From 98a12dd92057cf204a48ef70c26fd46d65be9f76 Mon Sep 17 00:00:00 2001
From: oniku_taro <oppyoko@gmail.com>
Date: Wed, 24 Feb 2021 02:38:10 +0900
Subject: [PATCH] source codes

---
 system573_lib/ksys573_sio.c | 34 ----------------------------
 system573_lib/ksys573_sio.h | 45 +------------------------------------
 2 files changed, 1 insertion(+), 78 deletions(-)

diff --git a/system573_lib/ksys573_sio.c b/system573_lib/ksys573_sio.c
index 4dace5d..4b9bfea 100644
--- a/system573_lib/ksys573_sio.c
+++ b/system573_lib/ksys573_sio.c
@@ -1,41 +1,10 @@
-/*
- * SIO communication library for PSXSDK.
- * Originally written by Shendo.
- * Thanks to Martin Korth of the NO$PSX for documentation.
- * 
- * This library is accessing SIO registers directly, no BIOS routines are used.
- */
-
 #include <psx.h>
 #include "ksys573_sio.h"
 #include <stdio.h>
 #include "ksys573_psx_gpu.h"
 
-void SIOStart(int bitrate)
-{
-	/*Set to 8N1 mode with desired bitrate*/
-	SIOStartEx(bitrate, SIO_DATA_LEN_8, SIO_PARITY_NONE, SIO_STOP_BIT_1);
-}
-
-void SIOStartEx(int bitrate, int datalength, int parity, int stopbit)
-{
-	/*Set SIO_MODE register, bitrate reload factor set to MUL16 by default*/
-	SIO_MODE = SIO_REL_MUL16 | (datalength << 2) | (parity << 4) | (stopbit << 6);
-
-	/*Reset SIO_CTRL register.*/
-	SIO_CTRL = 0;
-
-	/*Set TX and RT to enabled, no handshaking signals.*/
-	SIO_CTRL = 1 | (1 << 2);
-
-	/*Calculate bitrate reload value based on the given bitrate
-	 * Reload = SystemClock (33 Mhz) / (Factor (MULI16) * bitrate)*/
-	SIO_BPSV = 0x204CC00 / (16 * bitrate);
-}
-
 void SIOStop()
 {
-	/*Set all SIO related registers to zero*/
 	SIO_MODE = 0;
 	SIO_CTRL = 0;
 	SIO_BPSV = 0;
@@ -79,19 +48,16 @@ int SIOSendByte_wait_txen(unsigned char data,int timeout)
 
 int SIOCheckInBuffer()
 {
-	/*Return status of RX FIFO*/
 	return (SIO_STAT & 0x2)>0;
 }
 
 int SIOCheckOutBuffer()
 {
-	/*Return status of TX Ready flag*/
 	return (SIO_STAT & 0x4)>0;
 }
 	
 void SIOStart_Ksys573()
 {
-	/*Set all SIO related registers to zero*/
 	SIO_MODE = 0x004e;
 	SIO_CTRL = 0x0c37;
 	SIO_BPSV = 0x0012;
diff --git a/system573_lib/ksys573_sio.h b/system573_lib/ksys573_sio.h
index c8a410d..673f72a 100644
--- a/system573_lib/ksys573_sio.h
+++ b/system573_lib/ksys573_sio.h
@@ -65,55 +65,12 @@ enum sio_parity
 #define SIO_BPSV		*((volatile unsigned short*)0x1F80105E)
 
 
-/**
- * Initialize SIO communication at the specified bitrate (baud rate).
- * Mode is 8N1. (Data Length = 8 bit, No parity, Stop bit Length = 1 bit)
- * @param bitrate Bitrate (baud rate)
- */
-void SIOStart(int bitrate);
-
-/**
- * Same as SIOStart() but with more control.
- * IMPORTANT: Must use defined macros.
- * For example setting datalength to 5 should be done with "SIO_DATA_LEN_5"
- * and not by simply passing 5 as an argument.
- *
- * @param bitrate Bit rate (baud rate)
- * @param datalength Character (data) length
- * @param parity Parity
- * @param stopbit Stop bit length
- */
-void SIOStartEx(int bitrate, int datalength, int parity, int stopbit);
-
-/**
- * Shuts down SIO communication.
- */
 void SIOStop(void);
 
-/**
- * Read a single byte from the input buffer.
- * @return Data byte from input buffer
- */
+
 unsigned char SIOReadByte(void);
-
-/**
- * Send a single byte to the output buffer.
- * @param data Byte to send
- */
 void SIOSendByte(unsigned char data);
-
-/**
- * Check if any data is waiting in the input buffer.
- * Must be used when fetching data otherwise incorrect data could be read (usually 0x00).
- * @return Non-zero if there is data waiting in the input buffer, zero otherwise.
- */
 int SIOCheckInBuffer(void);
-
-/**
- * Check if port is ready to send data (previous operation finished).
- * Must be used when sending data as the output buffer is only 2 bytes long.
- * @return Non-zero if port is ready to send data, zero otherwise.
- */
 int SIOCheckOutBuffer(void);
 unsigned short SIOSTATUS(void);
 void SIOtest(void);