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hi everyone~
im working to make keyboard from V-USB.
but that has few problem.
check up plz.
<main.c> my code :
this code is can't input
PORTA = 0xFF; /* Port A = J4 pins 1-8 - enable pull-up */
DDRA = 0x00; /* Port A is input */
PORTB = 0xFF; /* Port B = J3 pins 1-8 - enable pull-up */
DDRB = 0x00; /* Port B is input */
PORTC = 0xFF; /* Port C = J4 pins 9-16 - enable pull-up */
DDRC = 0x00; /* Port C is input */
PORTD = 0xF8; /* 1111 1000 bin: LED on PD3,4,5 ROW17,18 on PD6,7 */
DDRD = 0x07; /* 0000 0101 bin: these pins are for USB output */
/* USB Reset by device only required on Watchdog Reset */
_delay_us(11); /* delay >10ms for USB reset */
DDRD = 0xF8;
TCCR0 = 5; /* timer 0 prescaler: 1024 */
....................
switch (row) {
case 0x0:
// Port C to weak pullups
DDRC = 0x00;
PORTC = 0xFF;
case 0x1 ... 0x7:
// Scan on A
DDRA = data;
PORTA = ~data;
break;
case 0x8:
// Port A to weak pullups
DDRA = 0x00;
PORTA = 0xFF;
case 0x9 ... 0xF:
// Scan on C
DDRC = data;
PORTC = ~data;
break;
case 0x10 ... 0x12:
// Scan on D
DDRD = data;
PORTD = ~data;
break;
}
data = PINB;
<main.c> my code :
this code can input
PORTA = 0xFF; /* Port A = J4 pins 1-8 - enable pull-up */
DDRA = 0x00; /* Port A is input */
PORTB = 0xFF; /* Port B = J3 pins 1-8 - enable pull-up */
DDRB = 0x00; /* Port B is input */
PORTC = 0xFF; /* Port C = J4 pins 9-16 - enable pull-up */
DDRC = 0x00; /* Port C is input */
PORTD = 0xF8; /* 1111 1000 bin: LED on PD3,4,5 ROW17,18 on PD6,7 */
DDRD = 0x07; /* 0000 0101 bin: these pins are for USB output */
/* USB Reset by device only required on Watchdog Reset */
_delay_us(11); /* delay >10ms for USB reset */
DDRD = 0xF8;
TCCR0 = 5; /* timer 0 prescaler: 1024 */
.................
switch (row) {
case 0x0:
// Port C to weak pullups
DDRC = 0x00;
PORTC = 0xFF;
case 0x1 ... 0x7:
// Scan on A
DDRB = data;
PORTB = ~data;
data = PINA;
break;
case 0x8:
// Port A to weak pullups
DDRA = 0x00;
PORTA = 0xFF;
case 0x9 ... 0xF:
// Scan on C
DDRB = data;
PORTB = ~data;
data = PINC;
break;
}
i think first code is right on pcb
but first code is can't input.
help me plz.Statistics: Posted by Guest — Fri Feb 01, 2013 12:33 pm
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