前面完成了STM32F7实现ADC采集(软件触发+轮询),但轮询的时候CPU得不到释放,在此基础上,这里实现DMA的传输。# W6 W( Q$ L G
由STM32F7的中文参考手册可以知道,ADC可以使用DMA2的数据流0:+ l0 R: } Z: Z# ?" J5 P7 p
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0 ], f- k$ y& Y1 y使用CubeMX配置DMA:
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; f9 T! q; a- J- f) L- m! Q$ Z6 aadc.c内容如下:
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- #include "adc.h"
, ^6 c! A; t% T4 F - #include "delay.h"$ @8 C0 l$ L. _# B
" r$ v* {1 O0 P- ADC_HandleTypeDef ADC1_Handler;//ADC句柄- O" o7 Y: p7 _* q, [
- DMA_HandleTypeDef ADC1DMA_Handler;
) Q6 T" Z* n: M# t6 ] - ADC_ChannelConfTypeDef ADC1_ChanConf;
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- uint16_t buffer[128];
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- /*下面的函数写完才发现没有用*/
5 B# P+ m9 S6 i; @8 Q$ Y - //void ADC1DMA_CpltCallback(struct __DMA_HandleTypeDef *hdma)
! a+ `( m( U! {$ W( w( t( t! H - //{
+ j( f9 i6 `1 @$ [( D2 _8 d - // printf("DMA transfer complete\r\n");1 e" h) u% q( s+ Q
- //}, \1 e9 r: t/ R5 `0 Z5 S$ U/ v7 M
- //void ADC1DMA_HalfCpltCallback(struct __DMA_HandleTypeDef *hdma), e O$ e: b, R% E: k/ P
- //{" h9 f+ F) G9 O e
- // printf("DMA Half transfer complete\r\n"); c0 M' Y0 U3 Q5 k
- //}2 n& _; E! u' P& Z
- //void ADC1DMA_M1CpltCallback(struct __DMA_HandleTypeDef *hdma)
& ]! N' A+ Q. s- V6 D3 M% k& w - //{
8 c1 n9 v% e' E# ~2 |/ r - // printf("DMA transfer complete Memory1\r\n");" O1 Z D: ~: d6 [/ B$ S( K0 Z
- //}
2 p2 o5 {( o3 U% Y; x G - //void ADC1DMA_M1HalfCpltCallback(struct __DMA_HandleTypeDef *hdma)
5 V) N+ [0 c& R4 D t3 O; `& Q+ d - //{0 K7 Y. A! `) G" S4 m. D5 f' O9 E
- // printf("DMA transfer Half complete Memory1\r\n");% t0 C7 T4 y4 R3 Z+ E
- //}
) `7 R! D3 q" O7 H: u. ~" g( e - //void ADC1DMA_ErrorCallback(struct __DMA_HandleTypeDef *hdma)
. q/ v, @' r& B- \5 r( q* Y - //{
) a$ J7 ~/ ~$ _! @) r# i# N1 E - // printf("DMA transfer error\r\n");0 l0 d' X! l: d+ U W' i
- //}
9 |2 z! E* D1 Y. A4 y9 }6 u f - //void ADC1DMA_XferAbortCallback(struct __DMA_HandleTypeDef *hdma)" I+ M0 ]! N5 C# W0 X, y
- //{: N9 c& Z( S6 ^8 v# X- @
- // printf("DMA transfer Abort \r\n");
2 x2 T- L b0 d7 Y" V - //}0 a! m$ ^1 P! [' g1 Y8 o5 a9 e
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9 W) k# Y' p4 _7 R- //初始化ADC8 t" Y* J- t3 a8 y r
- //ch: ADC_channels
6 I9 E9 c; ~- m) c0 Q& f - //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_165 H2 ~2 [) P2 y8 f
- void MY_ADC_Init(void)
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- __HAL_RCC_DMA2_CLK_ENABLE();
2 P( ^$ h/ Z& ]- s. L, z, J- z/ N - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);9 s8 L2 S% s4 K4 \- @9 o0 `$ a
- HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);! G; E. g5 [; @+ L& m
8 Y. L7 i: |" E. o M- ADC1DMA_Handler.Instance = DMA2_Stream0;# S. l w) R# C9 {/ r* p n; j
- ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;0 K' {! q- \! x n$ z& N
- ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;% ]0 A }5 a4 O0 X$ x7 I U6 Z, o- b
- ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
4 a0 a/ |7 B% ~- w3 M( e - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式
