中断接收方式,最大的缺点就是中断过于频繁,为了解决这个问题那就把DMA搬过来,它不就是专门搬用数据的嘛,不用多可惜。
3 d% a8 l. H" T5 [' s+ G' G b4 q6 J
. N2 `! d4 f! n# S. a" ^首先我们需要大致了解,DMA和外设传送数据,例如串口,我们希望,当一帧数据接收完毕了,有个东西告诉主程序,串口接收到了一帧n个字节的数据存在某个地方,接收过程中你丫别打搅我。
$ G5 y: \7 z$ p0 |
3 v6 P% k+ O9 \+ Q" zDMA就能胜任这个工作,他可以以中断的形式告诉你这些信息。相比中断接收方式,是不是省了很多中断,主程序被打断的次数也就少了。; b. S) [- _( e
0 S; @: c9 c3 R( G% n9 d7 ~2 {0 r还是按照上一篇形式大概看一下,HAL库中DMA是怎么和串口配合的。
+ M" F- k( d/ t9 @( Z8 \: \8 ? R- o' j- |
- /**
& J7 q0 z6 {. ^8 G - * @brief Receive an amount of data in DMA mode.
8 c0 P( {* q* N/ k! m7 O' I - * @note When the UART parity is enabled (PCE = 1), the received data contain4 `+ @& S4 a: D1 g" F# O
- * the parity bit (MSB position).
, a, c+ u8 _( b. q; D6 l: ]6 i- O! N - * @param huart UART handle.
' I. _7 J1 T/ r0 v( }/ h) c9 L! F - * @param pData Pointer to data buffer./ b+ F$ T. R' L
- * @param Size Amount of data to be received.
% o, {1 z; _ l3 K3 f$ i; t - * @retval HAL status0 D5 x7 M, u5 i( }& ]
- */
& d; S, ^7 |6 T9 J4 W - HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)4 e/ D) w0 j; ]
- {
3 O! r) }5 q% I" i* A' \ - /* 其他关系不大的代码省略 有兴趣可以自己看 下同 */
2 G* \6 I7 a1 i( `3 A1 y, | - //1.检查参数 判断串口接收状态为就绪 把缓存区参数传递到串口句柄 修改某些状态
# g. x5 Z' c& I, |1 B0 Q, \4 X - //2.判断和串口句柄关联的DMA句柄地址不为空 然后给DMA句柄注册一些回调函数
z! |% t0 I; w4 [4 |$ n - /* Enable the DMA channel */
& M: w6 G% J- s6 U t - if (HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->RDR, (uint32_t)huart->pRxBuffPtr, Size) != HAL_OK)
$ E# e# U$ Z5 ]- N2 Z3 w - {
, B" l6 A. Y0 m5 \" `6 ?0 L* d - ......% |# _4 B5 C5 r# O$ w @ o- \
- }! i. A7 P+ Y, T3 r+ L
- }
复制代码 ; t3 V9 [4 H! Z x
HAL_UART_Receive_DMA这个函数里最主要的就是调用了HAL_DMA_Start_IT这个函数,你看他连参数都没怎么变,就把句柄换了,其他三个原封不动的传递过去了。所以函数内其他内容几乎不用考虑了。直接往下看这个函数。 n4 ` A9 @% d
. ^5 ?& W H% h9 P, y. z! F, X# E7 @
- /**
& g5 I! M' G! V1 J5 U; f( t - * @brief Start the DMA Transfer with interrupt enabled.1 y( H0 D k! ?0 E% |
- * @param hdma: pointer to a DMA_HandleTypeDef structure that contains
' v% ~* ^1 Z! R, m# q - * the configuration information for the specified DMA Stream.
