1 | /** |
---|
2 | * The Paper Tape Project -- Punching subsystem |
---|
3 | * Linux backend implementation |
---|
4 | * |
---|
5 | * FACIT 4070 Tape punch-75 CPS |
---|
6 | * Linux parallel port userspace driver (ppdev) |
---|
7 | * |
---|
8 | * This driver assumes the Linux kernel module "ppdev" |
---|
9 | * being loaded and PARPORT_DEVICE (see symbol below) |
---|
10 | * being writable for the current UID. |
---|
11 | * |
---|
12 | * (c) 2008 Sven Köppel |
---|
13 | * |
---|
14 | **/ |
---|
15 | |
---|
16 | #include <stdio.h> |
---|
17 | #include <stdlib.h> |
---|
18 | #include <unistd.h> |
---|
19 | #include <fcntl.h> /* lowlevel io */ |
---|
20 | #include <errno.h> |
---|
21 | #include <stdarg.h> /* var argument list */ |
---|
22 | #include <math.h> |
---|
23 | |
---|
24 | #include "backend.h" |
---|
25 | #define PARPORT_DEVICE "/dev/parport0" |
---|
26 | #define PUNCHER_BACKEND_DPRINTF(bla...) { if(c->debug_flag) fprintf(stderr,bla); } |
---|
27 | |
---|
28 | |
---|
29 | /* Linux specific header files */ |
---|
30 | #include <sys/ioctl.h> |
---|
31 | #include <linux/ppdev.h> |
---|
32 | #include <linux/parport.h> |
---|
33 | #include <sys/time.h> /* debugging */ |
---|
34 | |
---|
35 | int puncher_backend_mtime(long long since) { |
---|
36 | /* gibt millisekunden zurueck seit since. since sind dabei die |
---|
37 | Millisekunden seit der Unix-Epoche. Ein initiales since kann |
---|
38 | per mtime(0) gefunden werden. */ |
---|
39 | struct timeval time; |
---|
40 | gettimeofday(&time, NULL); |
---|
41 | // Sec*10^6 |
---|
42 | return (time.tv_sec * 1000000 + time.tv_usec) - since; |
---|
43 | } |
---|
44 | |
---|
45 | PuncherBackend* puncher_backend_new(int debug_flag) { |
---|
46 | int mode; /* IEEE1284_MODE_COMAT == compatibility mode */ |
---|
47 | PuncherBackend* c = malloc(sizeof(PuncherBackend)); |
---|
48 | c->debug_flag = debug_flag; |
---|
49 | |
---|
50 | printf("FACIT 4070 Tape punch-75 CPS userspace driver\n"); |
---|
51 | printf("Starting up...\n"); |
---|
52 | |
---|
53 | //PUNCHER_BACKEND_DPRINTF("opening device...\n"); |
---|
54 | c->parport_fd = open(PARPORT_DEVICE, O_RDWR); |
---|
55 | if(c->parport_fd == -1) { |
---|
56 | perror("opening device failed"); |
---|
57 | return NULL; |
---|
58 | } |
---|
59 | |
---|
60 | /* Claim the port */ |
---|
61 | //PUNCHER_BACKEND_DPRINTF("claiming port...\n"); |
---|
62 | if(ioctl(c->parport_fd, PPCLAIM)) { |
---|
63 | perror ("claiming port (PPCLAIM)"); |
---|
64 | close (c->parport_fd); |
---|
65 | return NULL; |
---|
66 | } |
---|
67 | |
---|
68 | /* Go straight into compatibility mode: */ |
---|
69 | //PUNCHER_BACKEND_DPRINTF("Setting compatibility mode...\n"); |
---|
70 | mode = IEEE1284_MODE_COMPAT; |
---|
71 | if(ioctl(c->parport_fd, PPNEGOT, &mode)) { |
---|
72 | perror ("Setting compatibilty mode (PPNEGOT)"); |
---|
73 | close (c->parport_fd); |
---|
74 | return NULL; |
---|
75 | } |
---|
76 | |
---|
77 | PUNCHER_BACKEND_DPRINTF("Waiting for Puncher beeing ready for signals...\n"); |
---|
78 | { |
---|
79 | unsigned char status; |
---|
80 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) return NULL; |
