实现了定时器加DMA的等周期采集。) s& i# }) M! L) n' y W
adc.c:
+ ^+ \( m- R4 V0 ^, o- #include "adc.h"
# b: Q7 b6 L' K, ^ - #include "delay.h"( l! ]6 R' R, O3 w0 H( g' F$ e' V# a
' Z8 b+ A$ H0 e4 ~3 v- ADC_HandleTypeDef ADC1_Handler;//ADC句柄' {7 h Z7 X5 S6 ~" d, K* w
- DMA_HandleTypeDef ADC1DMA_Handler;$ p) Y$ h2 e3 A) }: ~: Q5 r) l
- ADC_ChannelConfTypeDef ADC1_ChanConf;
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. q' v# [' t0 o* V" Q8 |) B) ^9 ~5 @- TIM_HandleTypeDef TIM2_Handler; w0 |1 V$ E; ^( [) Q2 d
- TIM_OC_InitTypeDef TIM2_CH2Handler;
" A4 [/ O% @6 M+ w! d8 h9 z8 k9 q- A' L - uint16_t buffer[128];
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5 {* T: }* Z& ~" o" I4 h- f- static void MX_TIM2_Init(void)
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; @0 ?7 C$ h- J - __HAL_RCC_TIM2_CLK_ENABLE();
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! }8 ^9 n, U" ~8 K9 l+ s - HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
! r5 I2 S. f- n* p - HAL_NVIC_EnableIRQ(TIM2_IRQn);/ D4 O. w: x* [7 Q {& w
1 f+ Q4 W; }5 s4 x3 \- TIM2_Handler.Instance = TIM2;
& I8 d& E4 Y0 A! A5 h - TIM2_Handler.Init.Prescaler = 10800;( ?, `6 _5 V* h" i. L( M* a- k
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;& P: j g8 {" I, V: D" b
- TIM2_Handler.Init.Period = 20000;. O7 i4 W! P- I8 F; z E
- TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;- ?8 O1 B- s3 Y+ H; W
% H; `9 u8 \5 O7 s8 `( |- HAL_TIM_PWM_Init(&TIM2_Handler);
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- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
! S6 i- |8 A# ]6 _- Y+ S' G3 N7 r - TIM2_CH2Handler.Pulse = 10000;' k6 F! N; y/ X' u8 r/ B. L
- TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
; V8 F+ S( f- h' ~9 a2 _ - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;. I( o0 l8 v( \* }* M7 @( q1 m% Z+ D
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
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- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);9 s) s: }$ @/ y+ l
- TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);4 z2 a, ?3 G2 l2 a
- __HAL_TIM_ENABLE(&TIM2_Handler);
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- void TIM2_IRQHandler(void)
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- HAL_TIM_IRQHandler(&TIM2_Handler);; G, ]1 T0 t! b1 y; _2 a
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% S% N1 J& T: \- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
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% A6 z# r y6 C8 K/ m - if (htim == (&TIM2_Handler))9 @/ d, q' I$ Q: ]$ E0 a
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- printf("timer irq\r\n");' p1 g c6 ~4 i Q& d1 m# H
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- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)5 i" a1 z: i5 F
- {
* I/ R* i: ?7 C# @. `( l - GPIO_InitTypeDef GPIO_InitStruct = {0};
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8 ]. `$ F& C4 D2 l1 R( \! W- __HAL_RCC_TIM2_CLK_ENABLE();
3 l; u* ?8 K" e - __HAL_RCC_GPIOA_CLK_ENABLE();9 C" I* z ~4 O) O) |& j) \! w
- GPIO_InitStruct.Pin = GPIO_PIN_1;# C4 r# }3 [# K1 Z) V1 H
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; `) m" z" k" N4 Y* P2 q
- GPIO_InitStruct.Pull = GPIO_NOPULL;( |' `( i- B+ q
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
) Z) B5 s8 ^4 y6 A! B- j - GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
& a; s' k) O8 i% |9 T/ a) D - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);- R8 x; e' |) i1 M
- }
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! E1 j7 p/ B8 G1 }! [" `2 ^9 K- //初始化ADC Z6 K# P& u2 ~8 S! x
- //ch: ADC_channels: d$ ] P- l' n. v
