注意,在CubeMX中,void SystemClock_Config(void)多了如下代码:
* R4 O, q" W( E- RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};; V- f" k3 B0 U, \! G
- PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC|RCC_PERIPHCLK_CKPER;9 D. |- v! F$ Z+ x+ W3 V
- PeriphClkInitStruct.CkperClockSelection = RCC_CLKPSOURCE_HSE;
z% E4 e* l( @- G - PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_CLKP;2 ~3 H. G7 d$ J" y* E+ G5 J
- if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
( M2 x- {0 F$ {/ S - {' y) | c8 Z7 P6 ^7 E& n# ?
- Error_Handler();5 M9 s+ M1 v7 O. r/ z
- }) l6 {: i4 X- l D, \
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7 R, N- w/ \9 j4 H, r K查看HAL_RCCEx_PeriphCLKConfig函数中关于adc的部分:* q5 _. B$ P! w& g5 P4 e
- /*---------------------------- ADC configuration -------------------------------*/
+ {6 M, E& J8 `$ z& D - if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_ADC) == RCC_PERIPHCLK_ADC)2 x/ ?0 p' B& X) X- A5 l5 w) K
- {
2 B" R* a% b4 G: l - switch(PeriphClkInit->AdcClockSelection)
7 L* v7 l* D$ e2 R - {! X2 j6 e; ?; @0 i3 t4 h J5 j
' r) N+ f, a& l- case RCC_ADCCLKSOURCE_PLL2: /* PLL2 is used as clock source for ADC*/9 c/ {4 Y) i4 \6 H6 l( u: I3 H- Q
# V8 k* a2 G: z- B- ret = RCCEx_PLL2_Config(&(PeriphClkInit->PLL2),DIVIDER_P_UPDATE);5 t* }! k7 j8 u$ j K$ }: @" d
- - {* Q! e2 x' B3 D+ U
- /* ADC clock source configuration done later after clock selection check */8 {$ X* g( A; C& P2 a8 @9 t, O$ r
- break;
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2 c. z/ s9 }, U `- case RCC_ADCCLKSOURCE_PLL3: /* PLL3 is used as clock source for ADC*/% p0 _& C7 a- H. o6 W3 ?3 X
- ret = RCCEx_PLL3_Config(&(PeriphClkInit->PLL3),DIVIDER_R_UPDATE);
; P% Z9 A. M" P9 h5 x) K
7 O3 s% B8 v3 b7 R0 Y- /* ADC clock source configuration done later after clock selection check */) y& ]7 e {, {/ w' ?2 q. `
- break;& ~6 |2 W6 F3 q
- / ~, V6 t9 k2 ~/ Z
- case RCC_ADCCLKSOURCE_CLKP:5 H5 \2 }" ^' j. O9 R# M1 o
- /* HSI, HSE, or CSI oscillator is used as source of ADC clock */+ r) i, q: l+ a. I# u! O
- /* ADC clock source configuration done later after clock selection check */# A$ s5 {. {* S4 Z7 q
- break;, C' D0 F7 s& n
' j0 F" H0 `/ Q4 a6 \' B( E- default:
) \+ K9 D! U1 G; k! N1 p8 d. @8 W& L - ret = HAL_ERROR;
3 q8 _1 g% C7 b' N* s( f - break;+ a" s# q* E0 I, u3 I( N/ S
- }+ k; ?" T# ^0 k3 f" e
6 W% }# i4 w* q5 d& l1 ` u- if(ret == HAL_OK)
" W" Q3 O8 M) n# d, H' R# W6 ` - {
% q% h" ^" a/ h4 y( C - /* Set the source of ADC clock*/
