1 | // Note: This file is copied and modified from fdcan crate by Richard Meadows |
2 | |
3 | use core::convert::Infallible; |
4 | use core::slice; |
5 | |
6 | use cfg_if::cfg_if; |
7 | |
8 | use crate::can::enums::*; |
9 | use crate::can::fd::config::*; |
10 | use crate::can::fd::message_ram::enums::*; |
11 | use crate::can::fd::message_ram::{RegisterBlock, RxFifoElement, TxBufferElement}; |
12 | use crate::can::frame::*; |
13 | |
14 | /// Loopback Mode |
15 | #[derive (Clone, Copy, Debug)] |
16 | enum LoopbackMode { |
17 | None, |
18 | Internal, |
19 | External, |
20 | } |
21 | |
22 | pub struct Registers { |
23 | pub regs: crate::pac::can::Fdcan, |
24 | pub msgram: crate::pac::fdcanram::Fdcanram, |
25 | #[allow (dead_code)] |
26 | pub msg_ram_offset: usize, |
27 | } |
28 | |
29 | impl Registers { |
30 | fn tx_buffer_element(&self, bufidx: usize) -> &mut TxBufferElement { |
31 | &mut self.msg_ram_mut().transmit.tbsa[bufidx] |
32 | } |
33 | pub fn msg_ram_mut(&self) -> &mut RegisterBlock { |
34 | #[cfg (can_fdcan_h7)] |
35 | let ptr = self.msgram.ram(self.msg_ram_offset / 4).as_ptr() as *mut RegisterBlock; |
36 | |
37 | #[cfg (not(can_fdcan_h7))] |
38 | let ptr = self.msgram.as_ptr() as *mut RegisterBlock; |
39 | |
40 | unsafe { &mut (*ptr) } |
41 | } |
42 | |
43 | fn rx_fifo_element(&self, fifonr: usize, bufnum: usize) -> &mut RxFifoElement { |
44 | &mut self.msg_ram_mut().receive[fifonr].fxsa[bufnum] |
45 | } |
46 | |
47 | pub fn read<F: CanHeader>(&self, fifonr: usize) -> Option<(F, u16)> { |
48 | // Fill level - do we have a msg? |
49 | if self.regs.rxfs(fifonr).read().ffl() < 1 { |
50 | return None; |
51 | } |
52 | |
53 | let read_idx = self.regs.rxfs(fifonr).read().fgi(); |
54 | let mailbox = self.rx_fifo_element(fifonr, read_idx as usize); |
55 | |
56 | let mut buffer = [0u8; 64]; |
57 | let maybe_header = extract_frame(mailbox, &mut buffer); |
58 | |
59 | // Clear FIFO, reduces count and increments read buf |
60 | self.regs.rxfa(fifonr).modify(|w| w.set_fai(read_idx)); |
61 | |
62 | match maybe_header { |
63 | Some((header, ts)) => { |
64 | let data = &buffer[0..header.len() as usize]; |
65 | match F::from_header(header, data) { |
66 | Ok(frame) => Some((frame, ts)), |
67 | Err(_) => None, |
68 | } |
69 | } |
70 | None => None, |
71 | } |
72 | } |
73 | |
74 | pub fn put_tx_frame(&self, bufidx: usize, header: &Header, buffer: &[u8]) { |
75 | let mailbox = self.tx_buffer_element(bufidx); |
76 | mailbox.reset(); |
77 | put_tx_header(mailbox, header); |
78 | put_tx_data(mailbox, &buffer[..header.len() as usize]); |
79 | |
80 | // Set <idx as Mailbox> as ready to transmit |
81 | self.regs.txbar().modify(|w| w.set_ar(bufidx, true)); |
82 | } |
83 | |
84 | fn reg_to_error(value: u8) -> Option<BusError> { |
85 | match value { |
86 | //0b000 => None, |
87 | 0b001 => Some(BusError::Stuff), |
88 | 0b010 => Some(BusError::Form), |
89 | 0b011 => Some(BusError::Acknowledge), |
90 | 0b100 => Some(BusError::BitRecessive), |
91 | 0b101 => Some(BusError::BitDominant), |
92 | 0b110 => Some(BusError::Crc), |
93 | //0b111 => Some(BusError::NoError), |
94 | _ => None, |
95 | } |
96 | } |
97 | |
98 | pub fn curr_error(&self) -> Option<BusError> { |
99 | let err = { self.regs.psr().read() }; |
100 | if err.bo() { |
101 | return Some(BusError::BusOff); |
102 | } else if err.ep() { |
103 | return Some(BusError::BusPassive); |
104 | } else if err.ew() { |
