How to concatenate 8 sbits of data into one? Bitwise operation? How to implement it?

小99

How to concatenate 8 sbits of data into one? Bitwise operation? How to implement it? [Copy link]

 

How to concatenate 8 sbits of data into one data?

For example, the eight bits of data 0, 1, 0, 1, 0, 0, 1, 1 are concatenated into the eight bits of binary data 0101 0011. Can this be achieved through bitwise operations? How?

29447945

a |= b0 << 7;

a |= b1 << 6;

a |= b2 << 5;

a |= b3 << 4;

a |= b4 << 3

a |= b5 << 2;

a |= b6 << 1;

a |= b7 << 0;

chunyang

Use the shift left and shift right instructions.

小99

29447945 Published on 2019-8-6 14:51 a |= b0 << 7; a |= b1 << 6; a |= b2 << 5; a |= b3 << 4; a |= b4 << 3 ...

Thank you! But if b0, b1, etc. are all bit types, there is no way to perform shift operations? ?

29447945

小99 posted on 2019-8-6 15:50 Thank you! But if b0, b1... these are all bit types, there is no way to perform shift operations? ?

Type conversion

小99

chunyang posted on 2019-8-6 15:21 Use the left and right shift instructions.

It seems that bit data cannot be shifted, an error will be reported!

小99

29447945 Published on 2019-8-6 15:52 Forced type conversion

Is it to force the bit data to be converted into unsigned char type?

littleshrimp

Use union

chunyang

小99 发表于 2019-8-6 15:52 It seems that bit data cannot be shifted, and an error will be reported!

The shift operation is certainly not a bit operation. Is the thinking so linear? The simplest way to do circular shift is to use carry. It is also possible to convert the bit data into byte data and then perform logical operations with the preset variables after shifting, but the execution speed is relatively slow.

chineseboyzxy

Accumulator A is cleared, the bit data is sent to C, and then shifted. After 8 times, there is a byte of data in A.

qiushenghua

Doesn't C51 have a bit addressing area? Why not just use it directly?

generalcircuits

How to achieve it? Can you be more specific?

huo_hu

The simplest method is to send the content of a bit address to another bit address. This requires that both the source and the destination can be bit-addressed. If the destination unit cannot be bit-addressed, it can only be shifted.

sbit can be sent to cy operation