diff options
Diffstat (limited to 'src/mame/audio/gridlee.c')
-rw-r--r-- | src/mame/audio/gridlee.c | 172 |
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 +} |