. H6 a" N% x1 m: I - * @param SrcAddress: The source memory Buffer address
2 x& e% h( ?0 q- w5 B4 `0 p - * @param DstAddress: The destination memory Buffer address
7 ?5 Z d4 K. h0 a - * @param DataLength: The length of data to be transferred from source to destination
9 a" \: B. `2 q! ^# ~6 I - * @retval HAL status
0 x7 g9 ]$ |/ n6 @+ W# G6 A% c! v - */
# K! {, h( S0 K. r3 I4 a - HAL_StatusTypeDef HAL_DMA_Start_IT(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
- z9 n8 k2 v% B; l4 V' k4 {( \ - {
6 p6 x2 y! w; n, T - //1.检查参数 给句柄上锁 判断状态 只有在就绪状态下才允许配置1 t8 d3 V* \+ q {, d
- //2.判断就绪状态4 B1 ~/ ^# k: R2 z+ k1 K. W( v" a
- {
6 |9 Q9 e4 Z/ H - ......: m& l2 q* a+ h+ ~' _! V
- /* Configure the source, destination address and the data length */% H, X. a" y- @1 L0 O4 H
- DMA_SetConfig(hdma, SrcAddress, DstAddress, DataLength);6 X, j5 Y4 A; t" X
- ......8 D# f. U J3 a9 F; d
- //这里会开启一堆中断 完事要用 暂时可以不关心
9 D) f' D: M0 o- J4 x. T - } g9 _9 ^; x6 n6 M& }6 ~" h
- }
复制代码
+ k+ r) ]1 f3 T* G$ m$ j8 O上面这个函数也差不多还是那个意思,都懒的看了,主要是调用了DMA_SetConfig这个函数,追踪过去,它才是真正配置寄存器的函数,HAL库就是这么繁琐。4 ~6 O. U9 P+ ]
! Y, S: Y; g+ i/ x- /**
& ?3 \* k8 r! }8 `- s5 ]9 A2 `. u - * @brief Sets the DMA Transfer parameter.8 j! `8 m- }; g: |7 B; k
- * @param hdma: pointer to a DMA_HandleTypeDef structure that contains
2 s6 Q& t/ [' E - * the configuration information for the specified DMA Stream.
7 P- K7 \4 j9 O T - * @param SrcAddress: The source memory Buffer address
/ J; v% J0 `0 [; m' `) l- w - * @param DstAddress: The destination memory Buffer address
+ X; W' S( _3 g% j8 w - * @param DataLength: The length of data to be transferred from source to destination! A# e1 k; v. |
- * @retval None
2 e0 ]" t$ i: X+ C9 s2 z3 D - */2 E+ L4 Q, R! x
- static void DMA_SetConfig(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)6 _# i$ }* F% s {0 z8 q8 h) E
- {4 B/ X) U$ d/ }( J6 W! x- } {) D
- /* calculate DMA base and stream number */
4 Z) k! ~8 U6 F" [. i7 i. h - //获取DMA控制器对应流的基地址7 D2 @" q3 A4 r0 M; T2 o( b# c: _
- DMA_Base_Registers *regs_dma = (DMA_Base_Registers *)hdma->StreamBaseAddress;6 i3 _* ~7 g$ m) {. D }$ F& m
- BDMA_Base_Registers *regs_bdma = (BDMA_Base_Registers *)hdma->StreamBaseAddress;
- C8 E5 i2 _8 p - ' g+ [* U" J" ~; }
- /* Clear the DMAMUX synchro overrun flag */
: ^3 I; V* Z5 K+ A7 { - hdma->DMAmuxChannelStatus->CFR = hdma->DMAmuxChannelStatusMask;
. @2 y. L1 i$ {$ G - 7 o( b1 j4 q- N$ V
