Foreword
这周选错传感器了，把 LPS22HB 选成 LPS22HH 了，文档白写了😫
就来更个 CSDN 吧，不然亏大了。
LPS22HB 和 LPS22HH 的异同
先讲讲他们的异同点吧
相同点
- 地址是一样的（所以我看着 HH 的文档跑通了 HB 的传感器……）
- 基础配置以及数据寄存器地址一样（FIFO 以及 Interrupt 功能位不一致）
- 读取的数据都是气压和温度，位数一样
- 气压测量范围一样
- 都支持 SPI 和 I2C 通讯
- 都支持 FIFO 和 Interrupt
- 都支持设置参考气压值
不同点
- WHO_AM_I 不一样，差了一位（发现 WHO_AM_I 对不上的时候我竟然觉得是文档写错了😑）
- LPS22HH 支持 I3C 通讯
- LPS22HH 支持更高的采样频率
- LPS22HH 内部 FIFO 更大，FIFO 模式有区别
- LPS22HH 有专门的 FIFO 数据读取寄存器
LPS22HH 压力传感器
主控芯片：MM32F3277
传感器：LPS22HH 压力传感器
通讯方式：I2C
开发环境：IAR 7.80.4
Features
- Embedded temperature compensation
- 24-bit pressure data output
- SPI, I2C or MIPI I3C interfaces
- Embedded FIFO
- Interrupt functions: Data-Ready, FIFO flags, pressure thresholds
Applications
- Altimeters and barometers for portable devices
- GPS applications
- Weather station equipment
- Sport watches
- e-cigarettes
- Drones
- Gas metering
Pin
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VDD_IO: Power Supply
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SCL / SPC: SCL for I2C and I3C serial clock; SPC for SPI serial port clock
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RES: Connected to GND
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SDA / SDI / SDI or SDO: SDA for I2C and I3C serial data; SDI for 4-wire SPI serial data input; SDI or SDO for 3-wire SPI serial data input or output
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SA0 / SDO: SA0 for I2C and I3C LSB address; SDO for 4-wire SPI serial data output
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CS: interface selection 0 for SPI; 1 for I2C / I3C
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INT_DRDY: Interrupt or Data-Ready; Floating(Internal pull-down) for I2C and I3C; VDD_IO for I3C only
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GND
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GND
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VDD
在 MB-018 中，LPS22HH 连接 I2C，CS 接 VDD，SA0 接地 LSB = 0，INT_DRDY floating，I3C_DISABLE 置 1
LPS22HH Address
SA0 管脚决定了地址 LSB 位的高低，这样主控就可以连两个 LPS22HH 传感器，从地址不会冲突
// LPS22HB Address
#define SLAVE_ADDRESS_SA0 0x00
#define SLAVE_ADDRESS (0x5C | SLAVE_ADDRESS_SA0) // 0x5C
#define SLAVE_ADDRESS_WRITE SLAVE_ADDRESS << 1 // 0xB8
#define SLAVE_ADDRESS_READ (SLAVE_ADDRESS << 1) | 0x01 // 0xB9
I2C 对 LPS22HH 进行读写
I2C 读写方式及原理可见「Rose Island」MM32F3277 I2C 访问 HTS221 温湿度传感器
Master write data to Slave
Steps：
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Master 发送 START 信号（SCL hold high, SDA high to low）
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Master 发送 Slave 的 7 位地址 + 写信号
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Slave 进行地址匹配，匹配成功回应 SAK
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Master 发送 SubAddress，即 Slave 内部寄存器地址
通过
CTRL_REG2中的IF_ADD_INC位决定 SubAddr 地址是否自增，即是否可以连续操作多个寄存器，该位默认为高#define LPS22HH_CTRL_REG1 0x10 LPS22HH_Reg_Write(I2Cx, LPS22HH_CTRL_REG1, buffer, 1) -
Slave 应答 SubAddr
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Master 发送 DATA，Slave 应答 SAK
