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/* Copyright (c) 2000, Timothy Mann */
/* This software may be copied, modified, and used for any purpose
* without fee, provided that (1) the above copyright notice is
* retained, and (2) modified versions are clearly marked as having
* been modified, with the modifier's name and the date included. */
/* Last modified on Thu May 18 00:42:46 PDT 2000 by mann */
/*
* Emulation of the Radio Shack TRS-80 Model I/III/4/4P serial port.
*/
#include <errno.h>
#include "trs.h"
#include "trs_hard.h"
extern void trs_uart_init(int reset_button);
extern int trs_uart_check_avail();
extern int trs_uart_modem_in();
extern void trs_uart_reset_out(int value);
extern int trs_uart_switches_in();
extern void trs_uart_baud_out(int value);
extern int trs_uart_status_in();
extern void trs_uart_control_out(int value);
extern int trs_uart_data_in();
extern void trs_uart_data_out(int value);
extern char *trs_uart_name;
extern int trs_uart_switches;
#define TRS_UART_MODEM 0xE8 /* in */
#define TRS_UART_RESET 0xE8 /* out */
#define TRS_UART_SWITCHES 0xE9 /* in, model I only */
#define TRS_UART_BAUD 0xE9 /* out */
#define TRS_UART_STATUS 0xEA /* in */
#define TRS_UART_CONTROL 0xEA /* out */
#define TRS_UART_DATA 0xEB /* in/out */
/* Bits in TRS_UART_MODEM port */
#define TRS_UART_CTS 0x80
#define TRS_UART_DSR 0x40
#define TRS_UART_CD 0x20
#define TRS_UART_RI 0x10
#define TRS_UART_RCVIN 0x02
/* Bits in TRS_UART_BAUD port */
#define TRS_UART_SNDBAUD(v) (((v)&0xf0)>>4)
#define TRS_UART_RCVBAUD(v) (((v)&0x0f)>>0)
#define TRS_UART_50 0x00
#define TRS_UART_75 0x01
#define TRS_UART_110 0x02
#define TRS_UART_134 0x03
#define TRS_UART_150 0x04
#define TRS_UART_300 0x05
#define TRS_UART_600 0x06
#define TRS_UART_1200 0x07
#define TRS_UART_1800 0x08
#define TRS_UART_2000 0x09
#define TRS_UART_2400 0x0a
#define TRS_UART_3600 0x0b
#define TRS_UART_4800 0x0c
#define TRS_UART_7200 0x0d
#define TRS_UART_9600 0x0e
#define TRS_UART_19200 0x0f
#define TRS_UART_BAUD_TABLE \
{ 50.0, 75.0, 110.0, 134.5, 150.0, 300.0, 600.0, 1200.0, 1800.0, \
2000.0, 2400.0, 3600.0, 4800.0, 7200.0, 9600.0, 19200.0 }
/* Bits in TRS_UART_STATUS port */
#define TRS_UART_RCVD 0x80
#define TRS_UART_SENT 0x40
#define TRS_UART_OVRERR 0x20
#define TRS_UART_FRMERR 0x10
#define TRS_UART_PARERR 0x08
/* Bits in TRS_UART_CONTROL port */
#define TRS_UART_EVENPAR 0x80
#define TRS_UART_WORDMASK 0x60
#define TRS_UART_WORD5 0x00
#define TRS_UART_WORD6 0x40
#define TRS_UART_WORD7 0x20
#define TRS_UART_WORD8 0x60
#define TRS_UART_WORDBITS(v) (((v)&TRS_UART_WORDMASK)>>5)
#define TRS_UART_WORDBITS_TABLE { 5, 7, 6, 8 }
#define TRS_UART_STOP2 0x10
#define TRS_UART_NOPAR 0x08
#define TRS_UART_NOTBREAK 0x04
#define TRS_UART_DTR 0x02 /* mislabelled as RTS in Model I manual */
#define TRS_UART_RTS 0x01 /* mislabelled as DTR in Model I manual */
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