console.c

   1 /* $Id: console.c,v 1.5 2010/07/25 20:40:44 simimeie Exp $
   2  * Functions for a serial console.
   3  */
   4
   5 #include <avr/io.h>
   6 #include <avr/interrupt.h>
   7 #include <avr/pgmspace.h>
   8 #include <avr/version.h>
   9 #include <avr/wdt.h>
  10 #include <util/delay.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include "console.h"
  14 #include "ledpwm.h"
  15 #include "rfm12.h"
  16
  17 /* PD0 is RXD, PD1 is TXD, but we don't need to address them manually */
  18
  19 /* Formula for calculating the value of UBRR from baudrate and cpufreq */
  20 #define UBRRCALC ((CPUFREQ / (16 * BAUDRATE)) - 1)
  21
  22 #define INPUTBUFSIZE 30
  23 static uint8_t inputbuf[INPUTBUFSIZE];
  24 static uint8_t inputpos = 0;
  25 #define OUTPUTBUFSIZE 400
  26 static uint8_t outputbuf[OUTPUTBUFSIZE];
  27 static uint16_t outputhead = 0; /* WARNING cannot be modified atomically */
  28 static uint16_t outputtail = 0;
  29 static uint8_t opinprog = 0;
  30 static uint8_t escstatus = 0;
  31 static prog_uint8_t CRLF[] = "\r\n";
  32 static prog_uint8_t WELCOMEMSG[] = "\r\n"\
  33                                    "\r\n ******************************************"\
  34                                    "\r\n * HaWo Moodlight v0 (prototype)          *"\
  35                                    "\r\n * (C) Michael 'PoempelFox' Meier 06/2010 *"\
  36                                    "\r\n ******************************************"\
  37                                    "\r\n"\
  38                                    "\r\nProcessor: atmega328"\
  39                                    "\r\nAVR-libc: " __AVR_LIBC_VERSION_STRING__ " (" __AVR_LIBC_DATE_STRING__ ")"\
  40                                    "\r\nSoftware Version 0.1, Compiled " __DATE__ " " __TIME__;
  41 static prog_uint8_t PROMPT[] = "\r\nroot@moodlight# ";
  42
  43 uint8_t mcusr_mirror __attribute__ ((section (".noinit")));
  44
  45 /* This is needed to recover from a watchdog reset, as the watchdog
  46  * stays active after the reset.
  47  * The variable is just to make the reason of the last reset accessible
  48  * later. */
  49 void get_mcusr(void) __attribute__((naked)) __attribute__((section(".init3")));
  50 void get_mcusr(void) {
  51   mcusr_mirror = MCUSR;
  52   MCUSR = 0;
  53   wdt_disable();
  54 }
  55
  56 /* Handler for TXC (TX Complete) IRQ */
  57 ISR(USART_TX_vect) {
  58         if (outputhead == outputtail) { /* Nothing more to send! */
  59                 opinprog = 0;
  60         } else {
  61                 UDR0 = outputbuf[outputhead];
  62                 outputhead++;
  63                 if (outputhead >= OUTPUTBUFSIZE) {
  64                         outputhead = 0;
  65                 }
  66         }
  67 }
  68
  69 #if defined __GNUC__
  70 /* Unfortunately, gcc is very very dumb, and despite -Os tries to inline this
  71  * function even though it is called about a thousand times, when only
  72  * NETCONSOLE is defined, costing us more than 2.5 KiloBytes of Flash.
