On 06/19/2017 10:48 PM, Erik Christiansen wrote:
On 15.06.17 14:43, Georg-Johann Lay wrote:
https://gcc.gnu.org/PR20296
is about speeding up "small" ISRs, and is open for 12 years now...
Anyone familiar with avr-gcc knows that a fix would be high effort and risk,
and that's the major reason
On 05/08/16 06:22, a...@tuta.io wrote:
Looks like you are toggling the LED too fast to see it.
Try adding a delay in the while loop
while (1) {
PORTB |= (1 << PB5);
delay_ms(500); /* or something */
}
Look at the avr-libc documentation.
http://nongnu.org/avr-libc/user-manual/
Tom Dean
On 11/26/14 11:46, Andreas Höschler wrote:
#define F_CPU 1600UL /* 16 MHz CPU clock */
#include util/delay.h
#define OUTPUTPORT PORTB
#define OUTPUTPIN PB7
int main (void)
{
DDRB = 0xff; // all outputs
while (1) /* loop forever */
{
if
On 11/26/14 14:25, Andreas Höschler wrote:
#define F_CPU 1600UL /* 16 MHz CPU clock */
#include avr/io.h
#include util/delay.h
#define OUTPUTPORT PORTB
#define OUTPUTPIN PB7
int main (void) {
DDRB = 0xff; // all outputs
while (1) /* loop forever */
How do I change the polarity of the PWM output, WGM mode 5, OCR1A on the
fly?
I use WGM mode 5 to provide PWM to drive gearhead motors. I update the
OCR values every 50 msec. The algorithm makes changes gradually.
If, for example, the motor is CCW at 50%, the OCR value is 128. The
On 08/26/14 11:31, Thomas D. Dean wrote:
I found a sort-of solution. I still have a 1 usec glitch at the end of
the positive group of cycles but not at the inverted group of cycles.
The manual says the change of COM bits is effected at the next compare
match. On the logic analyzer
Sorry, if this is off topic.
I have an application where I want to call a group of functions, in turn.
My initial thought was to use function pointers and a list. If the
function is defined outside the class, I can add it to the list. f1 in
the example. If the function is declared in the
On 06/07/13 09:53, Georg-Johann Lay wrote:
Suppose the following include in a library source.c:
#include avr/pgmspace.h
and the source compiled with, e.g. -mmcu=avr5 or -mmcu=avr35 etc.
This throws a warning like:
$ avr-gcc -mmcu=avr5 source.c -c
In file included from
I forgot, again...
Where do I find the definitions of the AVR groupings?
avr25
avr3
avr31
avr35
avr4
avr5
avr51
avr6
avrxmega3
avrxmega4
avrxmega5
avrxmega6
avrxmega7
tomdean
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I have a group of .S files, library avrx2.6. I want to make a version
of this library for each AVR group and install them in avr/lib/avrn, as
appropriate.
If I use 'make MCU=?', I get a list, including avr1, avr5, etc, as
well as the known types like atmega128, etc.
If I use 'make
On Sun, 2011-02-27 at 21:57 -0800, John Myers wrote:
Hi Ernesto,
www.avrfreaks.net has sticky post with a script to build avr-gcc.
Doing an apt-get may not give you a version with the newest patches.
You do not need the latest patches to get started. I have been using
the apt version for a
I am attempting to compare the uM-FPU and avr-libc floating point times.
I think I am missing something, but, what?
See the code at the bottom.
The code is compiled with:
avr-gcc -Os -mmcu=atmega128 -c -o main.o main.c
avr-gcc -Os -mmcu=atmega128 main.o -o main.elf -lc
avr-objcopy
On Fri, 2011-01-14 at 20:44 -0200, Marcelo Politzer wrote:
It seems to me that you are missing the printf_flt. Try adding:
LDFLAGS+=-lm -Wl,-u,vfprintf -lprintf_flt
Since the avr are so tiny on rom and ram the developers made a version
without float support
to reduce resources usage
On Fri, 2011-01-14 at 20:44 -0200, Marcelo Politzer wrote:
That fixed my problem I have some surprises in the results.
Scope Timer1 What
4.3us 3.5us Convert tcnt1 to float
156us 154us sprintf M_PI
10us8.5us float mult
8.5us 7.0us float add
1.5us 0us float div - sometimes
On Fri, 2011-01-14 at 15:33 -0800, Thomas D. Dean wrote:
I fixed my code and, now see
funcvaluetime(usec)
sprintf 3.141593 154.25
Ftcnt1 21740.00 3.312500
Fmul68298.227000 10.187500
Fadd90038.227000 7.875000
Fdiv0.758547 30.25
Fsin0.180126
I think something strange is being produced by -Os
I reduced a confusing large application to the below code.
Compiling with default optimizaton produced an avr-objdump that follows
the C code as I expected.
avr-gcc -mmcu=atmega16 -c -o err.o err.c
avr-gcc-mmcu=atmega16 err.o -o err.elf
On Wed, 2010-12-29 at 11:48 -0800, Thomas D. Dean wrote:
However, using -Os, I see strange code at c8, ca, etc. The poly
calculation and the sin call seem to be below here. The stack is
cleaned correctly by the 4 ea pop r0's. Why the strange rcalls???
Sorry, should read d0, d2.
tomdean
On Wed, 2010-12-29 at 11:48 -0800, Thomas D. Dean wrote:
Sorry, again. I am really doing good with this post.
avr-gcc --version
avr-gcc (GCC) 4.3.4
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even
On Wed, 2010-12-29 at 13:01 -0800, larry barello wrote:
Strange rcalls are a fast way to allocate four bytes on the stack for a
local...
