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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/ p6 l' r- x7 J L- m7 O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( B) c% y/ ]6 X+ C, m# S) \
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- /* Private variables ---------------------------------------------------------*/! |+ h1 }* Q$ x7 _; G
- ADC_HandleTypeDef hadc1;
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4 b+ w: A8 R0 r+ W }$ t- /* USER CODE BEGIN PV */
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- |+ R( V9 w3 ?- X- /* Variables for ADC conversion data */
4 j" G$ H7 o8 C, t9 | - __IO uint16_t uhADCxConvertedData = VAR_CONVERTED_DATA_INIT_VALUE;; /* ADC group regular conversion data */) Q6 T8 U7 @& X' T4 v* U
) |0 r3 L, U* i. o9 @. J- /* Variables for ADC conversion data computation to physical values */
# b/ F' {- O1 ?7 S% g; e4 h4 \7 o9 h - uint16_t uhADCxConvertedData_Voltage_mVolt = 0; /* Value of voltage calculated from ADC conversion data (unit: mV) */2 C2 s* ^. x( {# N. O& B
- ' O/ g. o$ _' U5 C( B
- /* Variable to report status of ADC group regular unitary conversion */
( Z6 R+ m4 p- m+ }. i6 ^: U - /* 0: ADC group regular unitary conversion is not completed */
' D6 i+ `, q) o7 m9 F - /* 1: ADC group regular unitary conversion is completed */
# u% ^+ o& ^* D$ ? - /* 2: ADC group regular unitary conversion has not been started yet */0 A o9 l" i; d# U' ~9 i
- /* (initial state) */0 k! ]3 s( ^0 b5 l
- __IO uint8_t ubAdcGrpRegularUnitaryConvStatus = 2; /* Variable set into ADC interruption callback */3 o- x. R; {+ @9 P' E- a! c
- 4 y& q/ x3 G/ m" E2 ^5 a- G6 n
- /* 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。
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8 X$ i3 ^0 L9 J0 l! N7 [转换程序的演示程序
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- /* Perform ADC calibration *///校准开始
8 [9 x, U6 B: F9 H" w. \9 c6 v3 U - if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED) != HAL_OK)
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- /* Calibration Error */
* l! Q. V9 q6 D% W" r - Error_Handler();5 d6 a; D/ C' J; Y
- }
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- /* USER CODE END 2 */. K/ u2 s) l8 ]+ U
8 h6 F3 W) O) j) Z C- /* Infinite loop */
% s# S; a) r H p" H - /* USER CODE BEGIN WHILE */
$ G W) W9 Q5 ^8 ~, f" Z - while (1)4 N# H& m- S! U( l
- {
( W3 |5 Y* r$ j5 r, H - /* Start ADC group regular conversion */
6 b8 t; q7 b$ W - //转换开始
# {+ _) h, d' A( D - if (HAL_ADC_Start_IT(&hadc1) != HAL_OK)
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" @, f# K: D: y! I" X! F# I - /* Error: ADC conversion start could not be performed */, m, X! U8 x" K, G* E \" ~( {
- Error_Handler();- I9 t2 M" \8 c3 L0 t
- }
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- /* For this example purpose, wait until conversion is done */
' P5 k: S% m8 J; B - //等待转换结束,出结果5 T. N5 D$ {! R; T, a
- while (ubAdcGrpRegularUnitaryConvStatus != 1);
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, Q3 f* N) s* U+ i$ M- /* Reset status variable of ADC group regular unitary conversion */
, t" [- \5 ]$ e J8 `' z - ubAdcGrpRegularUnitaryConvStatus = 0;
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4 ~% L o3 M) k( ]1 o8 `8 F/ Y$ w- /* Toggle LED at each ADC conversion */, [9 s( `0 j4 Z! G0 w+ y) \1 h0 G; P
- BSP_LED_On(LED1);: a% Z0 P6 b: \$ k- S# D4 y9 j
- HAL_Delay(LED_BLINK_SLOW);/ f5 g: k: f X0 D& W
- BSP_LED_Off(LED1);& V0 T% e$ l' L, N( z
- HAL_Delay(LED_BLINK_SLOW);
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- /* Note: ADC group regular conversions data are stored into array */' d' S5 p4 I: U# `; f& z2 u x
- /* "uhADCxConvertedData" */
/ H. _2 L' }$ j# R) v. t' p - /* (for debug: see variable content into watch window). */3 s9 \" z0 W: ]4 ~8 U2 ~/ p
0 A X; u; z7 }- /* Note: ADC conversion data are computed to physical values */
/ g, A4 k2 i* }1 `& n - /* into array "uhADCxConvertedData_Voltage_mVolt" using */
3 i" C' t! H5 Z6 T: V - /* ADC LL driver helper macro "__LL_ADC_CALC_DATA_TO_VOLTAGE()" */
+ m9 l" G1 B2 x, Q: s - /* (for debug: see variable content with debugger) */
! j( p1 p" X8 U2 X. h. B I - /* in IRQ handler callback function. */
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- /* USER CODE END WHILE */2 f+ v# {7 }8 [+ e" }# j1 u1 D+ K
, U% i) ]) `) H8 S2 i' V m- /* USER CODE BEGIN 3 */
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# a1 H, S5 ?. X: ` y5 u: k0 } - /* USER CODE END 3 */8 O) L7 O) N* ]8 y. g
- }
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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。3 G& ]; @0 T! x8 Z5 J- D& Y
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- /**5 @3 B" S' ~- k3 `1 d. o! ^3 T
- * @brief This function handles ADC1 global interrupt.
