make arduino tvout initial release work into atmega32.

Projects Programming
1

Good Morning Arduino Team.

I'd like to improve my understanding about coding. i am really stuck working tvout library to atmega32.

id like to start basic which is the tvout initial release to help understand things step by step.

i believe that the tvout initial release work at atmega328 using the pin 9 and 8.

so this are the pin configuration
//setup the ports

DDRB |= 0x03;
PORTB &= ~0x02;
PORTB |= 0x02;

// inverted fast pwm mode on timer 1
TCCR1A = _BV(COM1A1) | _BV(COM1A0) | _BV(WGM11);
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10);
ICR1 = CYCLES_SCANLINE;
OCR1A = CYCLES_HORZ_SYNC;
OCR1B = CYCLES_OUTPUT_START-20;

how to make it work with the atmega32 which is PD5 is OCR1A and PD6?

sorry for my english =D

hope someone help me.

thanks

2

I also notice there is assembly language at video_gen.cpp.

asm volatile (
//save PORTB
"IN r16,%[port]\n\t"
"ANDI r16,0xFD\n\t"

".macro output\n\t"
"BLD r16,0\n\t" //output pin of the port here pinB0
"OUT %[port],r16\n" //and on the last line of asm
".endm\n"

".macro pixeldelay\n\t" // delay time for setting pixel width
"NOP\n\t" // one can be removed for smaller
"NOP\n\t" // pixels dont forget to remove the
"NOP\n\t" // nop at the start of byteshift
".endm\n"

".macro byteshift\n\t"
"NOP\n\t"
"BST tmp_reg,7\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,6\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,5\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,4\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,3\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,2\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,1\n\t"
"output\n\t"
"pixeldelay\n\t"
"BST tmp_reg,0\n\t"
"output\n"
".endm\n\t"

//output thingy
"LD tmp_reg,X+\n\t" //1
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //2
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //3
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //4
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //5
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //6
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //7
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //8
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //9
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //10
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //11
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //12
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //13
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //14
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //15
"byteshift\n\t"
"LD tmp_reg,X+\n\t" //16
"byteshift\n"

"EndLine_%=:\n\t"
"CBI %[port],0\n\t"
// assembly variable IO:
:
: [port] "i" (_SFR_IO_ADDR(PORTB)),
"x" (screenptr)
: "r16" // try to remove this clobber later...
);
renderLine+=16;

3

anyone?