3 B, ]' _9 B1 ^* L- t - ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位5 C+ N7 E2 G5 Q+ q' {
- ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位' R6 @3 E( D' D
- ADC1DMA_Handler.Init.Mode = DMA_NORMAL; //传输一次就结束" w& R2 {2 O5 c4 ]
- ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级# D; P& d9 j9 e3 T/ p
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/
6 a* q* U6 k+ I9 b# [: Y - /*自己增加中断回调函数*/
1 A0 U1 J. |4 U9 e- a - // ADC1DMA_Handler.XferCpltCallback = ADC1DMA_CpltCallback;
" E9 G3 x+ z' w& j6 l5 H - // ADC1DMA_Handler.XferHalfCpltCallback = ADC1DMA_HalfCpltCallback;
5 `: `& Z$ i' |4 _- ? n - // ADC1DMA_Handler.XferM1CpltCallback = ADC1DMA_M1CpltCallback;# Z( Q* N! c9 L/ \5 s( S
- // ADC1DMA_Handler.XferM1HalfCpltCallback = ADC1DMA_M1HalfCpltCallback;
. p. _1 W3 _) ?8 K# Q, N - // ADC1DMA_Handler.XferErrorCallback = ADC1DMA_ErrorCallback;0 x. n1 i4 S5 r: U+ y% Q, Y0 l
- // ADC1DMA_Handler.XferAbortCallback = ADC1DMA_XferAbortCallback;
4 }5 T- j/ X4 a, C5 m- s; d5 S% R1 H - /*最后发现并没有什么用*/+ H% E7 O$ n$ h- K, D8 m" d
- HAL_DMA_Init(&ADC1DMA_Handler);. y3 l7 W/ L3 n3 ?
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- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
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- ADC1_Handler.Instance = ADC1;
% s* X- t. Q0 a8 u. Z9 S, { - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ$ ?6 E; _$ Y( R. i9 d: ?; r3 q
- ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
2 L6 S- W0 t4 O9 ^ - ADC1_Handler.Init.ScanConvMode = DISABLE; //非扫描模式 Z) _0 s" [) _1 Z: q/ O- `7 g
- ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换' ?% q! S/ ^' @: {1 n" D2 R
- ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式 x# I$ G& B$ P! P: v
- ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用软件触发$ a* ?% D" A. d( N& J0 v
- ADC1_Handler.Init.ExternalTrigConv = ADC_SOFTWARE_START; //软件触发
9 y" k. x# o: c" R* a0 S - ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐. x$ \. r) H, Z# N
- ADC1_Handler.Init.NbrOfConversion = 1; //1个转换在规则序列中 也就是只转换规则序列1+ U$ L2 R8 t' b6 x
- ADC1_Handler.Init.DMAContinuousRequests = DISABLE; //关闭DMA请求
t' e- S1 e4 F a - ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV; 7 Y( A2 K; N! l3 |7 u1 K0 `
- HAL_ADC_Init(&ADC1_Handler);
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, a* S' i: ^5 o0 _' L! B- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道& Y- k. }; B9 l' T
- ADC1_ChanConf.Rank = 1; //1个序列8 w$ _" L1 f: Z% m* @
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间& G7 i$ Z6 J3 Z5 f3 A
- ADC1_ChanConf.Offset = 0;
6 L, y8 L2 K1 C1 |+ \ - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置! f1 [5 D0 |% W! ]+ V9 }7 [
4 l4 f, o/ j, i) m, {0 G; L- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 1);9 c4 ~2 g% F: h% g9 ~& i
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- 0 r7 ], M$ C) g! C N/ C2 M
- //ADC底层驱动,引脚配置,时钟使能
# [4 q+ x9 e: u8 x$ T - //此函数会被HAL_ADC_Init()调用1 e) {0 K5 ^+ \
- //hadc:ADC句柄
1 Y+ [. y( P7 Q. ]* U! W - void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)
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) d! U3 y! q5 W2 k - GPIO_InitTypeDef GPIO_Initure;/ c+ Z+ D4 S: N- O- }9 D
