实现了定时器加DMA的等周期采集。
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3 U" ~" g* f# w- #include "adc.h"
6 @+ D f% h% S3 ~ - #include "delay.h"/ Y$ L* Z0 ^; \$ o3 x/ T
# Z* ^; }6 W+ s5 `- ADC_HandleTypeDef ADC1_Handler;//ADC句柄4 U8 ~7 z$ m0 {( Z7 Z
- DMA_HandleTypeDef ADC1DMA_Handler;- Z) a+ M% d2 _! j. e
- ADC_ChannelConfTypeDef ADC1_ChanConf;; |6 p7 I- W* o6 t$ t
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- TIM_HandleTypeDef TIM2_Handler;
+ {# m8 g1 A0 a/ V- ~ q - TIM_OC_InitTypeDef TIM2_CH2Handler;( r; T4 b4 k! N$ r: E
- uint16_t buffer[128];
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- static void MX_TIM2_Init(void)- c" k! l) A4 A/ C
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- __HAL_RCC_TIM2_CLK_ENABLE();
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! a9 j* g5 `4 a/ p( S! t - HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);9 Q- r/ `( ]4 W3 T# s. r
- HAL_NVIC_EnableIRQ(TIM2_IRQn);6 P& M9 D7 c$ A+ O5 C
Z. J) ^* T* e. b# A3 s- TIM2_Handler.Instance = TIM2;
! V! S X* V. h# | - TIM2_Handler.Init.Prescaler = 10800;
& d7 _. z, p; a9 ?# p7 _- P - TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;
. D5 q: Y3 p4 G& B - TIM2_Handler.Init.Period = 20000;
4 P" m# K( Q, I, P, D - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;$ v' L; a( ]4 `" g) @- f
4 ^" r3 R' C/ R4 X! o$ u- HAL_TIM_PWM_Init(&TIM2_Handler);
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- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
- B5 a& ?8 d4 E" {6 ] - TIM2_CH2Handler.Pulse = 10000;
, ^1 L, S1 L% {2 S5 f5 j9 P! | - TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
$ o/ t/ {- g# C1 m. f - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;- G% n7 L& D& k: n
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
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- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);
, n& Z) z5 m6 e5 c - TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
, l- k; d6 c, L) C$ W8 a - __HAL_TIM_ENABLE(&TIM2_Handler);
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: {4 u% w! B7 O. N' o" ?% \- void TIM2_IRQHandler(void)( F$ K; D5 Y! q3 w
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- HAL_TIM_IRQHandler(&TIM2_Handler); C; v# j; u) G1 y
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- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
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, i/ r0 P6 o5 b# ?1 @ - if (htim == (&TIM2_Handler))
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- printf("timer irq\r\n");
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' c, X9 B( n1 p9 X% J) }/ _- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim), M! r. M! k4 ]. W
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- GPIO_InitTypeDef GPIO_InitStruct = {0};
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& d4 {! Z6 a: Q8 d4 |. y- __HAL_RCC_TIM2_CLK_ENABLE();
; b l b! K! S, }3 c - __HAL_RCC_GPIOA_CLK_ENABLE();5 Q2 a( t& C4 ?
- GPIO_InitStruct.Pin = GPIO_PIN_1;3 B) [' d5 k6 N# R/ d3 L
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;# n& |* t+ P7 W( n. h7 j
- GPIO_InitStruct.Pull = GPIO_NOPULL;
8 p5 E4 |# b; @" k - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;( P: [" p" B& ]- m. l, o6 c% L
- GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
# g' k( r( M. E x7 C. [% ? - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);0 D4 q! u: k# F8 ~1 L, t
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/ N. ]7 `4 X) ^5 O) o s- //初始化ADC$ M$ J4 B3 z, K/ Z
- //ch: ADC_channels u4 [1 e/ W2 O+ ^# v: ]2 x- m
- //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
* Y' j, W% x! t. x9 t' X+ @3 K! ] - void MY_ADC_Init(void)5 j i* u" B7 u' d; Q3 b
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- __HAL_RCC_DMA2_CLK_ENABLE();
: q s; {& E7 m& K; q- W - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);$ i) _ f& B- b% i$ o; `
- HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
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- ADC1DMA_Handler.Instance = DMA2_Stream0;
" t# G* W( t+ J, t. u" w. m7 q - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;" Z0 ~: Y" Q R; v- t
- ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;! i! _5 S% Z( N4 V; A
- ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
, a7 R6 z3 z, o$ v7 u - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式& N. j: E: M1 P
- ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位
+ [* u) X3 S7 `6 d4 `2 _+ ^4 P6 B - ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位
$ G1 h/ O& \1 z9 f( X+ F3 z: O - ADC1DMA_Handler.Init.Mode = DMA_CIRCULAR; //传输一次就结束8 V6 x) p+ d& [( v
- ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级* o( Q; D+ J) ^1 m; _4 F: e+ \
- ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/9 P# i: @3 U/ m- ]5 f
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- HAL_DMA_Init(&ADC1DMA_Handler);5 d/ c& g/ L$ X* _1 J$ Z+ m0 v
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- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
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) f) D+ R) k' ?$ `- ADC1_Handler.Instance = ADC1;
' A+ V" v8 _8 ^- b2 d - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ6 ~1 [/ Z. ^. C9 Y- x
- ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
% y8 ^# g8 V# f, b# \4 E - ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式 v! Q" F8 \* ?: r& T- H
- ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换; X( h8 p# T. d) D( F: z
- ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式7 |* L9 A2 S$ h- x4 G
- ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //使用软件触发
' q7 o/ X# d# u9 e, ~ - ADC1_Handler.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //软件触发( }( b6 F2 c+ z3 \% g
- ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
7 \6 d4 j! `( g5 M3 p1 X* ] - 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10 Y4 N2 O' d! o2 O& A1 z6 C9 S
- ADC1_Handler.Init.DMAContinuousRequests = ENABLE; //关闭DMA请求5 C8 d3 a) m- K: t
- ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;4 Y1 r" Y1 h+ n. {/ i
- HAL_ADC_Init(&ADC1_Handler);
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- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
. d5 v9 k: i1 y - ADC1_ChanConf.Rank = 1; //序列1
8 X) K; d! W7 b0 O$ d - ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
, r; O/ p- f5 l - ADC1_ChanConf.Offset = 0;
2 L. e% j, N" t) |; a; ~' X - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置4 d& p1 ?! x9 _# F; W$ V) m q
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- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道$ ^. v! b/ A* F. U/ m/ A8 o
- ADC1_ChanConf.Rank = 2; //序列2
) Y* {6 X" l$ S' q9 _. [. U - ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间5 f+ | J) M) w y1 S- p4 V
- ADC1_ChanConf.Offset = 0;
) b. x. z9 E( j9 ?1 h* L- I - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置
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) O3 ^* @1 j L" L - MX_TIM2_Init();* v9 Z3 l) b3 _" D( U9 M" y
- 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
9 {3 [ U1 M3 d- I1 R+ W - //此函数会被HAL_ADC_Init()调用( B7 s/ k( v- v, Q, \ s& M9 r
- //hadc:ADC句柄
- U& ?4 \% e K* f - void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)- H T9 P/ b1 {
- {
( r1 V" }! f! R/ J - GPIO_InitTypeDef GPIO_Initure;1 L( C4 A2 P) x6 K
- __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟% ?+ s- H( [. I0 E m! s
- __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟! Y8 Y5 {; u( f( x4 p, c
; P0 N: B# ?) I- GPIO_Initure.Pin = GPIO_PIN_5 | GPIO_PIN_6; //PA5
6 o" y" }; O2 F9 X - GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟
* S z4 j& J* H+ U* L% Y# x9 h - GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉. I9 h( z" }% A* G. S! A
- HAL_GPIO_Init(GPIOA, &GPIO_Initure);
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+ L Y( N6 j! ~! }) Z) t- void DMA2_Stream0_IRQHandler(void)% {5 y y$ v% v
- {
6 M% A |) g) R- Y4 k1 e) y - HAL_DMA_IRQHandler(&ADC1DMA_Handler);. _- d% {! r( z" t
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- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) ]5 t! [8 k7 F# ?5 M+ @3 W4 ]
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- printf("DMA transfer complete\r\n");
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- void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA Half transfer complete\r\n");
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- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)0 ?$ ]2 {+ Q; f8 E: O+ O/ c# V4 w
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- printf("DMA transfer error\r\n");
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复制代码 : n. x, f8 w7 M- b0 l) k. q! `+ v1 ?
main.c:6 q. s0 U F3 y2 {& `' A7 f
- #include "sys.h"3 y( ~# _6 Y( t& B; ~$ C, b' }
- #include "delay.h"
: n) @; a8 h5 i, N - #include "usart.h"
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5 m( t. U/ k4 W. w2 H& a/ V: }- #include "adc.h"; \' S. Z6 \; M
. k0 G* a3 I- Z- extern uint16_t buffer[128];
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- void show(), r! B0 u. o) d; Y/ j, p8 I2 T
- {# ~$ h! X7 R u' I l
- int i;3 a+ [; u! x5 x5 {. U' q
- printf("\r\ndata:");
) v1 l% D/ b* v9 F - for (i = 0; i < 128; i++)4 B; e8 ~. _$ M
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- if (i % 16 == 0) printf("\r\n");
6 l# ?, Z% t+ Z3 ] - printf("%6d", buffer[i]);
! d8 q( K# @0 P1 a) l - //buffer[i]=0;
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U2 H3 `1 F6 U0 I1 J' I - printf("\r\n");. B. c8 X$ I: b; t0 J1 T' L0 ^7 a
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3 o: o1 C3 {" k9 [- int main(void)
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" i: S1 A" j3 r4 i+ h) L - //Cache_Enable(); //打开L1-Cache. u1 k2 {1 N# f. ]! A' X
- HAL_Init(); //初始化HAL库
* L+ @+ r4 i4 n7 w9 T - Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
* U; W6 T2 T* q# v+ {1 r - delay_init(216); //延时初始化* e! V$ }8 X2 [4 J
- uart_init(115200); //串口初始化
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2 @& H+ q) g: |6 t9 X: x8 b- |- printf("\r\n\r\n\r\n---------------------------------------\r\nstart\r\n");" N- f" T( p5 d z
- MY_ADC_Init(); //初始化ADC1通道5
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; M8 |( L- O0 H3 N! H - while (1)! Q+ V) O, R6 y5 R, M6 A. G6 _
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- show();: \6 ?! ~, P* P8 |" }3 w
- //printf("cnt:%d\r\n",TIM2->CNT);3 `- t* I, {( M# ~7 y
- delay_ms(1000); Q2 x3 N0 R: m, R1 F; h9 F
- }
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复制代码 7 z3 ]" m- L! r/ v% M) Z; H$ Q: D
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:0 I" Q( @ v, `8 M1 Z8 P
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