STM32驱动LIS25BA

littleshrimp 发表于 2019-11-20 14:31

<div class='showpostmsg'> 本帖最后由 littleshrimp 于 2019-11-20 14:32 编辑

先来一段使用LIS25BA录制的小朋友说话声

 

LIS25BA是ST推出的一款低噪声高带宽加速度传感器，最大输出速率可达24KH，可以用来采集音频信号。

官方有用它和MEMS麦克风结合降噪的演示，但是没有提供设计文件和固件源码，这些都要自己去摸索。

这款传感器使用I2C+TDM接口，I2C用来配置寄存器TDM用来读取加速度数据，和一些音频编解码器有些类似。

前段时间论坛活动送了一些LIS25BA的评估板，有一些网友在测试中也遇到了一些问题，一方面是因为使用TDM接口，不是搞音频的很少能接触到，而且很多单片机不一定都支持这种接口，另一个最主要的原因还是因为它使用1.8V电平，需要配一个电平转换才能正常使用。

我没接触过那些高端DSP，手里支持TDM接口的板子不多，STM32的板子的SAI接口可以配置成TDM模式，不考虑电平兼容问题应该算是最适合的，也是唯一的选择。

将我手里的IKS01A3做了改动，凑齐了SCL、SDA、MCLK、WS、SCLK、SD这六条数据线，电平的问题解决剩下就是I2C配置和TDM读取。

配置方面LIS25BA比较简单，一共7个寄存器，实际只需要配置2个即可



弄好I2C后一定要试着读取一下WHO_AM_I寄存器判断I2C总线是否能够正常工作，还有器件地址是否正确。

ST提供的评估板的I2C_A0引脚悬空并预留选择焊盘，需要自己将它焊到VDD或者GND，因为是柔性PCB焊盘又很小我一直没敢动它，试着用I2C读了一下0x19这个设备地址，发现可以正常读取到WHO_AM_I，所以这个焊盘就先不管它了。

寄存器配置方面一个是CTRL_REG (26h)的第5位需要设置为0，使器件工作



然后是TDM_CTRL_REG (2Eh)的第7位需要配置为0，mapping选择0时slot的0，1，2对应X,Y,Z轴数据，这个可以根据实际情况设置，TDM_CTRL_REG (2Eh)的其它位也需要根据实际情况来配置，这些配置应该和STM32的SAI配置相对应，数据手册的4.5 TDM configurations中有详细介绍。



 

解决I2C的配置问题后接下来处理TDM接口

使用STM32CubeMX创建一个工程，我使用的开发板是STM32L4R5（只要支持SAI接口的STM32单片机应该都能用），在SAI模式选择Master，虽然里边还有一个Master with Master Clock Out的选项可以直接通过一个引脚输出MCLK时钟给LIS25BA，但是它的配置不能满足LIS25BA的要求，需要单独生成。



其它配置如下：

Protocol选择Free

Audio Mode 选择Master Receive

Frame Length选择128bits，每个slot=16bit一共8个slot

Data Size选择16bits,Slot Size选择和DataSize相同，Slot Sizes可以大于Data Size但不能小于Data Size，Slot Sizes大于Data Size时，有一部分数据位相当于是丢弃的。

FrameSynchro..主要用来设置WS数据线的规则，为了测试方便Slot Active只使能 Slot2，对应LIS25BA的Z轴



剩下需要设置对应的频率和读取数据时使用的时钟沿等等



 

在DMA选项卡中使能DMA，MODE选择Circular循环写入，DataWidth选择Half Word(16bit)



 

 

MCLK使用PWM生成，采样率设置成16KHz时实际的采样率为15.625KHz这个和主频有关，15.625KHz对应的BCLK频率正好是2MHz(15.625KHz * 128bit)

根据LIS25BA手册的要求采样率在16KHz时MCLK的频率是WS频率的768倍，15.625对应的MCLK频率为12MHz，所以使用定时器生成12MHz 50%占空比的PWM即可。



我使用120MHz的主频，定时器的Counter Period设置为10-1时正好为12MH。



 

STM32CubeMX配置好以后行成工程文件

在生成main.c中添加I2C配置代码



 

然后是使能PWM输出，延时一小会后启用SAI的DMA读取功能



 

实现DMA的回调函数，定义一个标志dma_flag在DMA读取到一半时配置为1

DMA读取完时配置为2



然后在主函数中判断DMA回调的类形，当读取到一半时通过串口发送DMA数据的前半部分，读取完时发送DMA数据的后半部分。



 

