/* Copyright (c) 2012 Georg-Johann Lay All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* $Id$ */ #if !defined (__DOXYGEN__) #if !defined (__AVR_TINY__) #include "asmdef.h" /* char *__utoa_ncheck (unsigned val, char *s, unsigned char radix) This function is the utoa() without checking the radix for 2..36 margins. */ #define val_lo r24 #define val_hi r25 #define str_lo r22 #define radix r20 #define counter r21 #define digit r26 #define sign r27 ENTRY __utoa_ncheck clr sign ENTRY __utoa_common X_movw ZL, str_lo clr counter 1: ; Vanilla 16:8 quotient and remainder to pop the digit ; digit <- val % radix ; val <- val / radix clr digit 2: lsl val_lo rol val_hi rol digit cp digit, radix brlo 3f sub digit, radix inc val_lo 3: subi counter, 16 ; 256 / 16 == 16 loops brne 2b ; Convert the digit to ASCII... subi digit, -'0' cpi digit, '9'+1 brlo 4f subi digit, '0'-'a'+10 4: ; ... and store it to the reversed string st Z+, digit ; Iterate until all digits are sucked out of VAL. sbiw val_lo, 0 brne 1b ; Store the sign (if any) cpse sign, __zero_reg__ st Z+, sign ; Terminate the string with '\0' st Z+, __zero_reg__ ; Reverse the string and return the original string pointer X_movw r24, str_lo XJMP _U(strrev) ENDFUNC #endif /* !__AVR_TINY__ */ #endif /* !__DOXYGEN__ */