Print hexdump of a buffer. Quickly hacked together but works.

printHexdump.c

// Quick way to print a hexdump of a buffer. Output will look like this:
//
//        0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
// 0000  54 68 69 73 20 69 73 20 61 20 74 65 73 74 20 68   This is  a test h
// 0010  65 78 64 75 6D 70 21 20 46 6F 6F 2E 20 01 02 03   exdump!  Foo. ...
// 0020  04                                                .

inline void printHexdumpAscii(uint16_t index, uint8_t byte) {
    if (index % 16 == 8) {           // some spacing for orientation
        printf(" ");
    }
    if (byte < 32) {
        printf(".");
    }
    else {
        printf("%c", byte);
    }
}

void printHexdump(uint8_t* buf, uint16_t size) {
    printf("       ");                  // empty space in top left corner
    for(uint8_t i = 0; i < 16; i++) {   // print table column header
        printf("%1X  ", i);
    }
    printf("\n%04X  ", 0);              // print first row header
    for(uint16_t i = 0; i < size; i++) {
        printf("%02X ", buf[i]);
        if(i % 16 == 15) {              // end of row
            // print ascii representation
            printf("  ");
            for (uint16_t j = i - 15; j <= i; j++) {
                printHexdumpAscii(j, buf[j]);
            }
            printf("\n%04X  ", i+1);    // print row header
        }
    }
    // print ASCII of last row
    if (size % 16 != 0) {
        uint16_t remaining = 16 - (size % 16);
        for (uint16_t i = 0; i < remaining; i++) {  // fill up empty space of last row
            printf("   ");
        }
        printf("  ");
        for (uint16_t i = size - (size % 16); i < size; i++) {
            printHexdumpAscii(i, buf[i]);
        }
    }
    printf("\n");
}