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- void ADC1_IRQHandler(void)+ R0 ~7 J; s' `, p8 f1 f) N
- {
! N# o; ?1 J6 j { - /* USER CODE BEGIN ADC1_IRQn 0 */1 q' G3 ]7 E* X1 E' l' M% e
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- /* Customize process using LL interface to improve the performance */
. M! y( i' `! D+ V/ r4 c9 M' H$ M - /* (exhaustive feature management not handled). */4 M) e) }5 v3 `; I: k7 J% S& c: M5 L
# q5 q# O" @/ w6 \- /* ########## Starting from this point HAL API must not be used ########### */, M2 N6 K3 {% K$ o
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- /* Check whether ADC group regular end of unitary conversion caused */1 o9 W( R/ Z9 b& B8 D7 v
- /* the ADC interruption. */
/ g0 v, e" J+ _+ R1 I, f- Y - if(LL_ADC_IsActiveFlag_EOC(ADC1) != 0)- A% Z8 p; E8 G; g* o; T' ]: ~
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- /* Clear flag ADC group regular end of unitary conversion */, ?& U8 Q$ c K5 A
- LL_ADC_ClearFlag_EOC(ADC1);
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Y, V% I* M9 Q1 N5 E" T- /* Call interruption treatment function */
, m9 t: \/ K) i( V$ O, {7 d - AdcGrpRegularUnitaryConvComplete_Callback();
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4 Q1 B# Y7 h ~; |( {, r, p- /* Check whether ADC group regular overrun caused the ADC interruption */, r4 `- e* f. \% s2 L6 `4 N
- if(LL_ADC_IsActiveFlag_OVR(ADC1) != 0)+ q5 Z- ]" Y( p' o O
- {
0 a* H3 @$ Y3 P% ~6 o3 l4 ~ - /* Clear flag ADC group regular overrun */
- I+ c# {7 @; o U: Y - LL_ADC_ClearFlag_OVR(ADC1);
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- /* Call interruption treatment function */1 b# g! x9 T0 ^- N* A
- AdcGrpRegularOverrunError_Callback();5 z8 h8 O- e% i( c0 y+ m
- }
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# i! Z) n" @: `- w# o. k5 v; U- /* USER CODE END ADC1_IRQn 0 */
* m5 E" V8 z# l - /* USER CODE BEGIN ADC1_IRQn 1 */
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- /* USER CODE END ADC1_IRQn 1 */
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& d9 o# t5 |$ s5 M2 X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。 - /**
2 Z. u4 N* O" b9 a - * @brief ADC group regular end of unitary conversion interruption callback
! Y3 q0 U/ m) T6 x - * @retval None
1 p) k- p' w% W& Q - */void AdcGrpRegularUnitaryConvComplete_Callback()
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) e3 m8 c' I7 j - /* Retrieve ADC conversion data */
- O7 k! R7 W1 g6 k% O8 Q8 }& x - uhADCxConvertedData = LL_ADC_REG_ReadConversionData32(ADC1);
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/ T- @' s8 z& z+ k, E& S+ F0 Z- /* Computation of ADC conversions raw data to physical values */6 r& k7 \) t# W( W: A
- /* using helper macro. */* ]( R3 Y; O; i
- uhADCxConvertedData_Voltage_mVolt = __LL_ADC_CALC_DATA_TO_VOLTAGE(VDDA_APPLI, uhADCxConvertedData, LL_ADC_RESOLUTION_12B);
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- /* Update status variable of ADC unitary conversion */* A, I Z$ }' R) t7 k
- ubAdcGrpRegularUnitaryConvStatus = 1;
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8 s# U ~6 @# p o- /**
& O& k/ S$ g+ z - * @brief ADC group regular overrun interruption callback
6 q _# D) r- ]* \" [ - * @note This function is executed when ADC group regular& C! ~5 Z, d3 H5 a" j: R$ v
- * overrun error occurs.
' `" M' k1 g X# d - * @retval None! o* K, Y- l' U
- */8 a$ j) r6 d$ o( i; _: M1 z* d
- void AdcGrpRegularOverrunError_Callback(void): e" B2 t$ |; L5 u0 a* [: [
- {
?; h3 B: G) V/ ~' w, _ - /* Note: Disable ADC interruption that caused this error before entering in
& ^- p6 T% e# S - infinite loop below. */
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- /* In case of error due to overrun: Disable ADC group regular overrun interruption */ p" k+ i+ {- w' c
- LL_ADC_DisableIT_OVR(ADC1);
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/ w% q5 f6 S! ^- /* Error reporting */
: R6 ]: M# U' ~- G - Error_Handler();% M f$ P9 B7 S E: T6 N+ h: O
- }
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