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Master 发送完后，产生 STOP 信号（SCL hold high, SDA low to high）
Master read data from Slave
Steps：
- Master 发送 START 信号（SCL hold high, SDA high to low）
- Master 发送 Slave 的 7 位地址 + 写信号
- Slave 进行地址匹配，匹配成功回应 SAK
- Master 发送 SubAddress，即 Slave 内部寄存器地址，操作同上
- Slave 应答 SubAddr
- Master 发送 RESTART 信号，重新发送 Slave 的 7 位地址 + 读信号，Slave 回应 SAK
- Slave 发送 Data，Master 应答 MAK
- Master 接收最后一个数据后，不应答 NMAK，产生 STOP 信号（SCL hold high, SDA lowto high）
Calculation Function
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Pressure Calculation
从以下三个寄存器中读取压力数据：
PRESS_OUT_H/PRESS_OUT_L/PRESS_OUT_XL;如果用了传感器内部 FIFO，则读
FIFO_DATA_OUT_PRESS_H/FIFO_DATA_OUT_PRESS_L/FIFO_DATA_OUT_PRESS_XL
P r e s s u r e ( h P a ) = ( P R E S S _ O U T _ H < < 16 ) ?? & ?? ( P R E S S _ O U T _ L < < 8 ) ?? & ?? ( P R E S S _ O U T _ X L ) 4096 Pressure(hPa) = \frac{(PRESS\_OUT\_H << 16)\ \ \&\ \ (PRESS\_OUT\_L << 8)\ \ \&\ \ (PRESS\_OUT\_XL)}{4096} Pressure(hPa)=4096(PRESS_OUT_H<<16)??&??(PRESS_OUT_L<<8)??&??(PRESS_OUT_XL)? -
Temperature Calculation
从以下两个寄存器中读取压力数据：
TEMP_OUT_H/TEMP_OUT_L;如果用了传感器内部 FIFO，则读
FIFO_DATA_OUT_TEMP_H/FIFO_DATA_OUT_TEMP_L
T e m p e r a t u r e ( d e g C ) = ( T E M P _ O U T _ H < < 8 ) ?? & ?? ( T E M P _ O U T _ L ) 100 Temperature(degC)=\frac{(TEMP\_OUT\_H << 8)\ \ \&\ \ (TEMP\_OUT\_L)}{100} Temperature(degC)=100(TEMP_OUT_H<<8)??&??(TEMP_OUT_L)?
Embedded FIFO
128 个 40 位数据 FIFO 用于存储压力和温度值，在主控需要读取时唤醒传感器，从 FIFO 取出数据。启用 FIFO 后依旧可以从标准寄存器中读取数据。
6 种模式：
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Bypass mode
FIFO 未启用。如果需要切换 FIFO mode，需要先设置为 Bypass mode，再设置新的 FIFO mode。
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FIFO mode
启用 FIFO，数据会存入 FIFO 直到 FIFO 满。FIFO 默认深度是 128，用户可以通过配置
FIFO_WTM[6:0]设定 FIFO 深度。FIFO 满后，需要切换回 Bypass mode 再重启 FIFO mode。
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Continuous (Dynamic-Stream) mode
启用 FIFO，环形队列。新的数据样本会放入 FIFO 触发读取。这种方式用于当数据读取周期不能满足 1/ODR 的时候。
同时也可以使用
INT_F_WTM中断，当 FIFO 满的时候，下一个数据触发读取 FIFO，FIFO 清空重新装数据。 -
Bypass to FIFO mode
使用该模式需要启用中断。根据中断状态
INT_SOURCE中的IA决定 mode，IA= 0 时为 Bypass mode，IA= 1 时为 FIFO mode。 -
Bypass to Continuous (Dynamic-Stream) mode
使用该模式需要启用中断。根据中断状态
INT_SOURCE中的IA决定 mode，IA= 0 时为 Bypass mode，IA= 1 时为 Continuous (Dynamic-Stream) mode。 -
Continuous (Dynamic-Stream) to FIFO mode
使用该模式需要启用中断。根据中断状态
INT_SOURCE中的IA决定 mode，IA= 0 时为 Continuous (Dynamic-Stream) mode，IA= 1 时为 FIFO mode。
Register Map
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INTERRUPT_CFG
Reg Address is 0x0B, R/W and default is 0x00
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PHE: 当气压比设定的标准线高时产生中断，标准线由用户定义，存储在THS_P寄存器中 -
PLE: 当气压比设定的标准线低时产生中断，标准线由用户定义，存储在THS_P寄存器中 -
LIR: 是否锁存中断请求至INT_SOURCE寄存器 -
DIFF_EN: 中断使能 -
RESET_AZ: Reset AUTOZERO function -
AUTOZERO: Enable AUTOZERO functionAUTOZERO置 1 后，读取的数据会作为参考值存入REF_P寄存器，之后该位自动清 0，如果要取消该参考值，需要对RESET_AZ位置 1P_DIFF_IN = measured pressure - REF_P (该值用于产生中断)
PRESS_OUT = measured pressure - REF_P
如果使用了
AUTOZERO，PHE比较的是 P_DIFF_IN 和THS_P -
RESET_ARP: Reset AUTOREFP function -