# q, ^ }0 }: x4 \ - __HAL_RCC_ADC_CONFIG(PeriphClkInit->AdcClockSelection);3 o* B& k3 T+ A" d8 _
- }
) m$ \7 M( [* S: j- b0 v - else
' D8 b0 Z: [1 B2 `% b6 c - {
4 b# g) W5 E/ o# G - /* set overall return value */
: t) o' Q1 k" L' R* i$ H# I, \) d1 | - status = ret;# v( N1 {1 ?4 _1 {
- }6 D* V9 ^: m5 o' @0 F# Z
- }
9 @0 z9 O1 g2 S' C, T
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" Q+ G. e# e% ]% u# [& ^而实际上我们只需要在生成HAL_ADC_MspInit中添加一句核心的__HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_CLKP);//ADC外设时钟选择就可以了。
' V0 k% @" i- f1 y/ QADC的时钟源有三个选项:3 Y; L( P& ], I% {* p
- /** @defgroup RCCEx_ADC_Clock_Source RCCEx ADC Clock Source$ b+ D/ B) c6 Q% Q6 g8 u! q' v
- * @{4 V5 @- W8 }% k
- */7 Y( e0 l, }/ `! M! `2 [- U% q
- #define RCC_ADCCLKSOURCE_PLL2 ((uint32_t)0x00000000)
' k; n9 I+ z3 G - #define RCC_ADCCLKSOURCE_PLL3 RCC_D3CCIPR_ADCSEL_0% i/ B; E$ d1 k+ d8 L4 e( H% R
- #define RCC_ADCCLKSOURCE_CLKP RCC_D3CCIPR_ADCSEL_1: Z Z0 h$ F4 G) ?- L; c4 E2 |3 O
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默认将采用RCC_ADCCLKSOURCE_PLL2,即400M的输入时钟,时钟太快,所以会导致ADC采集出来的数据不会有变化。
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全部代码如下:
! p, y9 k# i) @; I8 s0 v8 T- #include "adc.h"
- a% d4 n) d9 v+ H1 y - #include "delay.h"
; ~/ b" s) N- b$ D3 Y2 @1 y - 5 M0 F& p2 G& w/ T7 G; D) `
- ADC_HandleTypeDef hadc1; \) g+ W D8 Y% ?/ z$ x8 P+ c
' W0 \* X0 s3 T- J; r4 v- static void Error_Handler(void)
& C9 ~5 Y* u# E. N4 I9 K - {1 ^5 H* p! q, e5 f) h
- /* USER CODE BEGIN Error_Handler_Debug */
- B, y/ @6 S# p2 J5 w - /* User can add his own implementation to report the HAL error return state */
# b4 G0 I) i) ^, @" c( i
# E z$ O$ L( d- U1 s: `' }, E- /* USER CODE END Error_Handler_Debug */
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- 9 }- Y% s, ] d1 L( p' k2 F/ b) S3 @
- //获得ADC值. t2 B( {# f6 W2 Q
- //ch: 通道值 0~16,取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16, m- C8 M5 {' i7 x# X' o
- //返回值:转换结果
% z2 U( N0 ]! S T- n9 { - u16 Get_Adc(u32 ch) / Y1 C2 |6 a& B3 c- C
- {# C- J0 k6 F0 w# H4 b, D$ W
- ADC_ChannelConfTypeDef ADC1_ChanConf;7 H6 g" {- Y, x/ U* ~/ {( k
-
, z; [2 e: _9 }8 I& j - ADC1_ChanConf.Channel=ch; //通道
/ T. e4 q% B# }1 W: w - ADC1_ChanConf.Rank=ADC_REGULAR_RANK_1; //1个序列: }8 Y& y, R8 ?6 y5 [2 O" _
- ADC1_ChanConf.SamplingTime=ADC_SAMPLETIME_64CYCLES_5; //采样时间
2 d) G+ X' \! L. u9 G Y: w) q - ADC1_ChanConf.SingleDiff=ADC_SINGLE_ENDED; //单边采集 1 Q) `6 r3 h' S- q4 I# l( @4 X
- ADC1_ChanConf.OffsetNumber=ADC_OFFSET_NONE; ! S, \! Q7 c# P
- ADC1_ChanConf.Offset=0; $ b! j1 {1 Q3 x& ]
