From 7d5b2dc6ab70c6a1ba66acbbedfcafbee7be7055 Mon Sep 17 00:00:00 2001 From: Charles Lohr Date: Sun, 4 Dec 2016 02:07:01 -0500 Subject: Update -- with stuff most of the way through the livestream. --- tools/avr_codegen/test.lst | 444 --------------------------------------------- 1 file changed, 444 deletions(-) delete mode 100644 tools/avr_codegen/test.lst (limited to 'tools/avr_codegen/test.lst') diff --git a/tools/avr_codegen/test.lst b/tools/avr_codegen/test.lst deleted file mode 100644 index 69e5020..0000000 --- a/tools/avr_codegen/test.lst +++ /dev/null @@ -1,444 +0,0 @@ -GAS LISTING /tmp/ccWx46oe.s page 1 - - - 1 .file "test.c" - 2 __SP_H__ = 0x3e - 3 __SP_L__ = 0x3d - 4 __SREG__ = 0x3f - 5 __tmp_reg__ = 0 - 6 __zero_reg__ = 1 - 9 .text - 10 .Ltext0: - 104 .global delay_ms - 106 delay_ms: - 107 .stabd 46,0,0 - 1:test.c **** #include - 2:test.c **** #include - 3:test.c **** #include - 4:test.c **** #include - 5:test.c **** - 6:test.c **** void delay_ms(uint32_t time) { - 109 .LM0: - 110 .LFBB1: - 111 0000 0F93 push r16 - 112 0002 1F93 push r17 - 113 /* prologue: function */ - 114 /* frame size = 0 */ - 115 /* stack size = 2 */ - 116 .L__stack_usage = 2 - 7:test.c **** uint32_t i; - 8:test.c **** for (i = 0; i < time; i++) { - 118 .LM1: - 119 0004 00E0 ldi r16,0 - 120 0006 10E0 ldi r17,0 - 121 0008 9801 movw r18,r16 - 122 .L2: - 124 .LM2: - 125 000a 0617 cp r16,r22 - 126 000c 1707 cpc r17,r23 - 127 000e 2807 cpc r18,r24 - 128 0010 3907 cpc r19,r25 - 129 0012 01F0 breq .L5 - 130 .LBB6: - 131 .LBB7: - 133 .Ltext1: - 1:/usr/lib/avr/include/util/delay.h **** /* Copyright (c) 2002, Marek Michalkiewicz - 2:/usr/lib/avr/include/util/delay.h **** Copyright (c) 2004,2005,2007 Joerg Wunsch - 3:/usr/lib/avr/include/util/delay.h **** Copyright (c) 2007 Florin-Viorel Petrov - 4:/usr/lib/avr/include/util/delay.h **** All rights reserved. - 5:/usr/lib/avr/include/util/delay.h **** - 6:/usr/lib/avr/include/util/delay.h **** Redistribution and use in source and binary forms, with or without - 7:/usr/lib/avr/include/util/delay.h **** modification, are permitted provided that the following conditions are met: - 8:/usr/lib/avr/include/util/delay.h **** - 9:/usr/lib/avr/include/util/delay.h **** * Redistributions of source code must retain the above copyright - 10:/usr/lib/avr/include/util/delay.h **** notice, this list of conditions and the following disclaimer. - 11:/usr/lib/avr/include/util/delay.h **** - 12:/usr/lib/avr/include/util/delay.h **** * Redistributions in binary form must reproduce the above copyright - 13:/usr/lib/avr/include/util/delay.h **** notice, this list of conditions and the following disclaimer in - 14:/usr/lib/avr/include/util/delay.h **** the documentation and/or other materials provided with the - 15:/usr/lib/avr/include/util/delay.h **** distribution. - 16:/usr/lib/avr/include/util/delay.h **** - GAS LISTING /tmp/ccWx46oe.s page 2 - - - 17:/usr/lib/avr/include/util/delay.h **** * Neither the name of the copyright holders nor the names of - 18:/usr/lib/avr/include/util/delay.h **** contributors may be used to endorse or promote products derived - 19:/usr/lib/avr/include/util/delay.h **** from this software without specific prior written permission. - 20:/usr/lib/avr/include/util/delay.h **** - 21:/usr/lib/avr/include/util/delay.h **** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - 22:/usr/lib/avr/include/util/delay.h **** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - 23:/usr/lib/avr/include/util/delay.h **** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - 24:/usr/lib/avr/include/util/delay.h **** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - 25:/usr/lib/avr/include/util/delay.h **** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - 26:/usr/lib/avr/include/util/delay.h **** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - 27:/usr/lib/avr/include/util/delay.h **** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - 28:/usr/lib/avr/include/util/delay.h **** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - 29:/usr/lib/avr/include/util/delay.h **** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - 30:/usr/lib/avr/include/util/delay.h **** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - 31:/usr/lib/avr/include/util/delay.h **** POSSIBILITY OF SUCH DAMAGE. */ - 32:/usr/lib/avr/include/util/delay.h **** - 33:/usr/lib/avr/include/util/delay.h **** /* $Id$ */ - 34:/usr/lib/avr/include/util/delay.h **** - 35:/usr/lib/avr/include/util/delay.h **** #ifndef _UTIL_DELAY_H_ - 36:/usr/lib/avr/include/util/delay.h **** #define _UTIL_DELAY_H_ 1 - 37:/usr/lib/avr/include/util/delay.h **** - 38:/usr/lib/avr/include/util/delay.h **** #ifndef __HAS_DELAY_CYCLES - 39:/usr/lib/avr/include/util/delay.h **** #define __HAS_DELAY_CYCLES 1 - 40:/usr/lib/avr/include/util/delay.h **** #endif - 41:/usr/lib/avr/include/util/delay.h **** - 42:/usr/lib/avr/include/util/delay.h **** #include - 43:/usr/lib/avr/include/util/delay.h **** #include - 44:/usr/lib/avr/include/util/delay.h **** #include - 45:/usr/lib/avr/include/util/delay.h **** - 46:/usr/lib/avr/include/util/delay.h **** /** \file */ - 47:/usr/lib/avr/include/util/delay.h **** /** \defgroup util_delay : Convenience functions for busy-wait delay loops - 48:/usr/lib/avr/include/util/delay.h **** \code - 49:/usr/lib/avr/include/util/delay.h **** #define F_CPU 1000000UL // 1 MHz - 50:/usr/lib/avr/include/util/delay.h **** //#define F_CPU 14.7456E6 - 51:/usr/lib/avr/include/util/delay.h **** #include - 52:/usr/lib/avr/include/util/delay.h **** \endcode - 53:/usr/lib/avr/include/util/delay.h **** - 54:/usr/lib/avr/include/util/delay.h **** \note As an alternative method, it is possible to pass the - 55:/usr/lib/avr/include/util/delay.h **** F_CPU macro down to the compiler from the Makefile. - 56:/usr/lib/avr/include/util/delay.h **** Obviously, in that case, no \c \#define statement should be - 57:/usr/lib/avr/include/util/delay.h **** used. - 58:/usr/lib/avr/include/util/delay.h **** - 59:/usr/lib/avr/include/util/delay.h **** The functions in this header file are wrappers around the basic - 60:/usr/lib/avr/include/util/delay.h **** busy-wait functions from . They are meant as - 61:/usr/lib/avr/include/util/delay.h **** convenience functions where actual time values can be specified - 62:/usr/lib/avr/include/util/delay.h **** rather than a number of cycles to wait for. The idea behind is - 63:/usr/lib/avr/include/util/delay.h **** that compile-time constant expressions will be eliminated by - 64:/usr/lib/avr/include/util/delay.h **** compiler optimization so floating-point expressions can be used - 65:/usr/lib/avr/include/util/delay.h **** to calculate the number of delay cycles needed based on the CPU - 66:/usr/lib/avr/include/util/delay.h **** frequency passed by the macro F_CPU. - 67:/usr/lib/avr/include/util/delay.h **** - 