Pico PCM, only one hardcoded mode for now

[picodrive.git] / Pico / Pico / Pico.c

diff --git a/Pico/Pico/Pico.c b/Pico/Pico/Pico.c
index fdd5f44..ece6d64 100644 (file)
--- a/Pico/Pico/Pico.c
+++ b/Pico/Pico/Pico.c
@@ -6,26 +6,43 @@
 picohw_state PicoPicohw;
 
 static int prev_line_cnt_irq3 = 0, prev_line_cnt_irq5 = 0;
+static int fifo_bytes_line = (16000<<16)/60/262/2; // fifo bytes/line. FIXME: other rates, modes
 
-static void PicoLineHookPico(int count)
+static void PicoLinePico(int count)
 {
-
   PicoPicohw.line_counter += count;
-  if ((PicoPicohw.line_counter & 0xf) == 0 || count > 10)
-  {
-    if (PicoPicohw.fifo_bytes > 0)
-      PicoPicohw.fifo_bytes--;
-  }
 
-#if 0
-  if (PicoPicohw.line_counter - prev_line_cnt_irq3 > 200) {
+#if 1
+  if ((PicoPicohw.r12 & 0x4003) && PicoPicohw.line_counter - prev_line_cnt_irq3 > 200) {
     prev_line_cnt_irq3 = PicoPicohw.line_counter;
     // just a guess/hack, allows 101 Dalmantians to boot
     elprintf(EL_ANOMALY, "irq3");
     SekInterrupt(3);
+    return;
+  }
+
+  if (PicoPicohw.fifo_bytes == 16) {
+    prev_line_cnt_irq3 = PicoPicohw.line_counter;
+    elprintf(EL_ANOMALY, "irq3, fb=%i", PicoPicohw.fifo_bytes);
+    SekInterrupt(3);
+    PicoPicohw.fifo_bytes--;
+    return;
   }
 #endif
 
+  if (PicoPicohw.fifo_bytes > 0)
+  {
+    PicoPicohw.fifo_line_bytes += fifo_bytes_line * count;
+    if (PicoPicohw.fifo_line_bytes >= (1<<16)) {
+      PicoPicohw.fifo_bytes -= PicoPicohw.fifo_line_bytes >> 16;
+      PicoPicohw.fifo_line_bytes &= 0xffff;
+      if (PicoPicohw.fifo_bytes < 0)
+        PicoPicohw.fifo_bytes = 0;
+    }
+  }
+  else
+    PicoPicohw.fifo_line_bytes = 0;
+
 #if 0
   if (PicoPicohw.line_counter - prev_line_cnt_irq5 > 512) {
     prev_line_cnt_irq5 = PicoPicohw.line_counter;
@@ -35,16 +52,32 @@ static void PicoLineHookPico(int count)
 #endif
 }
 
+static void PicoResetPico(void)
+{
+  PicoPicoPCMReset();
+  PicoPicohw.xpcm_ptr = PicoPicohw.xpcm_buffer;
+}
+
 PICO_INTERNAL int PicoInitPico(void)
 {
   elprintf(EL_STATUS, "Pico detected");
-  PicoLineHook = PicoLineHookPico;
+  PicoLineHook = PicoLinePico;
+  PicoResetHook = PicoResetPico;
 
   PicoAHW = PAHW_PICO;
   memset(&PicoPicohw, 0, sizeof(PicoPicohw));
   PicoPicohw.pen_pos[0] = 0x03c + 352/2;
   PicoPicohw.pen_pos[1] = 0x200 + 252/2;
-  prev_line_cnt_irq3 = 0, prev_line_cnt_irq5 = 0;
+  prev_line_cnt_irq3 = prev_line_cnt_irq5 = 0;
+
+  // map version register
+  PicoDetectRegion();
+  switch (Pico.m.hardware >> 6) {
+    case 0: PicoPicohw.r1 = 0x00; break;
+    case 1: PicoPicohw.r1 = 0x00; break;
+    case 2: PicoPicohw.r1 = 0x40; break;
+    case 3: PicoPicohw.r1 = 0x20; break;
+  }
 
   return 0;
 }