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昨天翻译了USB部分,但是鉴于我有一段翻译实在不知道怎么组织,所以不放上来了,等我什么时候想到了就再放上来) v ]% k, b( B# }, G 今天首先学习了CAN部分的芯片手册。这是与can有关的结构体及注释: typedef struct {0 R; x% ]8 F; M b CAN_TypeDef *Instance; /*!< Register base address */---这是寄存器的基本地址( x( E7 G9 S9 g CAN_InitTypeDef Init; /*!< CAN required parameters */这是初始化相应的参数1 A! E, R# `# B5 N8 Z CanTxMsgTypeDef* pTxMsg; /*!< Pointer to transmit structure */----类似于UART的--TX9 \$ m f2 L U; K5 ?- x1 J & M+ o2 [6 |' m# X$ q CanRxMsgTypeDef* pRxMsg; /*!< Pointer to reception structure */类似于UART的--RX HAL_LockTypeDef Lock; /*!< CAN locking object */" X; J$ _, U) P ( s3 f" Z. X) z; T- v) E4 ^/ g+ h+ e __IO HAL_CAN_StateTypeDef State; /*!< CAN communication state */ ( j/ [/ ?5 N5 ^ __IO HAL_CAN_ErrorTypeDef ErrorCode; /*!< CAN Error code */ }CAN_HandleTypeDef;' M9 E- Z0 T y! M1 C 3 S2 a) B: E+ K ~ CAN∴寄存器地址& i( q& w0 s. f3 I! D typedef struct { __IO uint32_t MCR; /*!< CAN master control register, Address offset: 0x00 */ __IO uint32_t MSR; /*!< CAN master status register, Address offset: 0x04 */ __IO uint32_t TSR; /*!< CAN transmit status register, Address offset: 0x08 */7 Y M; c" c# ]! L( K% G __IO uint32_t RF0R; /*!< CAN receive FIFO 0 register, Address offset: 0x0C */ __IO uint32_t RF1R; /*!< CAN receive FIFO 1 register, Address offset: 0x10 */ __IO uint32_t IER; /*!< CAN interrupt enable register, Address offset: 0x14 */ __IO uint32_t ESR; /*!< CAN error status register, Address offset: 0x18 */ __IO uint32_t BTR; /*!< CAN bit timing register, Address offset: 0x1C */ uint32_t RESERVED0[88]; /*!< Reserved, 0x020 - 0x17F */) |8 w0 Z; p* a& R! C. P2 u! c J& P: ? CAN_TxMailBox_TypeDef sTxMailBox[3]; /*!< CAN Tx MailBox, Address offset: 0x180 - 0x1AC */ ?: Z" C7 b) |/ [6 B" w0 A. g! } CAN_FIFOMailBox_TypeDef sFIFOMailBox[2]; /*!< CAN FIFO MailBox, Address offset: 0x1B0 - 0x1CC */ uint32_t RESERVED1[12]; /*!< Reserved, 0x1D0 - 0x1FF */ __IO uint32_t FMR; /*!< CAN filter master register, Address offset: 0x200 */ __IO uint32_t FM1R; /*!< CAN filter mode register, Address offset: 0x204 */ uint32_t RESERVED2; /*!< Reserved, 0x208 */ __IO uint32_t FS1R; /*!< CAN filter scale register, Address offset: 0x20C */ j7 N0 f5 m$ R9 H0 D, T+ H" \ uint32_t RESERVED3; /*!< Reserved, 0x210 */$ {5 i. [6 g8 d( ?+ L __IO uint32_t FFA1R; /*!< CAN filter FIFO assignment register, Address offset: 0x214 */9 P2 l; h/ l9 A" L5 T/ ~ uint32_t RESERVED4; /*!< Reserved, 0x218 */ __IO uint32_t FA1R; /*!< CAN filter activation register, Address offset: 0x21C */9 c7 O: k5 V8 S uint32_t RESERVED5[8]; /*!< Reserved, 0x220-0x23F */ CAN_FilterRegister_TypeDef sFilterRegister[28]; /*!