68:/usr/lib/avr/include/util/delay.h **** \note In order for these functions to work as intended, compiler - 69:/usr/lib/avr/include/util/delay.h **** optimizations must be enabled, and the delay time - 70:/usr/lib/avr/include/util/delay.h **** must be an expression that is a known constant at - 71:/usr/lib/avr/include/util/delay.h **** compile-time. If these requirements are not met, the resulting - 72:/usr/lib/avr/include/util/delay.h **** delay will be much longer (and basically unpredictable), and - 73:/usr/lib/avr/include/util/delay.h **** applications that otherwise do not use floating-point calculations - GAS LISTING /tmp/ccWx46oe.s page 3 - - - 74:/usr/lib/avr/include/util/delay.h **** will experience severe code bloat by the floating-point library - 75:/usr/lib/avr/include/util/delay.h **** routines linked into the application. - 76:/usr/lib/avr/include/util/delay.h **** - 77:/usr/lib/avr/include/util/delay.h **** The functions available allow the specification of microsecond, and - 78:/usr/lib/avr/include/util/delay.h **** millisecond delays directly, using the application-supplied macro - 79:/usr/lib/avr/include/util/delay.h **** F_CPU as the CPU clock frequency (in Hertz). - 80:/usr/lib/avr/include/util/delay.h **** - 81:/usr/lib/avr/include/util/delay.h **** */ - 82:/usr/lib/avr/include/util/delay.h **** - 83:/usr/lib/avr/include/util/delay.h **** #if !defined(__DOXYGEN__) - 84:/usr/lib/avr/include/util/delay.h **** static inline void _delay_us(double __us) __attribute__((always_inline)); - 85:/usr/lib/avr/include/util/delay.h **** static inline void _delay_ms(double __ms) __attribute__((always_inline)); - 86:/usr/lib/avr/include/util/delay.h **** #endif - 87:/usr/lib/avr/include/util/delay.h **** - 88:/usr/lib/avr/include/util/delay.h **** #ifndef F_CPU - 89:/usr/lib/avr/include/util/delay.h **** /* prevent compiler error by supplying a default */ - 90:/usr/lib/avr/include/util/delay.h **** # warning "F_CPU not defined for " - 91:/usr/lib/avr/include/util/delay.h **** # define F_CPU 1000000UL - 92:/usr/lib/avr/include/util/delay.h **** #endif - 93:/usr/lib/avr/include/util/delay.h **** - 94:/usr/lib/avr/include/util/delay.h **** #ifndef __OPTIMIZE__ - 95:/usr/lib/avr/include/util/delay.h **** # warning "Compiler optimizations disabled; functions from won't work as designed" - 96:/usr/lib/avr/include/util/delay.h **** #endif - 97:/usr/lib/avr/include/util/delay.h **** - 98:/usr/lib/avr/include/util/delay.h **** #if __HAS_DELAY_CYCLES && defined(__OPTIMIZE__) && \ - 99:/usr/lib/avr/include/util/delay.h **** !defined(__DELAY_BACKWARD_COMPATIBLE__) && \ - 100:/usr/lib/avr/include/util/delay.h **** __STDC_HOSTED__ - 101:/usr/lib/avr/include/util/delay.h **** # include - 102:/usr/lib/avr/include/util/delay.h **** #endif - 103:/usr/lib/avr/include/util/delay.h **** - 104:/usr/lib/avr/include/util/delay.h **** /** - 105:/usr/lib/avr/include/util/delay.h **** \ingroup util_delay - 106:/usr/lib/avr/include/util/delay.h **** - 107:/usr/lib/avr/include/util/delay.h **** Perform a delay of \c __ms milliseconds, using _delay_loop_2(). - 108:/usr/lib/avr/include/util/delay.h **** - 109:/usr/lib/avr/include/util/delay.h **** The macro F_CPU is supposed to be defined to a - 110:/usr/lib/avr/include/util/delay.h **** constant defining the CPU clock frequency (in Hertz). - 111:/usr/lib/avr/include/util/delay.h **** - 112:/usr/lib/avr/include/util/delay.h **** The maximal possible