105 | return Some(BusError::BusWarning); |
106 | } else { |
107 | cfg_if! { |
108 | if #[cfg(can_fdcan_h7)] { |
109 | let lec = err.lec(); |
110 | } else { |
111 | let lec = err.lec().to_bits(); |
112 | } |
113 | } |
114 | if let Some(err) = Self::reg_to_error(lec) { |
115 | return Some(err); |
116 | } |
117 | } |
118 | None |
119 | } |
120 | /// Returns if the tx queue is able to accept new messages without having to cancel an existing one |
121 | #[inline ] |
122 | pub fn tx_queue_is_full(&self) -> bool { |
123 | self.regs.txfqs().read().tfqf() |
124 | } |
125 | |
126 | /// Returns the current TX buffer operation mode (queue or FIFO) |
127 | #[inline ] |
128 | pub fn tx_queue_mode(&self) -> TxBufferMode { |
129 | self.regs.txbc().read().tfqm().into() |
130 | } |
131 | |
132 | #[inline ] |
133 | pub fn has_pending_frame(&self, idx: usize) -> bool { |
134 | self.regs.txbrp().read().trp(idx) |
135 | } |
136 | |
137 | /// Returns `Ok` when the mailbox is free or if it contains pending frame with a |
138 | /// lower priority (higher ID) than the identifier `id`. |
139 | #[inline ] |
140 | pub fn is_available(&self, bufidx: usize, id: &embedded_can::Id) -> bool { |
141 | if self.has_pending_frame(bufidx) { |
142 | let mailbox = self.tx_buffer_element(bufidx); |
143 | |
144 | let header_reg = mailbox.header.read(); |
145 | let old_id = make_id(header_reg.id().bits(), header_reg.xtd().bits()); |
146 | |
147 | *id > old_id |
148 | } else { |
149 | true |
150 | } |
151 | } |
152 | |
153 | /// Attempts to abort the sending of a frame that is pending in a mailbox. |
154 | /// |
155 | /// If there is no frame in the provided mailbox, or its transmission succeeds before it can be |
156 | /// aborted, this function has no effect and returns `false`. |
157 | /// |
158 | /// If there is a frame in the provided mailbox, and it is canceled successfully, this function |
159 | /// returns `true`. |
160 | #[inline ] |
161 | pub fn abort(&self, bufidx: usize) -> bool { |
162 | let can = self.regs; |
163 | |
164 | // Check if there is a request pending to abort |
165 | if self.has_pending_frame(bufidx) { |
166 | // Abort Request |
167 | can.txbcr().write(|w| w.set_cr(bufidx, true)); |
168 | |
169 | // Wait for the abort request to be finished. |
170 | loop { |
171 | if can.txbcf().read().cf(bufidx) { |
172 | // Return false when a transmission has occured |
173 | break can.txbto().read().to(bufidx) == false; |
174 | } |
175 | } |
176 | } else { |
177 | false |
178 | } |
179 | } |
180 | |
181 | #[inline ] |
182 | fn abort_pending_mailbox<F: embedded_can::Frame>(&self, bufidx: usize) -> Option<F> { |
183 | if self.abort(bufidx) { |
184 | let mailbox = self.tx_buffer_element(bufidx); |
185 | |
186 | let header_reg = mailbox.header.read(); |
187 | let id = make_id(header_reg.id().bits(), header_reg.xtd().bits()); |
188 | |
189 | let len = match header_reg.to_data_length() { |
190 | DataLength::Fdcan(len) => len, |
191 | DataLength::Classic(len) => len, |
192 | }; |
193 | if len as usize > ClassicData::MAX_DATA_LEN { |
194 | return None; |
195 | } |
196 | |
197 | let mut data = [0u8; 64]; |
198 | data_from_tx_buffer(&mut data, mailbox, len as usize); |
199 | |
200 | if header_reg.rtr().bit() { |
201 | F::new_remote(id, len as usize) |
202 | } else { |
203 | F::new(id, &data[0..(len as usize)]) |
204 | } |
205 | } else { |
206 | // Abort request failed because the frame was already sent (or being sent) on |
