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Atmel AVR Studio C programming

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shomikc

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I started teaching Atmel AVR microcontroller this semester.

I need to reverse an array, the first element of array being swapped with last and second element being swapped with second last and so on.

I am getting a recipe for target *.elf failed error.

Please help.
Code: 
#include <avr/io.h>

//void swap (int *px, int *py);

void swap (char *px, char *py)
{
char temp;
temp = *px;
*px = *py;
*py = temp;
}

void reversal (char a[ ], char n)
{
char i, j, k;
 
j = n%2;
// n is the number of elements in the array
if (j == 1)
k = n + 1;
for (i = 0; i < (k)/2 ; i++)
{
swap (&a[i], &a[n - i - 1]);
}
/*for (i = 0; i < n ; i++)
{
printf("%d \n",a[i] );
}*/
}

int main(void)
{
/* Replace with your application code */
char n = 5;
char a[5] = {1, 2, 3, 4, 5};
  
//reversal(a, n);
}
 

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What AVR are you using ? The "recipe" error might refer to the
compiler not having the recipe for compiling for the chip you are using.
It may make a difference whether the source file is *.c or *.cpp.
 
Last edited:

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    shomikc

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k isn't initialized for even n values. For odd n values, the code superfluously swaps the center element with itself.
 

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FenTrac said:
What AVR are you using ? The "recipe" error might refer to the
compiler not having the recipe for compiling for the chip you are using.
It may make a difference whether the source file is *.c or *.cpp.
Click to expand...
Hi. I am using ATxmega128A1 to initialize the project and then I am using the Simulator tool as the debugger.
--- Updated ---

FvM said:
k isn't initialized for even n values. For odd n values, the code superfluously swaps the center element with itself.
Click to expand...
Yes, you are right but the code works in other C ide with int instead of char. so that isnt the problem.
 

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I compiled your code as a .c file in AVR Studio with the project using ATxmega128A1 with GCC, and it completed successfully, with 4 warnings, no errors.
 

    S

    shomikc

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FenTrac said:
I compiled your code as a .c file in AVR Studio with the project using ATxmega128A1 with GCC, and it completed successfully, with 4 warnings, no errors.
Click to expand...
Thankyou. But I am still not able to fix my error. my assembly files work okay. which version of avr studio are you using?
--- Updated ---

shomikc said:
Thankyou. But I am still not able to fix my error. my assembly files work okay. which version of avr studio are you using?
Click to expand...
Also can please send me the warnings.
--- Updated ---

shomikc said:
Thankyou. But I am still not able to fix my error. my assembly files work okay. which version of avr studio are you using?
--- Updated ---


Also can please send me the warnings.
Click to expand...
and do you have a header file of the controller in the dependencies.
--- Updated ---

shomikc said:
Thankyou. But I am still not able to fix my error. my assembly files work okay. which version of avr studio are you using?
--- Updated ---


Also can please send me the warnings.
--- Updated ---


and do you have a header file of the controller in the dependencies.
Click to expand...
I get the same error even with just avr/io.h and just main() function. Now I get recipe for target main.o failed.
 
Last edited:

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I used Atmel AVR studio 7 , (and an old version 6.2). Check that a .c source file is not being built with G++ or a .cpp file being built by GCC

The warning messages are:
Warning 1 array subscript has type 'char'
Warning 2 unused variable 'a'
Warning 3 unused variable 'n'
Warning 4 'k' may be used uninitialized in this function
 
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    shomikc

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Hi,
shomikc said:
Also can please send me the warnings.
Click to expand...
This is what I expected from you...
Because I expected to make your code to work, not FenTrac's code/compiler ...

On the other hand maybe you've learned how important it is to give the errors/warnings for others to get a clue what's going on.

Klaus
 

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    shomikc

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Hi. I would like to know if there is any other software to compile C programs for AVR microcontrollers other than AVR studio. Does MPLAB ide provide compilation of C programs forAVR microcontroller
 

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shomikc said:
Hi. I would like to know if there is any other software to compile C programs for AVR microcontrollers other than AVR studio. Does MPLAB ide provide compilation of C programs forAVR microcontroller
Click to expand...
XC8 with MPLab X will compile for AVR
 

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    shomikc

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Hi. I kind of figured it out. First we turn off windows defender and finally from Debug option we select Options and once there we select the appropriate Toolchain on the right hand of the pop up window. (It may be necessary to disable the antivirus also.)

For the life of me I cannot understand the connection between windows defender and Microchip or Atmel Studio. The Assembler in Simulator mode works with Windows Defender on.

However I am still unable to print the result in The Output, for example, the maximum array.

If you can help with this.
--- Updated ---

shomikc said:
Hi. I kind of figured it out. First we turn off windows defender and finally from Debug option we select Options and once there we select the appropriate Toolchain on the right hand of the pop up window. (It may be necessary to disable the antivirus also.)

For the life of me I cannot understand the connection between windows defender and Microchip or Atmel Studio. The Assembler in Simulator mode works with Windows Defender on.

However I am still unable to print the result in The Output, for example, the maximum array.

If you can help with this.
Click to expand...

Sorry, I meant maximum of an array. If anyone can give some guidance on this. I appreciate all the help given.
 
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Using printf() with an AVR is complicated. Do a google search for more information on how to do it. Usually, output uses the USART on the AVR through a Serial interface to a terminal, such as a TTL to USB converter. Or, to a display such as a 16x2 LCD attached to the AVR.
 

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    shomikc

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FenTrac said:
Using printf() with an AVR is complicated. Do a google search for more information on how to do it. Usually, output uses the USART on the AVR through a Serial interface to a terminal, such as a TTL to USB converter. Or, to a display such as a 16x2 LCD attached to the AVR.
Click to expand...
yes. you are right and it is very complicated. I have tried with USART and not succeeded. thanks. I will keep trying.
 

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The microcontroller's datasheet has the information on configuring the USART registers and sample code for C and assembler. Once configured, data can be put in the transmit register one byte at a time, to send it to the terminal. Below are examples for an ATmega328pb USART0 in C.

Code: 
C:
  UCSR0A |= (1 << U2X0);    // U2X0 = 1 = set double speed mode
  UCSR0B = (1 << RXEN0) | (1 << TXEN0);  // enable transmit, receive
  UCSR0C = (1 << UCSZ01) | (1 << UCSZ00); // Use 8-bit character sizes
  UBRR0 = 16; // load 115200 baud value  into the UBRR0 register
//---------------------------------------------------------------------------------------
to send a byte:
   UDR0 = a[i];

   a[i] may need to have 0x30 added to it to print as the ascii character for a number on the terminal
The code for the AVR you are using will probably be similar.
 
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    shomikc

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