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more audio verification.

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This commit is contained in:
Samuel Walker 2025-02-04 19:10:57 -07:00
parent e2e17ea5db
commit 76dbf7984f
Signed by: piwalker
GPG Key ID: 616B1928705EA4C9
2 changed files with 32 additions and 8 deletions
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2
include/audio.h
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@ -19,6 +19,8 @@ typedef struct {
bool ch2_dac;
bool ch4_dac;
bool ch1_len_fz;
u8 volume_left;
u8 volume_right;
bool vin_left;

38
lib/audio.c
View File

@ -6,7 +6,7 @@
#include <portaudio.h>
#include <pa_ringbuffer.h>
#define SAMPLE_RATE 192000
#define SAMPLE_RATE 44100
#define FRAMES_PER_BUFFER 64
#define TIME_PER_SAMPLE 1.0f / (SAMPLE_RATE/1000.0f/1000.0f)
#define TIME_PER_AUDIO_TICK 1.0f / (1048576.0f/1000.0f/1000.0f)
@ -18,6 +18,9 @@ static float audio_time = 0;
static float lfsr_timer = 0;
static float lfsr_clock = LFSR_BASE_CLOCK;
static float left_cap = 0.0;
static float right_cap = 0.0;
const u8 square_sample_00[8] = {
0x0,
0xF,
@ -172,8 +175,19 @@ static int audio_callback(const void* input_uffer, void *output_buffer,
if(left > 1.0f) {
printf("Uh Oh! %02X\n", ctx.volume_left);
}
*out++ = left;
*out++ = right;
bool dacs = ctx.ch1_dac || ctx.ch2_dac || ctx.ch3_dac || ctx.ch4_dac;
float left_out = 0;
float right_out = 0;
if(dacs) {
left_out = left - left_cap;
right_out = right - right_cap;
left_cap = left - left_out * 0.996;
right_cap = right - right_out * 0.996;
}
*out++ = left_out;
*out++ = right_out;
}
return paContinue;
}
@ -281,6 +295,7 @@ void audio_tick(){
if(ctx.sq1_len >= 64) {
ctx.sq1_len = 0;
ctx.sq1_enable = false;
ctx.ch1_len_fz = true;
}
}
@ -695,19 +710,26 @@ void audio_write(u16 address, u8 value){
ctx.sq1_period_reset = (ctx.sq1_period_reset & 0xF00) | value;
}
if(address == 0xFF14) {
static bool unfreeze;
if(ctx.sq1_len == 64) {
ctx.sq1_len = 0;
}
ctx.sq1_period_reset = (ctx.sq1_period_reset & 0x0FF) | ((value & 0b111) << 8);
bool len_en = (value & 0x40) == 0x40;
if((ticks % 2) == 0 && ctx.sq1_len != 0 && !ctx.sq1_len_enable && len_en){
if((ticks % 2) == 0 && !ctx.ch1_len_fz && !ctx.sq1_len_enable && len_en){
ctx.sq1_len++;
if(ctx.sq1_len >= 64) {
ctx.sq1_len = 0;
ctx.sq1_enable = false;
ctx.ch1_len_fz = true;
}
}
if((ticks % 2) == 0 && ctx.ch1_len_fz && (value & 0x80) == 0x80){
ctx.ch1_len_fz = false;
if(len_en){
ctx.sq1_len++;
}
}
} else if(ctx.sq1_len == 0 && (value & 0x80) == 0x80){
printf("Value: %02X\n", value);
ctx.sq1_len = 1;
}
ctx.sq1_len_enable = len_en;
if(value & 0x80) {
enable_square1();