207 | // the bus. All mailboxes are now free. This can happen for small prescaler |
208 | // values (e.g. 1MBit/s bit timing with a source clock of 8MHz) or when an ISR |
209 | // has preempted the execution. |
210 | None |
211 | } |
212 | } |
213 | |
214 | pub fn write<F: embedded_can::Frame + CanHeader>(&self, frame: &F) -> nb::Result<Option<F>, Infallible> { |
215 | let (idx, pending_frame) = if self.tx_queue_is_full() { |
216 | if self.tx_queue_mode() == TxBufferMode::Fifo { |
217 | // Does not make sense to cancel a pending frame when using FIFO |
218 | return Err(nb::Error::WouldBlock); |
219 | } |
220 | // If the queue is full, |
221 | // Discard the first slot with a lower priority message |
222 | let id = frame.header().id(); |
223 | if self.is_available(0, id) { |
224 | (0, self.abort_pending_mailbox(0)) |
225 | } else if self.is_available(1, id) { |
226 | (1, self.abort_pending_mailbox(1)) |
227 | } else if self.is_available(2, id) { |
228 | (2, self.abort_pending_mailbox(2)) |
229 | } else { |
230 | // For now we bail when there is no lower priority slot available |
231 | // Can this lead to priority inversion? |
232 | return Err(nb::Error::WouldBlock); |
233 | } |
234 | } else { |
235 | // Read the Write Pointer |
236 | let idx = self.regs.txfqs().read().tfqpi(); |
237 | |
238 | (idx, None) |
239 | }; |
240 | |
241 | self.put_tx_frame(idx as usize, frame.header(), frame.data()); |
242 | |
243 | Ok(pending_frame) |
244 | } |
245 | |
246 | #[inline ] |
247 | fn reset_msg_ram(&self) { |
248 | self.msg_ram_mut().reset(); |
249 | } |
250 | |
251 | #[inline ] |
252 | fn enter_init_mode(&self) { |
253 | self.regs.cccr().modify(|w| w.set_init(true)); |
254 | while false == self.regs.cccr().read().init() {} |
255 | self.regs.cccr().modify(|w| w.set_cce(true)); |
256 | } |
257 | |
258 | /// Enables or disables loopback mode: Internally connects the TX and RX |
259 | /// signals together. |
260 | #[inline ] |
261 | fn set_loopback_mode(&self, mode: LoopbackMode) { |
262 | let (test, mon, lbck) = match mode { |
263 | LoopbackMode::None => (false, false, false), |
264 | LoopbackMode::Internal => (true, true, true), |
265 | LoopbackMode::External => (true, false, true), |
266 | }; |
267 | |
268 | self.set_test_mode(test); |
269 | self.set_bus_monitoring_mode(mon); |
270 | |
271 | self.regs.test().modify(|w| w.set_lbck(lbck)); |
272 | } |
273 | |
274 | /// Enables or disables silent mode: Disconnects the TX signal from the pin. |
275 | #[inline ] |
276 | fn set_bus_monitoring_mode(&self, enabled: bool) { |
277 | self.regs.cccr().modify(|w| w.set_mon(enabled)); |
278 | } |
279 | |
280 | #[inline ] |
281 | fn set_restricted_operations(&self, enabled: bool) { |
282 | self.regs.cccr().modify(|w| w.set_asm(enabled)); |
283 | } |
284 | |
285 | #[inline ] |
286 | fn set_normal_operations(&self, _enabled: bool) { |
287 | self.set_loopback_mode(LoopbackMode::None); |
288 | } |
289 | |
290 | #[inline ] |
291 | fn set_test_mode(&self, enabled: bool) { |
292 | self.regs.cccr().modify(|w| w.set_test(enabled)); |
293 | } |
294 | |
295 | #[inline ] |
296 | fn set_power_down_mode(&self, enabled: bool) { |
297 | self.regs.cccr().modify(|w| w.set_csr(enabled)); |
298 | while self.regs.cccr().read().csa() != enabled {} |
299 | } |
300 | |
301 | /// Moves out of PoweredDownMode and into ConfigMode |
302 | #[inline ] |
303 | pub fn into_config_mode(self, _config: FdCanConfig) { |
