Re: [avr-gcc-list] basic UART problem / example

Hello, A lot about serial port programming has been discussed in the avrfreaks forum. This is the best place to get answers. Nayani P --- Przemek Urbanski [EMAIL PROTECTED] wrote: Hey, I am new to avr programming. I can not get my at90s8515 talk to rs232. I wrote basic interrupt driven

Re: [avr-gcc-list] PEN on atmega128

--- Torsten Mohr [EMAIL PROTECTED] wrote: i wonder if anybody ever successfully used an ATMega128? I always assumed that. We have been using ATMega128 without any problems for more than a year. We use the SPI bus to program the chip with AVRISP. On some occations used JTAG programmer.

[avr-gcc-list] bootloader help

Hello all, Perhaps there is ready documentation on bootloader, but I have not been able to get what I wanted. How does one declare a programme to be bootloader program? that is the code must be loaded in the bootsection when I program the chip using avrisp. How does one set the starting address

Re: [avr-gcc-list] output current for ATMega128 on output pins

Torsten, AVR data sheets talk about 25 mA current per pin., but there is some limitation on the total current drawn. If you are planing to drive some LEDs (4/5) I think you can drive them directly from the port pins. You may consider sinking current to switch the LED ON rather than on sourcing

Re: [avr-gcc-list] bootloader: replace bootloader with a new bootloader

Hello, This is something many wish, but unfortunately not possible. Nayani P --- Torsten Mohr [EMAIL PROTECTED] wrote: Hi, i wonder if it is possible to replace a bootloader in an ATMega128 with a new version. Is this possible in a secure way so that a power failure or communication

Re: [avr-gcc-list] memory layout for bootloader

Hello, if you want to place other functions in the bootloader memory add the attribute to these functions as well. Ideally one must set the address of .text to boot address, as bootloader is a completely independent program. I tested by putting the .text in the bootloader section and it worked

Re: [avr-gcc-list] double precision bit representation

Hello, Currently avr-gcc supports only float and not double. The byte pattern given in your query results in a float value of -1.135254 Nayani P --- Kitts [EMAIL PROTECTED] wrote: Hi all, I would like to know how a variable declared as double is represented with avr-libc. What is the

Re: [avr-gcc-list] simple USART (RS232) example for ATmega48

--- [EMAIL PROTECTED] wrote: Hi all, i'm looking for a simple c (AVR-GCC) example program demonstrating the use of the USART0 (as RS232) of my ATmega48. Hello, Here are some program snippets. The following functions are written for Mega8. Please change the name of registers if need be.

RE: [avr-chat] Re: [avr-gcc-list] AVR ISP Error

Hello everybody, There is no switch in the ISP unit. One has to open the covers and there is a provision on the PCB to solder a two pin jumper (taken out of berg connector). Once the soldering is done, plug in the jumper and power up the unit and after a short while the jumper can be removed. Now

Re: [avr-gcc-list] Small program for UART not working

Hello, Some questions, which may lead to solving the problem. 1. Are ysing external crystal? if yes, did you set bit to external crystal. If you aare using internal 4M clock, then please refer the doc on possible baud rates and their errors. If internal clock is used I suggest you use lower baud

Re: [avr-gcc-list] Global variables and ISRs ???

Hello Vincent, To be able to modify/access a variable in interrupt, declare it as volatile. Secondly, to test your code, turn off optimization (s=0) in your make file. There is a problem in your code also - you are not making flag=0 after you send back the character. HTH. Nayani --- Vincent

Re: [avr-gcc-list] Syntax : how to specifiy a binary constant ?

