From ef776e728cfa67fbca38bb375152b336fa0b5200 Mon Sep 17 00:00:00 2001
From: spicyjpeg <88942473+spicyjpeg@users.noreply.github.com>
Date: Mon, 27 Jun 2022 22:18:11 +0200
Subject: Clean up io/system573 example and libpsxpress

---
 examples/io/system573/k573io.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'examples/io/system573/k573io.c')

diff --git a/examples/io/system573/k573io.c b/examples/io/system573/k573io.c
index bc13852..53c109f 100644
--- a/examples/io/system573/k573io.c
+++ b/examples/io/system573/k573io.c
@@ -75,7 +75,7 @@ uint32_t K573_GetJAMMAInputs(void) {
 	inputs |= ((K573_IO_CHIP[IO_REG_IN1_HIGH] >> 8) & 0x1f) << 24;
 	inputs |=  (K573_IO_CHIP[IO_REG_IN1_LOW]        & 0x07) << 29;
 
-	return inputs;
+	return ~inputs;
 }
 
 void K573_SetLights(uint32_t lights) {
@@ -120,5 +120,10 @@ void K573_Init(void) {
 	EXP1_ADDR       = 0x1f000000;
 	EXP1_DELAY_SIZE = 0x24173f47; // 573 BIOS uses this value
 
+	// Bit 6 of this register controls the audio DAC and must be set, otherwise
+	// no sound will be output. Most of the other bits are data clocks/strobes
+	// and should be pulled high when not in use.
+	K573_IO_CHIP[IO_REG_OUT0] = 0x01e7;
+
 	K573_RESET_WATCHDOG();
 }
-- 
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