Linux shell MMPF0100 i2c 获取数据

Posted 2020-07-02 zengjf

#!/system/bin/busybox ash

#
#                  Linux shell MMPF0100 i2c 获取数据 
# 说明：
#     本文主要记录通过shell脚本来获取MMPF0100的数据，更多的是为了更为
# 方便的获取到数据，在进行一些调试的时候能够更有效。
#
#                                     2016-4-1 深圳 南山平山村 曾剑锋
#


# 检查参数个数
if [ $# -lt 3 ]; then
    echo "USAGE:"
    echo "    i2cData.sh <curPage> <firstAddress(hex)> <byteCount(hex)>"
    exit 1
fi

curPage=$1              # 从第几页开始获取
byteCount=$(($3))       # 一次获取多少个字节
firstAddress=$(($2))    # 获取字节的首地址

i2cBusNumber=1          # 采用哪个i2c总线
deviceAdress="0x08"     # i2c设备地址
pageRegAddress="0x7f"   # 存放页的寄存器地址

# 设置MMPF0100地址页
./i2cset -f -y $i2cBusNumber $deviceAdress $pageRegAddress $curPage 

# 显示一些参数
echo "   currentPage : $curPage"
echo "  firstAddress : $firstAddress"
echo "     byteCount : $byteCount"
echo "        i2cBus : /dev/dev-i2c$i2cBusNumber"
echo "  deviceAdress : $deviceAdress"
echo "pageRegAddress : $pageRegAddress"
echo 

# 显示行对应的数
busybox printf "      00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
echo

# i是计数变量
i=$firstAddress
firstLine=true         # 用于判断第一行是否需要填充0
while [ $i -lt $(($byteCount+$firstAddress)) ]
do
    # 16个字节一行，换行并输出行号
    if [ $((i%16)) -eq 0 ];then
        busybox printf "\n0x%x0 " $((i/16))     
        firstLine=false
    else
        # 用于填充一行前面的0，更多的方便16进制查看数据
        if [ $firstLine -eq 0 ];then
            padZero=$((i%16))
            busybox printf "\n0x%x0 " $padZero
            
            # 循环填充数据
            j=0
            while [ $j -lt $padZero ]
            do
                busybox printf " 00" 
                j=$((j+1))
                
            done
            firstLine=false
        fi
    fi
    
    # 读取数据
    data=`./i2cget -f -y $i2cBusNumber $deviceAdress $i`
    busybox printf " %02x" $data
    
    i=$((i+1))
done

echo

# 输出结果：
#     [email protected]:/data/local # ./i2cData.sh 0 0x10 0x50                            
#        currentPage : 0
#       firstAddress : 16
#          byteCount : 80
#             i2cBus : /dev/dev-i2c1
#       deviceAdress : 0x08
#     pageRegAddress : 0x7f
#     
#           00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
#     
#     0x10  00 00 3f 00 00 00 00 00 00 00 00 10 00 00 00 00
#     0x20  2b 1b 2b 0c c4 00 00 00 00 00 00 00 00 00 2b 1b
#     0x30  2b 0c c4 00 00 72 72 72 0c d4 00 00 2c 2c 2c 0c
#     0x40  e4 00 00 2c 2c 2c 0c e4 00 00 6f 6f 6f 0c f4 00
#     0x50  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# [email protected]:/data/local #