运行代码就可以将LIS25BA的Z轴数据通过串口发送到电脑

 

其实最简单的方法是通过USB实现一个Audio Device直接作为电脑的声卡使用，缺点是最多只能支持2个通道，如果想测试X,Y,Z这三个轴还是自己写一个上位机软件比较方便。

 

单片机的工作完成后接下来是电脑端的配置

设计一个简单的界面



一个combobox一个按钮

点击按钮后判断是否选择过存储录音文件的路径，如果没有打开选择文件对话框



 

选择好路径后会创建一个以当前日期为文件名的文件，然后将按钮名设置为“停止”，循环读取串口数据将并将数据写入到对应的文件，当再次点击按钮时停止读取串口，将当前的数据长度和头文件写入文件，生成一个完整的音频TXT文件。

为什么是TXT文件不应该是WAV或者mp3文件吗？因为我对这些音频文件不熟悉！！

TXT文件怎么播放? Adobe Audition可以直接读取。



 

上位机写好后点录音，就会在指定的目录下录制相应的音频文件，然后用audition读取即可

为了让声音效果更好些，我把LIS25BA粘在一段胶带的中心，用手接住两端，对着胶带说话录音的效果还不错，在离胶带1米处说话声也隐约能录到。

 

下边是audition里显示声音波形



 

对应的音频文件：



LIS25BA的单片机源码和上位机源码全提供，回复可见看看玩这个的传感器的人多不多。另外需要注意，录音时因为单片机一直在发送数据，以字节方式，上位机读取到的数据可能会不对齐，只要多点几次录音和停止就可以。具体可以看串口下边的加速度数值来判断数据是否已经对齐。

 



 
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duguyining 发表于 2019-11-22 10:52

请教一个问题，比如ST的三轴加速度传感器的ODR设置为952HZ，这是不是表示三个轴每秒能同时刷新952个数据，而不是每秒三个轴加起来共同刷新952个数据。

littleshrimp 发表于 2019-11-22 11:02

duguyining 发表于 2019-11-22 10:52
请教一个问题，比如ST的三轴加速度传感器的ODR设置为952HZ，这是不是表示三个轴每秒能同时刷新952个数据， ...