- if(hdma->DMAmuxRequestGen != 0U)+ Y1 g8 Z' Q/ d3 W1 }
- {
& A) R2 M- |% G - /* Clear the DMAMUX request generator overrun flag */+ u. P8 y, l: L$ N1 v
- hdma->DMAmuxRequestGenStatus->RGCFR = hdma->DMAmuxRequestGenStatusMask;
' E0 d0 U+ Q. @/ v4 H5 ~0 s - }/ W5 C/ H% g3 e! H* r
- / J, {# O& G1 x
- if(IS_DMA_STREAM_INSTANCE(hdma->Instance) != 0U) /* DMA1 or DMA2 instance */9 H4 C" r* D3 I( `$ o& i
- {: ?9 b1 E- i; J6 C3 w
- /* Clear all interrupt flags at correct offset within the register */3 R; Q# R& W8 g- m
- regs_dma->IFCR = 0x3FUL << (hdma->StreamIndex & 0x1FU);) e4 m: s9 G8 B6 u
- 9 \' N8 J8 K9 w f" J& C4 M! P
- /* Clear DBM bit */) s3 ?* J$ k& M7 l. d
- ((DMA_Stream_TypeDef *)hdma->Instance)->CR &= (uint32_t)(~DMA_SxCR_DBM);' e" C% K- K p. N/ {
! N0 Z: u7 D' } `6 X- /* Configure DMA Stream data length */' }% h% i f4 `6 U: [4 i
- //这里设置搬用的目标数据长度
# g$ L4 S$ S. [3 D2 Q - ((DMA_Stream_TypeDef *)hdma->Instance)->NDTR = DataLength;7 q" {& }: {, a, D% k
- / g7 A$ @2 B- `- y: |. R( J7 M
- /* Peripheral to Memory */# G: g. _/ w) ?* u) P
- //整个这个if判断是在设置DMA搬运数据的目标地址和源地址4 @9 K1 X. G- ^6 M8 u
- if((hdma->Init.Direction) == DMA_MEMORY_TO_PERIPH)
+ i& o6 B/ [. L! U6 J0 j - {+ x% W: D* r5 E+ b! J' \6 T( t! {% G
- /* Configure DMA Stream destination address */
4 [5 a. i, D; O9 w1 L- p - ((DMA_Stream_TypeDef *)hdma->Instance)->PAR = DstAddress;% e. @6 c3 S! K* z6 t _
- - g: o9 X5 n g$ p. Q# P
- /* Configure DMA Stream source address */
7 A9 i9 B% b' b7 H S - ((DMA_Stream_TypeDef *)hdma->Instance)->M0AR = SrcAddress;
7 I- m& }+ a3 t$ Y - }! ~- r9 M* C% [9 {7 U3 N) q' Q1 o
- /* Memory to Peripheral */& Z/ C0 }1 V& [
- else
5 U+ U, h1 l* [% B+ X- y) v( q P" _ - {/ I8 D, A' p, _" c
- /* Configure DMA Stream source address */
/ \2 u6 {4 g+ b0 e2 _' f4 j - ((DMA_Stream_TypeDef *)hdma->Instance)->PAR = SrcAddress;
7 P0 e" r) {8 D n. F2 j0 [2 x" U
& u+ q7 ^/ e1 [- /* Configure DMA Stream destination address */
' L+ i. y0 k- x$ O! L4 ?/ Y - ((DMA_Stream_TypeDef *)hdma->Instance)->M0AR = DstAddress;" Y4 J& h7 v- H( j
- }
+ w* M2 A1 @6 t) P* W. E5 v - }
) T* v, C2 S/ {$ ~3 p* o0 @% f - else if(IS_BDMA_CHANNEL_INSTANCE(hdma->Instance) != 0U) /* BDMA instance(s) */" e. t3 P4 q6 X) i7 G2 i
- {
! z' H' |+ }; k4 l5 c( Y - /* Clear all flags */
' R$ i, M3 F4 Z9 D3 t L: M - regs_bdma->IFCR = (BDMA_ISR_GIF0) << (hdma->StreamIndex & 0x1FU);
/ u5 `4 |$ S% z' C
% q3 V6 H) L9 W# w0 m3 g6 \- /* Configure DMA Channel data length */& Y$ ?- K+ B3 G8 t