Hello, GCC 3.4.3 must work for foo = 0b; OR foo = 0B; Are you getting compilation errors? Nayani --- Vincent wrote: I tried for example foo = 0b; or foo = b; but neither worked... I am using gcc-avr 3.4.3 and avr-libc 1.2.3

Re: [avr-gcc-list] very simple program

Hello, In order to set the bit, you need to logical OR the bit. DDRB |= _BV (PB0); to clear it DDRB = ~_BV(PB0); Nayani 4: undefined reference to `__stack' #include avr/io.h int main(void){ while (1) { DDRB = _BV(PB0); }; }

[avr-gcc-list] startup file

Hello all, I have written a very simple bootloader and it is working OK. I would like to eliminate the intial interrupt vectors to get more flash space. To achieve this I would like to assemble the crtx file. I am not sure if this is the right approach, and therefore seeking your suggestions. Not

Re: [avr-gcc-list] startup file

Hello Bernd Trog, --- Bernd Trog [EMAIL PROTECTED] wrote: Have you tried to remove *(.vectors) from the linker script? Thanks for the reply. I was not sure if one could remove vector table from being linked. I am under the impression that vector table is a part and parcel of the startup

Re: [avr-gcc-list] (Newbie)2.Delay function not working as required

Hello, What is the code for delayms function? If you have a doubt that optimisation is causing a problem, you could disable optimisation, recompile and check the output (delay time).Regards Nayani Sumeet Pal Singh [EMAIL PROTECTED] wrote: Hi We tried to put delay in our program but it

[avr-gcc-list] sprintf problem

Hello all, In one of my projects (ATMega128 based) I am using floating point numbers and sprintf to write a formatted record to a buffer. Tthe buffer contents is then sent to a mini printer. The first two records print properly and thereafter I am getting garbage from sprintf!! The

Re: [avr-gcc-list] Makefile Changes

Hello Sumeet,If you do not make changes to the source, then why compile again? If you do make changes, WinAvr will compile.RegardsNayaniSumeet Pal Singh [EMAIL PROTECTED] wrote:Can someone suggest some way(part of code of Makefile to change) to make avr-gcc to compile irrespective of whether the

[avr-gcc-list] Is this what we get for trying to help?

you idiot Ankur Handa On Fri, 13 Oct 2006, Parthasaradhi Nayani wrote: Hello, How can you use working code of one board (whose connections may be different from yours) on your board? All you need to know is the initialisation sequence and writing commands/data. Is you LCD connected

Re: [avr-gcc-list] Is this what we get for trying to help?

conclusion is that you are idiot . Have fun with your own replies you idiot Ankur Handa On Fri, 13 Oct 2006, Parthasaradhi Nayani wrote:Hello, How can you use working code of one board (whose connections may be different from yours) on your board? All you need to know is the initialisat

Re: [avr-gcc-list] bootloader for hex file on SD/MMC card

Hello Abhijit, I'm a student working with ATMEGA 8, 16 and 32, making autonomous robots for college contests and projects. I'm looking for a bootloader that will search for an SD/MMC card, find a hex file on it and program itself. This will make it quite easy to make hassle-free code changes

Re: [avr-gcc-list] if test ignored?

Rick Mann [EMAIL PROTECTED] wrote: On an AVR ATmega128: I have two source files. In Serial.c, I define a global: char sCommandReceived; in the corresponding Serial.h file, I have: extern char sCommandReceived; sCommandReceived is set to 1 when enough bytes have been copied into a buffer

RE: [avr-gcc-list] Mega2561 compilation problem

.) - From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Parthasaradhi Nayani Sent: Wednesday, June 06, 2007 6:07 AM To: avr-gcc-list@nongnu.org Subject: [avr-gcc-list] Mega2561 compilation problem Hello all, We were using a Mega128 in one

[avr-gcc-list] Assembly language help

Hello Group, I am writing an assembly language function in which I need to get the address of a sub-routine into a register pair. How can I do it? A sample code is given below. ;--

Re: [avr-gcc-list] Assembly language help

Hello Greg, Thanks a lot. I am now able to get the address. Regards Nayani P Gre7g Luterman [EMAIL PROTECTED] wrote: --- Parthasaradhi Nayani wrote: Hello Group, I am writing an assembly language function in which I need to get the address of a sub-routine into a register pair. How

Re: [avr-gcc-list] Assembly language help

Hello Erik, Erik Christiansen [EMAIL PROTECTED] wrote: http://opensource.cqu.edu.au/cgi-bin/info/info2html.cgi?(as.info)AVR-Modifiers Thanks for the link. This will many people who use assembly language. Few are interested in writing complete assembler programs on the AVR, it seems, though

Re: [avr-gcc-list] Reading eeprom without using routines in eeprom.h, causes reset.

