[5] | 1 | /** |
---|
[8] | 2 | * The Paper Tape Project -- Punching subsystem |
---|
| 3 | * Linux backend implementation |
---|
| 4 | * |
---|
[5] | 5 | * FACIT 4070 Tape punch-75 CPS |
---|
| 6 | * Linux parallel port userspace driver (ppdev) |
---|
| 7 | * |
---|
[8] | 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. |
---|
[5] | 11 | * |
---|
[8] | 12 | * (c) 2008 Sven Köppel |
---|
[5] | 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 | |
---|
[8] | 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 */ |
---|
[5] | 30 | #include <sys/ioctl.h> |
---|
| 31 | #include <linux/ppdev.h> |
---|
| 32 | #include <linux/parport.h> |
---|
[8] | 33 | #include <sys/time.h> /* debugging */ |
---|
[5] | 34 | |
---|
[8] | 35 | int puncher_backend_mtime(long long since) { |
---|
[5] | 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 | |
---|
[8] | 45 | PuncherBackend* puncher_backend_new(int debug_flag) { |
---|
[5] | 46 | int mode; /* IEEE1284_MODE_COMAT == compatibility mode */ |
---|
[8] | 47 | PuncherBackend* c = malloc(sizeof(PuncherBackend)); |
---|
| 48 | c->debug_flag = debug_flag; |
---|
| 49 | |
---|
[5] | 50 | printf("FACIT 4070 Tape punch-75 CPS userspace driver\n"); |
---|
[8] | 51 | printf("Starting up...\n"); |
---|
[5] | 52 | |
---|
[8] | 53 | //PUNCHER_BACKEND_DPRINTF("opening device...\n"); |
---|
| 54 | c->parport_fd = open(PARPORT_DEVICE, O_RDWR); |
---|
| 55 | if(c->parport_fd == -1) { |
---|
[5] | 56 | perror("opening device failed"); |
---|
[8] | 57 | return NULL; |
---|
[5] | 58 | } |
---|
| 59 | |
---|
| 60 | /* Claim the port */ |
---|
[8] | 61 | //PUNCHER_BACKEND_DPRINTF("claiming port...\n"); |
---|
| 62 | if(ioctl(c->parport_fd, PPCLAIM)) { |
---|
[5] | 63 | perror ("claiming port (PPCLAIM)"); |
---|
[8] | 64 | close (c->parport_fd); |
---|
| 65 | return NULL; |
---|
| 66 | } |
---|
[5] | 67 | |
---|
| 68 | /* Go straight into compatibility mode: */ |
---|
[8] | 69 | //PUNCHER_BACKEND_DPRINTF("Setting compatibility mode...\n"); |
---|
[5] | 70 | mode = IEEE1284_MODE_COMPAT; |
---|
[8] | 71 | if(ioctl(c->parport_fd, PPNEGOT, &mode)) { |
---|
[5] | 72 | perror ("Setting compatibilty mode (PPNEGOT)"); |
---|
[8] | 73 | close (c->parport_fd); |
---|
| 74 | return NULL; |
---|
[5] | 75 | } |
---|
| 76 | |
---|
[8] | 77 | PUNCHER_BACKEND_DPRINTF("Waiting for Puncher beeing ready for signals...\n"); |
---|
[5] | 78 | { |
---|
| 79 | unsigned char status; |
---|
[8] | 80 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) return NULL; |
---|
[5] | 81 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
[8] | 82 | PUNCHER_BACKEND_DPRINTF("Puncher is BUSY!\n"); |
---|
[5] | 83 | usleep(8000); |
---|
| 84 | } |
---|
| 85 | } |
---|
| 86 | |
---|
[8] | 87 | PUNCHER_BACKEND_DPRINTF("Puncher ready.\n"); |
---|
| 88 | return c; |
---|
[5] | 89 | } |
---|
| 90 | |
---|
[8] | 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; |
---|
[9] | 98 | PUNCHER_BACKEND_DPRINTF("Setting null mask to control pins (strobe,etc.)...\n"); |
---|
[8] | 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; |
---|
[5] | 105 | } |
---|
| 106 | |
---|
[8] | 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; |
---|
[5] | 112 | } |
---|
[8] | 113 | close(c->parport_fd); |
---|
| 114 | PUNCHER_BACKEND_DPRINTF("Goodbye from the parport.\n"); |
---|
| 115 | return 0; |
---|
[5] | 116 | } |
---|
| 117 | |
---|