< CAN Filter Register, Address offset: 0x240-0x31C */- c2 u( ~; B1 k; |( H6 G8 H }CAN_TypeDef; 1 ^# @) U# n2 g3 S( j typedef struct { __IO uint32_t TIR; /*!< CAN TX mailbox identifier register */ __IO uint32_t TDTR; /*!< CAN mailbox data length control and time stamp register *// f0 ]* c) X9 R" p __IO uint32_t TDLR; /*!< CAN mailbox data low register */ __IO uint32_t TDHR; /*!< CAN mailbox data high register */3 L# G& u7 R) H% I/ U }CAN_TxMailBox_TypeDef;0 Z- a5 u9 a8 M' U* J' Y0 [3 m /** * @brief Controller Area Network FIFOMailBox! X* |. f( c. b7 m */ typedef struct {0 `1 U* k+ d G, \1 y: Q __IO uint32_t RIR; /*!< CAN receive FIFO mailbox identifier register */! I0 w; d5 n8 e% s5 s __IO uint32_t RDTR; /*!< CAN receive FIFO mailbox data length control and time stamp register */ __IO uint32_t RDLR; /*!< CAN receive FIFO mailbox data low register */1 n6 {9 ~* j& s2 w) J& P8 t" y __IO uint32_t RDHR; /*!< CAN receive FIFO mailbox data high register */ }CAN_FIFOMailBox_TypeDef;" d8 r' T! { \# l" H3 ?' i ( L4 Q- n4 V4 q4 y: E /**) R5 z5 F1 x* w/ O1 G f * @brief Controller Area Network FilterRegister e2 y7 i* Z) \" B */! ]2 X9 A) s0 Q& ~2 N typedef struct/ E1 g. s" H" H# C/ _$ T( V; _, M {1 f3 G# M* L6 G' v$ ? __IO uint32_t FR1; /*!< CAN Filter bank register 1 */) P4 |8 L! k, Q! j- d __IO uint32_t FR2; /*!< CAN Filter bank register 1 */ }CAN_FilterRegister_TypeDef;: Y4 z$ R- {- ]/ M ) u* L! k: R( `/ H typedef struct {- k. @9 u- d$ }8 L, x' m9 {+ A uint32_t Prescaler; /*!< Specifies the length of a time quantum. This parameter must be a number between Min_Data = 1 and Max_Data = 1024. */ 3 f7 m, c, O* I# k uint32_t Mode; /*!< Specifies the CAN operating mode. This parameter can be a value of @ref CAN_operating_mode */$ w6 ? v8 g" _8 e2 Y ( X5 ]+ o% o; U/ l5 ~ uint32_t SJW; /*!< Specifies the maximum number of time quanta the CAN hardware is allowed to lengthen or 8 C, c. Q6 `* s+ ? shorten a bit to perform resynchronization.2 j8 \6 `' Z6 z+ W This parameter can be a value of @ref CAN_synchronisation_jump_width */, H G j( O, U i2 t; q1 y/ t5 l. V 2 n: |3 I' G- |: f4 @ uint32_t BS1; /*!< Specifies the number of time quanta in Bit Segment 1.+ N! B9 b* r! c+ ^& v e This parameter can be a value of @ref CAN_time_quantum_in_bit_segment_1 *// q/ V f% |' z |. t N6 K* {$ ` # g) V& W( `2 P" _% w5 ? uint32_t BS2; /*!< Specifies the number of time quanta in Bit Segment 2. This parameter can be a value of @ref CAN_time_quantum_in_bit_segment_2 */ uint32_t TTCM; /*!< Enable or disable the time triggered communication mode.- _5 V' K7 S' F" d This parameter can be set to ENABLE or DISABLE. */9 l7 H) N; s2 L2 |. _ uint32_t ABOM; /*!< Enable or disable the automatic bus-off management. This parameter can be set to ENABLE or DISABLE. */ - V% ]" o) K; I8 k* q: A uint32_t AWUM; /*!