实现了定时器加DMA的等周期采集。
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- #include "adc.h"
1 F, C; d0 @% S - #include "delay.h"" Y/ q. x6 ~: y
o( I$ T/ a! l% k- ADC_HandleTypeDef ADC1_Handler;//ADC句柄0 G7 e! ?0 [8 D$ j9 P
- DMA_HandleTypeDef ADC1DMA_Handler;
+ L- c# U ^- G8 K - ADC_ChannelConfTypeDef ADC1_ChanConf;" m: d0 `4 m$ P0 j* \# _
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- TIM_HandleTypeDef TIM2_Handler;
6 @: X, Q$ Z" |7 L% P - TIM_OC_InitTypeDef TIM2_CH2Handler;
2 g) E3 J$ J- E - uint16_t buffer[128];; W: ^4 g! Z3 \+ x2 Y; Q& P
! D- w$ U; y# y. I- static void MX_TIM2_Init(void)
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j/ l2 j( V) M - __HAL_RCC_TIM2_CLK_ENABLE();1 y; G% A2 C" s7 {3 h
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# Z; C5 _- G$ ~+ ~' k* g+ Z - HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);. `& M& v$ V7 ]8 I* D8 V) b
- HAL_NVIC_EnableIRQ(TIM2_IRQn);
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- TIM2_Handler.Instance = TIM2;9 J7 A% \7 ^) H$ F7 M
- TIM2_Handler.Init.Prescaler = 10800;$ J; n5 ~% c- N5 Y
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;. Z6 m3 I7 e# b6 c
- TIM2_Handler.Init.Period = 20000;
+ f! d! u3 I+ V% h: N. a/ w* J/ Q - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; m3 c- p! g2 }) Y
y: F6 Z9 b2 ~+ A/ @; ^. d- HAL_TIM_PWM_Init(&TIM2_Handler);
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- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;% |& ~3 s! V; L8 Y
- TIM2_CH2Handler.Pulse = 10000;
1 M- `4 a: A/ ~ - TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
* a; S- g3 s3 }, ` - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE; B' o6 X. r1 c3 S7 ~
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
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- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);
. X9 @- e: c Q3 w - TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);1 D: ?6 r$ |) V* [7 C$ X' }8 O
- __HAL_TIM_ENABLE(&TIM2_Handler);
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: S# ^' z7 s4 b& j4 N* y# i# }. i D- P- void TIM2_IRQHandler(void)% q: n( A# m, S9 F) O
- {
1 T1 u7 N7 N/ Y6 g6 K - HAL_TIM_IRQHandler(&TIM2_Handler);% U; |, y% \ H
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- # }% i+ w3 V7 L9 w0 k
6 |7 o4 [8 n5 K! j( x- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)2 i: [; Q* C: v0 }1 i, W6 L& E
- {
5 T5 x# ]- Y0 h- b - if (htim == (&TIM2_Handler))
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/ N1 U/ z" k0 p- A - printf("timer irq\r\n");
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- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)8 |9 u6 I5 a E- S% l8 D) |7 P
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+ k* V) N" M, s; m' S - GPIO_InitTypeDef GPIO_InitStruct = {0};
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- __HAL_RCC_TIM2_CLK_ENABLE();, {1 @9 a# G# |
- __HAL_RCC_GPIOA_CLK_ENABLE();$ {; k" H; a J, Y: d0 u0 w
- GPIO_InitStruct.Pin = GPIO_PIN_1;
7 ~+ _5 m8 |/ M- l - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
- L* [1 J1 `2 e9 u J' Y - GPIO_InitStruct.Pull = GPIO_NOPULL;
4 g! m9 K8 f9 | o" K' [8 S - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;. |) ~3 i3 o l2 g, A( Z& U- w
- GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
$ e2 e2 f o4 e - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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: D1 `" r' [0 _' @- //初始化ADC
% [( s: L( D2 b+ l% `8 c3 k - //ch: ADC_channels
/ w+ J. c; }- K - //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16% S( J9 s e7 v5 A# Q! Y7 {
