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。
2 ^& {; X# J) R0 ]. q由STM32F7的中文参考手册可以知道,ADC可以使用DMA2的数据流0:9 O1 w/ M+ \3 T7 ?9 W
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使用CubeMX配置DMA:9 X6 |6 d/ m5 p) x3 B
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adc.c内容如下:
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- #include "adc.h"
5 e4 ~( g9 b4 L; n+ c/ w& s6 f- k - #include "delay.h"- z$ M+ z+ U+ E$ [
" D" w4 f8 N; c! k# V# H* q0 ~4 m+ s- ADC_HandleTypeDef ADC1_Handler;//ADC句柄2 |3 |3 v; B3 P/ V+ H4 V
- DMA_HandleTypeDef ADC1DMA_Handler;" f4 N" j1 @! R1 h" T h) ~9 q
- ADC_ChannelConfTypeDef ADC1_ChanConf;! d. p: G! [1 L- y$ i
- ; K& Z6 F+ C0 I' i" \
- uint16_t buffer[128];
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6 {8 h: |2 z# F- /*下面的函数写完才发现没有用*/
( w7 y" b& f# N. d" M) ?! \$ i1 T0 G - //void ADC1DMA_CpltCallback(struct __DMA_HandleTypeDef *hdma)6 B3 C Y* \: G% b$ K0 B
- //{1 r, p" {2 r# `6 j, T: G
- // printf("DMA transfer complete\r\n");
+ s5 l) R7 A4 U/ w - //}
6 ~" A! }. w$ W# }6 X: T - //void ADC1DMA_HalfCpltCallback(struct __DMA_HandleTypeDef *hdma)
& X9 g$ x; l1 O- p* B4 f - //{
8 i8 _' I# H, {. X$ r - // printf("DMA Half transfer complete\r\n");* D8 d, x+ J8 T7 l0 r. c9 C
- //} u$ z D6 r3 C6 B) k
- //void ADC1DMA_M1CpltCallback(struct __DMA_HandleTypeDef *hdma)
1 z- _! c. x) ^9 _$ E% V% J - //{* f# |* \( V' w( s9 l% r$ l
- // printf("DMA transfer complete Memory1\r\n");5 B: n( \8 f) O0 S( i5 }
- //}
* x' N$ o: _$ E2 \- ]4 h - //void ADC1DMA_M1HalfCpltCallback(struct __DMA_HandleTypeDef *hdma)
4 {" A/ O3 i0 u; f- X/ @+ c - //{
' k. j0 ^9 h+ Z7 R5 _1 z - // printf("DMA transfer Half complete Memory1\r\n");$ |- R2 G/ D; a/ ]; R4 K" Y
- //}
0 Z- l" q/ F' Z - //void ADC1DMA_ErrorCallback(struct __DMA_HandleTypeDef *hdma)9 ?( K, K& \% v9 ^4 t N8 S& X
- //{& d* R& q) O9 N, t9 j) M. G! y0 r
- // printf("DMA transfer error\r\n");7 Y' v) j* \5 t) R" W( b6 V
- //}% r# U% `9 ], B
- //void ADC1DMA_XferAbortCallback(struct __DMA_HandleTypeDef *hdma)) y0 M0 i8 n7 i: m* [& v9 p
- //{
& p8 {, y8 J! Q/ J1 r- X r - // printf("DMA transfer Abort \r\n");
# Q8 l9 ?: H0 o' i, p. J7 ]0 y- C/ W - //}/ ~0 G' y& l, z/ y/ X3 N& Y; t* ~
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- //初始化ADC" {4 Y- O* M7 b2 Z4 U7 p; n# I5 C
- //ch: ADC_channels
+ s2 q' h9 a! N. Y# L - //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
" y: K# }* R% |7 S - void MY_ADC_Init(void)6 v' E" _2 I8 c! x; C
- {
2 i6 E" U$ m* H( h) p$ \; ` - __HAL_RCC_DMA2_CLK_ENABLE();5 o- ~% p- {1 I ~* _5 M" U0 m
- HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);2 g h/ @1 L6 s. u& E+ M& N* l5 Q9 @
- HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
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2 [* u6 h/ z+ z# i2 N- ADC1DMA_Handler.Instance = DMA2_Stream0;
% T9 a" `! p1 t! g d) D2 U% L* e - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;
/ {9 D; B: ]& ~/ ~3 I - ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;! T. j0 M1 |5 \0 }3 B; m
- ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
5 `' X" F" }/ Y( q# Z! A - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式) e1 S8 [( b5 w7 w1 M" b( q/ v
- ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位
n C% |6 F- }# r4 ] - ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位: ^' u6 w3 S# E# d; S# U
- ADC1DMA_Handler.Init.Mode = DMA_NORMAL; //传输一次就结束
5 W" Y% S3 w% x' a% o1 q - ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级' c2 f# ~' F; L/ ]1 a$ ?1 c" R
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/
- p5 c6 e9 t) J - /*自己增加中断回调函数*/9 i8 f) b" t1 h h( c+ G/ h' G4 U
- // ADC1DMA_Handler.XferCpltCallback = ADC1DMA_CpltCallback;
. o+ g. _5 y& _ - // ADC1DMA_Handler.XferHalfCpltCallback = ADC1DMA_HalfCpltCallback;" K: v* m( ?$ T# S; J+ I
- // ADC1DMA_Handler.XferM1CpltCallback = ADC1DMA_M1CpltCallback; E9 K3 U, M) n- \: p/ @
- // ADC1DMA_Handler.XferM1HalfCpltCallback = ADC1DMA_M1HalfCpltCallback;* f' J7 p; w; _2 d# N- v
- // ADC1DMA_Handler.XferErrorCallback = ADC1DMA_ErrorCallback;* ]9 J1 p3 T( A e/ ?% D8 U
- // ADC1DMA_Handler.XferAbortCallback = ADC1DMA_XferAbortCallback;
; m; x9 N( a" p! T0 H8 S. @ - /*最后发现并没有什么用*/. Y1 v/ W0 o3 n# S
- HAL_DMA_Init(&ADC1DMA_Handler);( R) O- p' a8 ]% A! L
- + e4 t! k5 Y0 }+ t+ w+ ~# ~; {
- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来( |" r7 z9 b# J
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- ADC1_Handler.Instance = ADC1;
( Q; s! ]3 Y% ?5 t+ Z - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ3 t+ B# s" U2 t2 w# g
- ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
# V8 L3 \5 o( A* s+ n( v; K - ADC1_Handler.Init.ScanConvMode = DISABLE; //非扫描模式' [* `+ q+ m2 `0 g# T- W( h1 e/ P6 d
- ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换( s7 @" ]" m( Y# q ]0 H
- ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式
/ i5 ?* X9 H# c' c: H4 f+ \% _; {. G - ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用软件触发# i \0 u8 `3 t5 w3 g7 J
- ADC1_Handler.Init.ExternalTrigConv = ADC_SOFTWARE_START; //软件触发9 }) P M- c6 N7 s/ T0 P2 m
- ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
3 B1 N" F3 {& Y" {# R - 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: ~- y: w. |. h7 |
- ADC1_Handler.Init.DMAContinuousRequests = DISABLE; //关闭DMA请求! {7 O' P& z/ D3 z, D
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV; 4 t) y+ c; n& w1 u0 b: C1 h( w
- HAL_ADC_Init(&ADC1_Handler);
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5 o6 u& E7 k) l. k) F* _. Q- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
9 M: U* h6 a! K' f% |% m4 t& \ - ADC1_ChanConf.Rank = 1; //1个序列! z$ ]0 x/ I9 N: n
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间! j4 J& h1 n4 `3 R
- ADC1_ChanConf.Offset = 0;0 _) m* S2 `* f: r
- HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置8 Y' N6 V. Y1 S; u8 x
: V' v- y* D7 Q4 z- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 1);
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0 W- L) N+ u7 i- //ADC底层驱动,引脚配置,时钟使能
0 W. k* G6 Y; ^0 ^; f - //此函数会被HAL_ADC_Init()调用# r+ S& m7 T. k- Y$ B
- //hadc:ADC句柄% f) a k" j' s+ Z& G5 m
- void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)
, y* H+ T; x, H5 H - {
$ Q4 a, p4 k- d7 B0 @- v2 P6 C - GPIO_InitTypeDef GPIO_Initure;
' ?4 V4 k2 Q0 W2 o8 u - __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟
% A5 K5 |3 m# x0 C1 i - __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟6 e9 ]! A% m$ v) y