  73  * Way to go, gcc "optimization". Though NETCONSOLE does not exist
  74  * in this copy of the console code, it certainly can't hurt. */
  75 static void appendchar(uint8_t what) __attribute__((noinline));
  76 #endif /* __GNUC__ */
  77 /* This can only be called safely with interrupts disabled - remember that! */
  78 static void appendchar(uint8_t what) {
  79   uint16_t newpos;
  80   newpos = (outputtail + 1);
  81   if (newpos >= OUTPUTBUFSIZE) {
  82     newpos = 0;
  83   }
  84   if (newpos != outputhead) {
  85     outputbuf[outputtail] = what;
  86     outputtail = newpos;
  87   }
  88   if (!opinprog) {
  89     /* Send the byte */
  90     UDR0 = what;
  91     outputhead++;
  92     if (outputhead >= OUTPUTBUFSIZE) {
  93       outputhead = 0;
  94     }
  95     opinprog = 1;
  96   }
  97 }
  98
  99 void console_printchar_noirq(uint8_t what) {
 100   appendchar(what);
 101 }
 102
 103 /* This can only be called safely with interrupts disabled - remember that! */
 104 void console_printhex8_noirq(uint8_t what) {
 105         uint8_t buf;
 106         uint8_t i;
 107         for (i=0; i<2; i++) {
 108                 buf = (uint8_t)(what & (uint8_t)0xF0) >> 4;
 109                 if (buf <= 9) {
 110                         buf += '0';
 111                 } else {
 112                         buf += 'A' - 10;
 113                 }
 114                 appendchar(buf);
 115                 what <<= 4;
 116         }
 117 }
 118
 119 /* This can only be called safely with interrupts disabled - remember that! */
 120 void console_printdec_noirq(uint8_t what) {
 121   uint8_t buf;
 122   buf = what / 100;
 123   appendchar(buf + '0');
 124   what %= 100;
 125   buf = what / 10;
 126   appendchar(buf + '0');
 127   buf = what % 10;
 128   appendchar(buf + '0');
 129 }
 130
 131 /* This can only be called safely with interrupts disabled - remember that! */
 132 void console_printbin8_noirq(uint8_t what) {
 133         uint8_t i;
 134         for (i = 0; i < 8; i++) {
 135                 if (what & 0x80) {
 136                         appendchar('1');
 137                 } else {
 138                         appendchar('0');
 139                 }
 140                 what <<= 1;
 141         }
 142 }
 143
 144 /* This can only be called safely with interrupts disabled - remember that! */
 145 static void console_printtext_noirq(const uint8_t * what) {
 146         while (*what) {
 147                 appendchar(*what);
 148                 what++;
 149         }
 150 }
 151
 152 /* This can only be called safely with interrupts disabled - remember that! */
 153 static void console_printpgm_noirq_P(PGM_P what) {
 154         uint8_t t;
 155         while ((t = pgm_read_byte(what++))) {
 156                 appendchar(t);
 157         }
 158 }
 159
 160 /* These are wrappers for our internal functions, disabling IRQs before
 161  * calling them. */
 162 void console_printtext(const uint8_t * what) {
 163         cli();
 164         console_printtext_noirq(what);
 165         sei();
 166 }
 167
 168 void console_printpgm_P(PGM_P what) {
 169         cli();
 170         console_printpgm_noirq_P(what);
 171         sei();
 172 }
 173
 174 void console_printhex8(uint8_t what) {
 175         cli();
 176         console_printhex8_noirq(what);
 177         sei();
 178 }
 179
 180 void console_printdec(uint8_t what) {
 181         cli();
 182         console_printdec_noirq(what);
 183         sei();
 184 }
 185
 186 void console_init(void) {
 187         /* Set Baud Rate */
 188         UBRR0H = (uint8_t)(UBRRCALC >> 8);
 189         UBRR0L = (uint8_t)(UBRRCALC);
 190         /* Set 8 Bit mode - how braindead is it to default to 5 bit?! */
 191         UCSR0C = /* _BV(URSEL) | */ _BV(UCSZ00) | _BV(UCSZ01);
 192         /* Enable Send and Receive and IRQs */
 193         UCSR0B = _BV(TXEN0) | _BV(RXEN0) | _BV(TXCIE0) | _BV(RXCIE0);
 194         console_printpgm_noirq_P(WELCOMEMSG);
 195         console_printpgm_noirq_P(PSTR("\r\nNOTE: last reset was from"));
 196         if (mcusr_mirror & _BV(WDRF)) {
 197                 console_printpgm_noirq_P(PSTR(" WatchdogTimer"));
 198         }
 199         if (mcusr_mirror & _BV(BORF)) {
 200                 console_printpgm_noirq_P(PSTR(" Brownout"));
 201         }
 202         if (mcusr_mirror & _BV(EXTRF)) {
 203                 console_printpgm_noirq_P(PSTR(" ExternalReset"));
 204         }
 205         if (mcusr_mirror & _BV(PORF)) {
 206                 console_printpgm_noirq_P(PSTR(" PowerOn"));
 207         }
 208         console_printpgm_noirq_P(PROMPT);
 209         return;
 210 }
 211
 212 /* Handler for RXC (RX Complete) IRQ. */
 213 /* We do all query processing here. */
 214 ISR(USART_RX_vect) {
 215         uint8_t inpb;
 216
 217         inpb = UDR0;
 218         if (escstatus == 1) {