- ((BDMA_Channel_TypeDef *)hdma->Instance)->CNDTR = DataLength; {8 V' l, Y, L- K8 D- A8 K: l
! u, b U* J- B; v- /* Peripheral to Memory */
, Y- @: ]7 e/ K1 e' | - if((hdma->Init.Direction) == DMA_MEMORY_TO_PERIPH)
2 n8 y) c' g# o* a0 U8 u- o6 t" c - {
% m! s4 c$ E$ {8 Q - /* Configure DMA Channel destination address */
+ V% l* G ~% y, F0 { h/ u" `' y - ((BDMA_Channel_TypeDef *)hdma->Instance)->CPAR = DstAddress;
5 q: d! T$ O) Z- n8 ]
+ I9 _2 y/ ~+ |! M- /* Configure DMA Channel source address */1 {+ W! g8 ~4 A+ l+ R3 p# H- Z
- ((BDMA_Channel_TypeDef *)hdma->Instance)->CM0AR = SrcAddress;
P: u. b/ u$ M( m! g% k - }
- f* x/ E" t' [ - /* Memory to Peripheral */# ?6 P/ ?& ~; L9 l- H
- else8 t g4 T t9 G$ ]5 E! v
- {
; J" V" U/ C% q, ~5 b6 Z - /* Configure DMA Channel source address */
9 A) X; ?0 B1 i) K5 l6 Y - ((BDMA_Channel_TypeDef *)hdma->Instance)->CPAR = SrcAddress;7 t- h& s* O8 I* x* a
( Q5 |8 d# J( A! j. A5 h- /* Configure DMA Channel destination address */$ s: e) y) _0 T+ s" i' B0 S# t& ~
- ((BDMA_Channel_TypeDef *)hdma->Instance)->CM0AR = DstAddress;
( {' H" z+ x, {7 t& G0 M& T! W - }
3 p/ a4 o6 n$ ]6 L - }
6 m% M$ D. R- R - else/ j6 [7 n* ~/ C. B
- {
' Y4 I$ h. `( U% S- [$ D0 t: n+ s' ` - /* Nothing To Do */8 L% Q' k/ q7 H8 ]6 }
- } 5 X$ y( R- ]# X7 O
- }
复制代码
& h3 a8 _, c/ E/ M' e各位同志你们自己看吧这个函数最主要的目的就是配置DMA寄存器。以上就是串口DMA接收函数中最重要的部分。好像没什么意义一样,因为我要用到其中的一点点东西,所以必须要分析源码。9 T$ \0 m; y8 S
" ~$ C- v) b1 |9 J' `9 `
我们只是说了调用接收函数,参数里边指定了接收缓存,也指定了大小,似乎和我们的目标不符合,假设我们的DMA和串口之间的配置已经配置好了,那现在能做到的就是把数据收集到这个缓冲区里,可是并不能告诉主程序接收到了数据,和接收了多少,想要知道这个,有两种方法,一种是CPU定时去问DMA接收了多少数据,然后自己定义一个记录变化的变量,配合,另一种是中断方式,我们通过查询得知,DMA只有接收完成和接收半完成两个中断。
* ^: ~2 z! g0 g/ v- s, \' h2 T1 j2 i! |4 G% h& S
最最主要的串口的空闲中断不要忘了呀,这个可以告诉你,一帧数据接收完了,你可以根据这个中断去搞,接收了多少,在什么地方。
) {4 e0 a2 y/ V0 m6 G# P* G3 v) C& z& n8 X9 \4 t& C
因为这个编辑器不知道咋回事,贴代码总是挂,上边那个函数就贴了我很长时间,很生气,所以我就无耻的把源码整到这里了,整个工程哦(暂时还没有上传)。' g2 g$ g/ I0 }6 ^# q& I2 M
9 S' m5 X& v. ^
再试试贴代码吧,方便你我他,要积分的都无耻。改天
; ~ `# P6 [' p+ F( n) Y7 ]! F- y. b S1 M6 d
uart.c文件就这么多代码,8 C6 q8 G6 u3 u: @) O9 p
+ m) Y5 _# I7 ?; k4 y- #include "Uart.h"
9 G: d" W9 _9 p1 { - #include "stm32h7xx_hal.h"
$ w9 G% E4 ?- j9 ~! l8 }
! V3 h3 U9 J {- #define RxBufSize 10242 d/ T, c9 X7 X; u" t" o" D( h
$ O6 h1 H+ p0 {6 Y- UART_HandleTypeDef hUart1 = {0};/ F& O8 e% \9 E. b, g( Z$ S
- DMA_HandleTypeDef hDmaUart1Tx = {0};8 \* `" H. o3 v9 @ W; l/ Y
- DMA_HandleTypeDef hDmaUart1Rx = {0};, m( \4 D0 |; }! P- C# }
