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-rw-r--r--src/mame/audio/gridlee.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/src/mame/audio/gridlee.c b/src/mame/audio/gridlee.c
new file mode 100644
index 00000000000..5b504dd57e9
--- /dev/null
+++ b/src/mame/audio/gridlee.c
@@ -0,0 +1,172 @@
+/*************************************************************************
+
+ Basic Gridlee sound driver
+
+*************************************************************************/
+
+#include "driver.h"
+#include "streams.h"
+#include "gridlee.h"
+#include "sound/custom.h"
+#include "sound/samples.h"
+
+
+/*************************************
+ *
+ * Constants
+ *
+ *************************************/
+
+
+
+/*************************************
+ *
+ * Local variables
+ *
+ *************************************/
+
+/* tone variables */
+static UINT32 tone_step;
+static UINT32 tone_fraction;
+static UINT8 tone_volume;
+
+/* sound streaming variables */
+static sound_stream *gridlee_stream;
+static double freq_to_step;
+
+
+
+/*************************************
+ *
+ * Core sound generation
+ *
+ *************************************/
+
+static void gridlee_stream_update(void *param, stream_sample_t **inputs, stream_sample_t **outputs, int length)
+{
+ stream_sample_t *buffer = outputs[0];
+
+ /* loop over samples */
+ while (length--)
+ {
+ /* tone channel */
+ tone_fraction += tone_step;
+ *buffer++ = (tone_fraction & 0x0800000) ? (tone_volume << 6) : 0;
+ }
+}
+
+
+
+/*************************************
+ *
+ * Sound startup routines
+ *
+ *************************************/
+
+void *gridlee_sh_start(int clock, const struct CustomSound_interface *config)
+{
+ /* allocate the stream */
+ gridlee_stream = stream_create(0, 1, Machine->sample_rate, NULL, gridlee_stream_update);
+
+ freq_to_step = (double)(1 << 24) / (double)Machine->sample_rate;
+
+ return auto_malloc(1);
+}
+
+
+
+WRITE8_HANDLER( gridlee_sound_w )
+{
+static UINT8 sound_data[24];
+
+ stream_update(gridlee_stream);
+
+ switch (offset)
+ {
+ case 0x04:
+ if (data == 0xef && sound_data[offset] != 0xef)
+ sample_start(4, 1, 0);
+ else if (data != 0xef && sound_data[offset] == 0xef)
+ sample_stop(4);
+// if (!(data & 0x01) && (sound_data[offset] & 0x01))
+// sample_start(5, 1, 0);
+// else if ((data & 0x01) && !(sound_data[offset] & 0x01))
+// sample_stop(5);
+ break;
+
+ case 0x0c:
+ case 0x0d:
+ case 0x0e:
+ case 0x0f:
+ if ((data & 1) && !(sound_data[offset] & 1))
+ sample_start(offset - 0x0c, 1 - sound_data[offset - 4], 0);
+ else if (!(data & 1) && (sound_data[offset] & 1))
+ sample_stop(offset - 0x0c);
+ break;
+
+ case 0x08+0x08:
+ if (data)
+ tone_step = freq_to_step * (double)(data * 5);
+ else
+ tone_step = 0;
+ break;
+
+ case 0x09+0x08:
+ tone_volume = data;
+ break;
+
+ case 0x0b+0x08:
+// tone_volume = (data | sound_data[0x0c+0x08]) ? 0xff : 0x00;
+ break;
+
+ case 0x0c+0x08:
+// tone_volume = (data | sound_data[0x0b+0x08]) ? 0xff : 0x00;
+ break;
+
+ case 0x0d+0x08:
+// if (data)
+// tone_step = freq_to_step * (double)(data * 11);
+// else
+// tone_step = 0;
+ break;
+ }
+ sound_data[offset] = data;
+
+
+
+#if 0
+{
+static int first = 1;
+FILE *f;
+f = fopen("sound.log", first ? "w" : "a");
+first = 0;
+fprintf(f, "[%02x=%02x] %02x %02x %02x %02x %02x %02x %02x %02x - %02x %02x %02x %02x %02x %02x %02x %02x - %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ offset,data,
+ sound_data[0],
+ sound_data[1],
+ sound_data[2],
+ sound_data[3],
+ sound_data[4],
+ sound_data[5],
+ sound_data[6],
+ sound_data[7],
+ sound_data[8],
+ sound_data[9],
+ sound_data[10],
+ sound_data[11],
+ sound_data[12],
+ sound_data[13],
+ sound_data[14],
+ sound_data[15],
+ sound_data[16],
+ sound_data[17],
+ sound_data[18],
+ sound_data[19],
+ sound_data[20],
+ sound_data[21],
+ sound_data[22],
+ sound_data[23]);
+fclose(f);
+}
+#endif
+}