 219                 if (inpb == '[') {
 220                         escstatus = 2;
 221                 } else {
 222                         escstatus = 0;
 223                         appendchar(7); /* Bell */
 224                 }
 225                 return;
 226         }
 227         if (escstatus == 2) {
 228                 switch (inpb) {
 229                 case 'A': /* Up */
 230                         /* Try to restore the last comnmand */
 231                         for (; inputpos > 0; inputpos--) {
 232                                 appendchar(8);
 233                         }
 234                         while (inputbuf[inputpos]) {
 235                                 appendchar(inputbuf[inputpos++]);
 236                         }
 237                         break;
 238                 case 'B': /* Down */
 239                         /* New empty command line */
 240                         for (; inputpos > 0; inputpos--) {
 241                                 appendchar(8);
 242                                 appendchar(' ');
 243                                 appendchar(8);
 244                         }
 245                         break;
 246                 case 'C': /* Left */
 247                 case 'D': /* Right */
 248                 default:
 249                         appendchar(7); /* Bell */
 250                         break;
 251                 };
 252                 escstatus = 0;
 253                 return;
 254         }
 255         /* escstatus == 0, i.e. not in an escape */
 256         switch (inpb) {
 257         case 0 ... 7: /* Nonprinting characters. Ignore. */
 258         case 11 ... 12: /* Nonprinting characters. Ignore. */
 259         case 14 ... 26: /* Nonprinting characters. Ignore. */
 260         case 28 ... 31: /* Nonprinting characters. Ignore. */
 261         case 0x7f ... 0xff: /* Nonprinting characters. Ignore. */
 262                 console_printhex8_noirq(inpb);
 263                 appendchar(7); /* Bell */
 264                 break;
 265         case 9: /* tab. Should be implemented some day? */
 266                 appendchar(7); /* Bell */
 267                 break;
 268         case 27: /* Escape */
 269                 escstatus = 1;
 270                 break;
 271         case 8: /* Backspace */
 272                 if (inputpos > 0) {
 273                         inputpos--;
 274                         appendchar(inpb);
 275                         appendchar(' ');
 276                         appendchar(inpb);
 277                 }
 278                 break;
 279         case '\r': /* 13 */
 280         case '\n': /* 10 */
 281                 if (inputpos == 0) {
 282                         console_printpgm_noirq_P(PROMPT);
 283                         break;
 284                 }
 285                 inputbuf[inputpos] = 0; /* Null-terminate the string */
 286                 console_printpgm_noirq_P(CRLF);
 287                 /* now lets see what it is */
 288                 if        (strcmp_P(inputbuf, PSTR("help")) == 0) {
 289                         console_printpgm_noirq_P(PSTR("Available commands:"));
 290                         console_printpgm_noirq_P(PSTR("\r\n motd             repeat welcome message"));
 291                         console_printpgm_noirq_P(PSTR("\r\n showpins [x]     shows the avrs inputpins"));
 292                         console_printpgm_noirq_P(PSTR("\r\n status           show status / counters"));
 293                         console_printpgm_noirq_P(PSTR("\r\n [rgb] n          sets the brightness of the red / green / blue LED to n"));
 294                         console_printpgm_noirq_P(PSTR("\r\n rfstatus         show RFM12 status"));
 295                         /* console_printpgm_noirq_P(PSTR("\r\n save             saves settings to EEPROM")); */
 296                 } else if (strcmp_P(inputbuf, PSTR("motd")) == 0) {
 297                         console_printpgm_noirq_P(WELCOMEMSG);
 298                 } else if (strncmp_P(inputbuf, PSTR("showpins"), 8) == 0) {
 299                         uint8_t which = 0;
 300                         uint8_t stal = 1; uint8_t endl = 4;
 301                         if (inputpos == 10) {
 302                                 switch (inputbuf[9]) {
 303                                 case 'a':
 304                                 case 'A':
 305                                         which = 1; break;
 306                                 case 'b':
 307                                 case 'B':
 308                                         which = 2; break;
 309                                 case 'c':
 310                                 case 'C':
 311                                         which = 3; break;
 312                                 case 'd':
