr() {
return Err(Error::Overrun);
}
#[cfg(not(any(spi_f1, spi_v3, spi_v4, spi_v5)))]
if sr.fre() {
return Err(Error::Framing);
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
if sr.tifre() {
return Err(Error::Framing);
}
if sr.modf() {
return Err(Error::ModeFault);
}
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
if sr.crcerr() {
return Err(Error::Crc);
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
if sr.crce() {
return Err(Error::Crc);
}
Ok(())
}
fn spin_until_tx_ready(regs: Regs) -> Result<(), Error> {
loop {
let sr = regs.sr().read();
check_error_flags(sr)?;
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
if sr.txe() {
return Ok(());
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
if sr.txp() {
return Ok(());
}
}
}
fn spin_until_rx_ready(regs: Regs) -> Result<(), Error> {
loop {
let sr = regs.sr().read();
check_error_flags(sr)?;
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
if sr.rxne() {
return Ok(());
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
if sr.rxp() {
return Ok(());
}
}
}
fn flush_rx_fifo(regs: Regs) {
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
while regs.sr().read().rxne() {
#[cfg(not(spi_v2))]
let _ = regs.dr().read();
#[cfg(spi_v2)]
let _ = regs.dr16().read();
}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
while regs.sr().read().rxp() {
let _ = regs.rxdr32().read();
}
}
fn set_txdmaen(regs: Regs, val: bool) {
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
regs.cr2().modify(|reg| {
reg.set_txdmaen(val);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
regs.cfg1().modify(|reg| {
reg.set_txdmaen(val);
});
}
fn set_rxdmaen(regs: Regs, val: bool) {
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
regs.cr2().modify(|reg| {
reg.set_rxdmaen(val);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
regs.cfg1().modify(|reg| {
reg.set_rxdmaen(val);
});
}
fn finish_dma(regs: Regs) {
#[cfg(spi_v2)]
while regs.sr().read().ftlvl().to_bits() > 0 {}
#[cfg(any(spi_v3, spi_v4, spi_v5))]
while !regs.sr().read().txc() {}
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
while regs.sr().read().bsy() {}
// Disable the spi peripheral
regs.cr1().modify(|w| {
w.set_spe(false);
});
// The peripheral automatically disables the DMA stream on completion without error,
// but it does not clear the RXDMAEN/TXDMAEN flag in CR2.
#[cfg(not(any(spi_v3, spi_v4, spi_v5)))]
regs.cr2().modify(|reg| {
reg.set_txdmaen(false);
reg.set_rxdmaen(false);
});
#[cfg(any(spi_v3, spi_v4, spi_v5))]
regs.cfg1().modify(|reg| {
reg.set_txdmaen(false);
reg.set_rxdmaen(false);
});
}
fn transfer_word<W: Word>(regs: Regs, tx_word: W) -> Result<W, Error> {
spin_until_tx_ready(regs)?;
unsafe {
ptr::write_volatile(regs.tx_ptr(), tx_word);
#[cfg(any(spi_v3, spi_v4, spi_v5))]
regs.cr1().modify(|reg| reg.set_cstart(true));
}
spin_until_rx_ready(regs)?;
let rx_word = unsafe { ptr::read_volatile(regs.rx_ptr()) };
Ok(rx_word)
}
// Note: It is not possible to impl these traits generically in embedded-hal 0.2 due to a conflict with
// some marker traits. For details, see https://github.com/rust-embedded/embedded-hal/pull/289
macro_rules! impl_blocking {
($w:ident) => {
impl<'d, M: PeriMode> embedded_hal_02::blocking::spi::Write<$w> for Spi<'d, M> {
type Error = Error;
fn write(&mut self, words: &[$w]) -> Result<(), Self::Error> {
self.blocking_write(words)
}
}
impl<'d, M: PeriMode> embedded_hal_02::blocking::spi::Transfer<$w> for Spi<'d, M> {
type Error = Error;
fn transfer<'w>(&mut self, words: &'w mut [$w]) -> Result<&'w [$w], Self::Error> {
self.blocking_transfer_in_place(words)?;
Ok(words)
}
}
};
}
impl_blocking!(u8);
impl_blocking!(u16);
impl<'d, M: PeriMode> embedded_hal_1::spi::ErrorType for Spi<'d, M> {
type Error = Error;
}
impl<'d, W: Word, M: PeriMode> embedded_hal_1::spi::SpiBus<W> for Spi<'d, M> {
fn flush(&mut self) -> Result<(), Self::Error> {
Ok(())
}
fn read(&mut self, words: &mut [W]) -> Result<(), Self::Error> {
self.blocking_read(words)
}
fn write(&mut self, words: &[W]) -> Result<(), Self::Error> {
self.blocking_write(words)
}
fn transfer(&mut self, read: &mut [W], write: &[W]) -> Result<(), Self::Error> {
self.blocking_transfer(read, write)
}
fn transfer_in_place(&mut self, words: &mut [W]) -> Result<(), Self::Error> {
self.blocking_transfer_in_place(words)
}
}