Hi all! This is my first post on the forum, so, hurrah, I guess..?
Anyway, I've connected an LED matrix up with my Arduino and set it up so it works with Glediator.
The problem being, any time I click "Serial Open," the Arduino disconnects.
Would this be a problem with the code I'm using? (Here's the code being used, using directly from Glediator download website)
#define DATA_PORT PORTD
#define DATA_DDR DDRD
#define DATA_PIN 6
#define NUMBER_OF_PIXELS 256
unsigned char display_buffer[NUMBER_OF_PIXELS * 3];
static unsigned char *ptr;
static unsigned int pos = 0;
volatile unsigned char go = 0;
void setup()
{
// Set data pin as output
DATA_DDR |= (1 << DATA_PIN);
// Initialize UART
UCSR0A |= (1<<U2X0);
UCSR0B |= (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0);
UCSR0C |= (1<<UCSZ01) | (1<<UCSZ00) ;
UBRR0H = 0;
UBRR0L = 1; //Baud Rate 1 MBit (at F_CPU = 16MHz)
ptr=display_buffer;
//Enable global interrupts
sei();
}
void loop()
{
if (go==1)
{
cli();
ws2812_sendarray(display_buffer, NUMBER_OF_PIXELS * 3);
sei();
go=0;
}
}
ISR(USART_RX_vect)
{
unsigned char b;
b=UDR0;
if (b == 1) {pos=0; ptr=display_buffer; return;}
if (pos == (NUMBER_OF_PIXELS*3)) {} else {*ptr=b; ptr++; pos++;}
if (pos == ((NUMBER_OF_PIXELS*3)-1)) {go=1;}
}
void ws2812_sendarray(uint8_t *data,uint16_t datlen)
{
uint8_t curbyte,ctr,masklo;
uint8_t maskhi = _BV(DATA_PIN);
masklo =~ maskhi & DATA_PORT;
maskhi |= DATA_PORT;
while (datlen--)
{
curbyte = *data++;
asm volatile
(
" ldi %0,8 \n\t" // 0
"loop%=:out %2, %3 \n\t" // 1
"lsl %1 \n\t" // 2
"dec %0 \n\t" // 3
" rjmp .+0 \n\t" // 5
" brcs .+2 \n\t" // 6l / 7h
" out %2,%4 \n\t" // 7l / -
" rjmp .+0 \n\t" // 9
" nop \n\t" // 10
" out %2,%4 \n\t" // 11
" breq end%= \n\t" // 12 nt. 13 taken
" rjmp .+0 \n\t" // 14
" rjmp .+0 \n\t" // 16
" rjmp .+0 \n\t" // 18
" rjmp loop%= \n\t" // 20
"end%=: \n\t"
: "=&d" (ctr)
: "r" (curbyte), "I" (_SFR_IO_ADDR(DATA_PORT)), "r" (maskhi), "r" (masklo)
);
}
}
