测试STM32H5的ADC,首先参考一下例程 ADC_SingleConversion_TriggerSW_IT,这是 cube 自带的例程,打开 cube 先看一下设置,例程使用了引脚 PC0,这个脚和板子的 A1 相连接。STM32H5 有两个 ADC 核心,设置为ADC1和CH10,引脚信号为单端信号 Single-ended
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5 `* {2 }. F% e1 I) v引脚设置关键是时钟速率 Clock Prescaler 和 Resolution,速率为4分频,分辨率为12,需要中断开启。转换组设置 ADC_Regular_ConversionMode 为软件开启,而不是使用硬件联动触发的方式
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- /* Private variables ---------------------------------------------------------*/
2 ~7 \3 N: X5 c - ADC_HandleTypeDef hadc1;6 z1 K1 G2 ~7 ?8 t: F
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- /* USER CODE BEGIN PV */' l9 ^5 Z) i/ {% J2 _1 J
1 P( Q$ v4 s; d3 b0 u# i* P9 E- /* Variables for ADC conversion data */
3 t' s O- d0 c$ Z. R5 F6 F - __IO uint16_t uhADCxConvertedData = VAR_CONVERTED_DATA_INIT_VALUE;; /* ADC group regular conversion data */! e5 M% r6 X& w+ B' z6 W, j# {
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- /* Variables for ADC conversion data computation to physical values */
. Z0 H: N2 ]/ a7 X9 `0 v* M9 j - uint16_t uhADCxConvertedData_Voltage_mVolt = 0; /* Value of voltage calculated from ADC conversion data (unit: mV) */. D, M# }. x- W9 C4 d
" g$ X/ F9 A/ N$ b N- /* Variable to report status of ADC group regular unitary conversion */
Z: ~, b& r! ~- X* S7 e9 a# ` - /* 0: ADC group regular unitary conversion is not completed */
9 d! _- B3 y5 V5 y5 R - /* 1: ADC group regular unitary conversion is completed */# D1 s4 b! q, [1 y+ D- b( R; H+ Q
- /* 2: ADC group regular unitary conversion has not been started yet */
' v: T) ]& d$ N5 E - /* (initial state) */ c8 h" H* p6 w
- __IO uint8_t ubAdcGrpRegularUnitaryConvStatus = 2; /* Variable set into ADC interruption callback */
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- /* USER CODE END PV */
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程序定义了一个 ADC 的转换变量 uhADCxConvertedData,注意:这里必须声明为 "__IO uint16_t",这个是为了让编译器不去优化该变量,直接去地址寄存器取值,在高速 MCU 中很关键,尤其在开启 ICACHE 的状态下。还有一个状态变量 ubAdcGrpRegularUnitaryConvStatus,用来做转换标准。1 N5 }: d1 g$ K! x$ C. y
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: h# W* ^7 c" G! z+ t, d/ t$ [' k转换程序的演示程序
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- /* Perform ADC calibration *///校准开始
* z) v7 {5 N% j$ C( G. L - if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED) != HAL_OK)
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1 e$ K: H( P7 H ]1 K* l5 q - /* Calibration Error */7 n4 H- x% Y) b* D
- Error_Handler();
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- /* USER CODE END 2 */9 p) t6 i3 X" ^& \" H
! E* c c& o- E+ Z- /* Infinite loop */5 a! _. @) E1 o$ \" j. ^% T
- /* USER CODE BEGIN WHILE */$ Z: [+ V3 O* ~$ u# t( P/ z4 z0 r
- while (1)8 H3 {4 I4 F o/ _% n" F
- {
# @0 j) h0 e. x0 S0 c+ g - /* Start ADC group regular conversion */
( i% G' I( t% c - //转换开始) f" ~- c; D0 w0 l0 D" r/ j
- if (HAL_ADC_Start_IT(&hadc1) != HAL_OK)
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f1 S3 Z/ f d8 g - /* Error: ADC conversion start could not be performed */! k% h/ L* U# u `
- Error_Handler();
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- /* For this example purpose, wait until conversion is done */