Hello, I tested the code on mega8 using winavr release 20070525. No problems were encountered. NPS Michael [EMAIL PROTECTED] wrote: Hi, when I was new to the avr-gcc (and still fairly new to C), I read the eeprom like this: unsigned char eeread(unsigned char address) {

Re: [avr-gcc-list] Fine Tuning code timings

Hi Alex, I am not sure why you are capturing the timer1 value, unless you are using the timer for other purposes as well. If not then the easiest method is to: 1. Enable time over flow interrupt. 2. Load the timer withe the required delay for the chosen baud rate. The port pin can be made low

[avr-gcc-list] Binding a register pair to a pointer

Hello all, I have a time critical application where I have to process an external interrupt request. When the interrupt occurs, I have to read a port and store this data pointed by a pointer. In order to reduce the time taken by pushes and pops, I would like to bind a register pair to a char

RE: [avr-gcc-list] Binding a register pair to a pointer

Hello Weddington, Thanks for the mail, but the FAQ example is as follows: register unsigned char counter asm (r3) The above is an example for a single byte value, but I would like to bind a pointer which is a 16 bit value and perhaps the X register may be used. I tried using constraints also

RE: [avr-gcc-list] On getting an ISR leaner with GCC

If you look in the avr-libc manual under Frequently Asked Questions you can find FAQ #3: How to permanently bind a variable to a register. That allows you to assign particular registers to variables, although care must be used when using the avr-libc library functions. I had faced a

Re: [avr-gcc-list] Failing to share a flag between two files/modules :-/

Hello, I guess there are two variables named flag being created, one in main and the other in ui.c. Please define the global variable in one .C file of your choice and tell the other file by using extern directive. Hope this solves your problem Nayani --- On Sun, 2/8/09, Vincent Trouilliez

Re: [avr-gcc-list] How to force GCC to not to remove nop statements ?

Hi Vincent, If I understand correctly, the word volatile itself is to tell the compiler not to ignore the statement. I am not sure if your statement is correct, but I have used  asm volatile (nop::); and the compiler never removed the nops from code. Nayani --- On Thu, 2/19/09, Vincent

[avr-gcc-list] introducing a new section in data memory

Hello all, I needed to create a buffer of 256 bytes starting at a page boundary (xx00) in the RAM memory (Mega8). I added this line in the makefile LDFLAGs = -wl,--section-start=.test=0x800200 and defined a variable in the .C file (shown below) unsigned char mem3 __attribute__

[avr-gcc-list] introducing a new section in data memory

Hello all, I sent a mail on the subject but it seems to have got lost   and therefore posting again I need to have a buffer of about 256 bytes starting at a page boundary in the ram of Mega8. To get this I introduced a new section and assigned it an address in makefile. I defined variables,

RE: [avr-gcc-list] introducing a new section in data memory

--- On Fri, 2/20/09, Weddington, Eric ewedding...@cso.atmel.com wrote: First off, is that a typo above? It's suppose to be an uppercase 'W' like so: LDFLAGs = -Wl,--section-start=.test=0x800200 It was a typo. Will test and reply. Thank you for your time. Regards Nayani

RE: [avr-gcc-list] introducing a new section in data memory

First off, is that a typo above? It's suppose to be an uppercase 'W' like so: LDFLAGs = -Wl,--section-start=.test=0x800200 Hi, Checked the 'W' and it was indeed capital letter only. The problem persists!! Any more suggestions please? Thank you. Nayani

Re: [avr-gcc-list] introducing a new section in data memory

--- On Sat, 2/21/09, Georg-Johann Lay a...@gjlay.de wrote: The trouble might return if .data/.bss will grow and then overlap(s) No sir, I needed 256 bytes buffers two and the other variables may total to about 10 or so. The problem is that you cannot introduce holes in a section, i.e.