0 C! V( S; x2 Y3 ~2 S% U% K- GPIO_Initure.Pin = GPIO_PIN_5; //PA5
* H Y- V8 n# u* h - GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟
4 E. f. x3 w' l+ H w - GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉
2 f6 R6 A) S7 ~+ ]& k - HAL_GPIO_Init(GPIOA, &GPIO_Initure);) p" y0 W' i, r r: t2 a, w
- }
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9 ~: d- d, |% t4 v+ K2 f6 f- z- void DMA2_Stream0_IRQHandler(void), [* x2 k9 A& q+ N3 U
- {
5 d. d/ ]2 b3 [# [( I - HAL_DMA_IRQHandler(&ADC1DMA_Handler);9 t6 P6 o& @: P9 c
- }
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) `# B0 \1 e& L0 n- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)- F0 A1 t: j/ u) j
- {
! @3 b' L, I4 p4 w- K! |" X - printf("DMA transfer complete\r\n");) C% G$ ^- S4 D {
- }
* o$ Y% U1 ~+ t( O( x5 a - void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
: Z- W7 q0 O0 s; J! { - {
$ b/ a9 e6 {9 i0 j8 x - printf("DMA Half transfer complete\r\n");
% }; G: H1 \; g7 z - }9 J& g4 X+ v2 y
9 O# U/ {' v6 S3 `- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)) [3 [* F) o; k5 C7 r
- {$ d' C5 K; `: [
- printf("DMA transfer error\r\n");* c" G4 j3 U& n6 u2 O3 o+ G) d0 c
- }
复制代码 : {8 c5 R( I, R
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。6 ?4 S: s1 u$ C
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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。
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3 j0 v- i5 C' [+ A4 s6 U所以最终是直接重写三个函数就行了,不用再去设置。
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! @3 N( p, e, y7 w; [# D- `4 omain函数中也不需要去调用,直接打印数据就可以了。 G- g% N4 w7 D) w! A! X' H5 t- {
( G9 N2 a9 x5 r5 e- f- #include "sys.h"9 B- C. _3 q* s$ r* a& N" H, I: X
- #include "delay.h"
6 S/ {3 y3 f( g+ b7 ]# R5 f; [ - #include "usart.h"' A H/ Q% s2 x: F" ^
5 M+ ]& K7 t) R1 h8 T1 Y- #include "adc.h"
- l) `% b" ]! ]0 U
0 @1 j' {) t: G& v; z" {- extern ADC_HandleTypeDef ADC1_Handler;//ADC句柄8 p) x( o) T- v! \) c
- extern uint16_t buffer[128];9 T' b( h& q4 `( b" X5 e
' M& ~' z- r& h5 @; E- void show() P4 p. K. w- \
- {; z$ h+ c! W: \: X
- int i;# T% m: E/ l# i& @
- printf("\r\ndata:");5 P' H; ~# T; [6 x/ m( S
- for (i = 0; i < 128; i++)
8 i% r* _9 O. Z: B* k - {) @( f, Q2 X) q6 D) V3 ]6 ~
- if (i % 16 == 0) printf("\r\n");0 |; T- ~( `; Z _/ N6 K( l0 x2 `2 `+ E
- printf("%6d", buffer<i>);' p$ N- G) ^+ W3 c' R
! l% L! W: p0 f7 x9 U- </i> }
/ g' d! O$ v- Y/ K& o1 [ - printf("\r\n");/ p. G8 b* c0 a0 R4 p
- }6 W- r3 K! ^' ^3 O' A& \
- # g3 @: @( W( ~9 \& L7 g6 S
! P( Y7 I% {! f% X6 e$ X- D- int main(void)& j: r! u9 r4 Q/ ?) n$ P- F
- {
$ t2 A3 q9 J6 @) l: Y2 | - Cache_Enable(); //打开L1-Cache' [5 b; V# Y& x: {4 O5 F
- HAL_Init(); //初始化HAL库1 ~3 ^6 v2 ^ x9 w
- Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
J! @* m1 t W1 c; z% f - delay_init(216); //延时初始化6 w- \' T; r2 ?5 Y6 X
- uart_init(115200); //串口初始化; Q) t4 ^; ?" C, ?7 r$ ?0 D/ ~ s' G
( b \* _4 V2 y1 q) v& b* c7 D- printf("start\r\n");
3 ~4 T+ d5 e6 `0 x - MY_ADC_Init(); //初始化ADC1通道5
: G: m+ h( b4 y2 w! }
! q. m+ O+ i! F) t& b* D& R1 Z2 R1 s- while (1)
; G- h V+ @9 O5 p7 X, o- N - {9 O$ A2 C( }1 e0 A3 e$ ~& ~
- show();8 J5 x3 C+ y+ Q. Y& \# \