9 F1 S5 b% b: T# [7 w - //等待转换结束,出结果" e2 z- a- c' F. [7 ~
- while (ubAdcGrpRegularUnitaryConvStatus != 1);3 \& T, S' _$ E E' B4 D
4 s" z% {; c, F0 y1 `- /* Reset status variable of ADC group regular unitary conversion */
( E# U5 t( R+ C - ubAdcGrpRegularUnitaryConvStatus = 0;
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8 K9 ^+ `! f1 y. n4 S& }$ f2 ?$ O- /* Toggle LED at each ADC conversion */
2 o* _" U, A0 E6 O - BSP_LED_On(LED1);
, p) H* Q4 l" B9 k' X w) E - HAL_Delay(LED_BLINK_SLOW);, L" N. ]8 s0 R
- BSP_LED_Off(LED1);
) S9 O0 g# P8 S+ i - HAL_Delay(LED_BLINK_SLOW);
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5 Z4 c' l0 O1 u7 D0 ]- /* Note: ADC group regular conversions data are stored into array */+ u, `" g* u2 S; p; f3 ~6 J
- /* "uhADCxConvertedData" */, \+ B# x# \. a2 K8 L% _* w( D4 y
- /* (for debug: see variable content into watch window). */
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) ~' [9 T% N6 [1 e- /* Note: ADC conversion data are computed to physical values */# H$ \" q# I# ]) A
- /* into array "uhADCxConvertedData_Voltage_mVolt" using */9 x D2 N) `: ?" Z: G
- /* ADC LL driver helper macro "__LL_ADC_CALC_DATA_TO_VOLTAGE()" */5 G) G8 q2 A/ ?2 R3 n D
- /* (for debug: see variable content with debugger) */5 r; C6 v; p1 ?0 \; G! w( q1 H
- /* in IRQ handler callback function. */4 Z! h5 g K! T5 l i
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- /* USER CODE END WHILE */* ^' W$ }: H: i6 \
- # |( D1 z4 e3 e! Q$ B; l
- /* USER CODE BEGIN 3 */
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! \4 F# E n" y* j1 x9 X* y: o7 o. r - /* USER CODE END 3 */6 Z1 s4 R( W" I+ m: P9 n
- }
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8 T2 s3 j3 r; C' J/ E/ f过程很简单,先初始化 ADC,在测试前先校准 ADC,然后开始转换 ADC 测量,等待 ADC 转换结束,这个程序用了中断程序。) F& ~6 ?+ Q T$ ?& o
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0 K* L* P( V, z9 @- /**. N+ x2 i l& e J
- * @brief This function handles ADC1 global interrupt." i9 e" y5 X Q
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- void ADC1_IRQHandler(void)+ U. N% r( S/ Y0 h1 K& j1 D
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- /* USER CODE BEGIN ADC1_IRQn 0 */3 I8 ?% e2 e4 n j" b. w9 k1 T4 d
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- /* Customize process using LL interface to improve the performance */
1 Z0 o) ]9 ?$ R; K( h- G$ T7 A1 j - /* (exhaustive feature management not handled). */
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- /* ########## Starting from this point HAL API must not be used ########### */
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, s. M) o3 o4 H" {- /* Check whether ADC group regular end of unitary conversion caused */* v3 b% W: D6 H- K2 J( G
- /* the ADC interruption. */
" G) a# r- C% t - if(LL_ADC_IsActiveFlag_EOC(ADC1) != 0)
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# r1 }2 s: a' T! j: ~" a - /* Clear flag ADC group regular end of unitary conversion */' ?8 F0 W% W7 ?; r8 l; n! H; y5 j
- LL_ADC_ClearFlag_EOC(ADC1);
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- /* Call interruption treatment function */