Thanks, Larry.
Looking thru the code, that is what is happening.
tomdean
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I think I missed something.
I am using the packages: avr-gcc 4.3.2 and avr-libc 1.6.2.cvs100810-2 on
Ubuntu 9.04.
I get several multiple definition errors
avr-gcc -Os -mmcu=atmega128 hello.o hello -o hello.elf -lc
hello: In function `__bad_interrupt':
../../../../crt1/gcrt1.S:193: multiple
avr-gcc -mmcu=atmega32 -S xx.c
avr-as -alhmd -mmcu=atmega16 xx.s xx.lst
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It is really bad when you can't cut-n-paste!
avr-gcc -mmcu=atmega32 -S -fverbose-asm xx.c
avr-as -alhmd -mmcu=atmega16 xx.s xx.lst
Sorry.
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I have code producing strange results. The application uses an 8-bit
counter and overflow counts to measure distance with an ultrasonic
transponder. The overflow and count look Ok. Fitting an equation to
experimental data, I get
dist = 0.013657 * cnts + -3.996578.
Converting the
On Mon, 2009-02-16 at 23:37 +0100, Georg-Johann Lay wrote:
distance = =895*distance;
See my followup message about the typo.
distance = 895*distance.
[...]
895*distance generates a call to __mulsi3, multiplying r25:22 by r21:18
and returning the result in r25:22.
On Tue, 2009-02-17 at 07:05 +0100, Joerg Wunsch wrote:
So you'd have to explain which compiler version exactly you are using
(including patches).
I am using the Ubuntu 8.10 package, installed with apt-get. Most likely
from the ANL archive.
# avr-gcc --version
avr-gcc (GCC) 4.3.0
...
#
The inclusion of __clz_tab may be related to converting the result of
a function call.
This causes the inclusion
float X_target;
X_target = (float)pgm_read_dword(nav_cmd[cli_idx].arg1);
This does NOT cause the inclusion
int32_t lcount, rcount; // this iteration
left_inches =
I did the assignment, cast. avr-gcc seemed to remove that. I did not
try making the temporary variable volatile.
I worked around the problem by putting the apropriate value in the
integers in the structure and using *(float *)int_variable.
-1044381696, copied to a float, not converted, is
In my case, I want to allow interrupts, just want to keep the
statement ordering in the code segment.
The PORTA bits are used for hardware control. I want to use the
atan2(), etc. calls as pulse stretching.
Making the resultant variable volatile works.
tomdean
I have to do the atan2(). It takes a little longer than I would like
the pulse, but, the longer pulse does not hurt anything. So,
including the atan2() in the pulse duration does not waste as much
time as delayxxx() and then do the atan2().
tomdean
I have a code segment which
1. sets a bit in PORTA.
2. calls atan2.
3. clears the same bit in PORTA.
The compiler produces code that
1. sets the bit in PORTA.
2. clears the same bit in PORT.
3. calls atan2.
With -O0, the code is correct.
# uname -a
FreeBSD dv6000.tddhome
I changed the variables to volatile and that fixed things.
The compiler does not seem to move things around the
sin/cos/tan/asin/acos/atan functions, only the atan2.
I put the code segment below. I was looking into size/time for these
functions. I saw what I expected around all the functions
I want to wait for a particular interrupt. I have a one shot trigger
connected to POTRB[0] and Q back to INT2. The one shot is around 3
msec.
I can make the interrupt happen. However, it is one of many. INT2
happens some 3 to 4 msec after the trigger to the one shot.
The one shot triggers
Thanks,
That is close to what I have. I like a couple of your names better.
I will change.
tomdean
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I have a question about preprocessor syntax.
I want to declare som macros that ease controlling port assignments.
in the include file, I have
#define GLUE(a, b) (a##b)
#define PORT(x)(GLUE(PORT, x))
#define PIN(x) (_BV((x)))
#define DDR(x) (GLUE(DDR, x))
#define
I have been looking at the ATmega16 adc in the differential mode in
the STK500v2. I measured the input to the two adc channels with a
Fluke 27 connected directly to the pins. I saw larger differences
than I expected. I also expected the values of 0x3ff and 0x000 to be
the same. Results below.
I discovered the spectrum of the PWM wave was strange.
I used the Fast PWM mode, 31kHz and a sinewave 600Hz modulation
frequency, sampled 8 to 32 times per cycle. IOW, I changed the PWM
pulse width 8 to 32 times per cycle of the modulation sine wave. The
modulation sine wave sampling rate
I did some measurements on a 600Hz, 50% modulated PWM wave at 32kHz.
Modulate the PWM with 600Hz and 8 samples per cycle. I used a TDS
2014.
I see an interrupt every 202.4usec, 1/(8*600). At every interrupt,
the OCR value is set to value[idx], idx=(idx++)%8
value[8] = { 0x80, 0xad, 0xc0, 0xad,
Looks like the patch succeeded.
Hunks are consecutive parts of the patch. I believe fuzz is just
white space.
Where did you install avr-gcc? I put it in /usr/local. The man and
info pages are in /usr/local/man, etc.
tomdean
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I have been investigating PWM on the ATmega16, thinking of how to
produce a modulated output.
I have a spectrum I am trying to duplicate or at least understang.
This first attempt is to produce a PWM, 50% modulated at 600Hz. Some
general PWM questions I have not answered include:
What is the
Thanks for the replies.
I understand basic PWM.
For example, if I modulate the PWM with 600Hz, and use, say, 8
samples per cycle of the 600Hz, I change the PW every 1.67ms.
To recover the original modulation, I think I need something like 10
samples of the highest modulation frequency. So, for
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