- HAL_ADC_ConfigChannel(&hadc1,&ADC1_ChanConf); //通道配置$ M6 Q5 c! _& v* W% D) x% j
6 v6 A# ^; T; b6 i/ L- HAL_ADC_Start(&hadc1); //开启ADC: z! x ]# `9 w% d: Z
- & z5 }" T2 j/ e& `4 q( p( G+ M) [
- HAL_ADC_PollForConversion(&hadc1,10); //轮询转换) V# X# v3 \ S# z+ ^
- return (u16)HAL_ADC_GetValue(&hadc1); //返回最近一次ADC1规则组的转换结果
$ }$ ^7 @$ h4 [5 W0 U; s7 ^/ \ - }
8 Z3 ?2 a3 ^6 ^; k; u0 e
7 j( \6 f3 X) i7 M+ ^, o) m- //获取指定通道的转换值,取times次,然后平均
, C6 L: \* N+ `* M- [& u - //times:获取次数& g! r c7 b/ P9 Y! p: x
- //返回值:通道ch的times次转换结果平均值
$ @/ T; R3 ~1 Z' c - u16 Get_Adc_Average(u32 ch,u8 times)+ I# y6 i/ ?! c
- {/ `) \0 J* j9 \ Q$ z9 i9 q1 @7 q
- u32 temp_val=0;9 r- \9 d2 f6 F0 O5 O+ w
- u8 t;
1 t, Z: U# _/ v+ e8 B2 L - for(t=0;t<times;t++)4 s5 r+ T% z0 c9 N. I
- {4 O/ J; v) p6 X* {7 I
- temp_val+=Get_Adc(ch);9 A; P- @) l! o; k7 F7 i7 J0 Q
- delay_ms(5);
3 n1 N/ x0 z; t* t - }& I: `* G7 k6 @4 Q/ V1 A9 U
- return temp_val/times;
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3 t2 I& s: |3 D6 H# r/ E- ?2 f, t- ; j* _ Q4 n4 t& \. V: V8 h0 {
- /* ADC1 init function */
l* d5 s' K1 O# ]" }) k8 d0 a4 l' p - void MX_ADC1_Init(void). h# w n f( |$ V; \
- {
1 O% s' Y/ }% |( I; L/ n% K* l0 G - ADC_MultiModeTypeDef multimode = {0};
0 ]% Z# I/ I- A& T$ b - ADC_ChannelConfTypeDef sConfig = {0};
$ p3 p# ~$ x6 J; m! B* Z% Y3 k - % v8 m) B; _/ @, n# C
- /** Common config & e0 j: f E$ O6 P! Q# S. j3 q
- */4 w: |' t4 `0 L! S# S1 d. O
- hadc1.Instance = ADC1;
9 ]% \" P+ U$ k2 M - hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV12;
7 y8 j( v/ S: r' y0 O - hadc1.Init.Resolution = ADC_RESOLUTION_16B;
h% z" K* U+ [' @ - hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;* k4 f3 S% f3 r, c s
- hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;# s3 g* q5 g3 A) c
- hadc1.Init.LowPowerAutoWait = DISABLE;
) p8 b- E5 p& Z7 y7 R - hadc1.Init.ContinuousConvMode = DISABLE;8 c; }' D6 K8 U$ a6 F2 C& F0 l
- hadc1.Init.NbrOfConversion = 1;5 e# r' f! E9 h/ z, i
- hadc1.Init.DiscontinuousConvMode = DISABLE;
x: [: K# ?& b, u8 Y - hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
. n. P+ ?5 b! D/ Y( E7 T1 l - hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
/ `/ ^6 g5 S4 X% V6 o$ K1 W - hadc1.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DR;
3 J& |! [0 z" \+ Y+ `, s- o - hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;6 @2 \3 i5 r; l# c
- hadc1.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;7 |% `9 }4 l; s: e. }6 ^
- hadc1.Init.OversamplingMode = DISABLE;
5 P S R* `* r' o& _ - if (HAL_ADC_Init(&hadc1) != HAL_OK). `* M5 \ o4 _, R6 U' p5 c