- void MY_ADC_Init(void)( t+ Y- I8 Y. l8 R
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- __HAL_RCC_DMA2_CLK_ENABLE();
" k6 R- ~" z, u) Z5 P( J - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
% Y; i0 B8 K8 ^- @' H4 E g - HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
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- ADC1DMA_Handler.Instance = DMA2_Stream0;" D% G% M. \% p Z) i- H# I1 Z
- ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;
' M, j3 [: |: _ - ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;
* |8 T" c( F" x' d/ c - ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
" W7 d$ j0 r0 p# N( u% o - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式
, U$ C! {5 V5 s- H( V. c - ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位; ?9 Q. W, x+ l
- ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位7 ]" w/ m9 L6 {4 j \
- ADC1DMA_Handler.Init.Mode = DMA_CIRCULAR; //传输一次就结束6 K8 d- V) y2 a F0 b# P- `# b
- ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级" ?% N, u1 E' S6 [- b' V' W/ Y) }
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/
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- HAL_DMA_Init(&ADC1DMA_Handler);& {( [7 w( J _' D
/ r9 N5 S* x" v! r0 H& p- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
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- ADC1_Handler.Instance = ADC1;; W" u; \5 U1 D
- ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ$ i& D* o3 `. x% B* u" C1 Y+ N
- ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
7 t+ R3 v& {( q9 d9 J - ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式
$ H8 q, k* E4 u G9 U - ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换
6 Q+ s2 x( K" ?2 s" M - ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式) ~! T! W4 x3 \" d% [; P
- ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //使用软件触发' U3 E" ^3 s8 K# ~2 k' X
- ADC1_Handler.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //软件触发
' Q: v( V' s5 F2 C - ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐2 l- s: B: H) R2 ^, Z4 u4 k& _( S9 J
- 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1
# o ?/ _( B7 V! X3 M - ADC1_Handler.Init.DMAContinuousRequests = ENABLE; //关闭DMA请求: e+ r; E4 r' ? X- s: x
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;0 O; e+ I a. q, B+ V" `
- HAL_ADC_Init(&ADC1_Handler);
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: ~1 s; F, [- c0 J' d- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
- e, O( a9 ~% U4 u* H+ I - ADC1_ChanConf.Rank = 1; //序列1% e* k: ?. h9 H, @! U5 D
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间% m, c5 F$ O' k3 v1 v
- ADC1_ChanConf.Offset = 0;
! D: L/ k7 b# s' ^8 k( V; j - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置
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- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道
; S& i, l% z8 P- }" @. d) n - ADC1_ChanConf.Rank = 2; //序列21 N' O/ i, t" W( O+ D
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
6 _& \9 `& X( L% l# B( L4 s, Q - ADC1_ChanConf.Offset = 0;+ \4 G/ v- X& m% `4 d/ D8 c; B/ @7 U
- HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置3 ^8 h6 G! E4 y
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- MX_TIM2_Init();
3 U6 e ?# o4 A: `% P+ i - HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 128);
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% k3 G5 R9 [3 s3 V s( n# H- //ADC底层驱动,引脚配置,时钟使能$ V" L' o( J1 b* l- Z! s: N/ O
- //此函数会被HAL_ADC_Init()调用: n! C# O r$ w7 T: U8 @" `- Q9 S
- //hadc:ADC句柄
6 M, y- R$ d6 J* P3 B - void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)