- __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟5 y f0 e# k) F
- __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟
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3 ~& v% r; b* Q" O( J) G# F; h- GPIO_Initure.Pin = GPIO_PIN_5; //PA55 |# R' v p$ ]0 Q; A6 I; G+ V$ D x
- GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟- c/ ~2 @: V9 b- }5 E
- GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉9 h' n' u: w" v
- HAL_GPIO_Init(GPIOA, &GPIO_Initure);. W% {1 D K$ i
- }
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* A; D% y& J! n z- void DMA2_Stream0_IRQHandler(void)( f y' F) \4 T! q3 Y) ? b: M
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- HAL_DMA_IRQHandler(&ADC1DMA_Handler);
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$ ^$ v0 ~$ ~' O1 v+ Q- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)3 e4 l/ A8 f" E1 F& @2 B) m
- {# X; q5 E( X! |6 \3 Z; n, Q Z
- printf("DMA transfer complete\r\n");# n1 J% Y. J- q6 w$ O
- }; p0 a% M# C _: `9 n- |
- void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
$ O. G7 b2 r" ~' y# t - {
( j+ h: y& I# i2 i' H( b! v - printf("DMA Half transfer complete\r\n");
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- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA transfer error\r\n");. {) [9 X7 x+ L: ?7 ~, A
- }
复制代码
8 d9 u9 M& q$ [: f! {! L: | `注意,代码里注释的部分是,虽然我们在对DMA初始化的时候,我将DMA相应的回调函数参数都设置好了,但初始化完成之后,其中有三个函数并没有指向我们设置的函数,而是指向了具有__weak属性的三个函数。) y( R8 f5 X. G3 N3 D3 B0 y$ I
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这是因为在进行ADC初始化的时候,重写了ADC使用的DMA的回调函数。4 Q& p& N( F; \% D
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所以最终是直接重写三个函数就行了,不用再去设置。5 ^! l) t7 j, m6 T
" `( `* N! U, ~* a O* V( ~1 Kmain函数中也不需要去调用,直接打印数据就可以了。
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- #include "sys.h"0 P# b6 K% {, P6 |+ {
- #include "delay.h"# s! `' ^2 d1 W
- #include "usart.h"
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- x+ u" C7 z: x: `7 A6 ]1 d- #include "adc.h"
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+ [+ V) A' o; n) A- extern ADC_HandleTypeDef ADC1_Handler;//ADC句柄* C$ {* E( r& a: Y, f
- extern uint16_t buffer[128];& r7 e# V7 E! F f- l5 U c8 Z
t3 w$ {; _, L ^: C, @- void show()9 @% d3 C1 z9 n, d- q2 Y# }
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- int i;
5 C$ Y: N8 q2 v$ E - printf("\r\ndata:");
0 L' s* g. ]. ?+ _( n2 X - for (i = 0; i < 128; i++)& u7 K$ R g! b7 e
- {. K: L. T ]% S+ k: |+ n
- if (i % 16 == 0) printf("\r\n");
, Z) x$ u+ F' [7 J - printf("%6d", buffer<i>);5 A- d* U/ o6 D0 i# e. D
- # e. ~6 ?% u: \6 p8 ^
- </i> }' L$ q4 h3 A* d+ e
- printf("\r\n");# P1 L* y2 z1 `. L( ?" h! ?, ~! V9 W
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3 A/ D0 M1 o1 a5 [( ? @; P- int main(void)5 b- M" {# W& ^' m
- {
- u @) R1 R7 F. ~+ l - Cache_Enable(); //打开L1-Cache; Z7 S5 N8 ~& j) V( f: J" b
- HAL_Init(); //初始化HAL库- s! A8 \! S2 o; J& Y8 M
- Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
4 G2 h" C$ P0 | - delay_init(216); //延时初始化
% [& h1 s4 D6 N+ L - uart_init(115200); //串口初始化4 i7 _8 C2 x- z* ?. E# a
- ; s0 r' ^0 g: D! U2 {& @( d6 k
- printf("start\r\n");
