Convert Long to binary - least signifant bit first

Question

I have found an Arduino function which converts a 2-bytes-long-value to a binary value.

e.g. I call sendCommand(0x05) And it gives me an output:

00000101

void sendCommand(unsigned long command){
 for (unsigned long mask = 1UL << (7); mask; mask >>= 1) {
 if (command & mask) {
 Serial.print( "1" );
 } else {
 Serial.print( "0" );
 }
 }
}

my Problem is, that I want to have the Least significant bit first. How do I have to adjust this function to achieve this?

e.g. sendCommand(0x05) shall give an output:

10100000

Answer 1

void sendCommand(unsigned long command){
 for (unsigned long mask = 1UL; mask<256UL; mask <<= 1) {
 if (command & mask) {
 Serial.print( "1" );
 } else {
 Serial.print( "0" );
 }
 }
}

PS a long is actually 4 bytes long. But your code only uses 1 byte of it.