avr

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 would like to remotely reprogram my Arduino via Android over Bluetooth SPP. The first step is to reset the ATMEGA microcontroller. This is accomplished on the Arduino by toggling the DTR line. Is there any API to control the Bluetooth SPP control lines from the Android environment? 回答1: Also it is supported by SPP in general to send or receive the control signals (DTR, DSR, RTS, CTS) I do not know any API or library for android right know, but as you just want to reset your controller... If

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

问题 The following code gives me this error when compiled with avr-g++ compiler ignoring packed attribute because of unpacked non-POD field 'float& foo::BAR' what is the reason? class foo { public: foo(float &bar); private: float &BAR; }; foo::foo(float &bar):BAR(bar) { } int main() { float something; foo fooobject(something); } 回答1: It appears to be a compiler bug : https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58798. 回答2: I don't know about your case in particular, but just to clarify for other

问题 I am working with an 8-bit AVR chip. There is no data type for a 64-bit double (double just maps to the 32-bit float). However, I will be receiving 64-bit doubles over Serial and need to output 64-bit doubles over Serial. How can I convert the 64-bit double to a 32-bit float and back again without casting? The format for both the 32-bit and 64-bit will follow IEEE 754. Of course, I assume a loss of precision when converting to the 32-bit float. For converting from 64-bit to 32-bit float, I am

问题 Can someone please explain how the Arduino bootloader works? I'm not looking for a high level answer here, I've read the code and I get the gist of it. There's a bunch of protocol interaction that happens between the Arduino IDE and the bootloader code, ultimately resulting in a number of inline assembly instructions that self-program the flash with the program being transmitted over the serial interface. What I'm not clear on is on line 270: void (*app_start)(void) = 0x0000; ...which I

问题 Expecting the slave to ACKnowledge and return data, but it does not. This is my protocol. This is my Datasheet The datasheet mentions "The slave will answer by sending bytes with MSB first. Byte0 and byte1 contain the prediction value. All bytes are acknowledged by the master." Edit: Source Library Also FYI I'm on an Arduino Fio but I am not inheriting the Arduino library. #include <avr/io.h> #include <util/delay.h> #include <stdlib.h> #include <uart.h> #include <i2c_master.h> #define LED PB5