[8] | 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 | **/ |
---|
[5] | 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) { |
---|
[8] | 141 | PUNCHER_BACKEND_DPRINTF("Puncher ready to recieve (%x)\n", status); |
---|
[5] | 142 | x=-1; |
---|
| 143 | break; |
---|
| 144 | } |
---|
| 145 | usleep(10); |
---|
| 146 | }*/ |
---|
| 147 | |
---|
| 148 | /* Puncher hatte noch kein PR gesetzt. */ |
---|
| 149 | //if(x<0) |
---|
[8] | 150 | // PUNCHER_BACKEND_DPRINTF("Waited for Puncher ready (status=%x)... ", status); |
---|
[5] | 151 | |
---|
| 152 | //usleep(8000); |
---|
| 153 | /* 1/2 Sekunde ist fuer debugzwecke besser als die vorherigen 8000. */ |
---|
| 154 | //} |
---|
| 155 | |
---|
| 156 | /* set data pins */ |
---|
[8] | 157 | if(ioctl(c->parport_fd, PPWDATA, &buf)) |
---|
[5] | 158 | return -2; |
---|
[8] | 159 | time = puncher_backend_mtime(0); |
---|
[5] | 160 | |
---|
| 161 | usleep(10); // take some time... |
---|
| 162 | |
---|
| 163 | /* "pulse" strobe ==> turn off strobe! (strange behaviour) */ |
---|
[8] | 164 | if(ioctl(c->parport_fd, PPWCONTROL, &null_mask)) |
---|
[5] | 165 | return -3; |
---|
[8] | 166 | PUNCHER_BACKEND_DPRINTF("data set; strobe pulsed...\n"); |
---|
[5] | 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 */ |
---|
[8] | 173 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) |
---|
[5] | 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 * |
---|
[8] | 182 | PUNCHER_BACKEND_DPRINTF("ERROR: Punch Ready has NOT FALLEN (%x)\n",status); |
---|
[5] | 183 | usleep(5*1000); // noch mal 5ms warten. |
---|
| 184 | } else break; |
---|
| 185 | }*/ |
---|
| 186 | |
---|
| 187 | /* end strobe + data pins */ |
---|
[8] | 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; |
---|
[5] | 192 | |
---|
| 193 | /* wait untill Puncher is ready to success */ |
---|
| 194 | { |
---|
[8] | 195 | int wait = 40*1000-puncher_backend_mtime(time); // war 13*1000 |
---|
| 196 | PUNCHER_BACKEND_DPRINTF("\nWaiting for Puncher Ready (%i usec)...", wait); |
---|
[5] | 197 | if(wait>0) usleep(wait); |
---|
| 198 | } |
---|
| 199 | |
---|
[8] | 200 | if(ioctl(c->parport_fd, PPRSTATUS, &status)) return -6; |
---|
[5] | 201 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
[8] | 202 | PUNCHER_BACKEND_DPRINTF("Still busy (%x).\n", status); |
---|
[5] | 203 | return 1; |
---|
| 204 | } else { |
---|
[8] | 205 | PUNCHER_BACKEND_DPRINTF("Finished successfully (%x)\n", status); |
---|
[5] | 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) { |
---|
[8] | 219 | //PUNCHER_BACKEND_DPRINTF("%x=%x ",status1,status2); |
---|
[5] | 220 | status = status2; |
---|
| 221 | |
---|
| 222 | if((status & PARPORT_STATUS_BUSY) == PARPORT_STATUS_BUSY) { |
---|
[8] | 223 | PUNCHER_BACKEND_DPRINTF("- Puncher finished successfully (%x)\n",status); |
---|
[5] | 224 | return 0; |
---|
| 225 | } |
---|
| 226 | } |
---|
| 227 | usleep(10); |
---|
| 228 | }//for |
---|
| 229 | |
---|
[8] | 230 | PUNCHER_BACKEND_DPRINTF("Cycle passed. Still busy (%x/%x). Going on.\n",status1,status2); |
---|
[5] | 231 | |
---|
| 232 | //usleep(10000); // 20ms was |
---|
[9] | 233 | * Der Komplettintervall betraegt 13.33 Microsekunden - |
---|
[5] | 234 | * 10ms ist vielleicht angemessen |
---|
| 235 | * */ |
---|
| 236 | //} |
---|
| 237 | //return 0; |
---|
[8] | 238 | } /* puncher_backend_write_byte */ |
---|
| 239 | |
---|
| 240 | /* EOF. */ |
---|