- ' H T! y6 I% n4 d( J1 i( h
- //数组后边的那个限定跟你的内存分配有关 如果你的主RAM在512K的那个片内存就可以不加 这是AC6编译器用法
1 n- G5 }/ A( K3 D - uint8_t RxBuf[2][RxBufSize] __attribute__((section (".RAM_D1")));
! A5 [" [. Q$ c' s7 E - void (*Uart1RxCompleteCallback)(uint8_t *pData,uint16_t *Count);
+ y4 t# n H, ~1 K& @& ^& s - * {- w$ \0 @6 t4 V( N
- void Uart1Init(uint32_t BaudRate,void (*RxCompleteCallback)(uint8_t *pData,uint16_t *Count))
% T6 T7 I( K }+ Q. e/ u+ | - {0 ?3 C0 r% ]( T# J
- hUart1.Instance = USART1;
+ S' h7 Z# [. E5 R' U; Y/ R - hUart1.Init.BaudRate = BaudRate;
E/ Z* o+ w) U. o% G& S7 c" j1 W9 k N - hUart1.Init.ClockPrescaler = UART_PRESCALER_DIV2;
4 ` t3 \$ w; k1 G4 v) f3 L - hUart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
1 [6 I0 P$ B" [0 h - hUart1.Init.Mode = UART_MODE_TX_RX;
% f5 j- S; m! w6 Q - hUart1.Init.OneBitSampling = UART_ONEBIT_SAMPLING_DISABLED;
5 h& y3 `, E# j - hUart1.Init.OverSampling = UART_OVERSAMPLING_8;
1 f: P# ^3 w) Y' s - hUart1.Init.Parity = UART_PARITY_NONE;
% K) h$ v- R5 g3 f5 d4 | - hUart1.Init.StopBits = UART_STOPBITS_1;
" Y( \( R$ m3 v! C2 f# Y - hUart1.Init.WordLength = UART_WORDLENGTH_8B;
: U# L g1 c7 D# {0 i - hUart1.FifoMode = UART_FIFOMODE_DISABLE;3 ]0 @! a' h5 V
* t# d' ` O {" x3 `3 Q* O3 q% H- HAL_UART_Init(&hUart1);
/ M7 {5 H0 O% s) L; V
4 _9 u5 z6 P- L- __HAL_RCC_DMA1_CLK_ENABLE();
, f; F- Z4 i/ e- i
: k" K- ? ]3 y3 X7 t- hDmaUart1Tx.Instance = DMA1_Stream0;. F6 a R8 P$ Y C/ x. {
- hDmaUart1Tx.Init.Request = DMA_REQUEST_USART1_TX;
# \0 H1 [4 L. A - hDmaUart1Tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
5 |- v ]: M2 n - hDmaUart1Tx.Init.PeriphInc = DMA_PINC_DISABLE;& W- n6 ^! B! ?
- hDmaUart1Tx.Init.MemInc = DMA_MINC_ENABLE;# j. G' V! a) W+ \: t8 |
- hDmaUart1Tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
! {8 v' w8 q* ]# x/ [0 W - hDmaUart1Tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
1 y, s' u6 I0 A/ Q7 ^* ^ - hDmaUart1Tx.Init.Mode = DMA_NORMAL;
" c2 Z/ S$ K" f9 q% j6 b - hDmaUart1Tx.Init.Priority = DMA_PRIORITY_MEDIUM;, e1 c% }4 g" k8 x/ _" i
- 1 s2 p8 ]9 \" K/ \4 t
- HAL_DMA_Init(&hDmaUart1Tx);( N! D# R: V8 H# _( G
- __HAL_LINKDMA(&hUart1,hdmatx,hDmaUart1Tx);
3 s" ]# E- _& U - $ X% l5 @" w2 o8 c
- hDmaUart1Rx.Instance = DMA1_Stream1; V% d1 \: q' Q, G
- hDmaUart1Rx.Init.Request = DMA_REQUEST_USART1_RX;+ K+ G; \, a T" S
- hDmaUart1Rx.Init.Direction = DMA_PERIPH_TO_MEMORY;: M, t I. z& R$ | S- }0 D! X& t