< Enable or disable the automatic wake-up mode. ; h# @) ?( }5 h This parameter can be set to ENABLE or DISABLE. */ uint32_t NART; /*!< Enable or disable the non-automatic retransmission mode. This parameter can be set to ENABLE or DISABLE. */& x+ O$ ]# k) y! y& O0 H# c9 ^# k x } ) e4 ?/ }8 t+ i% D2 U. H# t/ y uint32_t RFLM; /*!< Enable or disable the Receive FIFO Locked mode.9 x* J* [! V3 ~$ `# a- d This parameter can be set to ENABLE or DISABLE. */& V, q7 U2 A6 k) d 3 N4 f1 X+ x$ k uint32_t TXFP; /*!< Enable or disable the transmit FIFO priority.* r: `( Z6 D+ R% _ This parameter can be set to ENABLE or DISABLE. */9 J6 |" }* y0 w' j3 y }CAN_InitTypeDef;& v0 b4 r) e& g a8 p typedef struct { uint32_t StdId; /*!< Specifies the standard identifier.- |. V/ {4 e( B, h% L5 @$ G This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */ $ F9 w* ^' g; O3 I A 9 W/ o1 M5 ]+ H) P4 W) H uint32_t ExtId; /*!< Specifies the extended identifier. This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */ uint32_t IDE; /*!< Specifies the type of identifier for the message that will be transmitted. This parameter can be a value of @ref CAN_identifier_type */ uint32_t RTR; /*!< Specifies the type of frame for the message that will be transmitted.0 a t2 T4 ?+ I9 d r9 N; y. y This parameter can be a value of @ref CAN_remote_transmission_request */ uint32_t DLC; /*!< Specifies the length of the frame that will be transmitted.) Q9 T% t. V. m/ T. e This parameter must be a number between Min_Data = 0 and Max_Data = 8. */ uint32_t Data[8]; /*!< Contains the data to be transmitted. ' _+ Y) ~+ b$ {( B This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */ & z' Y; `& K3 C }CanTxMsgTypeDef;) ^- b& }8 U$ |& K; X typedef struct# K# @ L* d# t1 c3 D' N0 e { uint32_t StdId; /*!< Specifies the standard identifier. This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */ ?1 u4 C9 V2 E: I uint32_t ExtId; /*!< Specifies the extended identifier.- N& f& A: p2 L& g This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */ uint32_t IDE; /*!< Specifies the type of identifier for the message that will be received.6 A: e; V |" P8 M$ L This parameter can be a value of @ref CAN_identifier_type */ ( C! _2 }4 w( u# _ uint32_t RTR; /*!< Specifies the type of frame for the received message. This parameter can be a value of @ref CAN_remote_transmission_request */4 c3 L$ c$ E/ L# h# L2 h uint32_t DLC; /*!< Specifies the length of the frame that will be received.( a/ k" f2 X# _$ X0 J This parameter must be a number between Min_Data = 0 and Max_Data = 8. */ . ?! ~ i$ E1 X. L. a uint32_t Data[8]; /*!< Contains the data to be received. This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */ uint32_t FMI; /*!