一,ART-Pi 是什么
1 r% z' m$ Q) s6 n* l; s& fART-Pi 是 RT-Thread 团队为嵌入式软件工程师、开源创客设计的一款极具扩展功能的 DIY 开源硬件。致力打造一个开源的软硬件平台。详细资料都可以从 ART-Pi主页 来获取。
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二,ART-Pi 全速运行时的温度/ j- M; M% ]' Q& c
相信每一位第一次使用 STM32H7 系列 MCU 的用户都会被他的发热量吓到,内心 OS:这个板子是不是有问题,第一次遇到这么热的 STM32。时间长了的用户都会知道只要手还能摸得住说明就是正常的。但是这个温度到底是多少呢?
5 E! `2 A1 x0 y) X' a- s5 j [. p因此我做了一个读取 MCU 内存温度的实验; S; O0 @5 V' Z) Q
主频为 480M 时的温度:- [40978145] D/board: System Clock information
y, {$ x2 z. o - [40978153] D/board: SYSCLK_Frequency = 480000000# [9 u# a$ K+ [% S V
- [40978162] D/board: HCLK_Frequency = 240000000
: v' k$ ~0 G3 i - [40978171] D/board: PCLK1_Frequency = 120000000
, @# V& O' @; J6 @' D6 b+ e - [40978180] D/board: PCLK2_Frequency = 120000000
, v8 e3 d" Q# g - [40978188] D/board: STM32H7 temp is 49.610136
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+ @) B+ L& l0 P5 [主频为 120M 时的温度:
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8 Z9 Q; G" W/ t" ]3 [* P3 ?# W- [33922714] D/board: System Clock information
) m7 J4 Q; |/ n4 K- }* a - [33922722] D/board: SYSCLK_Frequency = 120000000, g/ Z1 Q/ r, D7 }
- [33922731] D/board: HCLK_Frequency = 60000000
! G5 I5 B9 a; l& ?. N+ }5 h* d# y' q4 f - [33922740] D/board: PCLK1_Frequency = 30000000& Z5 K* l5 N. _ V
- [33922749] D/board: PCLK2_Frequency = 30000000 Q" {2 t: T/ ^8 F( b
- [33922758] D/board: STM32H7 temp is 32.261209
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如何实现测量 STM32H7 的内部温度:3 |$ w! S5 ? t( _
# f5 }9 V5 w: [1 m在 CUBEMX 中打开 ADC3-IN18 的测量引脚,这个是自带的测量温度通道:
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温度的计算公式
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TS_CAL2 的值保存在 :0x1FF1E840
; ^+ i, s7 E0 JTS-CAL1 的值保存在:0x1FF1E820" `1 {( K: g! {3 Y
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所以可得: l* `( b1 V) @8 I) G+ \# y
- adc_v = HAL_ADC_GetValue(&ADC3_Handler);
! N. p1 O5 u; D* H( O - adcx = (110.0-30.0)/(*(unsigned short*)(0x1FF1E840) - *(unsigned short*)(0x1FF1E820));
8 q% `+ @5 V2 ?, K6 k3 R* c, Y# Q - temp = adcx*(adc_v - *(unsigned short*)(0x1FF1E820))+30;
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- z3 V( v' r7 e# j4 Z. WADC 的初始化% z4 x0 M& ]8 o0 q4 ~, e
ADC 的初始化代码就比较常规了,简单的测试也就不需要使用 DMA 等配置; c! Y* u, l W) w) {$ D; P
- ADC3_Handler.Instance=ADC3;
& e& E9 g% |, E; i& U. e6 u( K4 ~ - ADC3_Handler.Init.ClockPrescaler=ADC_CLOCK_SYNC_PCLK_DIV4;& V' b* [3 `; _5 F
- ADC3_Handler.Init.Resolution=ADC_RESOLUTION_16B;. m# Q9 _# j; ^2 F
- ADC3_Handler.Init.ScanConvMode=DISABLE;( x! M9 a% X5 l0 E
- ADC3_Handler.Init.EOCSelection=ADC_EOC_SINGLE_CONV;/ J. v/ p. \* V* {& M. m0 s
- ADC3_Handler.Init.LowPowerAutoWait=DISABLE;
2 p9 n# d6 G* _3 {- G5 g+ r6 S - ADC3_Handler.Init.ContinuousConvMode=DISABLE; " M0 Z% f/ L; z
- ADC3_Handler.Init.NbrOfConversion=1;
: p D/ H, O0 J! q: p - ADC3_Handler.Init.DiscontinuousConvMode=DISABLE;+ ~; I) ?* f6 O1 ?- n3 R9 I8 w
- ADC3_Handler.Init.NbrOfDiscConversion=0;2 x1 ?0 W( a I$ |& U- s) \
- ADC3_Handler.Init.ExternalTrigConv=ADC_SOFTWARE_START;8 C. o2 D7 ~$ U) }. {& x
- ADC3_Handler.Init.ExternalTrigConvEdge=ADC_EXTERNALTRIGCONVEDGE_NONE;0 B+ Z6 {: N/ q9 q# w0 F- m
- ADC3_Handler.Init.Overrun=ADC_OVR_DATA_OVERWRITTEN;& E3 ?* r4 h `2 ^6 A4 U; Y
- ADC3_Handler.Init.OversamplingMode=DISABLE;
/ E/ P1 o6 `" ~# U7 `$ q - ADC3_Handler.Init.ConversionDataManagement=ADC_CONVERSIONDATA_DR;- e$ l2 E R Y) F. N& G+ v8 `: [2 ?
