hi,

let say once again: && (logical AND) and & (bitwise AND) have total different means! This is in basical C-kernel manual.

simple example:
(1000b && 1) !=0 results in not zero value (read TRUE as long as you not redefine basic TRUE value which is defined as any not FALSE (zero by definition)) because BOTH values are not zero;
while
(1000b & 1) results in ZERO.

so in
if ((tmp && 0x01) !=0) /* test LSB */

when tmp is 11xxx for shift iterrations < 5
is always true:

shift = 1:
(11xx && 1) != 0 <- TRUE
shift = 2:
(11x && 1) != 0 <- TRUE
shift = 3:
(11 && 1) != 0 <- TRUE
shift = 4:
(1 && 1) != 0 <- TRUE

So you do send always 1 as output value on serial stream.

BTW: for big iterrations the result may be different depends on the typedef int size und compiler, be careful due sign bit!

Please read C manual careful and you catch difference between logical and bitwise operands!

Regards,
Oleg

[sorry for multiple edition due third hour of night]