- hDmaUart1Rx.Init.PeriphInc = DMA_PINC_DISABLE;" X. q3 t7 x) k
- hDmaUart1Rx.Init.MemInc = DMA_MINC_ENABLE;- N0 S3 {, M% P
- hDmaUart1Rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;: g1 I# N0 _# ?% _7 i' N
- hDmaUart1Rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
2 T9 s) }3 X% h4 P, h! r& C - hDmaUart1Rx.Init.Mode = DMA_NORMAL;: ?% j) ]% s: H; Y
- hDmaUart1Rx.Init.Priority = DMA_PRIORITY_MEDIUM;/ P# V: f. o2 |0 N5 _
# ?' e/ r. s D- HAL_DMA_Init(&hDmaUart1Rx);
1 L0 P9 S. S) e0 O/ G, E - __HAL_LINKDMA(&hUart1,hdmarx,hDmaUart1Rx);
( W+ s d0 T( a - * H- M1 n$ S4 ]+ C8 n
- HAL_UART_Receive_DMA(&hUart1,RxBuf[0],RxBufSize);
. E" |8 `2 y9 \: {" N0 [! h: d8 y
. K; @; @; J& }0 E* d- __HAL_UART_ENABLE_IT(&hUart1,UART_IT_IDLE);
! a; k. `$ W. f9 I3 Y! l) c# ~ - HAL_NVIC_EnableIRQ(USART1_IRQn);8 v8 g, A# |+ E* w1 U8 g
- HAL_NVIC_SetPriority(USART1_IRQn,14,0);6 D! y4 @* S# _6 m2 u/ _
- 9 D$ u4 h+ F- O7 h% W% N$ Z
- HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);//Tx
! ?/ m( e8 M' _9 q2 f& | - HAL_NVIC_SetPriority(DMA1_Stream0_IRQn,14,0);
6 ?* V3 y2 d$ J. ~' \ - 7 v; a0 _# n3 A6 i0 X1 }9 q' S
- HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn);//Rx' o7 y7 V: L. A
- HAL_NVIC_SetPriority(DMA1_Stream1_IRQn,14,0);
& x- }/ B9 Y# m2 \' B8 \ - & ^) P; M" p" \6 ^1 _
- Uart1RxCompleteCallback = RxCompleteCallback;
f8 y% ~9 {3 S4 _: q+ ?# O - }3 L9 n; [: J3 @! Q
) W/ e( v/ T, X; c2 d" d8 P- void HAL_UART_MspInit(UART_HandleTypeDef *huart)' Y% a. U, l- N
- {
* n. V! x+ j* r2 F: e - if(huart == &hUart1)//串口14 f- }1 e: j, V
- {
2 J$ L1 h' V* f2 N' K+ r; g: b& y - GPIO_InitTypeDef GPIO_InitStruct;$ i, y5 `5 {' e# |+ K- J& f4 i/ o
% p* q- G6 p* @8 M# G2 H# m! `8 e- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;: P! A( F% M }4 B+ U; R
- GPIO_InitStruct.Pull = GPIO_NOPULL;
+ z& K" u# @& H+ k - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
2 _9 C( D" z9 ?' p S* | - GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
6 f" r' P0 m/ H, ]7 [$ c - GPIO_InitStruct.Pin = GPIO_PIN_10 | GPIO_PIN_9; W" C* v8 Z0 @! H
- * h/ d/ ^ T# U
- __HAL_RCC_GPIOA_CLK_ENABLE();
( C9 Q( d, H e9 z* l; G - __HAL_RCC_USART1_CLK_ENABLE();
) V. P' F% C. O0 Q8 j- F - ) h/ `7 t* j5 K
- HAL_GPIO_Init(GPIOA,&GPIO_InitStruct);
* x2 k2 J; _# x3 H1 z4 M5 d - }, W9 l c* _5 n. \7 D1 Q
- }, y# n9 T ~8 Y3 R, c0 J
$ e! [2 N! m; N1 x% c- void Uart1TxData(uint8_t *pData,uint16_t Count)8 O5 A% D- J, {$ `( y/ C/ h
- {
