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Made a complete attempt at the tone channels.

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This commit is contained in:
Thomas Harte 2016-06-13 20:59:01 -04:00
parent f1a45c1011
commit efcb196ef7
2 changed files with 33 additions and 10 deletions
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35
Components/6560/6560.cpp
View File

@ -57,7 +57,7 @@ MOS6560::MOS6560() :
// show the middle 90%
_crt->set_visible_area(Outputs::CRT::Rect(0.05f, 0.05f, 0.9f, 0.9f));
_speaker.set_input_rate(63920.4375); // assuming NTSC; clock rate / 16
_speaker.set_input_rate(255681.75); // assuming NTSC; clock rate / 4
}
void MOS6560::set_register(int address, uint8_t value)
@ -312,7 +312,7 @@ 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);
_speaker.run_for_cycles(_cycles_since_speaker_update >> 4);
_cycles_since_speaker_update &= 15;
}
@ -324,22 +324,39 @@ MOS6560Speaker::MOS6560Speaker()
void MOS6560Speaker::set_volume(uint8_t volume)
{
// printf("Volume is %d\n", volume);
_volume = volume;
printf("Volume: %d\n", volume);
}
void MOS6560Speaker::set_control(int channel, uint8_t volume)
void MOS6560Speaker::set_control(int channel, uint8_t value)
{
// NTSC: 1022727
//N: bass switch, R: freq f=Phi2/256/(255-$900a) NTSC: Phi2=14318181/14 Hz
//O: alto switch, S: freq f=Phi2/128/(255-$900b) PAL: Phi2=4433618/4 Hz
//P: soprano switch, T: freq f=Phi2/64/(255-$900c)
//Q: noise switch, U: freq f=Phi2/32/(255-$900d)
_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; }
void MOS6560Speaker::get_samples(unsigned int number_of_samples, int16_t *target)
{
// - $900d: cpuclock/32 (?)
for(unsigned int c = 0; c < number_of_samples; c++)
{
update(0, 2);
update(1, 1);
update(2, 0);
target[c] = ((_shift_registers[0]&1) + (_shift_registers[1]&1) + (_shift_registers[2]&1)) * _volume * 700;
}
}
void MOS6560Speaker::skip_samples(unsigned int number_of_samples)
{
for(unsigned int c = 0; c < number_of_samples; c++)
{
update(0, 2);
update(1, 1);
update(2, 0);
}
}

8
Components/6560/6560.hpp
View File

@ -19,10 +19,16 @@ class MOS6560Speaker: public ::Outputs::Filter<MOS6560Speaker> {
MOS6560Speaker();
void set_volume(uint8_t volume);
void set_control(int channel, uint8_t volume);
void set_control(int channel, uint8_t value);
void get_samples(unsigned int number_of_samples, int16_t *target);
void skip_samples(unsigned int number_of_samples);
private:
unsigned int _counters[4];
uint8_t _shift_registers[4];
uint8_t _control_registers[4];
uint8_t _volume;
};
class MOS6560 {