+ attachInterruptVector(IRQ_PORTD, pl1th_isr_fixed);
+ attachInterruptVector(IRQ_PORTC, pl2th_isr_fixed);
+ attachInterruptVector(IRQ_PORTA, vsync_isr_nop);
+}
+
+static void udelay(uint32_t us)
+{
+ uint32_t start = micros();
+
+ while ((micros() - start) < us) {
+ asm volatile("nop; nop; nop; nop");
+ yield();
+ }
+}
+
+static void do_start_seq(void)
+{
+ uint32_t edge_cnt_last;
+ uint32_t edge_cnt;
+ uint32_t start, t1, t2;
+ int tout;
+
+ start = micros();
+ edge_cnt = g.edge_cnt;
+
+ /* magic value */
+ g.pl[0].fixed_state[0] =
+ g.pl[0].fixed_state[1] = 0x25;
+
+ for (tout = 10000; tout > 0; tout--) {
+ edge_cnt_last = edge_cnt;
+ udelay(100);
+ edge_cnt = g.edge_cnt;
+
+ if (edge_cnt != edge_cnt_last)
+ continue;
+ if (!PL1_TH())
+ break;
+ }
+
+ g.pl[0].fixed_state[0] = 0x33;
+ g.pl[0].fixed_state[1] = 0x3f;
+ GPIOD_PDOR = 0x33;
+
+ t1 = micros();
+ if (tout == 0) {
+ printf("start_seq timeout1, t=%u\n", t1 - start);
+ return;
+ }
+
+ for (tout = 100000; tout > 0; tout--) {
+ udelay(1);
+
+ if (PL1_TH())
+ break;
+ }
+
+ t2 = micros();
+ if (tout == 0) {
+ printf("start_seq timeout2, t1=%u, t2=%u\n",
+ t1 - start, t2 - t1);
+ return;
+ }
+
+ //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
+
+ if (g.stream_started) {
+ printf("got start_seq when already started\n");
+ return;
+ }
+
+ if (!g.stream_enable_to && !g.stream_enable_from) {
+ printf("got start_seq, without enable from USB\n");
+ return;
+ }
+
+ if (g.stream_enable_to && g.pos_to_p[0].i == g.pos_to_p[0].o) {
+ printf("got start_seq while stream_to is empty\n");
+ return;
+ }
+
+ if (g.stream_enable_from && g.pos_from.i != g.pos_from.o) {
+ printf("got start_seq while stream_from is not empty\n");
+ return;
+ }
+
+ __disable_irq();
+ choose_isrs();
+ g.stream_started = 1;
+ __enable_irq();
+}
+
+// callers must disable IRQs
+static void clear_state(void)
+{
+ int i;
+
+ g.stream_enable_to = 0;
+ g.stream_enable_from = 0;
+ g.stream_started = 0;
+ g.stream_ended = 0;
+ g.inc_mode = INC_MODE_VSYNC;
+ g.use_pending = 0;
+ for (i = 0; i < ARRAY_SIZE(g.pos_to_p); i++)
+ g.pos_to_p[i].i = g.pos_to_p[i].o = 0;
+ g.pos_from.i = g.pos_from.o = 0;
+ g.frame_cnt = 0;
+ memset(g.stream_to[1], 0x3f, sizeof(g.stream_to[1]));
+ choose_isrs_idle();
+}
+
+static int get_space_to(int p)
+{
+ return STREAM_BUF_SIZE - ((g.pos_to_p[p].i - g.pos_to_p[p].o)
+ & STREAM_BUF_MASK);
+}
+
+static int get_used_from(void)
+{
+ return (g.pos_from.i - g.pos_from.o) & STREAM_BUF_MASK;
+}
+
+static void do_usb(void *buf)
+{
+ struct tas_pkt *pkt = buf;
+ uint32_t pos_to_i, i, p;
+ int space;
+
+ switch (pkt->type) {
+ case PKT_FIXED_STATE:
+ memcpy(&i, pkt->data, sizeof(i));
+ if (g.use_pending)
+ g.pl[0].pending_state32 = i;
+ else
+ g.pl[0].fixed_state32 = i;
+ break;
+ case PKT_STREAM_ENABLE:
+ __disable_irq();
+ clear_state();
+ /* wait for start from MD */
+ g.stream_enable_to = pkt->enable.stream_to;
+ g.stream_enable_from = pkt->enable.stream_from;
+ g.inc_mode = pkt->enable.inc_mode;
+ if (pkt->enable.no_start_seq) {
+ GPIOD_PDOR = 0x3f;
+ choose_isrs();
+ g.stream_started = 1;
+ }
+ __enable_irq();
+ break;
+ case PKT_STREAM_ABORT:
+ __disable_irq();
+ clear_state();
+ __enable_irq();
+ break;
+ case PKT_STREAM_END:
+ g.stream_ended = 1;
+ printf("end of stream\n");
+ break;
+ case PKT_STREAM_DATA_TO_P1:
+ case PKT_STREAM_DATA_TO_P2:
+ p = pkt->type == PKT_STREAM_DATA_TO_P1 ? 0 : 1;
+ pos_to_i = g.pos_to_p[p].i;
+ space = get_space_to(p);
+ if (space <= pkt->size / STREAM_EL_SZ) {
+ printf("got data pkt while space=%d\n", space);
+ return;
+ }
+ for (i = 0; i < pkt->size / STREAM_EL_SZ; i++) {
+ memcpy(&g.stream_to[p][pos_to_i++],
+ pkt->data + i * STREAM_EL_SZ,
+ STREAM_EL_SZ);
+ pos_to_i &= STREAM_BUF_MASK;
+ }
+ g.pos_to_p[p].i = pos_to_i;
+ break;
+ default:
+ printf("got unknown pkt type: %04x\n", pkt->type);
+ break;
+ }
+}
+
+static void check_get_data(int p)
+{
+ struct tas_pkt pkt;
+ uint8_t buf[64];