< Specifies the index of the filter the message stored in the mailbox passes through.5 z0 F2 w* A) B This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */ " t% `; P! v6 { r0 L5 G: y% f8 H uint32_t FIFONumber; /*!< Specifies the receive FIFO number. This parameter can be CAN_FIFO0 or CAN_FIFO1 */ e+ ~% M: O+ A ? U, L }CanRxMsgTypeDef; % d3 ?; O2 k+ o, s \ ?1 d 还有CAN异步跳转的数据宽度 #define CAN_SJW_1TQ ((uint32_t)0x00000000) /*!< 1 time quantum */ #define CAN_SJW_2TQ ((uint32_t)CAN_BTR_SJW_0) /*!< 2 time quantum */ #define CAN_SJW_3TQ ((uint32_t)CAN_BTR_SJW_1) /*!< 3 time quantum */ #define CAN_SJW_4TQ ((uint32_t)CAN_BTR_SJW) /*!< 4 time quantum */: d$ V; A% [# ~& ^. z2 k - t' x6 _4 d0 t2 K" t9 ~ typedef struct { uint32_t StdId; /*!< Specifies the standard identifier. This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */ uint32_t ExtId; /*!< Specifies the extended identifier.# `, l/ l w- A+ K. _ This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */ 7 Y1 D9 a& g" I! m) D& t9 E6 x uint32_t IDE; /*!< Specifies the type of identifier for the message that will be received.% R" W: O0 I4 h) H5 q$ n. } This parameter can be a value of @ref CAN_identifier_type */8 R2 i8 l% ~' J" |) I# ` ; n' |; g% ~& |) b8 n uint32_t RTR; /*!< Specifies the type of frame for the received message. This parameter can be a value of @ref CAN_remote_transmission_request */ uint32_t DLC; /*!< Specifies the length of the frame that will be received. This parameter must be a number between Min_Data = 0 and Max_Data = 8. */ 9 g4 u" z& `/ F" |5 I+ |* }9 @ uint32_t Data[8]; /*!< Contains the data to be received. ! t; |) Z1 C, w7 L+ p5 u This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */5 k d, S+ H0 Y" H/ l uint32_t FMI; /*!< Specifies the index of the filter the message stored in the mailbox passes through. This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */ 4 M: `% v. f2 ]2 _$ s. [% L2 V uint32_t FIFONumber; /*!< Specifies the receive FIFO number. This parameter can be CAN_FIFO0 or CAN_FIFO1 */ " R/ o8 U4 D8 B }CanRxMsgTypeDef;( F' `, j) H) w1 z' s8 n& m 这是CAN有关接收数据的参数 还有其他的数据结构定义,不过先回来看我的INIT函数; c+ e/ w- a& c" L9 y! U; t! n HAL_StatusTypeDef HAL_CAN_Init(CAN_HandleTypeDef* hcan)5 S9 }( t+ U- b1 n { uint32_t status = CAN_INITSTATUS_FAILED; /* Default init status */ uint32_t tickstart = 0;1 l7 |+ L' F- b% T ! f3 l, ]# |$ `0 f9 r4 c/ | /* Check CAN handle */. A+ _/ V; w y4 i" S( \ if(hcan == NULL)6 F- D' Q$ ]# J, k+ L { return HAL_ERROR;# U4 \8 X, q2 g* U }+ |% z: e; K* _2 s A# s ( G; s$ o" P/ X; ^% J /* Check the parameters */4 s: ?. |$ k+ z5 t* V7 T' t" y5 p( H. V assert_param(IS_CAN_ALL_INSTANCE(hcan->Instance)); assert_param(IS_FUNCTIONAL_STATE(hcan->Init.TTCM)); assert_param(IS_FUNCTIONAL_STATE(hcan->Init.ABOM)); assert_param(IS_FUNCTIONAL_STATE(hcan->Init.AWUM));% P: L' c) e1 ?5 x5 @ assert_param(IS_FUNCTIONAL_STATE(hcan->Init.NART)); assert_param(IS_FUNCTIONAL_STATE(hcan->Init.RFLM));- D/ c' u3 g) ` assert_param(IS_FUNCTIONAL_STATE(hcan->Init.TXFP)); assert_param(IS_CAN_MODE(hcan->Init.Mode));: B( o3 V/ W S/ X/ M& u assert_param(IS_CAN_SJW(hcan->Init.SJW)); assert_param(IS_CAN_BS1(hcan->Init.BS1));: n+ }- M/ y7 { assert_param(IS_CAN_BS2(hcan->Init.BS2));; F7 y: s, r) ^3 ?" c; Q assert_param(IS_CAN_PRESCALER(hcan->Init.Prescaler));# b$ z4 P) o! r # R" ]9 m1 Q4 Y5 Q) ?/ x4 \/ M) Q9 R if(hcan->State == HAL_CAN_STATE_RESET) {& s$ _ ~( C2 R7 G3 `# |0 \ /* Init the low level hardware */ HAL_CAN_MspInit(hcan);$ W- i" l- {- i0 ^( T }$ ~1 V: w- H8 v3 H /* Initialize the CAN state*/ hcan->State = HAL_CAN_STATE_BUSY;& g* X$ t& Q* w1 t5 V0 N+ s # W }$ h( P4 m- l2 N" E0 \3 V /* Exit from sleep mode */# U2 t" a+ |1 J1 C2 M8 \! m9 |4 c hcan->Instance->MCR &= (~(uint32_t)CAN_MCR_SLEEP);# h$ `0 ^7 n7 Y$ I+ `% o /* Request initialisation */0 K' b( ^( m2 r& ]; C6 M hcan->Instance->MCR |= CAN_MCR_INRQ ; /* Get tickstart */ tickstart = HAL_GetTick(); # o: H( T, A1 r( i. b8 I 4 l! S9 _2 S2 K7 N& j /* Wait the acknowledge */ while((hcan->Instance->MSR & CAN_MSR_INAK) != CAN_MSR_INAK) {( Y, ~! O: s. H) Q! W: y if((HAL_GetTick() - tickstart) > HAL_CAN_DEFAULT_TIMEOUT) { hcan->State= HAL_CAN_STATE_TIMEOUT; return HAL_TIMEOUT; } }$ D$ e% A |& Q' X( I 5 [7 ^+ I: u; _/ n8 V( p! F /* Check acknowledge */, D! ]2 ]9 ?0 V0 u* I0 ~# ] if ((hcan->Instance->MSR & CAN_MSR_INAK) == CAN_MSR_INAK); p9 T- ~/ G( H { /* Set the time triggered communication mode */ if (hcan->Init.TTCM == ENABLE)8 t" h8 n3 z* T3 \# W0 ^1 q7 } { hcan->Instance->MCR |= CAN_MCR_TTCM;* k1 t8 n/ k3 {$ n O }4 B: b) D) n1 T1 `9 P5 [9 B else {& W8 Y9 A5 F! K! I hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_TTCM;. O/ M1 ^' u* a$ J2 y0 { j5 r } /* Set the automatic bus-off management */( L/ {# m R% y; r- F: e+ _ if (hcan->Init.ABOM == ENABLE) {% V; M ~- F: w. h hcan->Instance->MCR |= CAN_MCR_ABOM; } else/ _. J5 ?# q# k. G- m# `9 |' d { hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_ABOM;9 u) u% P, Q6 g' f [7 L" c& q9 n A } /* Set the automatic wake-up mode */ if (hcan->Init.AWUM == ENABLE) { hcan->Instance->MCR |= CAN_MCR_AWUM;! o9 a) E0 [, z+ g& ~. ^' Y } else [3 N# d8 W, K7 U) E5 D* H, i {7 N+ K0 s, S7 z! l) A. o hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_AWUM; } /* Set the no automatic retransmission */! f P( H+ @% h6 s) U if (hcan->Init.NART == ENABLE)( Z/ | j9 J2 B6 s" J" ~6 w {( ]* s& L1 l3 O* J0 u" @! V( o hcan->Instance->MCR |= CAN_MCR_NART;! C9 u6 k8 R- d( y) b* l% p' a } else0 V7 s+ s/ v3 ^! R ] { hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_NART;9 z5 t; |& u$ ^2 t$ [4 p# x) h x }' S" f5 j4 i) b/ I& t' a ) r2 r# o& m$ K /* Set the receive FIFO locked mode */$ g* T$ ~* s6 b& s B% ]4 R if (hcan->Init.RFLM == ENABLE) {$ W- O2 C7 H) t# O) ]& ?8 v hcan->Instance->MCR |= CAN_MCR_RFLM; } else { hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_RFLM; }! W; O% M8 J* c& D9 L l ! |* `* T3 X* \5 h9 x; c /* Set the transmit FIFO priority */ if (hcan->Init.TXFP == ENABLE) { hcan->Instance->MCR |= CAN_MCR_TXFP; } else {; z$ l# I* _$ g/ ^* }/ } hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_TXFP;# g* |- P, ^% V$ p1 x& u6 _ }4 O$ i) ]$ m; E; ^ 4 I" G: [5 L1 t" f8 U( h /* Set the bit timing register */ hcan->Instance->BTR = (uint32_t)((uint32_t)hcan->Init.Mode) | \ ((uint32_t)hcan->Init.SJW) | \3 v3 B& j3 y9 Y7 a5 r ((uint32_t)hcan->Init.BS1) | \ ((uint32_t)hcan->Init.BS2) | \ ((uint32_t)hcan->Init.Prescaler - 1);& [, g [- R+ E3 v5 n/ h8 T /* Request leave initialisation */- |( m1 C. Y* F6 G. @$ d hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_INRQ;/ a+ \: V$ L9 i4 q+ u! T+ Q# G$ A /* Get timeout */ tickstart = HAL_GetTick(); ) X$ W e/ F6 {2 ] ! x E6 z7 v3 K. t4 f- E /* Wait the acknowledge */' }) q5 N+ ~% ?, p! t$ j/ r K3 w$ @ while((hcan->Instance->MSR & CAN_MSR_INAK) == CAN_MSR_INAK) { if((HAL_GetTick() - tickstart) > HAL_CAN_DEFAULT_TIMEOUT) {. M/ s z) t* i% E' d" E hcan->State= HAL_CAN_STATE_TIMEOUT;( N3 J+ k7 D* a, p* _ return HAL_TIMEOUT;4 |' V* \9 T; ~ } }% c* \- c8 l0 M3 i& v8 x /* Check acknowledged */% ?( b$ b2 k' C! J if ((hcan->Instance->MSR & CAN_MSR_INAK) != CAN_MSR_INAK) {/ k* S4 A9 W% } status = CAN_INITSTATUS_SUCCESS;) B, I8 I% V9 @3 g" ^7 D- y0 P } } ( f* _7 d$ A% b: v: V if(status == CAN_INITSTATUS_SUCCESS) {4 c9 p9 ^# J0 t /* Set CAN error code to none */ hcan->ErrorCode = HAL_CAN_ERROR_NONE;* n' n ?+ \8 t$ X % m# w' R- W4 q4 I /* Initialize the CAN state */: G+ s8 x& D$ S* c4 ` hcan->State = HAL_CAN_STATE_READY;! L: j2 ]( Q/ W) S, v" e9 _ /* Return function status */: G/ ]& a0 {$ o9 y* ^ p+ [0 V return HAL_OK;* S: k* W" |) l$ N/ E: { } else' U4 ~1 I/ T0 h; j, k {4 J2 y* {7 K4 d$ N1 ]5 h5 U" Z* J6 C /* Initialize the CAN state */ hcan->State = HAL_CAN_STATE_ERROR; /* Return function status */ return HAL_ERROR; } }( R+ _* ?3 l5 \: n; ~5 d |
| CAN工业上用的多点吧,记得有一次看见万东的高频机使用了 can,还特地学习了下CAN的原理 |
谢谢分享。学习了
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| 我也在弄CAN。打算移植CANOPEN协议做主站 |
| 坚持就是胜利系列~ |
| 谢谢分享。 |
| 谢谢分享。 |
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| 楼主辛苦了! |
| 不明觉厉,顶 |
| 工业上CAN多,还有其他一些,个人汽车 |
没怎么看懂。。。。 |
| 不懂帮顶! |
| 不明觉厉。。。。。。。。。。。 |
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