% h9 ^/ k4 j& t" o - if(Count)
9 E. I. v+ E; s) n - HAL_UART_Transmit_DMA(&hUart1,pData,Count);" w3 p- q1 f& u5 D# ^
- }0 d1 p- ]# V# @0 X$ o2 `
- - ]3 s2 t$ `2 h2 m
- void USART1_IRQHandler(void)
l% H3 I3 K& `( J4 B; N - {( s1 N7 h/ b2 n% @+ u( r7 c/ z" z
- if(__HAL_UART_GET_FLAG(&hUart1,UART_FLAG_IDLE))
$ p* j9 J3 q! O m! Y1 O. |' a - { G( X$ \6 ]0 a, p
- static uint16_t count;
: z1 z5 Z! X( U$ R. S- t. F7 D - __HAL_UART_CLEAR_IDLEFLAG(&hUart1);( R6 [9 _1 }; I
- if(Uart1RxCompleteCallback)
0 \& H; _- `, U - {
9 M% e" c" K3 B - hUart1.RxState = HAL_UART_STATE_READY;% t3 a0 u$ t2 V" j9 _0 P$ a
- hDmaUart1Rx.State = HAL_DMA_STATE_READY;) F3 ?9 f2 {, B" z9 T% I
- HAL_UART_RxCpltCallback(&hUart1);
8 {4 d: f3 ~" t% p% m; R; S - }
# z1 z$ g. [; K- y0 m, n - }
; H t0 O5 k" k; { N - else
' C* }4 C4 |- V+ Z$ P* r) x s) P - HAL_UART_IRQHandler(&hUart1);
: I, X; s' b# d+ Z4 v - }
' i& j2 h ]3 g' h) V( d, |
- m( h* c/ I: i& h2 I- void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
/ q- |9 \$ J- M3 ^9 i: e - {
) A6 Q b; A: \. a; b - if(huart == &hUart1)
$ E5 I3 o# |8 Q( `! @" E6 k - {
; w0 t" u1 U3 ?' y3 B: q. p1 w - static uint16_t count;
( ?& ]- i+ Y3 M7 I5 c - count = RxBufSize - __HAL_DMA_GET_COUNTER(&hDmaUart1Rx);
# M* m; ]* x3 _0 e7 @# l* g U4 O7 L - if(count == 0)return;
& ^+ J$ G( R& ` - hDmaUart1Rx.Lock = HAL_UNLOCKED;! O' m# y" V& L) j, F
- if(huart->pRxBuffPtr < RxBuf[1])% o* a5 w; g$ `
- {' T$ ?$ j U* y/ o
- Uart1RxCompleteCallback(RxBuf[0],&count);; j* s4 E% G7 z- t6 G1 S
- HAL_UART_Receive_DMA(&hUart1,RxBuf[1],RxBufSize);
3 H5 A& C* m( R% j- E* q& r2 @; v - }
8 t7 f a3 j0 Z/ M - else1 K3 q1 R) k$ r& ]# k0 Y- E) I
- {
+ s ]# h; Z6 s- H3 M - Uart1RxCompleteCallback(RxBuf[1],&count);6 T4 z: m# E l: P
- HAL_UART_Receive_DMA(&hUart1,RxBuf[0],RxBufSize);
/ c& E+ h* b- Y8 z. Q: o - }7 ^3 T9 T/ m8 F/ y5 ?) v7 ?
- hDmaUart1Rx.Lock = HAL_LOCKED;' L" v9 z7 q) ?( I, b- S4 ^! S
- }- \4 v7 _' d, x, Y
- }/ i9 B1 T# m: P S c1 `
' v: K2 x6 q8 j7 N2 }. m; T- void DMA1_Stream0_IRQHandler(void)
% y3 Q' G; h! k Y. t - {% \2 r8 k" N5 J) z3 r$ F: y
- HAL_DMA_IRQHandler(&hDmaUart1Tx);
5 U& z8 ~, k* H1 k" J) L - }
" A5 K, D, n4 z, _ - 2 |$ u0 W8 w# @0 {' v+ p8 z
- void DMA1_Stream1_IRQHandler(void): Y; ]% P$ v" m8 Y
- {
. H) H" T; P+ Y8 o3 d: s+ m% D$ s - HAL_DMA_IRQHandler(&hDmaUart1Rx);% a7 i5 m% _8 ?5 O( _' U2 D' C" I
- }
复制代码 * m% t; |4 D$ p, ~. g# F" q* @
这个是Uart.h文件
7 K& m E7 s: Y& f4 _; k* G' P
