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I2C Tool 安装及使用 For i.MX8

关键字 :NXPI2C Tooli.MX8
下载源码
 
1. 获取源码
wget https://mirrors.edge.kernel.org/pub/software/utils/i2c-tools/i2c-tools-4.1.tar.xz
2. 解压源码
tar xvf i2c-tools-4.1.tar.xz cd i2c-tools-4.1
 
Linux 系统

1. 编译生成
make sudo make install
 2. 在 tool 目录下生成如下文件
 
 
Android 系统
 
1. 复制源码到 Android 的 external 目录下
2. 在 i2c-tools-4.1 下新建 Android.mk 文件,内容如下
    LOCAL_PATH:= $(call my-dir)
     
    include $(CLEAR_VARS)
     
    LOCAL_MODULE_TAGS := optional
    LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
    LOCAL_SRC_FILES := tools/i2cbusses.c tools/util.c
    LOCAL_MODULE := i2c-tools
    include $(BUILD_STATIC_LIBRARY)
     
    include $(CLEAR_VARS)
     
    LOCAL_MODULE_TAGS := optional
    LOCAL_SRC_FILES:=tools/i2cdetect.c
    LOCAL_MODULE:=i2cdetect
    LOCAL_CPPFLAGS += -DANDROID
    LOCAL_SHARED_LIBRARIES:=libc
    LOCAL_STATIC_LIBRARIES := i2c-tools
    LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
    include $(BUILD_EXECUTABLE)
     
    include $(CLEAR_VARS)
     
    LOCAL_MODULE_TAGS := optional
    LOCAL_SRC_FILES:=tools/i2cget.c
    LOCAL_MODULE:=i2cget
    LOCAL_CPPFLAGS += -DANDROID
    LOCAL_SHARED_LIBRARIES:=libc
    LOCAL_STATIC_LIBRARIES := i2c-tools
    LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
    include $(BUILD_EXECUTABLE)
     
    include $(CLEAR_VARS)
     
    LOCAL_MODULE_TAGS := optional
    LOCAL_SRC_FILES:=tools/i2cset.c
    LOCAL_MODULE:=i2cset
    LOCAL_CPPFLAGS += -DANDROID
    LOCAL_SHARED_LIBRARIES:=libc
    LOCAL_STATIC_LIBRARIES := i2c-tools
    LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
    include $(BUILD_EXECUTABLE)
     
    include $(CLEAR_VARS)
     
    LOCAL_MODULE_TAGS := optional
    LOCAL_SRC_FILES:=tools/i2cdump.c
    LOCAL_MODULE:=i2cdump
    LOCAL_CPPFLAGS += -DANDROID
    LOCAL_SHARED_LIBRARIES:=libc
    LOCAL_STATIC_LIBRARIES := i2c-tools
    LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
    include $(BUILD_EXECUTABLE)
 3. 执行 
mmm external/i2c-tools-4.1/​
会生成 4 个可执行文件 i2cdetect i2cdump i2cget i2cset
 
 
i2c-tools 的用法
i2cdetect
语法
i2cdetect [-y] [-a] [-q|-r] i2cbus [first last]
i2cdetect -F i2cbus
i2cdetect -V
i2cdetect -l
常用指令
i2cdetect -l            //检测有几组 i2c 总线在系统上 
i2cdetect -y [num]   //检测 i2c-num 上的挂载情况
列举 I2C Bus
mek_8q:/data # ./i2cdetect -l                                                  
i2c-3   i2c             57226000.i2c                            I2C adapter
i2c-1   i2c             i2c-rpmsg-adapter                       I2C adapter
i2c-6   i2c             58226000.i2c                            I2C adapter
i2c-4   i2c             5a800000.i2c                            I2C adapter
i2c-2   i2c             56226000.i2c                            I2C adapter
i2c-7   i2c             58246000.i2c                            I2C adapter
i2c-5   i2c             57247000.i2c                            I2C adapter
列举 I2C Bus I2C4 上面连接的所有设备
 
1|mek_8q:/data # ./i2cdetect -y 4                                              
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- 1c -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- 
50: -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- 6c -- -- -- 
70: -- -- -- -- -- -- -- --

发现 I2C 设备的位置显示为 UU 或者表示设备地址的数值, UU 表示该设备在 driver 中被使用。

i2cdump
语法
i2cdump [-f] [-r first-last] [-y] i2cbus address [mode [bank [bankreg]]]
i2cdump -V
常用指令
i2cdump -f -y [bus-number] [slave-addr] //查看 i2c bus-num 上 slave-addr 寄存器的值
获取 I2C4 总线上设备地址为 0x1c 设备所有寄存器的值
 
mek_8q:/data # ./i2cdump -y -f 4 0x1c                                          
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00    .?..............
10: ff ff 00 22 f4 08 00 00 00 00 00 00 00 00 00 00    ..."??..........
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00    ................
40: 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
60: 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00    .?..............
70: ff ff 00 00 10 10 00 00 00 00 00 00 00 00 00 00    ....??..........
80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
a0: ff ff ff ff ff ff f8 ff 00 00 ff ff 00 ff ff ff    ......?.........
b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
c0: 00 ff 00 00 ff ff ff 00 00 ff ff ff ff ff ff ff    ................
d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
e0: 00 ff 08 00 2b 76 00 ff ff ff ff ff ff ff ff ff    ..?.+v..........
f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................

i2cget
语法
i2cget [-f] [-y] i2cbus chip-address [data-address [mode]]
i2cget -V
常用指令
i2cget -f -y [bus-num] [slave-addr] [register] //读取 i2c 总线 num 上从机 addr 设备寄存器的值
读取 I2C4 总线上设备地址为 0x1c 设备的 0x13 寄存器的值
 
mek_8q:/data # ./i2cget -y -f 4 0x1c 0x13
0x22

i2cset
语法
i2cset [-f] [-y] [-m mask] [-r] i2cbus chip-address data-address [value] ...  [mode]
i2cset -V
常用指令
i2cset -f -y [bus-num] [slave-addr] [register] [val] //设置 i2c 总线 num 上从机 addr 设备的寄存器的值
设置 I2C4 总线上设备地址为 0x1c 设备的 0x13 寄存器的值为 0x11
mek_8q:/data # ./i2cset -y -f 4 0x1c 0x13 0x11​

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