304 | self.set_power_down_mode(false); |
305 | self.enter_init_mode(); |
306 | self.reset_msg_ram(); |
307 | |
308 | // check the FDCAN core matches our expections |
309 | assert!( |
310 | self.regs.crel().read().rel() == 3, |
311 | "Expected FDCAN core major release 3" |
312 | ); |
313 | assert!( |
314 | self.regs.endn().read().etv() == 0x87654321_u32, |
315 | "Error reading endianness test value from FDCAN core" |
316 | ); |
317 | |
318 | /* |
319 | for fid in 0..crate::can::message_ram::STANDARD_FILTER_MAX { |
320 | self.set_standard_filter((fid as u8).into(), StandardFilter::disable()); |
321 | } |
322 | for fid in 0..Ecrate::can::message_ram::XTENDED_FILTER_MAX { |
323 | self.set_extended_filter(fid.into(), ExtendedFilter::disable()); |
324 | } |
325 | */ |
326 | } |
327 | |
328 | /// Applies the settings of a new FdCanConfig See [`FdCanConfig`] |
329 | #[inline ] |
330 | pub fn apply_config(&self, config: FdCanConfig) { |
331 | self.set_tx_buffer_mode(config.tx_buffer_mode); |
332 | |
333 | // set standard filters list size to 28 |
334 | // set extended filters list size to 8 |
335 | // REQUIRED: we use the memory map as if these settings are set |
336 | // instead of re-calculating them. |
337 | #[cfg (not(can_fdcan_h7))] |
338 | { |
339 | self.regs.rxgfc().modify(|w| { |
340 | w.set_lss(crate::can::fd::message_ram::STANDARD_FILTER_MAX); |
341 | w.set_lse(crate::can::fd::message_ram::EXTENDED_FILTER_MAX); |
342 | }); |
343 | } |
344 | #[cfg (can_fdcan_h7)] |
345 | { |
346 | self.regs |
347 | .sidfc() |
348 | .modify(|w| w.set_lss(crate::can::fd::message_ram::STANDARD_FILTER_MAX)); |
349 | self.regs |
350 | .xidfc() |
351 | .modify(|w| w.set_lse(crate::can::fd::message_ram::EXTENDED_FILTER_MAX)); |
352 | } |
353 | |
354 | self.configure_msg_ram(); |
355 | |
356 | // Enable timestamping |
357 | #[cfg (not(can_fdcan_h7))] |
358 | self.regs |
359 | .tscc() |
360 | .write(|w| w.set_tss(stm32_metapac::can::vals::Tss::INCREMENT)); |
361 | #[cfg (can_fdcan_h7)] |
362 | self.regs.tscc().write(|w| w.set_tss(0x01)); |
363 | |
364 | // this isn't really documented in the reference manual |
365 | // but corresponding txbtie bit has to be set for the TC (TxComplete) interrupt to fire |
366 | self.regs.txbtie().write(|w| w.0 = 0xffff_ffff); |
367 | self.regs.ie().modify(|w| { |
368 | w.set_rfne(0, true); // Rx Fifo 0 New Msg |
369 | w.set_rfne(1, true); // Rx Fifo 1 New Msg |
370 | w.set_tce(true); // Tx Complete |
371 | w.set_boe(true); // Bus-Off Status Changed |
372 | }); |
373 | self.regs.ile().modify(|w| { |
374 | w.set_eint0(true); // Interrupt Line 0 |
375 | w.set_eint1(true); // Interrupt Line 1 |
376 | }); |
377 | |
378 | self.set_data_bit_timing(config.dbtr); |
379 | self.set_nominal_bit_timing(config.nbtr); |
380 | self.set_automatic_retransmit(config.automatic_retransmit); |
381 | self.set_transmit_pause(config.transmit_pause); |
382 | self.set_frame_transmit(config.frame_transmit); |
383 | //self.set_interrupt_line_config(config.interrupt_line_config); |
384 | self.set_non_iso_mode(config.non_iso_mode); |
385 | self.set_edge_filtering(config.edge_filtering); |
386 | self.set_protocol_exception_handling(config.protocol_exception_handling); |
387 | self.set_global_filter(config.global_filter); |
388 | } |
389 | |
390 | #[inline ] |
391 | fn leave_init_mode(&self, config: FdCanConfig) { |
392 | self.apply_config(config); |
393 | |
