參考：Android 平台下使用 i2c-tools
前文
首先介紹幾個網站
I2C Tools wiki 官方wiki (https://i2c.wiki.kernel.org/index.php/I2C_Tools)
wiki 直接下載壓縮包列表網址 （https://mirrors.edge.kernel.org/pub/software/utils/i2c-tools/)
kernel 的i2c-tools 主線在線閱讀log（https://git.kernel.org/pub/scm/utils/i2c-tools/i2c-tools.git/）
Android編譯
下載源碼后放在任意目錄（我放在android/vendor/i2c-tools)
在目錄下新建Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_C_INCLUDES += $(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 := eng
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) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
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) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
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) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
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) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
mm 在android/out/目錄生成bin文件
問題 如何引用到kernel的iic頭文件的定義的$(LOCAL_PATH)/$(KERNEL_DIR)/include
使用
- i2cdetect
探測 iic 4總線上掛載哪些設備地址
./i2cdetect -r -y 4
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- 49 -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
- i2cdump
查看iic 4總線上0x49設備的寄存器值
./i2cdump -f -y 4 0x49
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 00 00 00 00 05 00 00 00 00 00 00 80 00 00 00 .....?......?...
10: 00 00 00 00 00 00 00 00 83 00 01 00 8c 00 04 c0 ........?.?.?.??
20: 00 00 00 00 10 10 ff ff 7f 04 00 00 00 00 00 00 ....??..??......
30: 00 00 00 00 00 00 00 00 00 00 00 00 42 ff 00 00 ............B...
40: 00 00 00 af 00 00 00 00 00 80 00 07 00 00 00 00 ...?.....?.?....
50: 00 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 ..@.............
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 cc 30 80 01 02 26 ..........?0???&
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 00 ff ................
90: 00 ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 cc 30 80 01 02 26 81 6d 6e ea 3e 00 00 00 00 .?0???&?mn?>....
d0: 00 00 00 00 00 20 00 00 00 00 00 00 08 00 00 00 ..... ......?...
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 00 00 00 00 00 00 00 01 00 00 00 44 00 04 01 bc .......?...D.???
- i2cget
獲取iic 4總線上0x49設備的0x18寄存器 的值
./i2cget -f -y 4 0x49 0x18
0x83
- i2cset
設置iic 4總線上0x49設備的0x18寄存器 的值
# ./i2cset -f -y 4 0x49 0x18 0x88 //設置
#./i2cget -f -y 4 0x49 0x18 <
0x88