1/* 2 * Copyright 2008, Haiku, Inc. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * François Revol, revol@free.fr 7 * 8 * Copyright 2005, François Revol. 9 */ 10 11/* 12 Description: Implements a tty on top of the parallel port, 13 using PLIP-like byte-by-byte protocol. 14 Low level stuff. 15*/ 16 17 18// LPT1 19#define LPTBASE 0x378 20#define LPTIRQ 7 21#define LPTDONGLE "/dev/misc/dongle/parallel1" 22#define LPTSPIN 30 23#define LPTSOFTRIES 1000 24#define LPTNIBTRIES 100 25#define LAPLINK_MAX_FRAME 512 26 27typedef struct laplink_state { 28 int32 port; 29 int32 irq; 30 31 uint8 rstate; 32 uint8 wstate; 33} laplink_state; 34 35// framing 36extern status_t ll_send_sof(laplink_state *st); 37extern status_t ll_check_sof(laplink_state *st); 38extern status_t ll_ack_sof(laplink_state *st); 39extern status_t ll_send_eof(laplink_state *st); 40 41// nibbles 42extern status_t ll_send_lnibble(laplink_state *st, uint8 v); 43extern status_t ll_send_mnibble(laplink_state *st, uint8 v); 44extern status_t ll_wait_lnibble(laplink_state *st, uint8 *v); 45extern status_t ll_wait_mnibble(laplink_state *st, uint8 *v); 46 47// byte mode 48extern status_t ll_send_byte(laplink_state *st, uint8 v); 49extern status_t ll_check_byte(laplink_state *st, uint8 *v); 50extern status_t ll_wait_byte(laplink_state *st, uint8 *v); 51 52// frame mode 53extern status_t ll_send_frame(laplink_state *st, const uint8 *buff, size_t *len); 54extern status_t ll_check_frame(laplink_state *st, uint8 *buff, size_t *len); 55extern status_t ll_wait_frame(laplink_state *st, uint8 *buff, size_t *len); 56 57 58