How to convert 4 bytes to an integer ?

[GiggsB]

Do you have an example of the bytes that you receive and know the specific integer that it should form?

Thanks for the reply. Yes, I need to convert it to little endian. On the slave side, I have for ex. 4094 as a 32bit integer. I convert it to 4 8-bit integers as below and then send it over to RP:

          b1 = (unsigned int)(data_adc & 0xff); //data_adc is 32 bit integer
          b2 = (unsigned int)(data_adc >> 8) & 0xff;
          b3 = (unsigned int)(data_adc >> 16) & 0xff;
          b4 = (unsigned int)(data_adc >> 24);

          int testarray[4]={b1,b2,b3,b4};

          for (int i = 0; i < 4; i++){
                        USART_SpiTransfer(USART0, testarray[i]); 
          }

So basically, when this data_adc is always 4094, the slave always sends [254,15,0,0] (checked using debugger on slave side). So, I should receive the same on Raspberry Pi.

In fact when I change the print statement to:

print (b)

I get this:

.
.
[15L, 224L, 0L, 0L]
[0L, 0L, 253L, 224L]
.
.

And these 2 lines are repeating instead of only repeating [254,15,0,0]. Any suggestion, what I might be doing wrong here?