394 | self.regs.cccr().modify(|w| w.set_cce(false)); |
395 | self.regs.cccr().modify(|w| w.set_init(false)); |
396 | while self.regs.cccr().read().init() == true {} |
397 | } |
398 | |
399 | /// Moves out of ConfigMode and into specified mode |
400 | #[inline ] |
401 | pub fn into_mode(&self, config: FdCanConfig, mode: crate::can::_version::OperatingMode) { |
402 | match mode { |
403 | crate::can::OperatingMode::InternalLoopbackMode => self.set_loopback_mode(LoopbackMode::Internal), |
404 | crate::can::OperatingMode::ExternalLoopbackMode => self.set_loopback_mode(LoopbackMode::External), |
405 | crate::can::OperatingMode::NormalOperationMode => self.set_normal_operations(true), |
406 | crate::can::OperatingMode::RestrictedOperationMode => self.set_restricted_operations(true), |
407 | crate::can::OperatingMode::BusMonitoringMode => self.set_bus_monitoring_mode(true), |
408 | } |
409 | self.leave_init_mode(config); |
410 | } |
411 | |
412 | /// Configures the bit timings. |
413 | /// |
414 | /// You can use <http://www.bittiming.can-wiki.info/> to calculate the `btr` parameter. Enter |
415 | /// parameters as follows: |
416 | /// |
417 | /// - *Clock Rate*: The input clock speed to the CAN peripheral (*not* the CPU clock speed). |
418 | /// This is the clock rate of the peripheral bus the CAN peripheral is attached to (eg. APB1). |
419 | /// - *Sample Point*: Should normally be left at the default value of 87.5%. |
420 | /// - *SJW*: Should normally be left at the default value of 1. |
421 | /// |
422 | /// Then copy the `CAN_BUS_TIME` register value from the table and pass it as the `btr` |
423 | /// parameter to this method. |
424 | #[inline ] |
425 | pub fn set_nominal_bit_timing(&self, btr: NominalBitTiming) { |
426 | self.regs.nbtp().write(|w| { |
427 | w.set_nbrp(btr.nbrp() - 1); |
428 | w.set_ntseg1(btr.ntseg1() - 1); |
429 | w.set_ntseg2(btr.ntseg2() - 1); |
430 | w.set_nsjw(btr.nsjw() - 1); |
431 | }); |
432 | } |
433 | |
434 | /// Configures the data bit timings for the FdCan Variable Bitrates. |
435 | /// This is not used when frame_transmit is set to anything other than AllowFdCanAndBRS. |
436 | #[inline ] |
437 | pub fn set_data_bit_timing(&self, btr: DataBitTiming) { |
438 | self.regs.dbtp().write(|w| { |
439 | w.set_dbrp(btr.dbrp() - 1); |
440 | w.set_dtseg1(btr.dtseg1() - 1); |
441 | w.set_dtseg2(btr.dtseg2() - 1); |
442 | w.set_dsjw(btr.dsjw() - 1); |
443 | }); |
444 | } |
445 | |
446 | /// Enables or disables automatic retransmission of messages |
447 | /// |
448 | /// If this is enabled, the CAN peripheral will automatically try to retransmit each frame |
449 | /// util it can be sent. Otherwise, it will try only once to send each frame. |
450 | /// |
451 | /// Automatic retransmission is enabled by default. |
452 | #[inline ] |
453 | pub fn set_automatic_retransmit(&self, enabled: bool) { |
454 | self.regs.cccr().modify(|w| w.set_dar(!enabled)); |
455 | } |
456 | |
457 | /// Configures the transmit pause feature. See |
458 | /// [`FdCanConfig::set_transmit_pause`] |
459 | #[inline ] |
460 | pub fn set_transmit_pause(&self, enabled: bool) { |
461 | self.regs.cccr().modify(|w| w.set_txp(!enabled)); |
462 | } |
463 | |
464 | /// Configures non-iso mode. See [`FdCanConfig::set_non_iso_mode`] |
465 | #[inline ] |
466 | pub fn set_non_iso_mode(&self, enabled: bool) { |
467 | self.regs.cccr().modify(|w| w.set_niso(enabled)); |
468 | } |
469 | |