---|
81 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
82 | PUNCHER_BACKEND_DPRINTF("Puncher is BUSY!\n"); |
---|
83 | usleep(8000); |
---|
84 | } |
---|
85 | } |
---|
86 | |
---|
87 | PUNCHER_BACKEND_DPRINTF("Puncher ready.\n"); |
---|
88 | return c; |
---|
89 | } |
---|
90 | |
---|
91 | int puncher_backend_emergency_stop(PuncherBackend* c) { |
---|
92 | /** |
---|
93 | * This method implements the setoff-strobe mechanism. |
---|
94 | * It should be called whenever you want the puncher simply to |
---|
95 | * *stop*. |
---|
96 | **/ |
---|
97 | static unsigned char mask = PARPORT_CONTROL_STROBE; |
---|
98 | PUNCHER_BACKEND_DPRINTF("Setting null mask to control pins (strobe,etc.)...\n"); |
---|
99 | if(ioctl(c->parport_fd, PPWCONTROL, &mask)) { |
---|
100 | perror("backend emergency exit: null mask"); |
---|
101 | close(c->parport_fd); |
---|
102 | return 1; |
---|
103 | } |
---|
104 | return 0; |
---|
105 | } |
---|
106 | |
---|
107 | int puncher_backend_destroy(PuncherBackend* c) { |
---|
108 | puncher_backend_emergency_stop(c); // stop it. |
---|
109 | if(ioctl(c->parport_fd, PPRELEASE)) { |
---|
110 | perror ("Releasing the parport"); |
---|
111 | return 1; |
---|
112 | } |
---|
113 | close(c->parport_fd); |
---|
114 | PUNCHER_BACKEND_DPRINTF("Goodbye from the parport.\n"); |
---|
115 | return 0; |
---|
116 | } |
---|
117 | |
---|
118 | |
---|
119 | |
---|
120 | int puncher_backend_write_byte(PuncherBackend* c, unsigned char buf) { |
---|
121 | /** |
---|
122 | * This will write one byte on the puncher. Return |
---|
123 | * values: |
---|
124 | * r < 0 => Failure Error (see errno) |
---|
125 | * r == 0 => Perfect write, no error |
---|
126 | * r == 1 => After writing still "busy" signal (continue, anywhere) |
---|
127 | **/ |
---|
128 | static unsigned char strobe_on = (PARPORT_CONTROL_STROBE); |
---|
129 | static unsigned char null_mask = 0x00; |
---|
130 | unsigned char status; |
---|
131 | long long time; |
---|
132 | |
---|
133 | /* (falls nötig) warten bis PR (Punch ready == busy) kommt */ |
---|
134 | /*for(;;) *///{ |
---|
135 | /*int x; |
---|
136 | for(x=0;x<5;x++) { |
---|
137 | if(ioctl(fd, PPRSTATUS, &status)) |
---|
138 | return -1; |
---|
139 | |
---|
140 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
141 | PUNCHER_BACKEND_DPRINTF("Puncher ready to recieve (%x)\n", status); |
---|
142 | x=-1; |
---|
143 | break; |
---|
144 | } |
---|
145 | usleep(10); |
---|
146 | }*/ |
---|
147 | |
---|
148 | /* Puncher hatte noch kein PR gesetzt. */ |
---|
149 | //if(x<0) |
---|
150 | // PUNCHER_BACKEND_DPRINTF("Waited for Puncher ready (status=%x)... ", status); |
---|
151 | |
---|
152 | //usleep(8000); |
---|
153 | /* 1/2 Sekunde ist fuer debugzwecke besser als die vorherigen 8000. */ |
---|
154 | //} |
---|
155 | |
---|
156 | /* set data pins */ |
---|
157 | if(ioctl(c->parport_fd, PPWDATA, &buf)) |
---|
158 | return -2; |
---|
159 | time = puncher_backend_mtime(0); |
---|
160 | |
---|
161 | usleep(10); // take some time... |
---|
162 | |
---|
163 | /* "pulse" strobe ==> turn off strobe! (strange behaviour) */ |
