Shell Script Bitwise operation +FOR Loop + return value to undertake

Implementing a certain bit of a register with a shell script

Pit bit 1:

Not recognized on the Development Board (Ubuntu can)

For ((i=0;i<6;i++))

Do

Done

Into:

For i in ' seq 0 6 '

Do

Done

Pit bit 2:

return value by default only 8 bits are truncated.

Setbits $  $4
Regv=$?
printf "regv=% #x \ n" $REGV

Found only eight low-bits left.


So, change the type of undertaking:

regv= ' RegRead $ '

This is done by directly executing the command or outputting something on the screen, which is the string.

Pit bit 3:

As above, reg= ' RegRead $ ' gets the string if it is not printed with printf "%d", the direct echo line

Pit bit 4:

Reg=setbits $ $4 This way to take a pop grammar error, not C language.

The final test was successful, as follows:

####################################################### # test the SAR-ADC I N SOC ##########################################                                                                                                                                                   #############                                                                                           RegWrite ()                                                                                                            {                                                                                                                                                  Devmem $32}                                                                                  RegRead ()          {Dev                                                                                                                                                         MEM $}                                                                               # #argv [1]: Origin data                                                                                 # #argv [2]: Start bit # #argv [3]: End bit # #argv [4]: ResU                                                                                            Lt Setbits ()                                                                                {                            Value=$1                                                                                                           For i in ' seq $ $ ' do                                                                                 mask=$ ((0x1 << $i))                                                                         #printf "mask =% #x \ n" $mask                                                                         value=$ (($value & ~ $mask))                                                       #printf "clean bit%d value =% #x \ n" $i $value                                                                        mask1=$ ((0x1 << ($i-$))) #printf "Mask1 =% #x \ n" $mask 1 bitv=$ ($4 &am P             MASK1))                                                                  #printf "BITV =% #x \ n" $bitv value=$ ($value |                                                                 ($bitv << $)))                                                                                                         #printf "Set bit%d value =% #x \ n" $i $value done                                                                                printf "% #x \ n" $value                                                                        return $value                                                                                                                                                                                                                             }                     Reg_set_bits ()                                                                  {                                                                                    regv= ' RegRead $ '                                                                       regv= ' setbits $REGV $ $4 '                                                                                                                                           RegWrite $ $REGV}    Reg_set_bits $ $4

　　

Shell Script Bitwise operation +FOR Loop + return value to undertake