- {! e. Z) L- x* E( d/ k2 _# Z
- Error_Handler();1 i7 X6 P; z% ]$ I5 y: `% H
- }
; K/ l* r3 _9 v) q1 s/ p; n% `: f - /** Configure the ADC multi-mode 9 a- E) P' e) {1 b
- */3 d, U i0 \! x! @* p k2 | h
- multimode.Mode = ADC_MODE_INDEPENDENT;: k5 i, d3 v6 t/ R
- if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
0 i/ B4 }& \! l7 s! a - {0 t1 o5 j1 F6 {% e
- Error_Handler();3 {3 M1 o/ V. O0 O3 T* ]/ z" W
- }6 n- w' U+ z; P$ o8 w# |4 E8 P4 {; G
- /** Configure Regular Channel
6 m9 Z) y3 V: u - */
5 M$ P% k' I$ S - sConfig.Channel = ADC_CHANNEL_19;3 P7 i6 D9 Z! x8 Z+ e; `7 ], ~
- sConfig.Rank = ADC_REGULAR_RANK_1;$ B7 h K' z' `7 _* Z/ N8 d
- sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;+ R$ x* E2 M0 {$ p3 u/ `6 b; U, c
- sConfig.SingleDiff = ADC_SINGLE_ENDED;
& V5 E6 Q+ j2 m& n4 ^! p5 t/ x) @5 I - sConfig.OffsetNumber = ADC_OFFSET_NONE;: q0 E+ R9 y8 {/ k: p, o b' ^
- sConfig.Offset = 0;
0 p) X6 L# V2 { b3 v" J2 {( n. _1 L - if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
% l) J6 p9 L6 f" B' D - {( K8 {8 ~- y' `( G
- Error_Handler();
& x3 Z0 E V% `$ \ - }
& t7 W2 k: X; m - % C& G6 F9 T& @
- }
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) {6 m, g: N/ P3 {- void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
5 d4 ]: N) \- s; G+ @$ ^* |1 z - {
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0 a8 Z( ~4 U2 {/ o2 Y; f6 A& }- L/ M- GPIO_InitTypeDef GPIO_InitStruct = {0};
- z' t& {1 u4 F" O - if(adcHandle->Instance==ADC1)
0 Q1 ^- S' D8 W$ b5 n B - {
' B3 Z; {, k. G+ i5 U, {- k; c1 ^ U6 ` - /* USER CODE BEGIN ADC1_MspInit 0 */
; L/ `8 u1 [8 W - 0 [3 g7 U9 q$ E3 o$ T8 P( e
- /* USER CODE END ADC1_MspInit 0 */
# O- n. j6 B& Y - /* ADC1 clock enable */
; v2 g% @+ C8 ]/ }; I - __HAL_RCC_ADC12_CLK_ENABLE();( q3 I; I, p( w4 C
-
0 U, A4 N: `0 }' s/ L8 }( }7 y - __HAL_RCC_GPIOA_CLK_ENABLE();( \: N9 d' k( w2 o+ E: R6 h; p3 j& J
-
! n1 D- d! {: u, z - __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_CLKP); //ADC外设时钟选择
' X% M7 e! o* M: v7 W% y - /**ADC1 GPIO Configuration
" O4 _3 d: k1 X9 n - PA5 ------> ADC1_INP19 & B i( g9 o8 |+ O2 C2 b: I
- */0 D# w* o1 Z3 R/ l* h/ G$ U
- GPIO_InitStruct.Pin = GPIO_PIN_5;8 e- j) Z5 Q6 O$ t: O h/ j
- GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
1 O& }9 {: D0 p3 @ - GPIO_InitStruct.Pull = GPIO_NOPULL;+ {( S: [0 \ L$ ~4 M$ E
- HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);) O0 {+ c& |6 R$ \6 z$ q2 m
( D- F( ]4 K) U- /* USER CODE BEGIN ADC1_MspInit 1 */