470 | /// Configures edge filtering. See [`FdCanConfig::set_edge_filtering`] |
471 | #[inline ] |
472 | pub fn set_edge_filtering(&self, enabled: bool) { |
473 | self.regs.cccr().modify(|w| w.set_efbi(enabled)); |
474 | } |
475 | |
476 | /// Configures TX Buffer Mode |
477 | #[inline ] |
478 | pub fn set_tx_buffer_mode(&self, tbm: TxBufferMode) { |
479 | self.regs.txbc().write(|w| w.set_tfqm(tbm.into())); |
480 | } |
481 | |
482 | /// Configures frame transmission mode. See |
483 | /// [`FdCanConfig::set_frame_transmit`] |
484 | #[inline ] |
485 | pub fn set_frame_transmit(&self, fts: FrameTransmissionConfig) { |
486 | let (fdoe, brse) = match fts { |
487 | FrameTransmissionConfig::ClassicCanOnly => (false, false), |
488 | FrameTransmissionConfig::AllowFdCan => (true, false), |
489 | FrameTransmissionConfig::AllowFdCanAndBRS => (true, true), |
490 | }; |
491 | |
492 | self.regs.cccr().modify(|w| { |
493 | w.set_fdoe(fdoe); |
494 | #[cfg (can_fdcan_h7)] |
495 | w.set_bse(brse); |
496 | #[cfg (not(can_fdcan_h7))] |
497 | w.set_brse(brse); |
498 | }); |
499 | } |
500 | |
501 | /// Sets the protocol exception handling on/off |
502 | #[inline ] |
503 | pub fn set_protocol_exception_handling(&self, enabled: bool) { |
504 | self.regs.cccr().modify(|w| w.set_pxhd(!enabled)); |
505 | } |
506 | |
507 | /// Configures and resets the timestamp counter |
508 | #[inline ] |
509 | #[allow (unused)] |
510 | pub fn set_timestamp_counter_source(&self, select: TimestampSource) { |
511 | #[cfg (can_fdcan_h7)] |
512 | let (tcp, tss) = match select { |
513 | TimestampSource::None => (0, 0), |
514 | TimestampSource::Prescaler(p) => (p as u8, 1), |
515 | TimestampSource::FromTIM3 => (0, 2), |
516 | }; |
517 | |
518 | #[cfg (not(can_fdcan_h7))] |
519 | let (tcp, tss) = match select { |
520 | TimestampSource::None => (0, stm32_metapac::can::vals::Tss::ZERO), |
521 | TimestampSource::Prescaler(p) => (p as u8, stm32_metapac::can::vals::Tss::INCREMENT), |
522 | TimestampSource::FromTIM3 => (0, stm32_metapac::can::vals::Tss::EXTERNAL), |
523 | }; |
524 | |
525 | self.regs.tscc().write(|w| { |
526 | w.set_tcp(tcp); |
527 | w.set_tss(tss); |
528 | }); |
529 | } |
530 | |
531 | #[cfg (not(can_fdcan_h7))] |
532 | /// Configures the global filter settings |
533 | #[inline ] |
534 | pub fn set_global_filter(&self, filter: GlobalFilter) { |
535 | let anfs = match filter.handle_standard_frames { |
536 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo0 => stm32_metapac::can::vals::Anfs::ACCEPT_FIFO_0, |
537 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo1 => stm32_metapac::can::vals::Anfs::ACCEPT_FIFO_1, |
538 | crate::can::fd::config::NonMatchingFilter::Reject => stm32_metapac::can::vals::Anfs::REJECT, |
539 | }; |
540 | let anfe = match filter.handle_extended_frames { |
541 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo0 => stm32_metapac::can::vals::Anfe::ACCEPT_FIFO_0, |
542 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo1 => stm32_metapac::can::vals::Anfe::ACCEPT_FIFO_1, |
543 | crate::can::fd::config::NonMatchingFilter::Reject => stm32_metapac::can::vals::Anfe::REJECT, |
544 | }; |
545 | |
546 | self.regs.rxgfc().modify(|w| { |
547 | w.set_anfs(anfs); |
548 | w.set_anfe(anfe); |
549 | w.set_rrfs(filter.reject_remote_standard_frames); |
550 | w.set_rrfe(filter.reject_remote_extended_frames); |
551 | }); |
552 | } |
553 | |
554 | #[cfg (can_fdcan_h7)] |