delay is 262.14 ms / F_CPU in MHz. - 113:/usr/lib/avr/include/util/delay.h **** - 114:/usr/lib/avr/include/util/delay.h **** When the user request delay which exceed the maximum possible one, - 115:/usr/lib/avr/include/util/delay.h **** _delay_ms() provides a decreased resolution functionality. In this - 116:/usr/lib/avr/include/util/delay.h **** mode _delay_ms() will work with a resolution of 1/10 ms, providing - 117:/usr/lib/avr/include/util/delay.h **** delays up to 6.5535 seconds (independent from CPU frequency). The - 118:/usr/lib/avr/include/util/delay.h **** user will not be informed about decreased resolution. - 119:/usr/lib/avr/include/util/delay.h **** - 120:/usr/lib/avr/include/util/delay.h **** If the avr-gcc toolchain has __builtin_avr_delay_cycles(unsigned long) - 121:/usr/lib/avr/include/util/delay.h **** support, maximal possible delay is 4294967.295 ms/ F_CPU in MHz. For - 122:/usr/lib/avr/include/util/delay.h **** values greater than the maximal possible delay, overflows results in - 123:/usr/lib/avr/include/util/delay.h **** no delay i.e., 0ms. - 124:/usr/lib/avr/include/util/delay.h **** - 125:/usr/lib/avr/include/util/delay.h **** Conversion of __us into clock cycles may not always result in integer. - 126:/usr/lib/avr/include/util/delay.h **** By default, the clock cycles rounded up to next integer. This ensures that - 127:/usr/lib/avr/include/util/delay.h **** the user gets atleast __us microseconds of delay. - 128:/usr/lib/avr/include/util/delay.h **** - 129:/usr/lib/avr/include/util/delay.h **** Alternatively, user can define __DELAY_ROUND_DOWN__ and __DELAY_ROUND_CLOSEST__ - 130:/usr/lib/avr/include/util/delay.h **** to round down and round to closest integer. - GAS LISTING /tmp/ccWx46oe.s page 4 - - - 131:/usr/lib/avr/include/util/delay.h **** - 132:/usr/lib/avr/include/util/delay.h **** Note: The new implementation of _delay_ms(double __ms) with - 133:/usr/lib/avr/include/util/delay.h **** __builtin_avr_delay_cycles(unsigned long) support is not backward compatible. - 134:/usr/lib/avr/include/util/delay.h **** User can define __DELAY_BACKWARD_COMPATIBLE__ to get a backward compatible delay. - 135:/usr/lib/avr/include/util/delay.h **** Also, the backward compatible - 136:/usr/lib/avr/include/util/delay.h **** algorithm will be chosen if the code is compiled in a freestanding - 137:/usr/lib/avr/include/util/delay.h **** environment (GCC option \c -ffreestanding), as the math functions - 138:/usr/lib/avr/include/util/delay.h **** required for rounding are not available to the compiler then. - 139:/usr/lib/avr/include/util/delay.h **** - 140:/usr/lib/avr/include/util/delay.h **** */ - 141:/usr/lib/avr/include/util/delay.h **** void - 142:/usr/lib/avr/include/util/delay.h **** _delay_ms(double __ms) - 143:/usr/lib/avr/include/util/delay.h **** { - 144:/usr/lib/avr/include/util/delay.h **** double __tmp ; - 145:/usr/lib/avr/include/util/delay.h **** #if __HAS_DELAY_CYCLES && defined(__OPTIMIZE__) && \ - 146:/usr/lib/avr/include/util/delay.h **** !defined(__DELAY_BACKWARD_COMPATIBLE__) && \ - 147:/usr/lib/avr/include/util/delay.h **** __STDC_HOSTED__ - 148:/usr/lib/avr/include/util/delay.h **** uint32_t __ticks_dc; - 149:/usr/lib/avr/include/util/delay.h **** extern void __builtin_avr_delay_cycles(unsigned long); - 150:/usr/lib/avr/include/util/delay.h **** __tmp = ((F_CPU) / 1e3) * __ms; - 151:/usr/lib/avr/include/util/delay.h **** - 