2 ?% i+ q/ @& N2 ]
1 S6 `& L0 e" u5 Z+ e# T- /* USER CODE END ADC1_MspInit 1 */, c, @9 r2 G' V+ A' G
- }8 ], |1 t& C; R3 O: N* r* t
- }
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; ~$ B" `" n0 Q9 P& N8 y3 G( e* K; J- void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
. A; |7 \* x- x - {% j9 L2 e0 F6 `9 ]! D: ~% t# Z* x
- ! h% T& a7 K6 H( o A! O
- if(adcHandle->Instance==ADC1)
" @% i' k; C! ]+ ]/ T! G - {
0 l. ]* n. d" ? d( t2 A - /* USER CODE BEGIN ADC1_MspDeInit 0 */* d9 v# }& |1 g, R/ p. |
- ; l( n! H7 S3 p$ w
- /* USER CODE END ADC1_MspDeInit 0 */
$ d, i! h+ p9 V8 L' _' @ - /* Peripheral clock disable */7 n$ \/ _; T6 q9 T4 K7 w
- __HAL_RCC_ADC12_CLK_DISABLE();8 I. j0 f% R8 {/ }% i* {: G2 P' E
-
2 @! F, F' b+ i8 r+ g& F - /**ADC1 GPIO Configuration
/ u2 k8 ?9 @8 D' N2 W$ O( W - PA5 ------> ADC1_INP19 " F' S" |6 j& D ]- b
- */4 ]+ L( N, t+ f; F& ]% \
- HAL_GPIO_DeInit(GPIOA, GPIO_PIN_5);
/ H" ]+ K8 S$ B6 I - - h6 i9 o6 q7 v. }% g+ S0 e2 f3 ^- {
- /* USER CODE BEGIN ADC1_MspDeInit 1 */
7 B! Y' v T5 h' ?6 ]6 V' R X; S7 f5 |& t
% R2 I7 G1 ]5 S- /* USER CODE END ADC1_MspDeInit 1 */
# L6 ~, U6 x7 z% o1 M4 \$ J1 { - }
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% X" c3 m4 g6 j: R7 N( S- /* USER CODE BEGIN 1 */; a* s' O" F7 `9 J: Q
- ) j3 \, a' i% ~- H: S6 O2 [
- /* USER CODE END 1 */
! @! x! z. N4 |# s+ E& X" E - 0 _8 s5 G% L6 R9 {. O, C0 g
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& d. F6 `8 z: c! o$ T! g/ {/ J. k主程序代码:
# s1 L7 o) ]6 T1 d7 ~- Q7 t- #include "sys.h"8 q3 f9 }% ~# ^+ V9 u
- #include "delay.h"
3 V# h# z6 ~' t; b" ?( {+ n5 ^0 w - #include "usart.h"
# t8 y. }# O# J9 ? - #include "adc.h"
: _) h$ J9 J/ l+ g - ( a, o& {" x( m$ \* z: s% f- ^
- int main(void)
6 W3 d. {7 A$ A' a" ` - {- h. c" [' z/ i2 M- X- t
- u16 adcx;
% [4 J n/ D% D: O1 X! [3 l - //Cache_Enable(); //打开L1-Cache8 J1 V0 L: \8 z g# o
- HAL_Init(); //初始化HAL库
2 Q+ [2 @3 e8 e1 ]7 r, ~ - Stm32_Clock_Init(200, 2, 2, 2); //设置时钟,400Mhz
; ^& g; m/ r+ [6 {* E - delay_init(400); //延时初始化
9 p. J( L$ k. j( ? - uart_init(115200); //串口初始化
9 r; q: v; X$ v. V6 F5 v4 W - printf("hello\r\n");) c1 l% B( E* Q$ [6 i
- MX_ADC1_Init();/ j1 V; M, }- }5 d' s5 {2 z4 r( P
- while (1)/ h$ p# ]6 |6 s
- {
, |4 A8 f1 v8 h6 t - adcx = Get_Adc_Average(ADC_CHANNEL_19, 20); //获取通道19的转换值,20次取平均4 ^ i- e0 Q- ]
- printf("adcx:%d\r\n",adcx);/ T5 Q- B6 F n/ U4 B# v$ m" `
- delay_ms(500);
% O% z4 U* k/ f: K2 L5 T, G2 d - }
- F! ]. N6 K' n! }6 I - }
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感谢分享,非常有用哇