实现了定时器加DMA的等周期采集。3 p% m8 d% K3 I
adc.c:
# l0 o3 k @7 w2 K, s4 U- #include "adc.h"$ e4 L* V) L' c1 w6 o
- #include "delay.h"
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4 H1 V0 e7 B2 V+ x4 J% z/ K- ADC_HandleTypeDef ADC1_Handler;//ADC句柄* u3 n& `' E5 \5 `
- DMA_HandleTypeDef ADC1DMA_Handler;* E! l* [ Y% D
- ADC_ChannelConfTypeDef ADC1_ChanConf;
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- TIM_HandleTypeDef TIM2_Handler;& |0 U ^+ ]9 ]+ |5 _5 p N
- TIM_OC_InitTypeDef TIM2_CH2Handler;) |- u2 w/ `* F* }8 L3 j) S
- uint16_t buffer[128];
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2 W( u8 x* l0 D' Q2 }( A* C: K- static void MX_TIM2_Init(void)
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. B7 F6 g. D9 E1 J0 K% x2 c - __HAL_RCC_TIM2_CLK_ENABLE();
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3 I8 ]9 {' i+ R) J" M" N - HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
2 U5 y( i1 r! D/ f* U - HAL_NVIC_EnableIRQ(TIM2_IRQn);6 s8 g6 ]: B8 R' P/ {' k
1 } H+ }9 a/ T! Y) U- TIM2_Handler.Instance = TIM2;4 g" Q8 F7 c8 k: |4 t' u$ C& n
- TIM2_Handler.Init.Prescaler = 10800;
1 h* ^: D' h" ^+ M3 L - TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;; I H g b8 j% ~( L
- TIM2_Handler.Init.Period = 20000;
) e' M; M# i8 f: H7 {6 h7 b. f) x - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;% w8 s1 Z, a; W, a+ g
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- HAL_TIM_PWM_Init(&TIM2_Handler);
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$ M& f0 w& ]1 L- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;# s7 m0 ?$ ` V( ^7 u; F
- TIM2_CH2Handler.Pulse = 10000;, _/ m' d2 B4 Z2 E* R; U
- TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
# Z+ @( Y6 y0 t - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;
& C% Q) v/ l' j - HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
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- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);
. Z8 M9 y9 l# [# l+ o0 T! g& a4 r - TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);0 d6 o" L3 h& k
- __HAL_TIM_ENABLE(&TIM2_Handler);9 L& E9 j- ]- x6 ?8 V
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2 N# \5 U& d% x9 P- void TIM2_IRQHandler(void)
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5 l: X6 g- Z5 ?; g; j* H - HAL_TIM_IRQHandler(&TIM2_Handler);7 s& B7 w7 ^: V; C
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! F) `, M- S+ ]8 W- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)- }) l/ r# |6 x; N; [
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& `3 ]* l, Z3 c1 F4 A - if (htim == (&TIM2_Handler))- u2 w+ V1 p( x8 g
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- printf("timer irq\r\n");
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- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)8 [9 j2 T. [0 P+ K6 K; ?6 K
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- GPIO_InitTypeDef GPIO_InitStruct = {0};
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! ?3 f& \3 d! ]# b- w- __HAL_RCC_TIM2_CLK_ENABLE();
+ [3 i$ E- N+ K# y& w - __HAL_RCC_GPIOA_CLK_ENABLE();! ?* z: d2 f5 n( {, u+ j
- GPIO_InitStruct.Pin = GPIO_PIN_1;
: L( v- `3 J; V - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
( \9 c& h4 g6 P L a' W1 x q - GPIO_InitStruct.Pull = GPIO_NOPULL;
7 C( x) l! m: { - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;* G9 ^4 {& {7 {& J& J& T( B
- GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;9 S) z+ Q5 d) H2 H; v3 B% z
- HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);+ I( V+ D7 V. U( Q
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5 Y5 Q2 n1 M# u( Z8 A3 {- //初始化ADC
( d1 y$ E+ x( w" K r- R - //ch: ADC_channels5 j# [* E! I) W
- //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
# x! w6 W6 y! i& P/ Y( } - void MY_ADC_Init(void)
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- __HAL_RCC_DMA2_CLK_ENABLE();5 { R1 A' s+ F$ p/ @5 ^
- HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);/ \2 Q. Z# Z3 Z' ?. M% u$ b
- HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
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- ADC1DMA_Handler.Instance = DMA2_Stream0;
, ]) W1 G4 E& W) z - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;9 j2 Q. U# Y- ]/ H
- ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;
- F# d$ C' l. L1 i6 g4 p3 H - ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
# H& G A" T' g1 \ - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式5 a+ o' c# A2 f; c# q3 ^
- ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位
; Y# q8 {7 h0 J+ j - ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位 ]( d5 e8 Y# n# t* K- t7 _1 N8 M3 y
- ADC1DMA_Handler.Init.Mode = DMA_CIRCULAR; //传输一次就结束
$ Q) U, T3 r4 R, ~& |" U1 ` - ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级* ]9 M" O8 W% l: |
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/5 Q3 ?+ g! D0 J! O
! ^& j1 G* v9 k- HAL_DMA_Init(&ADC1DMA_Handler);: J* T7 D8 v9 G" ]
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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;
( }, q; c. {4 r3 K* T - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ
_) }0 ]8 w! u6 P9 H3 ~ - ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式; o3 @; [: `. o6 s. [6 ~. |+ H
- ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式6 b! _: Y4 Z' d5 n6 z9 ~
- ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换
- O; `5 a. P7 H - ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式! N+ |6 V4 a; g
- ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //使用软件触发
8 V& _+ L! f; x- d. m" |, d" w* c - ADC1_Handler.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //软件触发2 T$ g+ C3 B9 q4 C0 @1 B0 R4 a
- ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
; v7 [" _7 L0 n. A8 R% G - 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$ H c6 T2 K% y9 h! ^" ?