RE: [avr-gcc-list] introducing a new section in data memory

--- On Sat, 2/21/09, Weddington, Eric ewedding...@cso.atmel.com wrote: It works for me. See attached demo. After the build look at the .map file and the disassembly file (.dis). Just realize that because your variable is now in the .test Attachment error. Trying again for the

Re: [avr-gcc-list] How to tell avr-gcc not to use some registers in the whole program?

--- On Sun, 2/22/09, Georg-Johann Lay a...@gjlay.de wrote: You can do this by introducing two global register variables like register foo_t * pfoo asm (r2); Also note the command line option -ffixed-2 -ffixed-3 that turn R2/R3 into fixed registers (in contrast to R2/R3 beeing

Re: [avr-gcc-list] Re: C vs. assembly performance

From: Nicholas Vinen h...@x256.org For example, things like unsigned char x, y; x = y4 could use the nibble swap instruction rather than four shifts, and things like Shifting a byte or int right or left must push in 00s from the other side so swapping a nibble is not the right thing to

Re: [avr-gcc-list] when is it safe to use -mtiny-stack

The -mtiny-stack may (and should) be used only for devices with 0xFF max RAM adderss, i.e. if SP register is 8-bit. All devices with 1KB and 2KB FLASH memory satisfy this condition, now. Hello all, If the memory size itself is 256 Bytes, naturally SP will be 8 bits and where is the need to

Re: [avr-gcc-list] PN problem

Hi everybody, I am using Winavr for some years and now I started having problems with PN recently. When I start PN and open a project and don't open any source files, commands like clean, make all etc., work. But when I open a source file and try the same commands, I get no rule to make

RE: [avr-gcc-list] PN problem

From: Weddington, Eric eric.wedding...@atmel.com Subject: RE: [avr-gcc-list] PN problem I don't deal much with PN projects. But I would suspect something within the .pnps file. IIRC, this file is XML. Perhaps there is some path issue written in the project file... Hi, Thank you very much

[avr-gcc-list] Storing variables in external memory - suggestions

Hello all, I was wondering if any one can suggest a decent method of automatically assigning address space to variables in external EEPROM. For internal EEPROM the attribute EEMEM will allocate addresses in sequence. One can insert or delete a variable and the address space gets adjusted

Re: [avr-gcc-list] Storing variables in external memory - suggestions

--- On Fri, 5/22/09, David Kelly dke...@hiwaay.net wrote: All EEMEM does is this in eeprom.h: #define EEMEM __attribute__((section(.eeprom))) AVR Studio convention is that internal .eeprom starts at 0x0081. So what I'd do if I were you and wanted the compiler to assign static

Re: [avr-gcc-list] Storing variables in external memory - suggestions

--- On Fri, 5/22/09, David Kelly dke...@hiwaay.net wrote: AVR Studio convention is that internal .eeprom starts at 0x0081. So what I'd do if I were you and wanted the compiler to assign static memory addresses in an external eeprom would be: #define    EEEXT

[avr-gcc-list] Memory problem

Hello all, I have interfaced flash memory to my mega64 and created a section for this memory. I have some variables and two structures which are located in this memory. Initially I defined the variables first and then the structure. After linking I checked the map and list files and found that

Re: [avr-gcc-list] Memory problem

--- On Mon, 6/22/09, David Kelly dke...@hiwaay.net wrote: Study the include files for register definitions for a means of controlling the absolute address of allocation. Thank you David Kelly for your response. I will sieve through the header files to know how to allocate a variable to a

Re: [avr-gcc-list] Memory problem

--- On Tue, 6/23/09, Joerg Wunsch j...@uriah.heep.sax.de wrote: The only method to not have the linker reorder your variables is to just use a single variable (per memory section).  So, put some kind of an embracing struct around all your variables you'd like to have in a particular order, and