- //通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
5 `; J- j$ J5 Y* @' t - void MY_ADC_Init(void)
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- __HAL_RCC_DMA2_CLK_ENABLE();
& [* s( ~+ a! N; n! M - HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
; e. t! y& _. n6 j- c - HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);" \: B ^9 Q* P7 [& c
- x( z3 G$ n" S4 \1 G* f- ADC1DMA_Handler.Instance = DMA2_Stream0;
J# o. p2 O n/ k5 ?) u% Q5 U. a - ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;2 \1 Y' ^. }+ K0 E- _7 X$ s' _& |
- ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;
3 z+ T+ q1 A: T0 F - ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
5 i8 N+ E' Y' R& G! p1 @ - ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式+ O# O+ N' m/ h: O! ^! z) _0 R# f
- ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位3 L: ^, `$ S/ q* c8 i( t; }/ j
- ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位8 k [9 f* D- S: X
- ADC1DMA_Handler.Init.Mode = DMA_CIRCULAR; //传输一次就结束, i+ Z4 q8 H$ B9 ]/ L+ G! I
- ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级
# k- q/ ^' g2 U9 M, ] - ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/
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6 g7 g0 K3 N1 U- HAL_DMA_Init(&ADC1DMA_Handler);1 H( q" {7 K/ h) R9 b6 p6 r. A
j2 X1 e3 `; e! {4 P& A: N- __HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
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# l; [6 D3 [3 _: a5 }% H- ADC1_Handler.Instance = ADC1;
/ n7 L* C! D2 r2 A% a$ v$ H - ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ
) J, n2 \4 y+ f# R/ n9 ]/ ]0 g - ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
3 k' s2 {; Q% b2 R, M2 X2 A8 P - ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式
V5 Q" I1 R4 _: `3 \* J7 `; \ - ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换/ W( {, O5 B0 [. R; s6 t7 ?
- ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式
$ @ [9 ]4 @1 y; T - ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //使用软件触发
7 y0 V) p R9 a/ N0 n6 E, a3 ?: b - ADC1_Handler.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //软件触发
6 q* F' T; I2 ]+ @; j - ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
# N' h9 q% |" Z/ P$ B5 ]3 ^ - 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: z! k6 }3 O; s7 z) r) s, N( ] P* M
- ADC1_Handler.Init.DMAContinuousRequests = ENABLE; //关闭DMA请求
1 U! V0 w2 Z! O( A8 I0 u - ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;, [& s; n5 N" _. P0 W) {# L4 k: O# H
- HAL_ADC_Init(&ADC1_Handler);' N1 S& z# L/ \! T" X5 R8 r+ T/ r
1 i e. w+ k# o; M3 [- ]- ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
2 g# Z8 n- f" d' G2 P - ADC1_ChanConf.Rank = 1; //序列1 S' R: d3 ?7 Z+ E( t0 b
- ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间$ a5 d3 ~) w6 m c3 ~
- ADC1_ChanConf.Offset = 0;
, d$ f$ x/ ~8 @0 J! ], I - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置6 ]; ?, l p1 V' `
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- ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道
* F8 [+ s; y- h1 `; I8 \ - ADC1_ChanConf.Rank = 2; //序列2
8 z+ K. v( @6 w( Q3 T1 v - ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间* T- h% h' o+ V
- ADC1_ChanConf.Offset = 0;
- q: [. [0 U% v- W - HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置( P/ D# Q7 _* s
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5 W0 Q$ j+ G: w# P5 [ - MX_TIM2_Init();
7 L9 }6 ?' Z; F& O% S, F9 Q3 B& e - HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 128);
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3 x. m3 |! a6 X; e- //ADC底层驱动,引脚配置,时钟使能0 y9 d( z1 f+ y
- //此函数会被HAL_ADC_Init()调用
! `) k% r: Q. f1 M) c+ R - //hadc:ADC句柄
