avr-gcc

问题 I am using AVRDUDE for Android (http://code.google.com/p/andavr/). I can compile the C code. I can run $ avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o led.o led.c $ avr-gcc -mmcu=atmega328p led.o -o led $ avr-objcopy -O ihex -R .eeprom led led.hex all without issues. Then I try to run: avrdude -F -V -c arduino -p ATMEGA328P -P /dev/bus/usb/002/002 -b 115200 -C /data/data/jackpal.androidterm/local/etc/avrdude.conf -U flash:w:led.hex The result is: avrdude: ser_open(): can't open device

问题 I want to add Atmega1281 architecture to my current version of gcc that i am using i.e. v3.3. The Atmega1281 is not supported in the v3.3 and its support got added in v4.2.1 . I cannot upgrade the gcc to 4.2.1, so i need to add the support to my existing compiler. Is there any way to do this ? 回答1: You don't need to update GCC (I presume you are actually using AVR-GCC to generate AVR specific machine code...). All AVR chips use the same AVR core and instruction set. The only thing that

问题 void * memcpy_P( void * dest, PGM_VOID_P src, size_t n ) Could someone please tell me where the above function is implemented in the avr libc library? I can only seem to find a definition for the function in a few header files, not the actual implementation. The reason I want to do this is because at the moment I am doing so performance testing on the AVRAtmega128rfa1 and I need see the AVR assembly code for the function too see how long it takes to execute. Thanks. 回答1: In avr-libc-1.8.0,

问题 so I've been assigned the task of writing a custom reset() function for an AVR compilation. I'm given this info - "Atmega128 and Pic24e have the reset interrupt at the program address 0x0. Write a function reset() to reset a program. I've also heard an easy way to force your system to reboot is by sending it into an infinite loop. Call me crazy, but is this as simple as writing: function reset(){ goto 0x00000000; } Not sure if you can do that, and not looking for a complex explanation, as I'm

问题 so I've been assigned the task of writing a custom reset() function for an AVR compilation. I'm given this info - "Atmega128 and Pic24e have the reset interrupt at the program address 0x0. Write a function reset() to reset a program. I've also heard an easy way to force your system to reboot is by sending it into an infinite loop. Call me crazy, but is this as simple as writing: function reset(){ goto 0x00000000; } Not sure if you can do that, and not looking for a complex explanation, as I'm

问题 I am trying to use the avrfix library in a project, using Eclipse (v4.2.2) as the IDE and avr-gcc as the compiler. Both the header file (avrfix.h) and the library file (libavrfix.a) are included in the same directory, which is in the project's search path as well as the linker's library search path. When compiling, i get the following errors: D:\Documents\Arduino\IMU_Kalman\Release/../HMC5883/HMC5883.cpp:359: undefined reference to `lsincoslk(long, long*)' D:\Documents\Arduino\IMU_Kalman

问题 I am running a C program on an AVR chip. Whenever a serial signal is heard, it runs the serial interrupt ISR (USART_RX_vect). In this method it should turn on change to = 1; . Then in my main while loop, it should clear the LCD and display it and then set change = 0 again. This is to stop it continually doing the calulations, and displaying the result on the LCD a million times a minute.. However, when the interrupt method changes the change variable to 1, it does not seem to change it

问题 Hey I am having trouble understanding the assembly code omitted by the compiler for the following switch statemet. It is different than the usual assembly code I see from using gcc etc. switch(instr) { case OP_NOP: break; case OP_BIPUSH: stack_push(arg0.z.bh); pc_inc = 2; break; } Assembly code for the above C code: switch(instr){ +00001482: 8529 LDD R18,Y+9 Load indirect with displacement +00001483: 2F82 MOV R24,R18 Copy register +00001484: E090 LDI R25,0x00 Load immediate +00001485: 01FC

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . Background Some CPUs, such as the Atmel AVR, have a general purpose register file that is also addressable as part of main memory -- see Figure 7-2 in section 7.4 and the paragraph after the figure. What was WG14 thinking? Given this, why did the C committee choose to make

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . Background Some CPUs, such as the Atmel AVR, have a general purpose register file that is also addressable as part of main memory -- see Figure 7-2 in section 7.4 and the paragraph after the figure. What was WG14 thinking? Given this, why did the C committee choose to make