Re: [avr-gcc-list] Memory problem

--- On Tue, 6/23/09, David Kelly dke...@hiwaay.net wrote: Something like this might work for you: typedef struct {     uint8_t variable;     uint16_t a, b, c, d;     uint32_t e; } FLASH_STRUCT; #define flash_p ((FLASH_STRUCT *)(0x8000)) Hello David Kelly, Thanks a lot for taking time to

[avr-gcc-list] no rule to make elf - error

Hello all, I am using avr-gcc (WinAVR 20090313) 4.3.2 with PN - version v2.0.8.718-basie. When I create a project and try to compile a very simple file, I am getting make.exe: *** No rule to make target `test.c.elf', needed by `elf'.  Stop. Can some one point ahy I am getting this help? I have

[avr-gcc-list] Xmega support

Hello all, I have just started testing an XMEGA64 chip and I find a peculiar problem when I use sprintf. Following are the environment/specs: XMEGA64 running at 32MHz (using the internal freq generator) USART on PC0, operating at 115K BAUD. One timer in port D being used in compare capture mode.

Re: [avr-gcc-list] Xmega support

Hello All, Just not to enter a wrong address, I copy the address or clear the message and write new one. My apologies for inadvertently doing so. I am creating a new thread with a different heading. Thanks. Nayani --- On Thu, 8/20/09, David Kelly dke...@hiwaay.net wrote: From: David Kelly

[avr-gcc-list] XMEAG64 code problem

Hello All, I am facing a peculiar problem with XMEGA64 code. When I use a global buffer in sprintf, the board appears to reset, but the initial values (which are changed before a call to sprintf) are not getting effected. If I use a local buffer (same size) there is no problem. Can some one

[avr-gcc-list] Larger than 64K memory sections

Hello all, I am using a 4MB flash memory with my Mega64. I would like to create a memory section for the entire 4MB. Is it possible? If yes, how can this be done in the makefile? Thank you very much for your time. Regards, Nayani ___

[avr-gcc-list] Problem allocating memory in xflash

Hello all, I have created an external flash memory section in the makefile thus LDFLAGS += -Wl,--section-start,.exflash=0x85 and named (defined) this section as XFLASH. I have a structure prclkp of size 32 bytes. When I define struct prclkp XFLASH PLULOC1[1023];   No error is reported,

Re: [avr-gcc-list] Re: Larger than 64K memory sections

David Kelly wrote: You are right that we know nothing about the application in question - details here would make it much easier to give recommendations. Hello all, I mentioned 4MB flash as it is the HW spec. This 4MB gets filled over a period of time. Details of application - I have data

Re: [avr-gcc-list] Problem allocating memory in xflash

From: Joerg Wunsch j...@uriah.heep.sax.de Sure, it depends from sizeof(int). My array size is 32K bytes and the section is supposed to be 64K right? and is not the built-in limit of a section 64K? Thanks. Regards Nayani ___ AVR-GCC-list

Re: [avr-gcc-list] Problem allocating memory in xflash

From: Jan Waclawek konf...@efton.sk Sure, it depends from sizeof(int). Hummm, for me, the relationship is not quite sure. Can you explain that in more detail, please? I tried to allocate 32K bytes of memory. I am not sure if this is a problem of user defined sections. Nayani

Re: [avr-gcc-list] Re: Larger than 64K memory sections

From: David Kelly dke...@hiwaay.net 4 million bytes or bits? Most FLASH devices are sized by the bit. It is 4M Bytes. No matter what you do you won't be able to say *MyUInt16Ptr = 0x1234; you will have to write a routine and use it something like this: u16_value = 0x1234; result =

Re: [avr-gcc-list] including default eeprom values in flash memory

From: Michael Clift mich...@clift.com.au     Hi, I am using winavr, and would like to include the default eeprom values (normally output to .eep) in flash memory. I want to do this so that my application can easily default the eeprom. Hello, EEPROM data in FLASH memory? then the easy way is