- ADC1_Handler.Init.DMAContinuousRequests = ENABLE; //关闭DMA请求, d" ?/ ]3 y9 @# v6 Y
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
) J8 R- P# [. x# N$ x - HAL_ADC_Init(&ADC1_Handler);% ~2 c2 r6 Y) {- [4 S6 Q
- {( o! F9 P3 t: L- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道! w+ b1 g( u. A( }$ r2 |6 {
- ADC1_ChanConf.Rank = 1; //序列14 b* k: w( K' q9 m" R& S5 H
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
7 d. m( E: d% f6 d$ E) q - ADC1_ChanConf.Offset = 0;
1 N8 T; {6 N5 p( v& N5 A7 Z - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置8 S( `, V3 X) F8 B
z O3 U5 I$ V' E) |- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道2 b+ j2 ^7 @, Y8 S! g& x
- ADC1_ChanConf.Rank = 2; //序列2
4 r% R# t0 r& z* x, v3 O) G - ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
( j1 U/ E& i% _$ O" I# A - ADC1_ChanConf.Offset = 0;
8 ?7 a1 ^1 t, { M8 o - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置% X/ ?* N' {- i6 D, W8 d
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- MX_TIM2_Init();
|2 n4 }+ ]4 n1 ? - HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 128);
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- //ADC底层驱动,引脚配置,时钟使能
& w4 S( i5 v% o/ U - //此函数会被HAL_ADC_Init()调用
5 a; y. S3 t9 X1 O. r, q - //hadc:ADC句柄
6 s2 a# r8 e) S5 J2 L - void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)+ w2 K2 M1 _9 K( i, U
- {
$ k9 ~. o' T; P" I* X - GPIO_InitTypeDef GPIO_Initure;
: t: `( E' f ]+ e2 V! D' f4 }3 i0 {* R - __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟8 U' w7 a4 u- Z7 B2 L/ t& A$ j
- __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟
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V: u% z1 L3 I% e* Z9 U( ?- GPIO_Initure.Pin = GPIO_PIN_5 | GPIO_PIN_6; //PA5
* q4 H+ H. O/ ^ - GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟
1 u7 x2 `0 R% u0 u' m - GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉
3 I% W+ Q7 f3 Y1 O4 |) w. C - HAL_GPIO_Init(GPIOA, &GPIO_Initure);) l, Z" N4 @: G# \' y
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+ S2 E( v' k# }0 E* C- void DMA2_Stream0_IRQHandler(void)
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- HAL_DMA_IRQHandler(&ADC1DMA_Handler);
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- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)! ~( o; E/ e1 J8 Z; n! W3 c1 X
- {
6 u( _2 s$ L8 D& |! Q - printf("DMA transfer complete\r\n");
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" P- X* ?! e" M. C/ b - void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)$ ~* A, j0 a& l1 X4 N8 |* P
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- printf("DMA Half transfer complete\r\n");
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( C' a( P4 [7 W, l- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
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, [9 |0 C: n/ [8 C' h- A9 P - printf("DMA transfer error\r\n");
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复制代码
& p# `! M; C: _% k/ s# `main.c:
) k+ ]+ ?3 r1 x6 X, [- #include "sys.h"
( ]2 m4 r9 z, A1 z - #include "delay.h"
; R) p! D% {8 q9 L2 Y: {; H- l! y - #include "usart.h"
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- ^: E5 d; h0 q, ]7 C; ?' o- #include "adc.h"( Y P0 j+ _: |; ?- o
* }1 B6 O: q4 \ j- L( `* H2 S2 p$ t- extern uint16_t buffer[128];. R% x- l0 l( ?
] c' T9 C/ {, z! l# p- void show(); R3 i" ?- u$ O% N# _) O& S" z1 }
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- int i;
9 {# j0 N1 o3 I+ Z - printf("\r\ndata:");
( w1 R1 r+ Q9 W0 }; B6 C- Q/ q - for (i = 0; i < 128; i++)
{2 ?/ Z& Z: T* ?8 ~ - {
9 @7 @0 K9 J, g& G - if (i % 16 == 0) printf("\r\n");
& H( G# H/ h) ^! _3 ?+ r - printf("%6d", buffer[i]);! o- ] c% w/ [( ?9 J
- //buffer[i]=0;5 N; i3 r2 Q' j/ t
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- printf("\r\n");. U/ s) H1 a" y* E( ]9 J2 q
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: |; R5 h6 s6 I f- m- int main(void)7 C2 N* U$ d0 R4 [5 I7 u
- {
, M4 S/ _1 [4 k+ R - //Cache_Enable(); //打开L1-Cache0 p0 G0 T* P" x N' @! J' W
- HAL_Init(); //初始化HAL库! B/ `+ d% r: [' H1 K* p
- Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
" M: x0 ?. t/ V& J$ G0 [- G$ Q - delay_init(216); //延时初始化
# w1 t5 s @* b - uart_init(115200); //串口初始化% ]; i+ n6 D8 P& Q1 u1 K" \
+ E2 R; b; h3 B0 t- printf("\r\n\r\n\r\n---------------------------------------\r\nstart\r\n");/ h2 T$ S+ c: x- q5 ?9 N' z
- MY_ADC_Init(); //初始化ADC1通道5
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$ Y: U: N! J0 ^7 x0 f) ?; b - while (1)
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- show();% p2 N ^1 _( B |$ q
- //printf("cnt:%d\r\n",TIM2->CNT);! Y+ l% U8 j+ B, ?8 W; u
- delay_ms(1000);
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复制代码 9 O- e, e* c, H+ H+ u2 y* T. M* b
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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