- delay_ms(1000);/ @8 [$ D$ D# J# _9 l0 m% v
- }
- X7 W1 y- Y& T* s6 ] - }
复制代码 6 c6 V3 t8 F+ j* }& D" o% i
实际打印结果如图:9 h4 \4 s2 [0 m
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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:2 S8 x) x/ ^+ F9 L* k0 c
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: _: `) n" F1 m& |/ }) m/ T生成完代码后,启动函数长度修改位转换长度:" _9 t( Y; e# F; D
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- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 2);
复制代码
2 W; K; p' P+ m修改后的ADC完整代码如下:
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- j# e( i7 |- m* D% i- T- #include "adc.h"
2 N" O+ M1 e, Y% W' H5 m, g* J - #include "delay.h"6 ~- \0 A5 e( | l( I5 i: u
- : r0 O, A' a" D. ?
- ADC_HandleTypeDef ADC1_Handler;//ADC句柄
! W1 ?. l& h d5 l1 y' O - DMA_HandleTypeDef ADC1DMA_Handler;" f6 p$ }, [+ n) d, s" g
- ADC_ChannelConfTypeDef ADC1_ChanConf;
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& H; i' d5 J5 d( g- uint16_t buffer[128];6 a/ P- @ C& Z7 `. k& ]( f7 l! V
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- 8 R' `) s p( y. P
- //初始化ADC
/ h, Z) t: c+ U - //ch: ADC_channels
, l- q) Q# L8 h# q - //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
5 p% B8 I4 F$ {0 k+ W - void MY_ADC_Init(void)
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- __HAL_RCC_DMA2_CLK_ENABLE();
7 @4 w6 w" f' S! D) E# R - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
1 a7 {* x( J4 K8 _) o% M% y - HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
# [ D, Z+ U; k( m: A - # W0 S! J! {3 F, b, q4 ]
- ADC1DMA_Handler.Instance = DMA2_Stream0;
2 M% k! u9 G. l - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;
7 v, c8 v+ W3 ^ Z1 |* a, I+ { - ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;, q" J# |: \! k% H' L2 t
- ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
8 [ R6 p3 C- g {" d r: k - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式2 n! e# Y B5 A1 O& X% I* H2 X: i
- ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位
5 N- k" S6 m9 w5 F4 p% s! w1 ^ - ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位
, L" c F5 @: e# U. s - ADC1DMA_Handler.Init.Mode = DMA_NORMAL; //传输一次就结束) M* x9 T t, w3 [
- ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级' h& }! h, U9 c2 A# \9 H
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/0 X) t8 V8 \6 |0 R
/ `, Y- d- ~) K" C& f( y2 z- HAL_DMA_Init(&ADC1DMA_Handler);) |2 u! K( p* f2 P: I1 n
- , _' C. i- F" G
- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
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6 n& n! M' f8 y5 k1 q& G1 h; D- ADC1_Handler.Instance = ADC1;
) N2 F# ]6 D" {1 @ - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ9 @9 u5 B p4 D
- ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式7 b% }, f, _- h& |7 s" l& l
- ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式3 J8 p5 ~9 T: ^) N E
- ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换' M* R7 q, }% ` [/ g8 d
- ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式
& _& q' P% G) ~, Y# D - ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用软件触发4 V/ n& {) r, D! F0 r% D
- ADC1_Handler.Init.ExternalTrigConv = ADC_SOFTWARE_START; //软件触发: _: ~. J9 n# b j: |$ h8 L2 Q9 [
- ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
# X+ f" |7 x: l8 G' f @ - 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 ^5 g* M' l; W' Z. n) E
- ADC1_Handler.Init.DMAContinuousRequests = DISABLE; //关闭DMA请求6 `9 i( U, u1 i. j A
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV; ( D: m! p2 Q, M( b; Q9 B
- HAL_ADC_Init(&ADC1_Handler);
3 {9 Z. U+ G9 ?# a4 {! Q0 t - ( L0 P, F* g; Y3 G1 k
- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
9 x w3 j, ~2 ~3 Y3 u - ADC1_ChanConf.Rank = 1; //序列14 Q: e5 S# X* e _& j5 V
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
* S/ d+ K; o( }; z' g - ADC1_ChanConf.Offset = 0;& W( w* t+ r* z$ {
- HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置
! ^% L0 ?) F0 A y0 b H6 _# i
* Q# @- k" f1 H" ?- f- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道8 v& N0 i' y8 u& ^" Z) }
- ADC1_ChanConf.Rank = 2; //序列26 R1 l% T1 ?4 b' A/ o; G( J# a
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间, b& J& D# E# h/ `* q
- ADC1_ChanConf.Offset = 0;
/ b- s1 r: ^) n7 G0 H% w+ ^ - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置' W# b/ m9 K! y+ i; K
- $ ^5 P% `+ x$ b1 i5 N/ X" p0 g
- HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 2);- ^& ^- H# ?$ Y0 Z0 r/ Q0 ?
- / J) z( J; v- x: T6 {6 ~4 ]
- }: p; S2 A2 ^4 X1 s0 s1 e
. _6 \/ l& K ?0 h" U4 x% o$ O- //ADC底层驱动,引脚配置,时钟使能
0 s* b d& \$ ]6 Y. _ - //此函数会被HAL_ADC_Init()调用/ L4 t2 N0 a. u' [8 V) Q. O: d% O$ |
- //hadc:ADC句柄 z& J3 n1 _# i8 @7 Z6 `. R
- void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc), A) B$ Q, w% u7 V: Z) Q
- {
) e8 n7 r& }3 h4 ~# k& ? - GPIO_InitTypeDef GPIO_Initure;
5 [1 Y) ~: q7 z0 Q - __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟
3 m: a- F4 x: _: K# P - __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟
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$ j1 K5 `0 N6 t$ F- GPIO_Initure.Pin = GPIO_PIN_5|GPIO_PIN_6; //PA5' l2 u$ x. Y, J+ G# k9 `' |
- GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟+ z( Z h# f$ z3 g$ E& y
- GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉
. R) U3 Y/ S; f+ {0 s* X# j; l- B* X - HAL_GPIO_Init(GPIOA, &GPIO_Initure);
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; E, X+ a+ Y+ S1 @# g; ~3 m- void DMA2_Stream0_IRQHandler(void)
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6 V/ b, M; V# D9 y) w* t: X - HAL_DMA_IRQHandler(&ADC1DMA_Handler);
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- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)0 d. [6 L. c( n2 }: H: J; U$ v
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) B. k' T5 M; Q% c5 j - printf("DMA transfer complete\r\n");& b2 s# ^7 j2 Q, T4 j+ f4 ?
- }
0 \ ]( \0 r4 c/ {0 x - void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA Half transfer complete\r\n");# r. Z, I) i& ^; I$ a
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* r0 g, ~8 S' a7 i$ e* f- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
+ v8 O Q9 H: a$ H5 J - {
. f# }) J- d4 p! E3 W8 M- U8 G% } - printf("DMA transfer error\r\n");
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复制代码
- x9 I% b" I" x X, p9 D: _效果如图:9 c; _ w8 d, y0 r; w1 J( ?+ @ |4 g
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