---|
164 | if(ioctl(c->parport_fd, PPWCONTROL, &null_mask)) |
---|
165 | return -3; |
---|
166 | PUNCHER_BACKEND_DPRINTF("data set; strobe pulsed...\n"); |
---|
167 | |
---|
168 | /* Puncher: PI (=strobe) minimum == 100us */ |
---|
169 | usleep(220); // DTL TRY |
---|
170 | // was: 220 => wir gehen jetzt auf 2ms |
---|
171 | |
---|
172 | /* check if Punch Ready has fallen */ |
---|
173 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) |
---|
174 | return -4; |
---|
175 | // bringts ja eh nicht -- also lassen. |
---|
176 | |
---|
177 | /*for(;;) { |
---|
178 | if(ioctl(fd, PPRSTATUS, &status)) |
---|
179 | return -4; |
---|
180 | if((status & PARPORT_STATUS_BUSY) != PARPORT_STATUS_BUSY) { |
---|
181 | * it has not - quite bad, but we will continue * |
---|
182 | PUNCHER_BACKEND_DPRINTF("ERROR: Punch Ready has NOT FALLEN (%x)\n",status); |
---|
183 | usleep(5*1000); // noch mal 5ms warten. |
---|
184 | } else break; |
---|
185 | }*/ |
---|
186 | |
---|
187 | /* end strobe + data pins */ |
---|
188 | PUNCHER_BACKEND_DPRINTF("Control is %x. Ending data pins... ",status); |
---|
189 | if(ioctl(c->parport_fd, PPWDATA, &null_mask)) return -5; |
---|
190 | PUNCHER_BACKEND_DPRINTF("+ strobe... "); |
---|
191 | if(ioctl(c->parport_fd, PPWCONTROL, &strobe_on)) return -5; |
---|
192 | |
---|
193 | /* wait untill Puncher is ready to success */ |
---|
194 | { |
---|
195 | int wait = 40*1000-puncher_backend_mtime(time); // war 13*1000 |
---|
196 | PUNCHER_BACKEND_DPRINTF("\nWaiting for Puncher Ready (%i usec)...", wait); |
---|
197 | if(wait>0) usleep(wait); |
---|
198 | } |
---|
199 | |
---|
200 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) return -6; |
---|
201 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
202 | PUNCHER_BACKEND_DPRINTF("Still busy (%x).\n", status); |
---|
203 | return 1; |
---|
204 | } else { |
---|
205 | PUNCHER_BACKEND_DPRINTF("Finished successfully (%x)\n", status); |
---|
206 | return 0; |
---|
207 | } |
---|
208 | |
---|
209 | |
---|
210 | //for(;;) { |
---|
211 | /* |
---|
212 | int x; |
---|
213 | unsigned char status1,status2; |
---|
214 | for(x=0;x<(100);x++) { |
---|
215 | if(ioctl(fd, PPRSTATUS, &status1)) return -6; |
---|
216 | usleep(15); |
---|
217 | if(ioctl(fd, PPRSTATUS, &status2)) return -6; |
---|
218 | if(status1 == status2) { |
---|
219 | //PUNCHER_BACKEND_DPRINTF("%x=%x ",status1,status2); |
---|
220 | status = status2; |
---|
221 | |
---|
222 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
223 | PUNCHER_BACKEND_DPRINTF("- Puncher finished successfully (%x)\n",status); |
---|
224 | return 0; |
---|
225 | } |
---|
226 | } |
---|
227 | usleep(10); |
---|
228 | }//for |
---|
229 | |
---|
230 | PUNCHER_BACKEND_DPRINTF("Cycle passed. Still busy (%x/%x). Going on.\n",status1,status2); |
---|
231 | |
---|
232 | //usleep(10000); // 20ms was |
---|
233 | * Der Komplettintervall betraegt 13.33 Microsekunden - |
---|
234 | * 10ms ist vielleicht angemessen |
---|
235 | * */ |
---|
236 | //} |
---|
237 | //return 0; |
---|
238 | } /* puncher_backend_write_byte */ |
---|
239 | |
---|
240 | /* EOF. */ |
---|