152:/usr/lib/avr/include/util/delay.h **** #if defined(__DELAY_ROUND_DOWN__) - 153:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)fabs(__tmp); - 154:/usr/lib/avr/include/util/delay.h **** - 155:/usr/lib/avr/include/util/delay.h **** #elif defined(__DELAY_ROUND_CLOSEST__) - 156:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)(fabs(__tmp)+0.5); - 157:/usr/lib/avr/include/util/delay.h **** - 158:/usr/lib/avr/include/util/delay.h **** #else - 159:/usr/lib/avr/include/util/delay.h **** //round up by default - 160:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)(ceil(fabs(__tmp))); - 161:/usr/lib/avr/include/util/delay.h **** #endif - 162:/usr/lib/avr/include/util/delay.h **** - 163:/usr/lib/avr/include/util/delay.h **** __builtin_avr_delay_cycles(__ticks_dc); - 135 .LM3: - 136 0014 EFEC ldi r30,lo8(1999) - 137 0016 F7E0 ldi r31,hi8(1999) - 138 0018 3197 1: sbiw r30,1 - 139 001a 01F4 brne 1b - 140 001c 00C0 rjmp . - 141 001e 0000 nop - 142 .LBE7: - 143 .LBE6: - 145 .Ltext2: - 147 .LM4: - 148 0020 0F5F subi r16,-1 - 149 0022 1F4F sbci r17,-1 - 150 0024 2F4F sbci r18,-1 - 151 0026 3F4F sbci r19,-1 - 152 0028 00C0 rjmp .L2 - 153 .L5: - 154 /* epilogue start */ - 9:test.c **** _delay_ms(1); - 10:test.c **** } - 11:test.c **** } - 156 .LM5: - 157 002a 1F91 pop r17 - 158 002c 0F91 pop r16 - GAS LISTING /tmp/ccWx46oe.s page 5 - - - 159 002e 0895 ret - 164 .Lscope1: - 166 .stabd 78,0,0 - 167 .section .text.startup,"ax",@progbits - 169 .global main - 171 main: - 172 .stabd 46,0,0 - 12:test.c **** - 13:test.c **** #define NOOP asm volatile("nop" ::) - 14:test.c **** - 15:test.c **** - 16:test.c **** static void setup_clock( void ) - 17:test.c **** { - 18:test.c **** /*Examine Page 33*/ - 19:test.c **** - 20:test.c **** CLKPR = 0x80; /*Setup CLKPCE to be receptive*/ - 21:test.c **** CLKPR = 0x00; /*No scalar*/ - 22:test.c **** OSCCAL = 0x80; //B8 is bottom E8 is top. - 23:test.c **** } - 24:test.c **** - 25:test.c **** int main( ) - 26:test.c **** { - 174 .LM6: - 175 .LFBB2: - 176 /* prologue: function */ - 177 /* frame size = 0 */ - 178 /* stack size = 0 */ - 179 .L__stack_usage = 0 - 27:test.c **** cli(); - 181 .LM7: - 182 /* #APP */ - 183 ; 27 "test.c" 1 - 184 0000 F894 cli - 185 ; 0 "" 2 - 186 /* #NOAPP */ - 187 .LBB12: - 188 .LBB13: - 20:test.c **** CLKPR = 0x00; /*No scalar*/ - 190 .LM8: - 191 0002 80E8 ldi r24,lo8(-128) - 192 0004 86BD out 0x26,r24 - 21:test.c **** OSCCAL = 0x80; //B8 is bottom E8 is top. - 194 .LM9: - 195 0006 16BC out 0x26,__zero_reg__ - 22:test.c **** } - 197 .LM10: - 198 0008 81BF out 0x31,r24 - 199 .LBE13: - 200 .LBE12: - 28:test.c **** setup_clock(); - 29:test.c **** DDRB = _BV(4); - 202 .LM11: - 203 000a 80E1 ldi r24,lo8(16) - 204 000c 87BB out 0x17,r24 - 30:test.c **** uint8_t marker; - 31:test.c **** - 32:test.c **** while(1) - GAS LISTING /tmp/ccWx46oe.s page 6 - - - 33:test.c **** { - 34:test.c **** marker = 0x05; - 35:test.c **** do{ - 36:test.c **** PORTB = _BV(4); - 206 .LM12: - 207 000e 90E1 ldi r25,lo8(16) - 208 .L8: - 26:test.c **** cli(); - 210 .LM13: - 211 0010 85E0 ldi r24,lo8(5) - 212 .L7: - 214 .LM14: - 215 0012 98BB out 0x18,r25 - 37:test.c **** marker--; - 38:test.c **** PORTB = 0; - 217 .LM15: - 218 0014 18BA out 0x18,__zero_reg__ - 219 0016 8150 subi r24,lo8(-(-1)) - 39:test.c **** } while( marker ); - 221 .LM16: - 222 0018 01F4 brne .L7 - 223 .LBB14: - 224 .LBB15: - 226 .Ltext3: - 164:/usr/lib/avr/include/util/delay.h **** - 165:/usr/lib/avr/include/util/delay.h **** #else - 166:/usr/lib/avr/include/util/delay.h **** uint16_t __ticks; - 167:/usr/lib/avr/include/util/delay.h **** __tmp = ((F_CPU) / 4e3) * __ms; - 168:/usr/lib/avr/include/util/delay.h **** if (__tmp < 1.0) - 169:/usr/lib/avr/include/util/delay.h **** __ticks = 1; - 170:/usr/lib/avr/include/util/delay.h **** else if (__tmp > 65535) - 171:/usr/lib/avr/include/util/delay.h **** { - 172:/usr/lib/avr/include/util/delay.h **** // __ticks = requested delay in 1/10 ms - 173:/usr/lib/avr/include/util/delay.h **** __ticks = (uint16_t) (__ms * 10.0); - 174:/usr/lib/avr/include/util/delay.h **** while(__ticks) - 175:/usr/lib/avr/include/util/delay.h **** { - 176:/usr/lib/avr/include/util/delay.h **** // wait 1/10 ms - 177:/usr/lib/avr/include/util/delay.h **** _delay_loop_2(((F_CPU) / 4e3) / 10); - 178:/usr/lib/avr/include/util/delay.h **** __ticks --; - 179:/usr/lib/avr/include/util/delay.h **** } - 180:/usr/lib/avr/include/util/delay.h **** return; - 181:/usr/lib/avr/include/util/delay.h **** } - 182:/usr/lib/avr/include/util/delay.h **** else - 183:/usr/lib/avr/include/util/delay.h **** __ticks = (uint16_t)__tmp; - 184:/usr/lib/avr/include/util/delay.h **** _delay_loop_2(__ticks); - 185:/usr/lib/avr/include/util/delay.h **** #endif - 186:/usr/lib/avr/include/util/delay.h **** } - 187:/usr/lib/avr/include/util/delay.h **** - 188:/usr/lib/avr/include/util/delay.h **** /** - 189:/usr/lib/avr/include/util/delay.h **** \ingroup util_delay - 190:/usr/lib/avr/include/util/delay.h **** - 191:/usr/lib/avr/include/util/delay.h **** Perform a delay of \c __us microseconds, using _delay_loop_1(). - 192:/usr/lib/avr/include/util/delay.h **** - 193:/usr/lib/avr/include/util/delay.h **** The macro F_CPU is supposed to be defined to a - 194:/usr/lib/avr/include/util/delay.h **** constant defining the CPU clock frequency (in Hertz). - 195:/usr/lib/avr/include/util/delay.h **** - 196:/usr/lib/avr/include/util/delay.h **** The maximal possible delay is 768 us / F_CPU in MHz. - GAS LISTING /tmp/ccWx46oe.s page 7 - - - 197:/usr/lib/avr/include/util/delay.h **** - 198:/usr/lib/avr/include/util/delay.h **** If the user requests a delay greater than the maximal possible one, - 199:/usr/lib/avr/include/util/delay.h **** _delay_us() will automatically call _delay_ms() instead. The user - 200:/usr/lib/avr/include/util/delay.h **** will not be informed about this case. - 201:/usr/lib/avr/include/util/delay.h **** - 202:/usr/lib/avr/include/util/delay.h **** If the avr-gcc toolchain has __builtin_avr_delay_cycles(unsigned long) - 203:/usr/lib/avr/include/util/delay.h **** support, maximal possible delay is 4294967.295 us/ F_CPU in MHz. For - 204:/usr/lib/avr/include/util/delay.h **** values greater than the maximal possible delay, overflow results in - 205:/usr/lib/avr/include/util/delay.h **** no delay i.e., 0us. - 206:/usr/lib/avr/include/util/delay.h **** - 207:/usr/lib/avr/include/util/delay.h **** Conversion of __us into clock cycles may not always result in integer. - 208:/usr/lib/avr/include/util/delay.h **** By default, the clock cycles rounded up to next integer. This ensures that - 209:/usr/lib/avr/include/util/delay.h **** the user gets atleast __us microseconds of delay. - 210:/usr/lib/avr/include/util/delay.h **** - 211:/usr/lib/avr/include/util/delay.h **** Alternatively, user can define __DELAY_ROUND_DOWN__ and __DELAY_ROUND_CLOSEST__ - 212:/usr/lib/avr/include/util/delay.h **** to round down and round to closest integer. - 213:/usr/lib/avr/include/util/delay.h **** - 214:/usr/lib/avr/include/util/delay.h **** Note: The new implementation of _delay_us(double __us) with - 215:/usr/lib/avr/include/util/delay.h **** __builtin_avr_delay_cycles(unsigned long) support is not backward compatible. - 216:/usr/lib/avr/include/util/delay.h **** User can define __DELAY_BACKWARD_COMPATIBLE__ to get a backward compatible delay. - 217:/usr/lib/avr/include/util/delay.h **** Also, the backward compatible - 218:/usr/lib/avr/include/util/delay.h **** algorithm will be chosen if the code is compiled in a freestanding - 219:/usr/lib/avr/include/util/delay.h **** environment (GCC option \c -ffreestanding), as the math functions - 220:/usr/lib/avr/include/util/delay.h **** required for rounding are not available to the compiler then. - 221:/usr/lib/avr/include/util/delay.h **** - 222:/usr/lib/avr/include/util/delay.h **** */ - 223:/usr/lib/avr/include/util/delay.h **** void - 224:/usr/lib/avr/include/util/delay.h **** _delay_us(double __us) - 225:/usr/lib/avr/include/util/delay.h **** { - 226:/usr/lib/avr/include/util/delay.h **** double __tmp ; - 227:/usr/lib/avr/include/util/delay.h **** #if __HAS_DELAY_CYCLES && defined(__OPTIMIZE__) && \ - 228:/usr/lib/avr/include/util/delay.h **** !defined(__DELAY_BACKWARD_COMPATIBLE__) && \ - 229:/usr/lib/avr/include/util/delay.h **** __STDC_HOSTED__ - 230:/usr/lib/avr/include/util/delay.h **** uint32_t __ticks_dc; - 231:/usr/lib/avr/include/util/delay.h **** extern void __builtin_avr_delay_cycles(unsigned long); - 232:/usr/lib/avr/include/util/delay.h **** __tmp = ((F_CPU) / 1e6) * __us; - 233:/usr/lib/avr/include/util/delay.h **** - 234:/usr/lib/avr/include/util/delay.h **** #if defined(__DELAY_ROUND_DOWN__) - 235:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)fabs(__tmp); - 236:/usr/lib/avr/include/util/delay.h **** - 237:/usr/lib/avr/include/util/delay.h **** #elif defined(__DELAY_ROUND_CLOSEST__) - 238:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)(fabs(__tmp)+0.5); - 239:/usr/lib/avr/include/util/delay.h **** - 240:/usr/lib/avr/include/util/delay.h **** #else - 241:/usr/lib/avr/include/util/delay.h **** //round up by default - 242:/usr/lib/avr/include/util/delay.h **** __ticks_dc = (uint32_t)(ceil(fabs(__tmp))); - 243:/usr/lib/avr/include/util/delay.h **** #endif - 244:/usr/lib/avr/include/util/delay.h **** - 245:/usr/lib/avr/include/util/delay.h **** __builtin_avr_delay_cycles(__ticks_dc); - 228 .LM17: - 229 001a E3E3 ldi r30,lo8(-32205) - 230 001c F2E8 ldi r31,hi8(-32205) - 231 001e 3197 1: sbiw r30,1 - 232 0020 01F4 brne 1b - 233 0022 00C0 rjmp . - 234 0024 0000 nop - 235 0026 00C0 rjmp .L8 - GAS LISTING /tmp/ccWx46oe.s page 8 - - - 236 .LBE15: - 237 .LBE14: - 239 .Lscope2: - 241 .stabd 78,0,0 - 242 .text - 244 .Letext0: - 245 .ident "GCC: (GNU) 4.9.2" - GAS LISTING /tmp/ccWx46oe.s page 9 - - -DEFINED SYMBOLS - *ABS*:0000000000000000 test.c - /tmp/ccWx46oe.s:2 *ABS*:000000000000003e __SP_H__ - /tmp/ccWx46oe.s:3 *ABS*:000000000000003d __SP_L__ - /tmp/ccWx46oe.s:4 *ABS*:000000000000003f __SREG__ - /tmp/ccWx46oe.s:5 *ABS*:0000000000000000 __tmp_reg__ - /tmp/ccWx46oe.s:6 *ABS*:0000000000000001 __zero_reg__ - /tmp/ccWx46oe.s:106 .text:0000000000000000 delay_ms - /tmp/ccWx46oe.s:171 .text.startup:0000000000000000 main - -NO UNDEFINED SYMBOLS -- cgit v1.2.3