对，LIS25BA的ODR对应的是WS的频率，每一个WS周期可以有8个slot，每个slot16位，相当于每个ws周期都会更新3个轴的数据

duguyining 发表于 2019-11-22 11:14

可是我实际测试的时候，发现每秒钟只能输出三百多个三轴加速度数据。

duguyining 发表于 2019-11-22 11:27

不对，只有一百多个数据。

# RECV ASCII> 
I2C communication successd!!! 
ax = 0.000000, ay = 0.000000, az = 0.000000 
ax = 9.647861, ay = -0.710668, az = 0.918844 
ax = 9.734002, ay = -0.660419, az = 0.782453 
ax = 15.060425, ay = -3.129812, az = 20.315063 
ax = 9.662217, ay = -1.292124, az = 0.803988 
ax = 7.968099, ay = -1.507478, az = 0.725025 
ax = 9.626325, ay = -1.622334, az = 0.653241 
ax = 9.705288, ay = -1.356730, az = 0.660419 
ax = 9.820145, ay = -1.414158, az[8 
# RECV ASCII> 
] = 0.703490 
ax = 9.676575, ay = -1.012164, az = 0.868595 
ax = 9.812965, ay = -0.918844, az = 0.638884 
ax = 9.576076, ay = -0.882951, az = 0.868595 
ax = 9.748359, ay = -1.019342, az = 0.746561 
ax = 9.626325, ay = -1.033699, az = 0.969093 
ax = 9.475577, ay = -1.033699, az = 1.198804 
ax = 9.705288, ay = -1.191626, az = 0.832702 
ax = 9.525826, ay = -1.134198, az = 0.882951 
ax = 9.626325, ay = -0.976272 
# RECV ASCII> 
, az = 0.890130 
ax = 9.690931, ay = -1.048056, az = 0.803988 
ax = 9.568897, ay = -1.026521, az = 0.969093 
ax = 9.590433, ay = -0.897308, az = 0.969093 
ax = 9.719646, ay = -0.818345, az = 0.839881 
ax = 9.734002, ay = -0.990629, az = 0.746561 
ax = 9.683753, ay = -0.940379, az = 0.725025 
ax = 9.798608, ay = -1.263410, az = 0.739382 
ax = 9.597611, ay = -1.478764, az = 0.782453 
ax = 9.597611, ay = 
# RECV ASCII> 
 -1.536192, az = 0.725025 
ax = 9.590433, ay = -1.450050, az = 0.725025 
ax = 9.633504, ay = -1.177269, az = 0.725025 
ax = 9.712466, ay = -1.119841, az = 0.832702 
ax = 9.676575, ay = -0.976272, az = 0.768096 
ax = 9.690931, ay = -0.933201, az = 0.832702 
ax = 9.619146, ay = -1.026521, az = 0.832702 
ax = 9.626325, ay = -1.076770, az = 0.811167 
ax = 9.568897, ay = -1.091127, az = 0.969093 
ax = 9.482756 
# RECV ASCII> 
, ay = -1.048056, az = 0.882951 
ax = 9.604790, ay = -1.091127, az = 0.890130 
ax = 9.576076, ay = -1.055235, az = 0.796810 
ax = 9.604790, ay = -1.048056, az = 0.803988 
ax = 9.777073, ay = -1.105484, az = 0.732204 
ax = 9.726824, ay = -1.119841, az = 0.710668 
ax = 9.741180, ay = -1.234696, az = 0.725025 
ax = 9.640682, ay = -1.292124, az = 0.674776 
ax = 9.669396, ay = -1.349552, az = 0.782453 
ax  
# RECV ASCII> 
= 9.633504, ay = -1.227518, az = 0.667597 
ax = 9.726824, ay = -1.234696, az = 0.624527 
ax = 9.590433, ay = -1.141376, az = 0.660419 
ax = 9.726824, ay = -1.141376, az = 0.646062 
ax = 9.626325, ay = -1.040878, az = 0.753739 
ax = 9.611968, ay = -1.162912, az = 0.725025 
ax = 9.705288, ay = -1.234696, az = 0.667597 
ax = 9.554541, ay = -1.141376, az = 0.825524 
ax = 9.662217, ay = -1.184447, az = 0.71066 
# RECV ASCII> 
8 
ax = 9.669396, ay = -1.263410, az = 0.631705 
ax = 9.640682, ay = -1.177269, az = 0.674776 
ax = 9.791430, ay = -1.263410, az = 0.617348 
ax = 9.676575, ay = -1.213161, az = 0.631705 
ax = 9.748359, ay = -1.227518, az = 0.660419 
ax = 9.755538, ay = -1.363909, az = 0.531207 
ax = 9.712466, ay = -1.399801, az = 0.710668 
ax = 9.626325, ay = -1.320838, az = 0.681954 
ax = 9.640682, ay = -1.356730, az 
# RECV ASCII> 
 = 0.545564 
ax = 9.705288, ay = -1.249053, az = 0.710668 
ax = 9.698110, ay = -1.220340, az = 0.746561 
ax = 9.669396, ay = -1.004985, az = 0.638884 
ax = 9.734002, ay = -1.134198, az = 0.595813 
ax = 9.726824, ay = -1.205983, az = 0.689133 
ax = 9.698110, ay = -1.227518, az = 0.624527 
ax = 9.669396, ay = -1.256232, az = 0.782453 
ax = 9.583255, ay = -1.249053, az = 0.753739 
ax = 9.611968, ay = -1.1916 
# RECV ASCII> 
26, az = 0.775274 
ax = 9.676575, ay = -1.119841, az = 0.674776 
ax = 9.698110, ay = -1.069592, az = 0.746561 
ax = 9.655039, ay = -1.069592, az = 0.768096 
ax = 9.748359, ay = -1.162912, az = 0.760918 
ax = 9.583255, ay = -1.184447, az = 0.739382 
ax = 9.669396, ay = -1.170090, az = 0.746561 
ax = 9.705288, ay = -1.198804, az = 0.696311 
ax = 9.640682, ay = -1.256232, az = 0.746561 
ax = 9.619146, ay 
# RECV ASCII> 
 = -1.162912, az = 0.703490 
ax = 9.676575, ay = -1.170090, az = 0.760918 
ax = 9.748359, ay = -1.184447, az = 0.760918 
ax = 9.597611, ay = -1.141376, az = 0.753739 
ax = 9.640682, ay = -1.241875, az = 0.674776 
ax = 9.741180, ay = -0.983450, az = 0.710668 
ax = 9.726824, ay = -1.148555, az = 0.768096 
ax = 9.669396, ay = -1.148555, az = 0.638884 
ax = 9.511470, ay = -1.191626, az = 0.789631 
ax = 9.7052 
# RECV ASCII> 
88, ay = -1.299303, az = 0.732204 
ax = 9.698110, ay = -1.263410, az = 0.660419 
ax = 9.633504, ay = -1.184447, az = 0.746561 
ax = 9.590433, ay = -1.112662, az = 0.753739 