Re: [avr-gcc-list] PLease help wtih a correct code

--- On Sun, 2/28/10, Jeano Kalawa doki...@yahoo.fr wrote: From: Jeano Kalawa doki...@yahoo.fr   I am working with my final prosject at University. I work with a SHT  75 sensirion sensor to measure temperature and humidity. I use an ATmega 32 controller and have to send data to a PC-skjerme via

[avr-gcc-list] Peculiar code size problem

Hi all, I am working on an ATMEGA8. Since my code was getting close to 8K, I thought I would tweak the code. I have a function listed below void pulse_en (void) {   set_EN; // Set EN   _delay_loop_1 (255);   clr_EN; // clear EN  _delay_loop_1 (255); } Since the delay after the clr instruction

Re: [avr-gcc-list] Peculiar code size problem

Dear Eric, Yes indeed, the total code bloated, though the function size actually reduced. Perhaps my first post was not clear on this point. I can mail you the entire code, should you wish to see it. Please let me know so I can do the needful. I am wondering as to what this cause is and any

Re: [avr-gcc-list] Peculiar code size problem

answered my query. This may also help others who have similar problem. Thanks once again.   Regards, Nayani From: David A. Lyons dly...@lyons42.com To: Parthasaradhi Nayani partha_nay...@yahoo.com Cc: avr-gcc-list@nongnu.org avr-gcc-list@nongnu.org Sent: Monday

[avr-gcc-list] Parm to application

Hello all, I have a boot loader and an application on a Mega168. As boot loader and application are two different entities, is there any way the boot loader can pass a parameter to application code? Would like something like main (int argc, char *argv[]). Any suggestions please? Thank you.  

Re: [avr-gcc-list] Parm to application

From: Georg-Johann Lay a...@gjlay.de Reserve a piece of RAM that does not depend on how the application is compiled, for example at the start of .data (bump .data to a later location) or at the top of the stack (initialize SP to RAMEND-offset). In the boot loader, write the data to that

Re: [avr-gcc-list] Parm to application

From: Georg-Johann Lay a...@gjlay.de With   int x __attribute__((section (.bootdata))); you can use x in the known way, it's only about locating .bootdata to whatever location you deem appropriate.  Read the linker manual. This appears to be the only best way!!! This means I create a section,

[avr-gcc-list] External 256K FLASH - memory pointer

Hello all, I have an external FLASH (serial) of size 256K. I would like to create a memory section for this memory and have pointers (more than 16 bits) to this memory. Can some one help me please?  I am sorry if such a topic has already been dealt with, as my googling did not yield the desired

Re: [avr-gcc-list] External 256K FLASH - memory pointer

From: Joerg Wunsch j...@uriah.heep.sax.de To: avr-gcc-list@nongnu.org Sent: Tuesday, September 18, 2012 11:21 AM What's the point?  A pointer is just a 32-bit (or perhaps 24-bit, in recent AVR-GCC versions) number. Normally, the point of using a pointer is that the compiler arranges for you

Re: [avr-gcc-list] External 256K FLASH - memory pointer

Hello Richard, Thanks a lot for your suggestion. Yes we can and it has already been suggested: Define Your own abstract data type with an underlying 32 bit integer. You can even overload all operators for it to achieve full pointer semantics. But I would not go so far and overload the

Re: [avr-gcc-list] avr-gcc 4.7 for Windows

From:Georg-Johann Lay g...@gcc.gnu.org To: avr-gcc-list@nongnu.org Subject: [avr-gcc-list] avr-gcc 4.7 for Windows GCC 4.7 has just been released, and I decided to provide a MinGW32 build of avr-gcc-4.7.2. Many people feel uncomfortable with building the tools to run under MS Windows, so here

Re: [avr-gcc-list] gcc-avr 4.9.2 -Os messes with interrupt vectors

Hi, "I do *not* want the ISR to be called". I guess you do not want the interrupt to be enabled. If you do not start the timer (as the interrupt is timer related) this interrupt will never occur. If you are using the timer for something else and need the timer running, then you need not