AUTOREFP: Enable AUTOREFP functionAUTOREFP置 1 后，读取的数据会作为参考值存入REF_P寄存器，之后该位自动清 0，如果要取消该参考值，需要对RESET_ARP位置 1与
AUTOZERO不同的是，PRESS_OUT输出的是测量值，而不是与参考值的差值P_DIFF_IN = measured pressure - REF_P (该值用于产生中断)
PRESS_OUT = measured pressure
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**THS_P_L / THS_P_H **
Reg Address is 0x0C and 0x0D, R/W and default is 0x00
该 15 位的值用于和测量出的压力数据进行比较，产生中断。
若要产生中断，需要将
INTERRUPT_CFG中DIFF_EN/PHE/PLE位使能THS_P(15-bit unsigned) = Desired interrupt threshold(hPa) × 16
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IF_CTRL
Reg Address is 0x0E, R/W and default is 0x00
I2C_DISABLE: Set 0 to enable I2C; Set 1 to disable I2CI3C_DISABLE: Set 0 to enable I3C; Set 1 to disable I3CPD_DIS_INT1: 置 0 时 INT1 管脚下拉；置 1 时 INT1 管脚不下拉SDO_PU_EN: 置 0 时 SDO 管脚不上拉；置 1 时 SDO 管脚上拉SDA_PU_EN: 置 0 时 SDA 管脚不上拉；置 1 时 SDA 管脚上拉INT_EN_I3C: 置 0 时 INT1 管脚不使能 I3C；置 0 时 INT1 管脚使能 I3C
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WHO_AM_I
Reg Address is 0x0F, read only and default is 0xB3
// LPS22HH Device ID #define DEVICE_ID_WHO_AM_I 0xB3 -
CTRL_REG1
Reg Address is 0x10, R/W and default is 0x00
SIM: 置 0 为 4 线 SPI；置 1 为 3 线 SPIBDU: 置 0 为连续更新 MSB 和 LSB 的数据；置 1 为只有当 MSB 和 LSB 都被读取了之后再更新数据，建议置 1LPFP_CFG: 如果低通滤波器未使能，bandwith = ODR / 2；如果低通滤波器使能且该位为 0，bandwith = ODR / 9；如果低通滤波器使能且该位为 1，bandwith = ODR / 20EN_LPFP: 是否使能低通滤波器ODR: 0x00 为 one-shot 模式，设备为 Power-down mode，配合CFGR_REG2中的ONE_SHOT位触发一次读取；其他情况下设备为 Continuous mode，根据频率连续读取数据
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CTRL_REG2
Reg Address is 0x11, R/W and default is 0x00
ONE_SHOT: 触发 One_Shot，CFGR_REG1中的ODR位需要是 0x00，硬件清零LOW_NOISE_EN: 置 0 为 low-current 模式；置 1 为 low-noise 模式，此时 ODR < 100HzSWRESET: 置 1 为软件重启，硬件清零IF_ADD_INC: I2C / SPI 模式下操作寄存器时，地址自增PP_OD: interrupt 管脚配置，置 0 为推挽输出；置 1 为开漏输出INT_H_L: 置 0 为 interrupt 高有效；置 1 为低有效BOOT: 置 1 为 reboot，硬件清零
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CTRL_REG3
Reg Address is 0x12, R/W and default is 0x00
INT_S: INT_DRDY 管脚输出，00 为 Data Signal，01 为 Pressure high 中断，10 为 Pressure Low 中断，11 为 Pressure High or Low 中断DRDY: INT_DRDY 管脚输出 Data ready signalINT_F_OVR: INT_DRDY 管脚输出 FIFO overrun statusINT_F_WTM: INT_DRDY 管脚输出 FIFO threshold statusINT_F_FULL: INT_DRDY 管脚输出 FIFO full flag
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FIFO_CTRL
Reg Address is 0x13, R/W and default is 0x00
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F_MODE/TRIG_MODESTRIG_MODES F_MODE MODE X 00 Bypass mode 0 01 FIFO mode 0 1X Continuous (Dynamic-Stream) mode 1 01 Bypass to FIFO mode 1 10 Bypass to Continuous (Dynamic-Stream) mode 1 11 Continuous (Dynamic-Stream) to FIFO mode -
STOP_ON_WTM: 如果设置了FIFO_WTM的WTM位，FIFO 中的数量到达 watermark level 的时候，FIFO 为满
-
-
FIFO_WTMReg Address is 0x14, R/W and default is 0x00
WTM为 FIFO watermark level -
REF_P_L/REF_P_HReg Address is 0x15 / 0x16, read only and default is 0x00
当
INTERRUPT_CFG中AUTOZERO和AUTOREFP使能时，需要用到参考气压值 -
RPDS_L/RPDS_HReg Address is 0x18 / 0x19, read only and default is 0x00
用于焊接后的压力偏移量校准