555 | /// Configures the global filter settings |
556 | #[inline ] |
557 | pub fn set_global_filter(&self, filter: GlobalFilter) { |
558 | let anfs = match filter.handle_standard_frames { |
559 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo0 => 0, |
560 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo1 => 1, |
561 | crate::can::fd::config::NonMatchingFilter::Reject => 2, |
562 | }; |
563 | |
564 | let anfe = match filter.handle_extended_frames { |
565 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo0 => 0, |
566 | crate::can::fd::config::NonMatchingFilter::IntoRxFifo1 => 1, |
567 | crate::can::fd::config::NonMatchingFilter::Reject => 2, |
568 | }; |
569 | |
570 | self.regs.gfc().modify(|w| { |
571 | w.set_anfs(anfs); |
572 | w.set_anfe(anfe); |
573 | w.set_rrfs(filter.reject_remote_standard_frames); |
574 | w.set_rrfe(filter.reject_remote_extended_frames); |
575 | }); |
576 | } |
577 | |
578 | #[cfg (not(can_fdcan_h7))] |
579 | fn configure_msg_ram(&self) {} |
580 | |
581 | #[cfg (can_fdcan_h7)] |
582 | fn configure_msg_ram(&self) { |
583 | let r = self.regs; |
584 | |
585 | use crate::can::fd::message_ram::*; |
586 | //use fdcan::message_ram::*; |
587 | let mut offset_words = (self.msg_ram_offset / 4) as u16; |
588 | |
589 | // 11-bit filter |
590 | r.sidfc().modify(|w| w.set_flssa(offset_words)); |
591 | offset_words += STANDARD_FILTER_MAX as u16; |
592 | |
593 | // 29-bit filter |
594 | r.xidfc().modify(|w| w.set_flesa(offset_words)); |
595 | offset_words += 2 * EXTENDED_FILTER_MAX as u16; |
596 | |
597 | // Rx FIFO 0 and 1 |
598 | for i in 0..=1 { |
599 | r.rxfc(i).modify(|w| { |
600 | w.set_fsa(offset_words); |
601 | w.set_fs(RX_FIFO_MAX); |
602 | w.set_fwm(RX_FIFO_MAX); |
603 | }); |
604 | offset_words += 18 * RX_FIFO_MAX as u16; |
605 | } |
606 | |
607 | // Rx buffer - see below |
608 | // Tx event FIFO |
609 | r.txefc().modify(|w| { |
610 | w.set_efsa(offset_words); |
611 | w.set_efs(TX_EVENT_MAX); |
612 | w.set_efwm(TX_EVENT_MAX); |
613 | }); |
614 | offset_words += 2 * TX_EVENT_MAX as u16; |
615 | |
616 | // Tx buffers |
617 | r.txbc().modify(|w| { |
618 | w.set_tbsa(offset_words); |
619 | w.set_tfqs(TX_FIFO_MAX); |
620 | }); |
621 | offset_words += 18 * TX_FIFO_MAX as u16; |
622 | |
623 | // Rx Buffer - not used |
624 | r.rxbc().modify(|w| { |
625 | w.set_rbsa(offset_words); |
626 | }); |
627 | |
628 | // TX event FIFO? |
629 | // Trigger memory? |
630 | |
631 | // Set the element sizes to 16 bytes |
632 | r.rxesc().modify(|w| { |
633 | w.set_rbds(0b111); |
634 | for i in 0..=1 { |
635 | w.set_fds(i, 0b111); |
636 | } |
637 | }); |
638 | r.txesc().modify(|w| { |
639 | w.set_tbds(0b111); |
640 | }) |
641 | } |
642 | } |
643 | |
644 | fn make_id(id: u32, extended: bool) -> embedded_can::Id { |
645 | if extended { |
646 | embedded_can::Id::from(unsafe { embedded_can::ExtendedId::new_unchecked(raw:id & 0x1FFFFFFF) }) |
647 | } else { |
648 | // A standard identifier is stored into ID[28:18]. |
649 | embedded_can::Id::from(unsafe { embedded_can::StandardId::new_unchecked(((id >> 18) & 0x000007FF) as u16) }) |
650 | } |
651 | } |
652 | |
653 | fn put_tx_header(mailbox: &mut TxBufferElement, header: &Header) { |
654 | let (id, id_type) = match header.id() { |
655 | // A standard identifier has to be written to ID[28:18]. |
656 | embedded_can::Id::Standard(id) => ((id.as_raw() as u32) << 18, IdType::StandardId), |
657 | embedded_can::Id::Extended(id) => (id.as_raw() as u32, IdType::ExtendedId), |
