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Rudimentary host-to-device implementation

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This commit is contained in:
Matthias Schiffer 2012-12-06 20:50:13 +01:00
parent 9b0492d105
commit 2e1b7444e2
1 changed files with 75 additions and 3 deletions
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78
ardkbd.c
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@ -6,8 +6,10 @@
#include <stdint.h>
static volatile uint8_t kbd_state = 0;
static volatile int8_t kbd_state = 0;
static volatile uint8_t kbd_input = 0;
static volatile uint8_t kbd_output = 0;
static volatile uint8_t kbd_flags = 0;
@ -38,6 +40,40 @@ ISR(PCINT1_vect) {
if (kbd_clock())
return;
if (kbd_state < 0) {
if (kbd_state >= -8) {
if (kbd_output & (1 << (-1-kbd_state)))
PORTC |= 0x01;
else
PORTC &= ~0x01;
kbd_state--;
return;
}
if (kbd_state == -9) {
if ((__builtin_popcount(kbd_output) & 1) == 0)
PORTC |= 0x01;
else
PORTC &= ~0x01;
kbd_state--;
return;
}
if (kbd_state == -10) {
kbd_state--;
DDRC &= ~0x01;
PORTC |= 0x01;
return;
}
kbd_state = 0;
return;
}
bool data = kbd_data();
if (kbd_state == 0) {
@ -94,7 +130,6 @@ ISR(PCINT1_vect) {
case KBD_CODE_DOWN:
if (ts < 31)
ts++;
PORTB = 0;
break;
}
}
@ -102,6 +137,31 @@ ISR(PCINT1_vect) {
kbd_flags = 0;
}
void kbd_send(uint8_t command) {
while (kbd_state) {} /* wait for idle */
DDRC |= 0x02;
PORTC &= ~0x02;
_delay_us(100);
DDRC |= 0x01;
PORTC &= ~0x01;
_delay_us(10);
DDRC &= ~0x02;
PORTC |= 0x02;
kbd_output = command;
kbd_state = -1;
/* wait for idle */
while (kbd_state) {}
while (!kbd_state) {}
while (kbd_state) {}
}
int main(void) {
DDRB = 0xff;
PORTB = 0;
@ -114,8 +174,20 @@ int main(void) {
sei();
kbd_send(0xff);
uint8_t l = 0;
while(true) {
PORTB ^= 0x20;
uint8_t state = PORTB ^ 0x20;
PORTB = state;
if (state & 0x20) {
l = (l+1)%3;
kbd_send(0xed);
kbd_send(1 << l);
}
uint32_t i;
for (i = 0; i < (1 << ts); i++)