/ S1 I% O0 k& V. G9 Q* m - AdcGrpRegularUnitaryConvComplete_Callback();. {$ J; n' y- N1 H; L3 r7 x
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' Z1 X6 X- x P ~* i [- /* Check whether ADC group regular overrun caused the ADC interruption */) Y& w- ~; i/ S1 c! c. D
- if(LL_ADC_IsActiveFlag_OVR(ADC1) != 0): j; B$ D; {" j+ y4 T4 u# U
- {
: e, @* I9 \9 P- w7 `0 p5 F - /* Clear flag ADC group regular overrun */
9 b" Q5 f, c- U* z* ] - LL_ADC_ClearFlag_OVR(ADC1);
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- /* Call interruption treatment function */
$ U# Z) L X- Z! ~" p; q - AdcGrpRegularOverrunError_Callback();9 U: A& ~( x. X3 U8 C
- }
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- /* USER CODE END ADC1_IRQn 0 */
& ]% I" d8 ? J# t$ j/ F" } - /* USER CODE BEGIN ADC1_IRQn 1 */! P+ h) Y' \& [; ~! i
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- /* USER CODE END ADC1_IRQn 1 */, h6 a3 q! F' \5 k9 H- J6 \
- }
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& V- P3 x4 @4 D中断处理也很简单,首先判断是不是 ADC1 的"测量规则组"转换是否结束是则清除,完成后调用 AdcGrpRegularUnitaryConvComplete_Callback 函数,该函数中对主函数中的标志变量 ubAdcGrpRegularUnitaryConvStatus 进行设置。判断是否是 ADC1 中断转换完成标志,是则清除。 - /**
. m8 D. }0 a' P' M$ t- S) q - * @brief ADC group regular end of unitary conversion interruption callback( K/ ~/ P# ]: N+ o" M) x
- * @retval None& B' e0 L) O3 e
- */void AdcGrpRegularUnitaryConvComplete_Callback()
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) U$ [& ~1 R0 W) ^. @ - /* Retrieve ADC conversion data */
* }' m! k1 b+ ~0 a, [+ |, o - uhADCxConvertedData = LL_ADC_REG_ReadConversionData32(ADC1);( u( g. j7 [3 d; V
) Z7 H# L5 x$ r. C/ S$ v/ O- /* Computation of ADC conversions raw data to physical values */7 e/ {% o: \" s2 L) h
- /* using helper macro. */$ _% o9 C' M9 A9 T! x. y
- uhADCxConvertedData_Voltage_mVolt = __LL_ADC_CALC_DATA_TO_VOLTAGE(VDDA_APPLI, uhADCxConvertedData, LL_ADC_RESOLUTION_12B);. @6 S, q" d: [0 [2 U% Q
" |) R$ J( i4 h+ }- /* Update status variable of ADC unitary conversion */7 n# t$ C7 u8 r3 b1 Z Y
- ubAdcGrpRegularUnitaryConvStatus = 1;7 @! L5 ?& W. _5 m6 |3 f5 Y! k* |
- }
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- /**+ Y2 j* z# a ^. f$ W
- * @brief ADC group regular overrun interruption callback" d: X0 n: \1 r: }4 A
- * @note This function is executed when ADC group regular
" n# Y' z) e; `0 g7 `5 { - * overrun error occurs.( ~" p$ ?' w3 E
- * @retval None
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- void AdcGrpRegularOverrunError_Callback(void)# A3 K, t2 ?/ s4 I7 Z9 j/ W: X
- {
3 C0 K2 G1 `9 f6 Y: ]+ f0 E; x4 {0 } - /* Note: Disable ADC interruption that caused this error before entering in8 g$ O9 \0 s% H$ z# R+ j; {
- infinite loop below. */
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# A9 m! x! Q- Z, {! t+ L- /* In case of error due to overrun: Disable ADC group regular overrun interruption */
0 F5 \: S. W' r7 t - LL_ADC_DisableIT_OVR(ADC1);
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- /* Error reporting */
, N$ F8 f1 t% Y! K9 A5 d! y - Error_Handler();( ], N W7 \6 `4 q
- }
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