ax = 9.834500, ay = -1.198804, az = 0.509671 
ax = 9.626325, ay = -0.961915, az = 0.854238 
ax = 9.827322, ay = -1.198804, az = 0.430708 
ax = 9.489934, ay = -1.220340, az = 0.775274 
ax = 9.662217, ay = -1.292124, az = 0.696311 
ax[97 
# RECV ASCII> 
] = 9.561719, ay = -1.277767, az = 0.638884 
ax = 9.604790, ay = -1.227518, az = 0.653241 
ax = 9.741180, ay = -1.234696, az = 0.602991 
ax = 9.619146, ay = -1.205983, az = 0.710668 
ax = 9.698110, ay = -1.198804, az = 0.624527 
ax = 9.698110, ay = -1.213161, az = 0.617348 
ax = 9.647861, ay = -1.127019, az = 0.674776 
ax = 9.712466, ay = -1.205983, az = 0.5 
# RECV ASCII> 
52742 
ax = 9.547362, ay = -1.213161, az = 0.811167 
ax = 9.655039, ay = -1.313660, az = 0.617348 
ax = 9.662217, ay = -1.249053, az = 0.732204 
ax = 9.741180, ay = -1.177269, az = 0.595813 
ax = 9.712466, ay = -1.234696, az = 0.610170 
ax = 9.633504, ay = -1.213161, az = 0.624527 
ax = 9.690931, ay = -1.213161, az = 0.638884 
ax = 9.669396, ay = -1.320838, az = 0.660419 
ax = 9.67657 
# RECV ASCII> 
5, ay = -1.284946, az = 0.538385 
ax = 9.690931, ay = -1.292124, az = 0.681954 
ax = 9.741180, ay = -1.320838, az = 0.545564 
ax = 9.676575, ay = -1.342373, az = 0.567099 
ax = 9.784252, ay = -1.263410, az = 0.581456 
ax = 9.640682, ay = -1.270589, az = 0.588634 
ax = 9.583255, ay = -1.249053, az = 0.653241 
ax = 9.626325, ay = -1.141376, az = 0.760918 
ax = 9.676575, ay = -1.177269,  
# RECV ASCII> 
az = 0.646062 
ax = 9.705288, ay = -1.098306, az = 0.703490 
ax = 9.676575, ay = -1.105484, az = 0.775274 
ax = 9.690931, ay = -1.155733, az = 0.667597 
ax = 9.683753, ay = -1.155733, az = 0.732204 
ax = 9.640682, ay = -1.256232, az = 0.796810 
ax = 9.604790, ay = -1.234696, az = 0.760918 
ax = 9.647861, ay = -1.198804, az = 0.811167 
ax = 9.626325, ay = -1.112662, az = 0.854238 
ax[1 
# RECV ASCII> 
30] = 9.647861, ay = -1.112662, az = 0.717847 
ax = 9.626325, ay = -1.083949, az = 0.825524 
ax = 9.640682, ay = -1.098306, az = 0.782453 
ax = 9.662217, ay = -1.170090, az = 0.796810 
ax = 9.683753, ay = -1.119841, az = 0.753739 
ax = 9.619146, ay = -1.148555, az = 0.782453 
ax = 9.698110, ay = -1.112662, az = 0.782453 
ax = 9.647861, ay = -1.184447, az = 0.739382 
ax = 9.640682, ay  
# RECV ASCII> 
= -1.191626, az = 0.818345 
ax = 9.662217, ay = -1.205983, az = 0.796810 
ax = 9.647861, ay = -1.062413, az = 0.847059 
ax = 9.604790, ay = -1.162912, az = 0.861416 
ax = 9.626325, ay = -1.076770, az = 0.875773 
ax = 9.690931, ay = -1.134198, az = 0.897308 
ax = 9.662217, ay = -1.148555, az = 0.796810 
ax = 9.561719, ay = -1.127019, az = 0.732204 
ax = 9.655039, ay = -1.148555, az = 0 
# RECV ASCII> 
.825524 
ax = 9.633504, ay = -1.170090, az = 0.768096 
ax = 9.619146, ay = -1.162912, az = 0.768096 
ax = 9.777073, ay = -1.091127, az = 0.753739 
ax = 9.719646, ay = -1.220340, az = 0.689133 
ax = 9.633504, ay = -1.249053, az = 0.811167 
ax = 9.597611, ay = -1.148555, az = 0.789631 
ax = 9.662217, ay = -1.083949, az = 0.760918 
ax = 9.698110, ay = -1.069592, az = 0.753739 
ax = 9.633 
# RECV ASCII> 
504, ay = -1.033699, az = 0.746561 
ax = 9.647861, ay = -1.134198, az = 0.818345 
ax = 9.597611, ay = -1.213161, az = 0.861416 
ax = 9.690931, ay = -1.205983, az = 0.746561 
ax = 9.698110, ay = -1.155733, az = 0.710668 
ax = 9.683753, ay = -1.170090, az = 0.760918 
ax = 9.576076, ay = -1.234696, az = 0.847059 
ax = 9.439685, ay = -1.119841, az = 1.040878 
ax = 9.712466, ay = -1.170090 
# RECV ASCII> 
, az = 0.904487 
ax = 9.820145, ay = -0.839881, az = 0.739382 
ax = 9.913465, ay = -1.249053, az = 0.602991 
ax = 9.619146, ay = -1.263410, az = 0.818345 
ax = 9.812965, ay = -1.213161, az = 0.760918 
ax = 9.611968, ay = -1.363909, az = 0.811167 
ax = 9.360722, ay = -1.069592, az = 1.134198 
ax = 9.554541, ay = -0.983450, az = 0.868595 
ax = 9.604790, ay = -0.696311, az = 0.904487 
ax 
# RECV ASCII> 
= 9.726824, ay = -0.983450, az = 0.725025 
ax = 9.748359, ay = -1.162912, az = 0.653241 
ax = 9.382257, ay = -1.162912, az = 0.847059 
ax = 9.174082, ay = -1.277767, az = 0.725025 
ax = 9.963714, ay = -1.263410, az = 0.423530 
ax = 9.698110, ay = -1.263410, az = 0.732204 
ax = 9.655039, ay = -1.256232, az = 0.638884 
ax = 9.611968, ay = -1.191626, az = 0.624527 
ax = 9.669396, ay[180 
# RECV ASCII> 
] = -1.213161, az = 0.545564 
ax = 9.970891, ay = -1.263410, az = 0.423530 
ax = 9.798608, ay = -1.270589, az = 0.301496 
ax = 9.791430, ay = -1.342373, az = 0.344566 
ax = 9.985249, ay = -1.406980, az = 0.107677 
ax = 9.734002, ay = -1.579263, az = 0.667597 
ax = 9.827322, ay = -1.586441, az = 0.344566 
ax = 9.439685, ay = -1.529014, az = 0.373280

