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Fixed tone channels; made an attempt at loading PRGs that are supposed to go into RAM.

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This commit is contained in:
Thomas Harte
2016-06-13 21:49:59 -04:00
parent efcb196ef7
commit fdc854c0c2
4 changed files with 23 additions and 9 deletions
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Components/6560/6560.cpp
+11 -6
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@@ -312,30 +312,32 @@ void MOS6560::set_graphics_value(uint8_t value, uint8_t colour_value)
void MOS6560::update_audio()
{
_speaker.run_for_cycles(_cycles_since_speaker_update >> 4);
_cycles_since_speaker_update &= 15;
_speaker.run_for_cycles(_cycles_since_speaker_update >> 2);
_cycles_since_speaker_update &= 3;
}
#pragma mark - Audio
MOS6560Speaker::MOS6560Speaker()
MOS6560Speaker::MOS6560Speaker() :
_volume(0),
_control_registers{0, 0, 0, 0},
_shift_registers{0, 0, 0, 0},
_counters{0, 1, 2, 0}
{
}
void MOS6560Speaker::set_volume(uint8_t volume)
{
_volume = volume;
printf("Volume: %d\n", volume);
}
void MOS6560Speaker::set_control(int channel, uint8_t value)
{
_control_registers[channel] = value;
printf("Control %02x: %d\n", channel, value);
}
#define shift(r) _shift_registers[r] = (uint8_t)((_shift_registers[r] << 1) | (((_shift_registers[r]^0x80)&_control_registers[r]) >> 7));
#define update(r, m) _counters[r]++; if((_counters[r] >> m) == 0xff) { shift(r); _counters[r] = _control_registers[r]&0x7f; }
#define update(r, m) _counters[r]++; if((_counters[r] >> m) == 0x7f) { shift(r); _counters[r] = _control_registers[r]&0x7f; }
void MOS6560Speaker::get_samples(unsigned int number_of_samples, int16_t *target)
{
@@ -360,3 +362,6 @@ void MOS6560Speaker::skip_samples(unsigned int number_of_samples)
update(2, 0);
}
}
#undef shift
#undef update