; j% D7 f7 U+ B' M - void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)- Z! Z! f! h( |) B7 G
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- GPIO_InitTypeDef GPIO_Initure;
4 }/ L7 q) O: d - __HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟
1 W, J" D( f+ X7 F. y/ X - __HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟
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4 {# R) ]" A& v5 [) y4 z9 B! }" S- GPIO_Initure.Pin = GPIO_PIN_5 | GPIO_PIN_6; //PA5
% b- A* z: T$ S) {7 z/ i - GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟; z+ }9 o+ X4 d0 u5 R9 C/ l
- GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉5 f j% f% C5 P
- HAL_GPIO_Init(GPIOA, &GPIO_Initure);# Z7 `9 _0 F' |) G2 X, s
- }
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- void DMA2_Stream0_IRQHandler(void)
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( x1 f% g5 [2 C# l- } - HAL_DMA_IRQHandler(&ADC1DMA_Handler);. o2 r0 B" R/ _: y4 d, o
- }
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* D; O) t' H5 B" z Q+ T% X# _- void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
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" e, G; M. Q% K: ?. Q- x - printf("DMA transfer complete\r\n");2 R$ j% a. l7 T# w0 m t
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- void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
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$ g. k4 Y P. i I+ ?: V - printf("DMA Half transfer complete\r\n");, P9 i4 w0 j0 z* y! j4 g
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6 }! T1 b( ~, F- void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
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- printf("DMA transfer error\r\n");/ E* T3 U: F; w
- }
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复制代码
- {, T& u, T I' L7 T" [! L" I4 Zmain.c: Q6 O+ T- B# U2 j6 m
- #include "sys.h") o( S: F& b& Z# L+ d
- #include "delay.h"
8 y/ u8 m- k) _& d6 }6 S - #include "usart.h"
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- #include "adc.h"
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- extern uint16_t buffer[128];
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- void show()
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- int i;
7 i4 ?. V# v. H$ v/ D" T" H! _$ F. h4 f - printf("\r\ndata:");
1 v7 o1 f' l0 ] - for (i = 0; i < 128; i++)1 A! I/ \9 Q( M
- {
: Z8 e+ e% L; a* J' y - if (i % 16 == 0) printf("\r\n");* ?" N, f" k6 I/ [, u
- printf("%6d", buffer[i]);, g. l# S1 l/ \6 W2 M2 B
- //buffer[i]=0;/ _% d3 s2 |7 [# s7 t
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- printf("\r\n");8 I* T$ h9 A, c; R/ G
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- R0 R. V0 P! O [- int main(void)5 L2 j. P# X+ e" N# c' I/ k
- {
0 `3 \( M# k- E' P# o8 A6 X: y! p. I - //Cache_Enable(); //打开L1-Cache7 F/ c+ a4 e# R* l: g
- HAL_Init(); //初始化HAL库5 m- y: w' _5 y2 [8 N
- Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
E) p3 W& `! R! O - delay_init(216); //延时初始化
6 K1 h$ K3 G6 r' ]1 o' F, ` - uart_init(115200); //串口初始化5 `# z2 H1 w- z+ F7 ~1 E
3 d6 f$ R$ R2 g2 C/ R- printf("\r\n\r\n\r\n---------------------------------------\r\nstart\r\n");& E7 I+ B, s' \4 q( v0 ]2 I7 x& A
- MY_ADC_Init(); //初始化ADC1通道5
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, S% F% `9 G2 x3 z% k - while (1)7 R2 O6 B% ~- P& C5 [
- {
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7 k, x$ I9 g* @. D& ~/ x: A - //printf("cnt:%d\r\n",TIM2->CNT);% |8 N3 K$ {4 o+ H$ B
- delay_ms(1000);+ c5 ?7 h5 Z0 N! ]4 @# v
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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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