littleshrimp 发表于 2019-11-22 12:24

duguyining 发表于 2019-11-22 11:27
不对，只有一百多个数据。

# RECV ASCII>
I2C communication successd!!!
...

也是LIS25BA吗

duguyining 发表于 2019-11-22 13:02

不是是LSM9DS1

littleshrimp 发表于 2019-11-22 13:23

duguyining 发表于 2019-11-22 13:02
不是是LSM9DS1

你用的中断还是轮询？

duguyining 发表于 2019-11-22 13:28

轮询模式

littleshrimp 发表于 2019-11-22 14:03

duguyining 发表于 2019-11-22 13:28
轮询模式

把代码拿出来看下
是先读状态寄存器判断后再读加速度数据？
I2C通信速率多少？

duguyining 发表于 2019-11-22 14:14

这是I2C配置代码：

   

void MX_I2C1_Init(void) 
{

  hi2c1.Instance = I2C1; 
  hi2c1.Init.Timing = 0x00501E6C; 
  hi2c1.Init.OwnAddress1 = 0; 
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; 
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; 
  hi2c1.Init.OwnAddress2 = 0; 
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK; 
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; 
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; 
  if (HAL_I2C_Init(&hi2c1) != HAL_OK) 
  { 
    Error_Handler(); 
  } 
  /** Configure Analogue filter  
  */ 
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK) 
  { 
    Error_Handler(); 
  } 
  /** Configure Digital filter  
  */ 
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK) 
  { 
    Error_Handler(); 
  }

