Firmware2/Marlin/src/HAL/HAL_AVR/math_AVR.h

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/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
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#ifndef _MATH_AVR_H_
#define _MATH_AVR_H_
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#define a(CODE) " " CODE "\n\t"
/**
* Optimized math functions for AVR
*/
// intRes = longIn1 * longIn2 >> 24
// uses:
// r26 to store 0
// r27 to store bits 16-23 of the 48bit result. The top bit is used to round the two byte result.
// note that the lower two bytes and the upper byte of the 48bit result are not calculated.
// this can cause the result to be out by one as the lower bytes may cause carries into the upper ones.
// B0 A0 are bits 24-39 and are the returned value
// C1 B1 A1 is longIn1
// D2 C2 B2 A2 is longIn2
//
#define MultiU24X32toH16(intRes, longIn1, longIn2) \
asm volatile ( \
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A("clr r26") \
A("mul %A1, %B2") \
A("mov r27, r1") \
A("mul %B1, %C2") \
A("movw %A0, r0") \
A("mul %C1, %C2") \
A("add %B0, r0") \
A("mul %C1, %B2") \
A("add %A0, r0") \
A("adc %B0, r1") \
A("mul %A1, %C2") \
A("add r27, r0") \
A("adc %A0, r1") \
A("adc %B0, r26") \
A("mul %B1, %B2") \
A("add r27, r0") \
A("adc %A0, r1") \
A("adc %B0, r26") \
A("mul %C1, %A2") \
A("add r27, r0") \
A("adc %A0, r1") \
A("adc %B0, r26") \
A("mul %B1, %A2") \
A("add r27, r1") \
A("adc %A0, r26") \
A("adc %B0, r26") \
A("lsr r27") \
A("adc %A0, r26") \
A("adc %B0, r26") \
A("mul %D2, %A1") \
A("add %A0, r0") \
A("adc %B0, r1") \
A("mul %D2, %B1") \
A("add %B0, r0") \
A("clr r1") \
: \
"=&r" (intRes) \
: \
"d" (longIn1), \
"d" (longIn2) \
: \
"r26" , "r27" \
)
// intRes = intIn1 * intIn2 >> 16
// uses:
// r26 to store 0
// r27 to store the byte 1 of the 24 bit result
#define MultiU16X8toH16(intRes, charIn1, intIn2) \
asm volatile ( \
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A("clr r26") \
A("mul %A1, %B2") \
A("movw %A0, r0") \
A("mul %A1, %A2") \
A("add %A0, r1") \
A("adc %B0, r26") \
A("lsr r0") \
A("adc %A0, r26") \
A("adc %B0, r26") \
A("clr r1") \
: \
"=&r" (intRes) \
: \
"d" (charIn1), \
"d" (intIn2) \
: \
"r26" \
)
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#endif // _MATH_AVR_H_