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INT_SOURCEReg Address is 0x24, read only and default is 0x00
PH: high differential pressure eventPL: low differential pressure eventIA: one or more interrupt event generatedBOOT_ON: boot phase running
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FIFO_STATUS1Reg Address is 0x25, read only and default is 0x00
FSS: 0x00 为 FIFO 空；0x80 为 FIFO满 -
FIFO_STATUS2Reg Address is 0x26, read only and default is 0x00
FIFO_FULL_IA: FIFO 满但未溢出FIFO_OVR_IA: FIFO 满且溢出FIFO_WTM_IA: FIFO 大于等于 watermark level
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STATUSReg Address is 0x27, read only and default is 0x00
跟着
ODR频率更新P_DA: 有新的压力数据了T_DA: 有新的温度数据了P_OR: 压力数据溢出，旧的数据被替换T_OR: 温度数据溢出，旧的数据被替换
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PRESS_OUT_XL/PRESS_OUT_L/PRESS_OUT_HReg Address is 0x28 / 0x29 / 0x2A , read only and default is 0x00
输出的是与
RPDS的差值 -
TEMP_OUT_L/TEMP_OUT_HReg Address is 0x2B / 0x2C , read only and default is 0x00
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FIFO_DATA_OUT_PRESS_XL/FIFO_DATA_OUT_PRESS_L/FIFO_DATA_OUT_PRESS_HReg Address is 0x78 / 0x79 / 0x7A , read only and default is 0x00
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FIFO_DATA_OUT_TEMP_L/FIFO_DATA_OUT_TEMP_HReg Address is 0x7B / 0x7C , read only and default is 0x00
Code
实现 LPS22HH 数据读取
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lps22hh.h
#ifndef __LPS22HH_H_ #define __LPS22HH_H_ typedef enum { LPS22HH_OK = (uint8_t)0, LPS22HH_ERROR = !LPS22HH_OK } LPS22HH_Error_Typedef; typedef enum { LPS22HH_DISABLE = (uint8_t)0, LPS22HH_ENABLE = !LPS22HH_DISABLE } LPS22HH_State_Typedef; /// @defgroup HPS22HH Interrupts Definition /// @{ #define LPS22HH_IT_PHE 0x01 #define LPS22HH_IT_PLE 0x02 /// @} /// @defgroup HPS22HH Interrupt Mode Definition /// @{ #define LPS22HH_IT_MODE_RESETAZ 0x10 #define LPS22HH_IT_MODE_AUTOZERO 0x20 #define LPS22HH_IT_MODE_RESETARP 0x40 #define LPS22HH_IT_MODE_AUTOREFP 0x80 /// @} /// @defgroup LPS22HH Statusflags definition /// @{ #define LPS22HH_ITS_PH_FLAG 0x01 #define LPS22HH_ITS_PL_FLAG 0x02 #define LPS22HH_ITS_IA_FLAG 0x04 /// @} /// @defgroup LPS22HH Output data rate /// @{ #define LPS22HH_OUTPUT_DATA_ONESHOT 0x00 #define LPS22HH_OUTPUT_DATA_RATE_1 0x01 #define LPS22HH_OUTPUT_DATA_RATE_10 0x02 #define LPS22HH_OUTPUT_DATA_RATE_25 0x03 #define LPS22HH_OUTPUT_DATA_RATE_50 0x04 #define LPS22HH_OUTPUT_DATA_RATE_75 0x05 #define LPS22HH_OUTPUT_DATA_RATE_100 0x06 #define LPS22HH_OUTPUT_DATA_RATE_200 0x07 /// @} /// @defgroup LPS22HH FIFO mode /// @{ #define LPS22HH_FIFO_MODE_BYPASS 0x00 #define LPS22HH_FIFO_MODE_FIFO 0x01 #define LPS22HH_FIFO_MODE_CONTINUOUS 0x02 #define LPS22HH_FIFO_MODE_BYPASS_2_FIFO 0x05 #define LPS22HH_FIFO_MODE_BYPASS_2_CONTINUOUS 0x06 #define LPS22HH_FIFO_MODE_CONTINUOUS_2_FIFO 0x07 /// @} #ifdef _LPS22HH_C_ // LPS22HH register subAddr #define LPS22HH_INTERRUPT_CFG 0x0B // Interrupt register #define LPS22HH_THS_P_L 0x0C // Pressure threshold registers #define LPS22HH_THS_P_H 0x0D // Pressure