- HAL_ADC_Init(&ADC3_Handler);$ F- \0 q9 w8 H( o* ~/ N- t
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- HAL_ADCEx_Calibration_Start(&ADC3_Handler,ADC_CALIB_OFFSET,ADC_SINGLE_ENDED); $ N/ s' [ C" B5 @0 p5 d; |* }: P
$ B: d' m* {1 d7 f/ g- ADC_ChannelConfTypeDef ADC3_ChanConf;
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+ T3 N% V; p" V- ADC3_ChanConf.Channel=ADC_CHANNEL_TEMPSENSOR;
9 V8 R6 d+ X9 D" W, l8 R' ] - ADC3_ChanConf.Rank=ADC_REGULAR_RANK_1;
# _; k+ j, F p: C4 T n! u - ADC3_ChanConf.SamplingTime=ADC_SAMPLETIME_810CYCLES_5; - c5 |* r4 a! p8 l' A
- ADC3_ChanConf.SingleDiff=ADC_SINGLE_ENDED;
) r* E! k# i& j; L* z7 C y - ADC3_ChanConf.OffsetNumber=ADC_OFFSET_NONE;0 A: e2 y+ q- W5 |( Z8 |! _
- ADC3_ChanConf.Offset=0; g, w: u; T* e/ E. a" f6 y, _6 l
- HAL_ADC_ConfigChannel(&ADC3_Handler,&ADC3_ChanConf);, c. x% E6 H' @+ {$ |4 a
$ v! _3 `" \7 Q) x1 F+ I- return 0;
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获取温度与系统时钟的频率4 a8 M5 ?( N6 [. ]/ a" Y6 b
- unsigned int adc_v;
' ?4 d2 B, n- `0 e. w y - double adcx; Q) @/ T1 k1 {! x& i6 G4 k; K
- double temp;
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( E- Q4 Y2 ]/ B/ A8 a$ a! V4 }7 Q' t( z- HAL_ADC_Start(&ADC3_Handler);7 N) \* M. L# V+ f# @
- HAL_ADC_PollForConversion(&ADC3_Handler,10);
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- LOG_D("System Clock information");7 ~" w; Y, U# M: M, ~8 Y
- LOG_D("SYSCLK_Frequency = %d", HAL_RCC_GetSysClockFreq());1 L5 G) M1 z) ?0 U9 ]
- LOG_D("HCLK_Frequency = %d", HAL_RCC_GetHCLKFreq());
! K1 r( G3 U' G/ Q0 ]" l1 h' e! K - LOG_D("PCLK1_Frequency = %d", HAL_RCC_GetPCLK1Freq());: U+ t- |5 z) ?# p# O: H
- LOG_D("PCLK2_Frequency = %d", HAL_RCC_GetPCLK2Freq());
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! i) y9 p2 }7 Q, r- adc_v = HAL_ADC_GetValue(&ADC3_Handler);
- b3 l8 S4 j* j. n: x: f9 F* } - adcx = (110.0-30.0)/(*(unsigned short*)(0x1FF1E840) - *(unsigned short*)(0x1FF1E820));
( y8 g0 ?5 {, d' k' g* u) U - temp = adcx*(adc_v - *(unsigned short*)(0x1FF1E820))+30;
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! \ g o& j3 _' ^- LOG_D("STM32H7 temp is %f",temp);
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+ C! S0 h8 K/ K" S/ R1 }三,未完待续3 m$ S6 F- m2 G( A
后续测试了不同频率,不同编译器,不同优化选项的性能对比,后续结果放在了传送门, 整个测是工程也开源在了 GITEE,欢迎 Start.1 A. {: J2 f& Z
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