}

void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle) 
{

  GPIO_InitTypeDef GPIO_InitStruct = {0}; 
  if(i2cHandle->Instance==I2C1) 
  { 
  /* USER CODE BEGIN I2C1_MspInit 0 */

  /* USER CODE END I2C1_MspInit 0 */ 
   
    __HAL_RCC_GPIOB_CLK_ENABLE(); 
    /**I2C1 GPIO Configuration     
    PB8     ------> I2C1_SCL 
    PB9     ------> I2C1_SDA  
    */ 
    /* I2C1 clock enable */ 
    __HAL_RCC_I2C1_CLK_ENABLE(); 
    GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9; 
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; 
    GPIO_InitStruct.Pull = GPIO_PULLUP; 
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; 
    GPIO_InitStruct.Alternate = GPIO_AF4_I2C1; 
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* USER CODE BEGIN I2C1_MspInit 1 */

  /* USER CODE END I2C1_MspInit 1 */ 
  } 
}

这是读取数据的代码：

    lsm9ds1_dev_reset_set(&dev_ctx_mag, &dev_ctx_imu, PROPERTY_ENABLE); 
    do 
    { 
        lsm9ds1_dev_reset_get(&dev_ctx_mag, &dev_ctx_imu, &rst); 
    } while (rst);

    //    Enable Block Data Update 
    lsm9ds1_block_data_update_set(&dev_ctx_mag, &dev_ctx_imu, PROPERTY_ENABLE);

    //    Set full scale 
    lsm9ds1_xl_full_scale_set(&dev_ctx_imu, LSM9DS1_16g);

    //    Set Output Data Rate / Power mode 
    lsm9ds1_imu_data_rate_set(&dev_ctx_imu, LSM9DS1_IMU_952Hz);

while (1)

{

            lsm9ds1_dev_status_get(&dev_ctx_mag, &dev_ctx_imu, &reg);

            if (reg.status_imu.xlda) 
            { 
                //Read device status register 
                lsm9ds1_acceleration_raw_get(&dev_ctx_imu, data_raw_acceleration.u8bit);

                acceleration_g = lsm9ds1_from_fs16g_to_g(data_raw_acceleration.i16bit); 
                acceleration_g = lsm9ds1_from_fs16g_to_g(data_raw_acceleration.i16bit); 
                acceleration_g = lsm9ds1_from_fs16g_to_g(data_raw_acceleration.i16bit);

}

littleshrimp 发表于 2019-11-22 17:12

duguyining 发表于 2019-11-22 14:14
这是I2C配置代码：

   

void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
& ...

检查一下你配置的I2C速率看能不能满足要求

参考下边代码中加速度的配置

https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/lsm9ds1_STdC/example/read_data_simple.c

不行使用中断方式看看

duguyining 发表于 2019-12-10 11:30

<img src="file:///C:\Users\Administrator\AppData\Roaming\Tencent\Users\1778619618\QQ\WinTemp\RichOle\EOF8]K0KZD63KFAXYR77V_A.png" />请问一下 0.01 µA w/o RTC和 0.20 µA w/ RTC是什么意思

duguyining 发表于 2019-12-10 11:32

功耗0.01 µA w/o RTC和 0.20 µA w/ RTC是什么意思

littleshrimp 发表于 2019-12-10 12:06

duguyining 发表于 2019-12-10 11:32
功耗0.01 µA w/o RTC和 0.20 µA w/ RTC是什么意思

在哪看到的？

duguyining 发表于 2019-12-10 13:14

littleshrimp 发表于 2019-12-10 13:35

duguyining 发表于 2019-12-10 13:14

单片机吗在哪个文档看到的？

duguyining 发表于 2019-12-10 14:01

芯片手册

littleshrimp 发表于 2019-12-10 17:17

duguyining 发表于 2019-12-10 14:01
芯片手册

看到了，这个我也不是很确定，建议你去STM32版块发贴提问

cruelfox 发表于 2019-12-11 10:32

duguyining 发表于 2019-12-10 11:32
功耗0.01 µA w/o RTC和 0.20 µA w/ RTC是什么意思

w/o 是 without 缩写

w/ 是  with  缩写

一个是不用RTC的功耗，一个是用了RTC的功耗。注意，RTC不包括32k晶振的振荡电路。

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