Z- @' I Q- c p8 o* N1 g: O - MY_ADC_Init(); //初始化ADC1通道58 h" A& A! o; @" ~$ M$ A( l
: n/ ]0 V' n6 y! v% b- while (1)
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- show();
6 v# l: _9 v' b H3 P% \ - delay_ms(1000);4 O3 Z/ }6 \% V
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- }
复制代码 / A: k& t6 Q3 V! F% s/ x
实际打印结果如图:
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当我们需要进行多个通道采集的时候,先修改CubeMX配置,改为扫描模式,修改规则通道的转换数目,修改相应的Rank内容:
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) d2 [. b! s# f* E0 Y& R! s生成完代码后,启动函数长度修改位转换长度:
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- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 2);
复制代码 / A: L. l! h* [9 o( g7 P
修改后的ADC完整代码如下:( v1 U$ T. ?. ~
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- #include "adc.h"
D3 p, {5 G6 K# j' O% v( Y - #include "delay.h"
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- ADC_HandleTypeDef ADC1_Handler;//ADC句柄. w* [: w' { d6 R; Q8 Z' g; C
- DMA_HandleTypeDef ADC1DMA_Handler;
$ o0 z; S) ]; {& O - ADC_ChannelConfTypeDef ADC1_ChanConf;4 |3 @; ]3 T ]
/ b1 g+ k: B' Q' Z; M5 F- uint16_t buffer[128];
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& C4 ~5 m2 B% r* D* n! F- //初始化ADC
4 Q F! v1 J! u" f) ]5 E - //ch: ADC_channels
$ n: y& L$ V6 W/ p4 C5 c, F - //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_160 T% ^7 F, }' \2 X' ]
- void MY_ADC_Init(void)2 `! Z9 Z3 M! W" m; `
- {
0 F8 w0 p( Z: C1 N0 L2 T6 ^. _' U - __HAL_RCC_DMA2_CLK_ENABLE();
% a; u( D$ K' F7 @# W4 h4 ^. Z6 }) y - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
2 E+ f6 I0 c3 b6 ?' y1 T; E7 Y2 h+ w - HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);/ L3 j X8 ?2 @) Y- d* _2 G
+ A4 ]# O0 G- M) V( i- ADC1DMA_Handler.Instance = DMA2_Stream0;
7 z# f2 W+ A& x; a, S3 _& t* A7 D - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;3 h1 c' l, X5 \) b7 I
- ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;- y' ]3 [# n+ q. z4 @- q
- ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式& Y @! @2 t8 A' F( {
- ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式
; s* B+ m% e: A/ x* V0 o - ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位7 O& b4 i6 d! t$ {7 x S
- ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位* f+ j; K& @( r' U
- ADC1DMA_Handler.Init.Mode = DMA_NORMAL; //传输一次就结束
" B% |* ?# S9 m& P' h. S/ N. F# Y - ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级
- a/ S) l5 V0 R - ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/! s6 ?- W) }! d2 J2 Z ~
; v' V, a) X& B. C4 j& _& K- HAL_DMA_Init(&ADC1DMA_Handler);
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- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来 r& H f% X5 g9 X4 L
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& m \ O7 {$ T) r- ADC1_Handler.Instance = ADC1;" T2 G2 h7 {5 L; Y& I7 n2 x
- ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ
/ x" N; M3 i+ q% e5 E - ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式, r4 v/ v2 D5 [; Q( W$ Q" r
- ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式
# _" o. o3 Z [ - ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换
, C. `( L) }" C( m1 k - ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式6 D' O7 B& m) E+ N" r) P) H* ~% Y
- ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用软件触发8 B3 Z. f) ?6 g3 I
- ADC1_Handler.Init.ExternalTrigConv = ADC_SOFTWARE_START; //软件触发7 y2 C3 s3 S3 g4 k1 O, S
- ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
! W) a* K* I) q, t - ADC1_Handler.Init.NbrOfConversion = 2; //1个转换在规则序列中 也就是只转换规则序列13 i, P2 _! P9 a$ c0 u" z
- ADC1_Handler.Init.DMAContinuousRequests = DISABLE; //关闭DMA请求" E6 }3 w0 v1 L! C) Y& D2 @
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
+ @ S9 S V3 j6 a - HAL_ADC_Init(&ADC1_Handler);' M5 r w( r6 f0 @ c7 H
/ b$ i1 h. I# I6 d7 c! p- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
$ t0 M2 I, L7 P! J! @4 ?( ?/ A* b - ADC1_ChanConf.Rank = 1; //序列19 {" A6 F) E8 o% j3 ]
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间, v/ a4 x0 x+ D" L4 J _6 `& R
- ADC1_ChanConf.Offset = 0;: @1 y. g0 ]# b( U ]. |
- HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置3 x4 m' `. u1 e
3 O" {) d) `: c- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道
0 C0 N$ V' x0 W3 W- ]& j - ADC1_ChanConf.Rank = 2; //序列2
4 F0 a5 ^1 z) \/ x - ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
, r4 v0 T& w ~# Q- J - ADC1_ChanConf.Offset = 0;% t2 q- p7 [% E: ^4 K1 ~
- HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置$ P' H2 a8 I# y) R
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- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 2);
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- //ADC底层驱动,引脚配置,时钟使能
4 U+ [: D/ s0 D U: _$ e - //此函数会被HAL_ADC_Init()调用
) }" H( F& b' \* E3 ?* c - //hadc:ADC句柄. e: r( c; ~/ y, Z
- void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)3 |7 q- h! R# u \
- {
: P3 ?. X, w/ U8 T4 |8 l - GPIO_InitTypeDef GPIO_Initure;( V9 _9 H* U) X J6 A
- __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟& c( c4 X. J" b0 _7 m) W# J
- __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟1 g. m" P# d) R( e! i4 S$ I
9 |' l) t$ }% i, ?8 H' m t- GPIO_Initure.Pin = GPIO_PIN_5|GPIO_PIN_6; //PA5. I# U- Y! m+ J% U+ X! S$ O
- GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟3 J5 m4 l, H% U
- GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉8 I! g, u2 j$ `
- HAL_GPIO_Init(GPIOA, &GPIO_Initure);
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- void DMA2_Stream0_IRQHandler(void)% @# s: c: e6 L6 i5 \
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- HAL_DMA_IRQHandler(&ADC1DMA_Handler);7 h! V6 W3 k6 ] t/ Y
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- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA transfer complete\r\n");- q ?2 R2 `" l+ v
- }
% P) w; l# \$ C - void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
7 }, [4 F: f8 I8 J7 l - {
7 P! J7 C- V$ r: V: g - printf("DMA Half transfer complete\r\n");
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2 q: z8 I' I1 w& Z4 A- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc); z# s6 @* Z, v4 S9 a
- {
3 z3 w, a: n& h- S) p; I - printf("DMA transfer error\r\n"); V; ^2 h' g! f9 u4 k3 a- q
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复制代码 3 s. s y% y8 Z' C+ v/ k
效果如图:
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