$ r" ?, m3 S6 D! w- #ifndef __Uart_H_
0 Q* Q7 [( N g' g - #define __Uart_H_
( v* f2 r$ A3 _( \ - 6 C$ M& E. b. c
- #include "stdint.h"
3 u4 d6 I1 j' A: Y! D8 D
6 z( q% ~9 C+ S1 q: S# h- void Uart1Init(uint32_t BaudRate,void (*RxCompleteCallback)(uint8_t *pData,uint16_t *Count));
3 b8 {* w2 {4 d# H# z: P, S0 u - void Uart1TxData(uint8_t *pData,uint16_t Count);" V( \5 L4 B- z( u! d8 m+ E
- $ u6 o6 ^; [$ [
- #endif /* End __Uart_H_ */
复制代码 ; t4 f( B- ~2 r: d
这个是应用文件,实现了把收到的数据在发回去的功能。+ b% B3 T! C" f X9 B9 W& ^
5 ^) Q; @/ q+ X$ Y# C: ]
- #include "Uart1Task.h"
+ V. M" @$ R+ b4 h0 u - #include "limits.h"//ULONG_MAX
5 A j0 V) A, | - #include "Uart.h"8 s& ~, E/ w/ c$ a5 T" T5 y
- #include "string.h": E( ~( e! W X$ f3 M3 b# ?' z R
- #include "SystemConfTask.h"
9 w* b: J' m* l8 N) r( B - 8 r) _5 O- o# u' s
- #define Uart1RxCompleteFlag 0x01
0 z& F8 \, Q/ s8 U" v
9 ]4 A" _% J' @: W- static uint8_t *Uart1RxData;2 {5 [# b4 J3 Z- A" m4 F% R1 r
- static uint16_t Uart1RxCount;
$ v* B/ p7 }" m2 m - TaskHandle_t Uart1TaskHandle;
G1 i& T% O) i! b5 M - ( \" w" N# L4 w" C* [/ w8 R# z- ]
- void Uart1RxIRQ(uint8_t *pData,uint16_t *Count);& ^. ^. ]9 x- E
- ; G/ N# o$ y0 K1 t9 f4 l
- TaskHandle_t *GetUart1TaskHandle(void)
& g. s3 y: C4 L5 ~ - {" p4 m5 |9 h( Y: P9 A- \; [
- return &Uart1TaskHandle;
' ~2 X8 ^; A" o+ q1 j& O - }7 ?. A# s: W4 e9 w! C/ u
- * f! B& @! [' b* F1 f( P' j* ]
- void Uart1Task(void *pvParameter)0 U) Q! j0 A( `3 O1 O# d) r
- {$ W5 R4 a. `1 l, L
- Uart1Init(115200,Uart1RxIRQ);" }0 L! W8 Q9 q" o- Z
- while(1)
" I+ o' \" @2 W+ j" i* Y- [( ~2 M - {3 B. b _$ S& u+ F
- uint32_t NotifyValue = 0;
^; i/ N/ z7 j2 O - xTaskNotifyWait(pdFALSE,ULONG_MAX,&NotifyValue,portMAX_DELAY);
1 z( {* D3 R2 [ i+ N$ P/ s - Uart1TxData(Uart1RxData,Uart1RxCount);
& d7 {5 G+ b- ^7 f - }& W2 |( O: B+ g& |7 {
- }
4 K, d2 j( Q* S: t - 3 `3 ^$ z$ T6 N9 j
- void Uart1RxIRQ(uint8_t *pData,uint16_t *Count)
; t: J4 g# r1 D - {5 f1 x/ f( J& a
- Uart1RxData = pData;$ ^" T% o$ _* q
- Uart1RxCount = *Count;
, w: {/ {+ d! ]5 i5 ? - BaseType_t pxHigherPriorityTaskWoken;
4 p+ U2 _& n z. d I- f$ J - xTaskNotifyFromISR(*GetUart1TaskHandle(),Uart1RxCompleteFlag,eSetBits,&pxHigherPriorityTaskWoken);
/ F6 U+ J+ y8 R y' b i [$ c, H - portYIELD_FROM_ISR(pxHigherPriorityTaskWoken);
' r' i: D) \" W# W! E1 L - }
复制代码
! M8 @ _: ?( R2 H- ]串口驱动里做了一个双缓冲的,防止大量数据出问题1 v2 _. Y' ~7 E% p u, L& Y7 w
& B2 A f. D" P* }1 v$ {9 Q
- J! I1 S2 D8 D( z& e& K+ X/ P |