658 | }; |
659 | |
660 | // Use FDCAN only for DLC > 8. FDCAN users can revise this if required. |
661 | let frame_format = if header.len() > 8 || header.fdcan() { |
662 | FrameFormat::Fdcan |
663 | } else { |
664 | FrameFormat::Classic |
665 | }; |
666 | let brs = (frame_format == FrameFormat::Fdcan) && header.bit_rate_switching(); |
667 | |
668 | mailbox.header.write(|w| { |
669 | unsafe { w.id().bits(id) } |
670 | .rtr() |
671 | .bit(header.len() == 0 && header.rtr()) |
672 | .xtd() |
673 | .set_id_type(id_type) |
674 | .set_len(DataLength::new(header.len(), frame_format)) |
675 | .set_event(Event::NoEvent) |
676 | .fdf() |
677 | .set_format(frame_format) |
678 | .brs() |
679 | .bit(brs) |
680 | //esi.set_error_indicator(//TODO//) |
681 | }); |
682 | } |
683 | |
684 | fn put_tx_data(mailbox: &mut TxBufferElement, buffer: &[u8]) { |
685 | let mut lbuffer: [u32; 16] = [0_u32; 16]; |
686 | let len: usize = buffer.len(); |
687 | let data: &mut [u8] = unsafe { slice::from_raw_parts_mut(data:lbuffer.as_mut_ptr() as *mut u8, len) }; |
688 | data[..len].copy_from_slice(&buffer[..len]); |
689 | let data_len: usize = ((len) + 3) / 4; |
690 | for (register: &mut RW, byte: &u32) in mailbox.data.iter_mut().zip(lbuffer[..data_len].iter()) { |
691 | unsafe { register.write(*byte) }; |
692 | } |
693 | } |
694 | |
695 | fn data_from_fifo(buffer: &mut [u8], mailbox: &RxFifoElement, len: usize) { |
696 | for (i: usize, register: &RW) in mailbox.data.iter().enumerate() { |
697 | let register_value: u32 = register.read(); |
698 | let register_bytes: &[u8] = unsafe { slice::from_raw_parts(®ister_value as *const u32 as *const u8, len:4) }; |
699 | let num_bytes: usize = (len) - i * 4; |
700 | if num_bytes <= 4 { |
701 | buffer[i * 4..i * 4 + num_bytes].copy_from_slice(®ister_bytes[..num_bytes]); |
702 | break; |
703 | } |
704 | buffer[i * 4..(i + 1) * 4].copy_from_slice(src:register_bytes); |
705 | } |
706 | } |
707 | |
708 | fn data_from_tx_buffer(buffer: &mut [u8], mailbox: &TxBufferElement, len: usize) { |
709 | for (i: usize, register: &RW) in mailbox.data.iter().enumerate() { |
710 | let register_value: u32 = register.read(); |
711 | let register_bytes: &[u8] = unsafe { slice::from_raw_parts(®ister_value as *const u32 as *const u8, len:4) }; |
712 | let num_bytes: usize = (len) - i * 4; |
713 | if num_bytes <= 4 { |
714 | buffer[i * 4..i * 4 + num_bytes].copy_from_slice(®ister_bytes[..num_bytes]); |
715 | break; |
716 | } |
717 | buffer[i * 4..(i + 1) * 4].copy_from_slice(src:register_bytes); |
718 | } |
719 | } |
720 | |
721 | fn extract_frame(mailbox: &RxFifoElement, buffer: &mut [u8]) -> Option<(Header, u16)> { |
722 | let header_reg: R<[u32; 2], Reg<[u32; 2], …>> = mailbox.header.read(); |
723 | |
724 | let id: Id = make_id(id:header_reg.id().bits(), extended:header_reg.xtd().bits()); |
725 | let dlc: u8 = header_reg.to_data_length().len(); |
726 | let len: usize = dlc as usize; |
727 | let timestamp: u16 = header_reg.txts().bits; |
728 | if len > buffer.len() { |
729 | return None; |
730 | } |
731 | data_from_fifo(buffer, mailbox, len); |
732 | let header: Header = if header_reg.fdf().bits { |
733 | Header::new_fd(id, len:dlc, rtr:header_reg.rtr().bits(), brs:header_reg.brs().bits()) |
734 | } else { |
735 | Header::new(id, len:dlc, rtr:header_reg.rtr().bits()) |
736 | }; |
737 | Some((header, timestamp)) |
738 | } |
739 | |