threshold registers #define LPS22HH_IF_CTRL 0x0E // Interface control register #define LPS22HH_WHO_AM_I 0x0F // Who am I #define LPS22HH_CTRL_REG1 0x10 // Control registers #define LPS22HH_CTRL_REG2 0x11 // Control registers #define LPS22HH_CTRL_REG3 0x12 // Control registers #define LPS22HH_FIFO_CTRL 0x13 // FIFO configuration register #define LPS22HH_FIFO_WTM 0x14 // FIFO watermark level #define LPS22HH_REF_P_L 0x15 // Reference pressure registers #define LPS22HH_REF_P_H 0x16 // Reference pressure registers #define LPS22HH_RPDS_L 0x18 // Pressure offset registers #define LPS22HH_RPDS_H 0x19 // Pressure offset registers #define LPS22HH_INT_SOURCE 0x24 // Interrupt register #define LPS22HH_FIFO_STATUS1 0x25 // FIFO status registers #define LPS22HH_FIFO_STATUS2 0x26 // FIFO status registers #define LPS22HH_STATUS 0x27 // Status register #define LPS22HH_PRESS_OUT_XL 0x28 // Pressure output registers #define LPS22HH_PRESS_OUT_L 0x29 // Pressure output registers #define LPS22HH_PRESS_OUT_H 0x2A // Pressure output registers #define LPS22HH_TEMP_OUT_L 0x2B // Temperature output registers #define LPS22HH_TEMP_OUT_H 0x2C // Temperature output registers #define LPS22HH_FIFO_DATA_OUT_PRESS_XL 0x78 // FIFO pressure output registers #define LPS22HH_FIFO_DATA_OUT_PRESS_L 0x79 // FIFO pressure output registers #define LPS22HH_FIFO_DATA_OUT_PRESS_H 0x7A // FIFO pressure output registers #define LPS22HH_FIFO_DATA_OUT_TEMP_L 0x7B // FIFO temperature output registers #define LPS22HH_FIFO_DATA_OUT_TEMP_H 0x7C // FIFO temperature output registers // LPS22HH Address #define SLAVE_ADDRESS_SA0 0x00 #define SLAVE_ADDRESS (0x5C | SLAVE_ADDRESS_SA0) // 0x5C #define SLAVE_ADDRESS_WRITE SLAVE_ADDRESS << 1 // 0xB8 #define SLAVE_ADDRESS_READ (SLAVE_ADDRESS << 1) | 0x01 // 0xB9 // LPS22HH Device ID #define DEVICE_ID_WHO_AM_I 0xB3 // LPS22HH_INTERRUPT_CFG #define LPS22HH_ITC_PHE_POS (0) #define LPS22HH_ITC_PHE (0x01 << LPS22HH_ITC_PHE_POS) #define LPS22HH_ITC_PLE_POS (1) #define LPS22HH_ITC_PLE (0x01 << LPS22HH_ITC_PLE_POS) #define LPS22HH_ITC_LIR_POS (2) #define LPS22HH_ITC_LIR (0x01 << LPS22HH_ITC_LIR_POS) #define LPS22HH_ITC_DIFF_EN_POS (3) #define LPS22HH_ITC_DIFF_EN (0x01 << LPS22HH_ITC_DIFF_EN_POS) #define LPS22HH_ITC_RESET_AZ_POS (4) #define LPS22HH_ITC_RESET_AZ (0x01 << LPS22HH_ITC_RESET_AZ_POS) #define LPS22HH_ITC_AUTOZERO_POS (5) #define LPS22HH_ITC_AUTOZERO (0x01 << LPS22HH_ITC_AUTOZERO_POS) #define LPS22HH_ITC_RESET_ARP_POS (6) #define LPS22HH_ITC_RESET_ARP (0x01 << LPS22HH_ITC_RESET_ARP_POS) #define LPS22HH_ITC_AUTOREFP_POS (7) #define LPS22HH_ITC_AUTOREFP (0x01 << LPS22HH_ITC_AUTOREFP_POS) // LPS22HH_IF_CTRL #define LPS22HH_IFC_I2C_DIS_POS (0) #define LPS22HH_IFC_I2C_DIS (0x01 << LPS22HH_IFC_I2C_DIS_POS) #define LPS22HH_IFC_I3C_DIS_POS (1) #define LPS22HH_IFC_I3C_DIS (0x01 << LPS22HH_IFC_I3C_DIS_POS) #define LPS22HH_IFC_PD_DIS_INT_POS (2) #define LPS22HH_IFC_PD_DIS_INT (0x01 << LPS22HH_IFC_PD_DIS_INT_POS) #define LPS22HH_IFC_SDO_PU_EN_POS (3) #define LPS22HH_IFC_SDO_PU_EN (0x01 << LPS22HH_IFC_SDO_PU_EN_POS) #define LPS22HH_IFC_SDA_PU_EN_POS (4) #define LPS22HH_IFC_SDA_PU_EN (0x01 << LPS22HH_IFC_SDA_PU_EN_POS) #define LPS22HH_IFC_INT_EN_I3C_POS (7) #define LPS22HH_IFC_INT_EN_I3C (0x01 << LPS22HH_IFC_INT_EN_I3C_POS) // LPS22HH_CTRL_REG1 #define LPS22HH_CR1_SIM_POS (0) #define LPS22HH_CR1_SIM (0x01U << LPS22HH_CR1_SIM_POS) #define LPS22HH_CR1_BDU_POS (1) #define LPS22HH_CR1_BDU (0x01U << LPS22HH_CR1_BDU_POS) #define LPS22HH_CR1_LPFP_CFG_POS (2) #define LPS22HH_CR1_LPFP_CFG (0x01U << LPS22HH_CR1_LPFP_CFG_POS) #define LPS22HH_CR1_EN_LPFP_POS (3) #define LPS22HH_CR1_EN_LPFP (0x01U << LPS22HH_CR1_EN_LPFP_POS) #define LPS22HH_CR1_ODR_POS (4) #define LPS22HH_CR1_ODR_ONE_SHOT (0x00U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_1 (0x01U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_10 (0x02U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_25 (0x03U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_50 (0x04U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_75 (0x05U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_100 (0x06U << LPS22HH_CR1_ODR_POS) #define LPS22HH_CR1_ODR_200 (0x07U << LPS22HH_CR1_ODR_POS) // LPS22HH_CTRL_REG2 #define LPS22HH_CR2_ONE_SHOT_POS (0) #define LPS22HH_CR2_ONE_SHOT (0x01U << LPS22HH_CR2_ONE_SHOT_POS) #define LPS22HH_CR2_LOW_NOISE_EN_POS (1) #define LPS22HH_CR2_LOW_NOISE_EN (0x01U << LPS22HH_CR2_LOW_NOISE_EN_POS) #define LPS22HH_CR2_SWRESET_POS (2) #define LPS22HH_CR2_SWRESET (0x01U << LPS22HH_CR2_SWRESET_POS) #define LPS22HH_CR2_IF_ADD_INC_POS (4) #define LPS22HH_CR2_IF_ADD_INC (0x01U << LPS22HH_CR2_IF_ADD_INC_POS) #define LPS22HH_CR2_PP_OD_POS (5) #define LPS22HH_CR2_PP_OD (0x01U << LPS22HH_CR2_PP_OD_POS) #define LPS22HH_CR2_INT_H_L_POS (6) #define LPS22HH_CR2_INT_H_L (0x01U << LPS22HH_CR2_INT_H_L_POS) #define LPS22HH_CR2_BOOT_POS (7) #define LPS22HH_CR2_BOOT (0x01U << LPS22HH_CR2_BOOT_POS) // LPS22HH_CTRL_REG3 #define LPS22HH_CR3_INT_S_POS (0) #define LPS22HH_CR3_INT_S_DATA_SIG (0x00U << LPS22HH_CR3_INT_S_POS) #define LPS22HH_CR3_INT_S_PH (0x01U << LPS22HH_CR3_INT_S_POS) #define LPS22HH_CR3_INT_S_PL (0x02U << LPS22HH_CR3_INT_S_POS) #define LPS22HH_CR3_INT_S_PHL (0x03U << LPS22HH_CR3_INT_S_POS) #define LPS22HH_CR3_DRDY_POS (2) #define LPS22HH_CR3_DRDY (0x00U << LPS22HH_CR3_DRDY_POS) #define LPS22HH_CR3_INT_F_OVR_POS (3) #define LPS22HH_CR3_INT_F_OVR (0x01U << LPS22HH_CR3_INT_F_OVR_POS) #define LPS22HH_CR3_INT_F_WTM_POS (4) #define LPS22HH_CR3_INT_F_WTM (0x01U << LPS22HH_CR3_INT_F_WTM_POS) #define LPS22HH_CR3_INT_F_FULL_POS (5) #define LPS22HH_CR3_INT_F_FULL (0x01U << LPS22HH_CR3_INT_F_FULL_POS) // LPS22HH_FIFO_CTRL #define LPS22HH_FC_MODE_POS (0) #define LPS22HH_FC_BYPASS (0x00U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_FIFO (0x01U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_CONTINUOUS (0x02U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_BYPASS_2_FIFO (0x05U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_BYPASS_2_CONTINUOUS (0x06U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_CONTINUOUS_2_FIFO (0x07U << LPS22HH_FC_MODE_POS) #define LPS22HH_FC_STOP_ON_WTM_POS (3) #define LPS22HH_FC_STOP_ON_WTM (0x01 << LPS22HH_FC_STOP_ON_WTM_POS) // LPS22HH_INT_SOURCE #define LPS22HH_ITS_PH_POS (0) #define LPS22HH_ITS_PH (0x01 << LPS22HH_ITS_PH_POS) #define LPS22HH_ITS_PL_POS (1) #define LPS22HH_ITS_PL (0x01 << LPS22HH_ITS_PL_POS) #define LPS22HH_ITS_IA_POS (2) #define LPS22HH_ITS_IA (0x01 << LPS22HH_ITS_IA_POS) // LPS22HH_FIFO_STATUS2 #define LPS22HH_FSTA_FULL_IA_POS (0) #define LPS22HH_FSTA_FULL_IA (0x01 << LPS22HH_FSTA_FULL_IA_POS) #define LPS22HH_FSTA_OVR_IA_POS (1) #define LPS22HH_FSTA_OVR_IA (0x01 << LPS22HH_FSTA_OVR_IA_POS) #define LPS22HH_FSTA_WTM_IA_POS (2) #define LPS22HH_FSTA_WTM_IA (0x01 << LPS22HH_FSTA_WTM_IA_POS) // LPS22HH_STATUS #define LPS22HH_STATUS_P_DA_POS (0) #define LPS22HH_STATUS_P_DA (1 << LPS22HH_STATUS_P_DA_POS) #define LPS22HH_STATUS_T_DA_POS (1) #define LPS22HH_STATUS_T_DA (1 << LPS22HH_STATUS_T_DA_POS) #define LPS22HH_STATUS_P_OR_POS (4) #define LPS22HH_STATUS_P_OR (1 << LPS22HH_STATUS_P_OR_POS) #define LPS22HH_STATUS_T_OR_POS (5) #define LPS22HH_STATUS_T_OR (1 << LPS22HH_STATUS_T_OR_POS) #endif LPS22HH_Error_Typedef LPS22HH_Reg_Write(I2C_TypeDef *I2Cx, u8 regAddr, u8* ptr, u16 cnt); LPS22HH_Error_Typedef LPS22HH_Reg_Read(I2C_TypeDef *I2Cx, u8 regAddr, u8* ptr, u16 cnt); u8 LPS22HH_WHO_AM_I_Get(I2C_TypeDef *I2Cx); LPS22HH_Error_Typedef LPS22HH_Software_Reset(I2C_TypeDef *I2Cx); LPS22HH_Error_Typedef LPS22HH_Init(I2C_TypeDef *I2Cx, bool oneshot, u8 frequency); LPS22HH_Error_Typedef LPS22HH_DeInit(I2C_TypeDef *I2Cx); LPS22HH_Error_Typedef LPS22HH_PRESS_OUT_Get(I2C_TypeDef *I2Cx, int32_t *P_OUT); LPS22HH_Error_Typedef LPS22HH_TEMP_OUT_Get(I2C_TypeDef *I2Cx, int16_t *T_OUT); LPS22HH_Error_Typedef LPS22HH_Pressure_Calculation(I2C_TypeDef *I2Cx, int32_t *value); LPS22HH_Error_Typedef LPS22HH_Temperature_Calculation(I2C_TypeDef *I2Cx, int16_t *value); LPS22HH_Error_Typedef LPS22HH_Calculation(I2C_TypeDef *I2Cx, int32_t *p_value, int16_t *t_value, bool oneshot); void LPS22HH_Altitude_Calculation(int32_t *p_value); #endif -
lps22hh.c
LPS22HH_Error_Typedef LPS22HH_Reg_Write(I2C_TypeDef *I2Cx, u8 regAddr, u8* ptr, u16 cnt) { Sensor_Write(I2Cx, SLAVE_ADDRESS_WRITE, regAddr, ptr, cnt); return LPS22HH_OK; } LPS22HH_Error_Typedef LPS22HH_Reg_Read(I2C_TypeDef *I2Cx, u8 regAddr, u8* ptr, u16 cnt) { Sensor_Read(I2Cx, SLAVE_ADDRESS_READ, regAddr, ptr, cnt); return LPS22HH_OK; } u8 LPS22HH_WHO_AM_I_Get(I2C_TypeDef *I2Cx) { u8 device_id; if(LPS22HH_Reg_Read(I2Cx, LPS22HH_WHO_AM_I, &device_id, 1)) return LPS22HH_ERROR; return device_id; } LPS22HH_Error_Typedef LPS22HH_Software_Reset(I2C_TypeDef *I2Cx) { u8 swreset = 0x04; if(LPS22HH_Reg_Read(I2Cx, LPS22HH_CTRL_REG2, &swreset, 1)) return LPS22HH_ERROR; return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_Init(I2C_TypeDef *I2Cx, bool oneshot, u8 frequency) { u8 buffer[3] = {0, 0, 0}; if(LPS22HH_WHO_AM_I_Get(I2Cx) == DEVICE_ID_WHO_AM_I){ buffer[0] = LPS22HH_IFC_I3C_DIS; // Disable I3C in IF_CTRL if(LPS22HH_Reg_Write(I2Cx, LPS22HH_IF_CTRL, buffer, 1)) return LPS22HH_ERROR; if(oneshot){ buffer[0] = LPS22HH_CR1_BDU | LPS22HH_CR1_ODR_ONE_SHOT; // Set BDU and ODR in CTRL_REG1 }else{ buffer[0] = LPS22HH_CR1_BDU | (frequency << LPS22HH_CR1_ODR_POS); // Set BDU and ODR in CTRL_REG1 } buffer[1] = LPS22HH_CR2_IF_ADD_INC; // Set ONESHOT and AUTOINC in CTRL_REG1 buffer[2] = 0x00; // Clear CTRL_REG3 if(LPS22HH_Reg_Write(I2Cx, LPS22HH_CTRL_REG1, buffer, 3)) return LPS22HH_ERROR; return LPS22HH_OK; }else{ return LPS22HH_ERROR; } } // LPS22HH_Error_Typedef LPS22HH_DeInit(I2C_TypeDef *I2Cx) { u8 buffer[4] = {0, 0, 0, 0}; if(LPS22HH_Reg_Write(I2Cx, LPS22HH_CTRL_REG1, buffer, 3)) return LPS22HH_ERROR; return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_PRESS_OUT_Get(I2C_TypeDef *I2Cx, int32_t *P_OUT) { uint8_t buffer[3] = {0, 0, 0}; // read from standard registers if(LPS22HH_Reg_Read(I2Cx, LPS22HH_PRESS_OUT_XL, buffer, 3)) return LPS22HH_ERROR; *P_OUT = (buffer[2] << 16) | (buffer[1] << 8) | buffer[0]; return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_TEMP_OUT_Get(I2C_TypeDef *I2Cx, int16_t *T_OUT) { uint8_t buffer[2] = {0, 0}; // read from normal registers if(LPS22HH_Reg_Read(I2Cx, LPS22HH_TEMP_OUT_L, buffer, 2)) return LPS22HH_ERROR; *T_OUT = (buffer[1] << 8) | buffer[0]; return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_Pressure_Calculation(I2C_TypeDef *I2Cx, int32_t *value) { int32_t P_OUT = 0x00; if(LPS22HH_PRESS_OUT_Get(I2Cx, &P_OUT)) return LPS22HH_ERROR; *value = (P_OUT * 10) / 4096; printf("Get Pressure value : %d.%d hPa \n", *value / 10, abs(*value % 10)); return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_Temperature_Calculation(I2C_TypeDef *I2Cx, int16_t *value) { int16_t T_OUT = 0x00; if(LPS22HH_TEMP_OUT_Get(I2Cx, &T_OUT)) return LPS22HH_ERROR; *value = T_OUT / 10; printf("Get Temperature value : %d.%d C \n", *value / 10, abs(*value % 10)); return LPS22HH_OK; } // LPS22HH_Error_Typedef LPS22HH_Calculation(I2C_TypeDef *I2Cx, int32_t *p_value, int16_t *t_value, bool oneshot) { if(oneshot){ uint8_t tmp = 0x00; if(LPS22HB_Reg_Read(I2Cx, LPS22HB_CTRL_REG2, &tmp, 1)) return LPS22HB_ERROR; tmp |= LPS22HB_CR2_ONE_SHOT; if(LPS22HB_Reg_Write(I2Cx, LPS22HB_CTRL_REG2, &tmp, 1)) return LPS22HB_ERROR; } u8 buffer = 0x00; if(LPS22HH_Reg_Read(I2Cx, LPS22HH_STATUS, &buffer, 1)) return LPS22HH_ERROR; if(buffer && LPS22HH_STATUS_P_DA != 0){ LPS22HH_Pressure_Calculation(I2Cx, p_value, fifo); LPS22HH_Altitude_Calculation(p_value); } if(buffer && LPS22HH_STATUS_T_DA != 0){ LPS22HH_Temperature_Calculation(I2Cx, t_value, fifo); } return LPS22HH_OK; } // void LPS22HH_Altitude_Calculation(int32_t *p_value) { float altitude = 44300 * (1 - pow(*p_value / 10132.5, 0.19)); printf("Get Altitude value : %.1f M \n", altitude); }
也可参考 ST 的 LPS22HH 使用代码STM32DUINO/LPS22HH
The End
看到一句话，感觉很棒：
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读书，读书破万卷
P.S. 最近疫情严重，开始琢磨在家重蔬菜，生菜水培就是长得有点儿慢