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1 }. X# k8 H5 N% d$ P# | - GPIO_InitTypeDef GPIO_Initure;
" ~1 O- N+ Q! u- v - __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟
" U* k7 x$ } R- u a - __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟* p; J+ x* M0 q+ P% L4 ~
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- GPIO_Initure.Pin = GPIO_PIN_5 | GPIO_PIN_6; //PA5
) }, K: A3 w) i* x( F1 }$ U - GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟
# _' y5 R" ^+ _& K+ Y0 U- j - GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉# D# w! m( l- F7 l
- HAL_GPIO_Init(GPIOA, &GPIO_Initure);6 R) t8 B V" S" N) T
- }
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% L4 Y2 ?$ G2 F# T/ [' X% |$ Z6 q" c- void DMA2_Stream0_IRQHandler(void): T2 D$ `0 m6 r7 X: G: X1 O
- {
8 k$ a) w5 ?9 t! f - HAL_DMA_IRQHandler(&ADC1DMA_Handler);
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p4 |7 _; G H" s) b; f- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)& N" [4 b8 I& W8 C) x+ G9 {! S
- {
0 f1 N5 d( L: O# v! f - printf("DMA transfer complete\r\n");" Z' e R! N7 O2 \2 W2 K, m
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- void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)( Q4 c- ]! H0 S( {' @$ m6 B
- {
! d1 W" e# B: ]* ~; B6 M - printf("DMA Half transfer complete\r\n");
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+ ~5 j( U: D! I4 y$ p- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA transfer error\r\n");
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复制代码 . m( G4 G% C; p* O
main.c:+ Y& |' I8 X* O) X7 p6 i
- #include "sys.h"9 ^7 @' v6 {) I3 F; ?
- #include "delay.h"
. `8 d5 s6 y8 u/ z* N3 S - #include "usart.h"" t, b k; k7 A0 Y; |
- 3 k" ^4 a+ B5 x7 B6 i2 q# _0 z
- #include "adc.h"
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1 e! R/ {1 _' Z5 {; |" |1 U* x- extern uint16_t buffer[128];. W) _ }1 b( f" {' M5 U
. k" v- i) r5 d- void show()# Y! p1 c7 U4 {( e' K5 s9 ]
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- int i;
6 d" c1 X0 @" e8 L/ S6 Z - printf("\r\ndata:");
c9 i. g& r/ P7 K) }- f - for (i = 0; i < 128; i++)" q) q1 l4 J2 _- L8 F; u" a( h: e
- {
( w& c! C, }9 O: J4 U9 q - if (i % 16 == 0) printf("\r\n");
& c% Z% B6 M9 X% t2 Q% f- e) c - printf("%6d", buffer[i]);
: d: p; V; g5 ?" z; H - //buffer[i]=0;; N- b) K$ ?2 l, @3 \- i* ]% h! B
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* X! n/ O* g3 V' k. o3 w3 z - printf("\r\n");+ ]' ?" @7 s/ K B2 `
- }
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0 c# d' U ] G3 g, ^- int main(void)
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- //Cache_Enable(); //打开L1-Cache
2 c5 a7 E; W" X! Z! B/ P x8 _4 N2 R - HAL_Init(); //初始化HAL库0 n5 h* ?, M7 w' v8 E9 t
- Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
/ U5 U6 h/ ?2 t2 I - delay_init(216); //延时初始化
" P6 z6 o9 e/ E' o, }0 ^5 o* b5 t - uart_init(115200); //串口初始化
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- printf("\r\n\r\n\r\n---------------------------------------\r\nstart\r\n");0 w5 }* @# }) P6 t
- MY_ADC_Init(); //初始化ADC1通道5! ^) ^# N/ B( M. u$ W! v- a
- 7 l" Z8 i. B+ l* [. |: D6 S& u4 h
- while (1)5 K4 ?# y! `" U u: a4 f" m
- {- q& m4 }4 I& n4 u8 S( i, J& J
- show();, D9 D9 H. T4 e+ q d; |9 `8 K3 C: D
- //printf("cnt:%d\r\n",TIM2->CNT);6 d# a* C: L8 r$ l/ Y% d: [6 P
- delay_ms(1000);
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- }
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因为定时器是2s采集一次,主函数是1s打印一次,所以显示结果如下:
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