test,am-tests: add audio test

tests/am-tests/Makefile

@@ -1,3 +1,3 @@
 NAME = amtest
-SRCS = $(shell find src/ -name "*.c")
+SRCS = $(shell find src/ -name "*.[cS]")
 include $(AM_HOME)/Makefile

tests/am-tests/src/main.c

@@ -11,6 +11,7 @@ static const char *tests[256] = {
   ['t'] = "real-time clock test",
   ['k'] = "readkey test",
   ['v'] = "display test",
+  ['a'] = "audio test",
   ['p'] = "x86 virtual memory test",
 };
 
@@ -23,6 +24,7 @@ int main(const char *args) {
     CASE('t', rtc_test, IOE);
     CASE('k', keyboard_test, IOE);
     CASE('v', video_test, IOE);
+    CASE('a', audio_test, IOE);
     CASE('p', vm_test, CTE(vm_handler), VME(simple_pgalloc, simple_pgfree));
     case 'H':
     default:

tests/am-tests/src/tests/audio.c

@@ -0,0 +1,27 @@
+#include <amtest.h>
+
+void audio_test() {
+  if (!io_read(AM_AUDIO_CONFIG).present) {
+    printf("WARNING: %s does not support audio\n", TOSTRING(__ARCH__));
+    return;
+  }
+
+  io_write(AM_AUDIO_CTRL, 8000, 1, 1024, 8192);
+
+  extern uint8_t audio_payload, audio_payload_end;
+  uint32_t audio_len = &audio_payload_end - &audio_payload;
+  int nplay = 0;
+  Area sbuf;
+  sbuf.start = &audio_payload;
+  while (nplay < audio_len) {
+    int len = (audio_len - nplay > 4096 ? 4096 : audio_len - nplay);
+    sbuf.end = sbuf.start + len;
+    io_write(AM_AUDIO_PLAY, sbuf);
+    sbuf.start += len;
+    nplay += len;
+    printf("Already play %d/%d bytes of data\n", nplay, audio_len);
+  }
+
+  // wait until the audio finishes
+  while (io_read(AM_AUDIO_STATUS).count > 0);
+}

tests/am-tests/src/tests/audio/audio-data.S

@@ -0,0 +1,6 @@
+.section .data
+.global audio_payload, audio_payload_end
+.p2align 3
+audio_payload:
+.incbin "src/tests/audio/little-star.pcm"
+audio_payload_end: