lowercasing filenames, part3

[picodrive.git] / pico / pico / pico.c

diff --git a/pico/pico/pico.c b/pico/pico/pico.c
new file mode 100644 (file)
index 0000000..298e57e
--- /dev/null
+++ b/pico/pico/pico.c
@@ -0,0 +1,97 @@
+#include "../pico_int.h"
+
+// x: 0x03c - 0x19d
+// y: 0x1fc - 0x2f7
+//    0x2f8 - 0x3f3
+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;
+
+static const int guessed_rates[] = { 8000, 14000, 12000, 14000, 16000, 18000, 16000, 16000 }; // ?
+
+#define PICOHW_FIFO_IRQ_THRESHOLD 12
+
+PICO_INTERNAL void PicoReratePico(void)
+{
+  int rate = guessed_rates[PicoPicohw.r12 & 7];
+  if (Pico.m.pal)
+       fifo_bytes_line = (rate<<16)/50/312/2;
+  else fifo_bytes_line = (rate<<16)/60/262/2;
+  PicoPicoPCMRerate(rate);
+}
+
+static void PicoLinePico(void)
+{
+  PicoPicohw.line_counter++;
+
+#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_PICOHW, "irq3");
+    SekInterrupt(3);
+    return;
+  }
+#endif
+
+  if (PicoPicohw.fifo_bytes > 0)
+  {
+    PicoPicohw.fifo_line_bytes += fifo_bytes_line;
+    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 1
+  if (PicoPicohw.fifo_bytes_prev >= PICOHW_FIFO_IRQ_THRESHOLD &&
+      PicoPicohw.fifo_bytes < PICOHW_FIFO_IRQ_THRESHOLD) {
+    prev_line_cnt_irq3 = PicoPicohw.line_counter; // ?
+    elprintf(EL_PICOHW, "irq3, fb=%i", PicoPicohw.fifo_bytes);
+    SekInterrupt(3);
+  }
+  PicoPicohw.fifo_bytes_prev = PicoPicohw.fifo_bytes;
+#endif
+
+#if 0
+  if (PicoPicohw.line_counter - prev_line_cnt_irq5 > 512) {
+    prev_line_cnt_irq5 = PicoPicohw.line_counter;
+    elprintf(EL_PICOHW, "irq5");
+    SekInterrupt(5);
+  }
+#endif
+}
+
+static void PicoResetPico(void)
+{
+  PicoPicoPCMReset();
+  PicoPicohw.xpcm_ptr = PicoPicohw.xpcm_buffer;
+}
+
+PICO_INTERNAL void PicoInitPico(void)
+{
+  elprintf(EL_STATUS, "Pico detected");
+  PicoLineHook = PicoLinePico;
+  PicoResetHook = PicoResetPico;
+
+  PicoAHW = PAHW_PICO;
+  memset(&PicoPicohw, 0, sizeof(PicoPicohw));
+  PicoPicohw.pen_pos[0] = 0x03c + 320/2;
+  PicoPicohw.pen_pos[1] = 0x200 + 240/2;
+  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;
+  }
+}
+