The sb16 audio driver has been added for OpenKernel. (There are some bugs.)

Author: OpenSoftware-World

Drivers/Sound/sb16/sb16.c

@@ -0,0 +1,81 @@
+#include "sb16.h"
+#include <OpenKernel/SystemLib/SystemIO/io.h>
+
+static sb16_t sb16;
+#define BUFFER_SIZE 8000
+uint8_t audio_buffer[BUFFER_SIZE];
+
+void sb16_write_dsp(uint8_t value) {
+    sb16_wait_ready();
+    outb(DSP_WRITE, value);
+}
+
+uint8_t sb16_read_dsp() {
+    return inb(DSP_READ);
+}
+
+int sb16_wait_ready() {
+    int timeout = 100000;
+    while (inb(DSP_STATUS) & 0x80) {
+        if (--timeout <= 0) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+int sb16_reset() {
+    outb(DSP_RESET, 1);
+    for (volatile int i = 0; i < 10000; i++);
+    outb(DSP_RESET, 0);
+    for (int i = 0; i < 100000; i++) {
+        if (inb(DSP_READ) == 0xAA) {
+            return 0;
+        }
+    }
+    return -1;
+}
+
+void sb16_set_sample_rate(uint32_t hz) {
+    sb16_wait_ready();
+    sb16_write_dsp(0x40);
+    sb16_write_dsp((hz >> 8) & 0xFF);
+    sb16_write_dsp(hz & 0xFF);
+    sb16.sample_rate = hz;
+}
+
+void sb16_play_buffer(uint8_t *data, uint32_t size) {
+    sb16_write_dsp(0x14);
+    uint32_t length = size - 1;
+    sb16_write_dsp(length & 0xFF);
+    sb16_write_dsp((length >> 8) & 0xFF);
+
+    for (uint32_t i = 0; i < size; i++) {
+        sb16_wait_ready();
+        outb(DSP_WRITE, data[i]);
+    }
+}
+
+void sb16_stop() {
+    sb16_write_dsp(0xD0);
+}
+
+void sb16_init() {
+    sb16.initialized = 0;
+    if (sb16_reset() != 0) {
+        return;
+    }
+    sb16_set_sample_rate(44100);
+    sb16.initialized = 1;
+}
+
+void sb16_gen_flat_sound(uint8_t level) {
+    for (int i = 0; i < BUFFER_SIZE; i++) {
+        audio_buffer[i] = level;
+    }
+}
+
+void sb16_test() {
+    sb16_gen_flat_sound(200);
+    sb16_play_buffer(audio_buffer, BUFFER_SIZE);
+}

Drivers/Sound/sb16/sb16.h

@@ -0,0 +1,32 @@
+#ifndef SB16_H
+#define SB16_H
+
+#include <OpenKernel/SystemLib/Std/types.h>
+
+#define SB16_BASE 0x220
+
+#define DSP_RESET (SB16_BASE + 0x6)
+#define DSP_READ (SB16_BASE + 0xA)
+#define DSP_WRITE (SB16_BASE + 0xC)
+#define DSP_STATUS (SB16_BASE + 0xE)
+
+typedef struct {
+    uint32_t sample_rate;
+    uint8_t initialized;
+} sb16_t;
+
+extern uint8_t audio_buffer[8000];
+
+void sb16_init();
+int sb16_reset();
+void sb16_set_sample_rate(uint32_t hz);
+void sb16_play_buffer(uint8_t *data, uint32_t size);
+void sb16_stop();
+
+void sb16_write_dsp(uint8_t value);
+uint8_t sb16_read_dsp();
+int sb16_wait_ready();
+void sb16_gen_flat_sound(uint8_t level);
+void sb16_test();
+
+#endif