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#define DALI_INVALID 0xa0cc
enum dali_state {
DALI_IDLE = 0,
DALI_SPACE, // 1
DALI_DEAD_SPACE, // 2
DALI_RX_SBIT, // 3
DALI_RX_DATA, // 4
DALI_TX_SBIT0, // 5
DALI_TX_SBIT1, // 6
DALI_TX_0, // 7
DALI_TX_1, // 8
DALI_TX_STOP, // 9
};
static volatile uint8_t dali_state;
static volatile uint8_t dali_rx;
static volatile bool dali_rx_avail;
static volatile uint16_t dali_tx;
static volatile bool dali_tx_rq;
struct dalistat {
uint16_t
rxok,
falsestart,
noise,
manchester;
} dalistat;
#undef DEBUG
#ifdef DEBUG
#define XBUF 36
static uint8_t dbuf[XBUF], sbuf[XBUF], fbuf[XBUF];
static int8_t dbufpos;
#define F_MAJ 0x01
#define F_MCH 0x10
#endif
#define dali_s_listening() (dali_state <= DALI_SPACE)
#define dali_s_cdr() (dali_state == DALI_RX_DATA)
ISR(TIMER0_COMPA_vect)
{
static uint8_t history = 0;
#define hist_size 5
#define hist_mask ((1 << hist_size) - 1)
#define hist_majority_1() (((history | (history + 1)) & hist_mask) == hist_mask)
#define hist_majority_0() (((history & (history - 1)) & hist_mask) == 0)
static uint8_t bitpos = 0;
static uint8_t rx_prevstate_errs, rx_data;
static uint16_t tx_data;
uint8_t bit = 0;
static uint8_t subsamp = 0;
uint8_t flags = 0;
subsamp++;
subsamp &= 7;
/* CTC mode didn't work, CBA to debug */
TCNT0 = 0;
history <<= 1;
history |= (PIND >> D_DALII) & 1;
/*
* subsamp 1 2 3 4 5 6 7 0 ||
* ^ state trigger
* /edge/ <----------- stable / sample ---------->
*/
if (dali_s_cdr()) {
if (subsamp >= 2 && subsamp <= 6 && ((history & 0x0f) == 0x03 || (history & 0x0f) == 0x0c))
subsamp = 4;
}
if (dali_s_listening() && hist_majority_1()) {
rx_prevstate_errs = dali_state;
dali_state = DALI_RX_SBIT;
subsamp = 0;
return;
}
if (subsamp)
return;
#ifdef DEBUG
if (dali_state != DALI_IDLE && dbufpos < XBUF) {
if (dbufpos >= 0) {
sbuf[dbufpos] = dali_state;
dbuf[dbufpos] = history;
}
dbufpos++;
}
#endif
switch (dali_state) {
case DALI_SPACE:
case DALI_DEAD_SPACE:
if (bitpos > 0) {
bitpos--;
return;
}
dali_state = DALI_IDLE;
case DALI_IDLE:
break;
case DALI_RX_SBIT:
if (!hist_majority_0()) {
dalistat.falsestart++;
dali_state = rx_prevstate_errs;
return;
}
dali_state = DALI_RX_DATA;
rx_prevstate_errs = 0;
rx_data = 0;
bitpos = 0;
break;
case DALI_RX_DATA:
if (!(hist_majority_1() || hist_majority_0())) {
rx_prevstate_errs++;
dalistat.noise++;
bit = 0;
} else
bit = hist_majority_1();
if (bitpos & 1) {
if (bit == (rx_data & 1)) {
rx_prevstate_errs++;
dalistat.manchester++;
}
} else {
rx_data <<= 1;
rx_data |= bit;
}
bitpos++;
if (bitpos == 16) {
bitpos = 20;
dali_state = DALI_DEAD_SPACE;
if (!rx_prevstate_errs) {
dali_rx = rx_data;
dali_rx_avail = 1;
dalistat.rxok++;
}
}
break;
case DALI_TX_SBIT0:
bit = 1;
dali_state = DALI_TX_SBIT1;
break;
case DALI_TX_SBIT1:
bit = 0;
dali_state = DALI_TX_0;
break;
case DALI_TX_0:
if (bitpos == 16) {
bitpos = 8;
dali_state = DALI_TX_STOP;
PORTD |= (1 << D_DALIO);
} else {
bit = (tx_data & (1 << (15 - bitpos))) ? 1 : 0;
dali_state = DALI_TX_1;
}
break;
case DALI_TX_1:
bit = (tx_data & (1 << (15 - bitpos))) ? 0 : 1;
bitpos++;
dali_state = DALI_TX_0;
break;
case DALI_TX_STOP:
if (bitpos == 0) {
dali_tx_rq = 0;
bitpos = 25;
dali_state = DALI_SPACE;
} else
bitpos--;
break;
}
if ((dali_state == DALI_TX_SBIT1) || (dali_state == DALI_TX_0) || (dali_state == DALI_TX_1)) {
if (bit) {
PORTD &= ~(1 << D_DALIO);
} else {
PORTD |= (1 << D_DALIO);
}
}
if (dali_state == DALI_IDLE && dali_tx_rq) {
tx_data = dali_tx;
bitpos = 0;
dali_tx = DALI_INVALID;
dali_tx_rq = 2;
dali_state = DALI_TX_SBIT0;
subsamp = 7;
}
}
static void dali_send(uint16_t word)
{
#if 0
uart_wait();
uart_puts("\n\n\ndali_send ");
uart_puthex(word >> 8);
uart_puthex(word & 0xff);
uart_puts("\n");
uart_wait();
dbufpos = -35;
#endif
dali_rx_avail = 0;
dali_tx = word;
asm volatile ("" ::: "memory");
dali_tx_rq = 1;
while (dali_tx_rq || dali_state != DALI_IDLE) {
asm volatile ("" ::: "memory");
}
#if 0
uart_wait();
uart_puts("dali_sent ");
uart_puthex(word >> 8);
uart_puthex(word & 0xff);
uart_puts(" ");
if (dali_rx_avail)
uart_puthex(dali_rx);
else
uart_puts("norx");
uart_puts("\n");
uart_wait();
for (uint8_t x = 0; x < dbufpos; x++)
uart_puthex(sbuf[x]);
uart_puts("\n");
uart_wait();
for (uint8_t x = 0; x < dbufpos; x++)
uart_puthex(dbuf[x]);
uart_puts("\n");
uart_wait();
for (uint8_t x = 0; x < dbufpos; x++)
uart_puthex(fbuf[x]);
uart_puts("\n");
uart_wait();
#endif
}
static void dali_twice(uint16_t word)
{
dali_send(word);
_delay_ms(25);
dali_send(word);
}
static void dali_init(void)
{
PORTD |= (1 << D_DALII) | (1 << D_DALIO);
dali_state = DALI_IDLE;
dali_tx_rq = 0;
dali_rx_avail = 0;
dalistat.falsestart = dalistat.noise = dalistat.manchester = dalistat.rxok = 0;
TIFR0 = (1 << OCF0A);
TCNT0 = 0;
OCR0A = 52; // 8 MHz / 8 / 52 = 19230.
asm volatile ("" ::: "memory");
TIMSK0 = (1 << OCIE0A);
TCCR0A = 0;
asm volatile ("" ::: "memory");
TCCR0B = (0 << CS02) | (1 << CS01) | (0 << CS00); // 8 MHz / 8 = 1MHz
}
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