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Fixed-point math support in gcc
I've gladly found that avr-gcc from Atmel provided toolchain is compiled with fixed point arithmetic, so I can use different _Fract and _Accum types. I've checked some basic math...
Saturday, 6 November 2010 - 19:45
How to debug application without binaries
I use AVR Studio and JTAGICE. Let's assume I have a programmed microcontroller, which I wish to debug. The software in microcontroller consists of two parts "“ bootloader and...
Wednesday, 27 October 2010 - 10:53
AVR DFU Bootloader
Hi, Do you know where I can find sources of this bootloader? I know that AVRs with USB support are sold with preloaded bootloader, but what to do in situation, when I erased the...
Monday, 25 October 2010 - 07:17
AVR231 – AES bootloader and copyright issue
Hi, I would like to ask about some copyright concerns. Atmel released Application Note AVR231 "“ AES Bootloader with attached code for IAR compiler. Files are copyrighted, but I...
Wednesday, 20 October 2010 - 20:59
gcc version 4.4.3 (AVR_Toolchain_3.0_149) problem with simul
Hi, I use Atmel newest gcc (gcc version 4.4.3 (AVR_Toolchain_3.0_149), seems to be stable now, because IÄ…ve downloaded it from normal Atmel webpage, not as beta download. I use...
Tuesday, 5 October 2010 - 06:28
What for linker read-only memory section exists?
What for linker read-only memory section exists? I declared in linker script new memory region (ROM), defined as read only: MEMORY { text (rx) : ORIGIN = 0, LENGTH =...
Sunday, 3 October 2010 - 19:32
How to move heap start after user defined memory segment.
I interfaced external SRAM memory to ATMega128. Works fine. I wish to have stack, .bss and .data segments in internal SRAM and heap in external. Easy to do, well explained in AVR-...
Saturday, 2 October 2010 - 08:23
Another serious reordering problem, misoptimization and gcc
I would like to access external memory hidden by internal SRAM. To be able to do that I masked AD15 address line, read a byte, and switch AD15 back to normal address line: char...
Friday, 1 October 2010 - 15:02
cli/sei – virtual problem?
In avr-libc manual I've fund an interesting article by Jan Waclawek abort reordering problems in gcc. Let's look at the following code from manual: unsigned int ivar; void...
Saturday, 11 September 2010 - 13:27
Theoretical problem with accessing to 16-bit register
Hi, my problem is rather theoretical, but I think it is interesting to others. Let's assume I want to access 16-bit register, for example ADC. I can use int a=ADC, and it works...
Tuesday, 7 September 2010 - 21:57
Bitfields - bug in AVR Studio Simulator2?
I have the following struct: union Word { uint16_t Word; uint8_t Byte[2]; struct { uint8_t Lo; uint8_t Hi; }; }; struct...
Tuesday, 20 July 2010 - 20:07
Dragon or JTAGICEMkII?
I need to buy programmer with JTAG support for modern AVR processors. Till now I were using JTAGICE, but new devices are unsupported. Dragon is cheap, JTAGICEMkII is more...
Wednesday, 14 July 2010 - 16:08

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