 313                                 case 'D':
 314                                         which = 4; break;
 315                                 };
 316                         }
 317                         if (which) {
 318                                 stal = which;
 319                                 endl = which;
 320                         }
 321                         for (which = stal; which <= endl; which++) {
 322                                 uint8_t pstatus;
 323                                 switch (which) {
 324 /*                              case 1: pstatus = PINA;
 325                                         console_printpgm_noirq_P(PSTR("PINA: 0x"));
 326                                         break;*/
 327                                 case 2: pstatus = PINB;
 328                                         console_printpgm_noirq_P(PSTR("PINB: 0x"));
 329                                         break;
 330                                 case 3: pstatus = PINC;
 331                                         console_printpgm_noirq_P(PSTR("PINC: 0x"));
 332                                         break;
 333                                 case 4: pstatus = PIND;
 334                                         console_printpgm_noirq_P(PSTR("PIND: 0x"));
 335                                         break;
 336                                 default:
 337                                         pstatus = 0;
 338                                         console_printpgm_noirq_P(PSTR("NOPIN: 0x"));
 339                                         break;
 340                                 };
 341                                 console_printhex8_noirq(pstatus);
 342                                 appendchar(' ');
 343                                 console_printbin8_noirq(pstatus);
 344                                 if (which < endl) {
 345                                         appendchar('\r'); appendchar('\n');
 346                                 }
 347                         }
 348 /*              } else if (strcmp_P(inputbuf, PSTR("save")) == 0) {
 349                         saveeepromsettings();
 350                         console_printpgm_noirq_P(PSTR("Settings written to EEPROM."));*/
 351                 } else if (strcmp_P(inputbuf, PSTR("status")) == 0) {
 352                         uint8_t v;
 353                         console_printpgm_noirq_P(PSTR("Current status:\r\n"));
 354                         console_printpgm_noirq_P(PSTR("red = "));
 355                         console_printhex8_noirq(ledpwm_re);
 356                         console_printpgm_noirq_P(PSTR(", green = "));
 357                         console_printhex8_noirq(ledpwm_gr);
 358                         console_printpgm_noirq_P(PSTR(", blue = "));
 359                         console_printhex8_noirq(ledpwm_bl);
 360                         console_printpgm_noirq_P(PSTR(", brightness = "));
 361                         console_printhex8_noirq(ledpwm_bri);
 362                         console_printpgm_noirq_P(PSTR("\r\nvalues "));
 363                         for (v = 0; v < 3; v++) {
 364                                 console_printhex8_noirq(ledpwm_val[v] >> 8);
 365                                 console_printhex8_noirq(ledpwm_val[v] & 0xff);
 366                                 console_printpgm_noirq_P(PSTR(" "));
 367                         }
 368                 } else if (strncmp_P(inputbuf, PSTR("r "), 2) == 0) {
 369                         uint8_t v;
 370                         v = strtoul(&inputbuf[2], NULL, 0);
 371                         ledpwm_re = v;
 372                         ledpwm_setled(LEDPWM_REDLED, ((uint16_t)ledpwm_re * ledpwm_bri));
 373                         console_printpgm_noirq_P(PSTR("RED value set to 0x"));
 374                         console_printhex8_noirq(v);
 375                 } else if (strncmp_P(inputbuf, PSTR("g "), 2) == 0) {
 376                         uint8_t v;
 377                         v = strtoul(&inputbuf[2], NULL, 0);
 378                         ledpwm_gr = v;
 379                         ledpwm_setled(LEDPWM_GREENLED, ((uint16_t)ledpwm_gr * ledpwm_bri));
 380                         console_printpgm_noirq_P(PSTR("GREEN value set to 0x"));
 381                         console_printhex8_noirq(v);
 382                 } else if (strncmp_P(inputbuf, PSTR("b "), 2) == 0) {
 383                         uint8_t v;
 384                         v = strtoul(&inputbuf[2], NULL, 0);
 385                         ledpwm_bl = v;
 386                         ledpwm_setled(LEDPWM_BLUELED, ((uint16_t)ledpwm_bl * ledpwm_bri));
 387                         console_printpgm_noirq_P(PSTR("BLUE value set to 0x"));
 388                         console_printhex8_noirq(v);
 389                 } else if (strncmp_P(inputbuf, PSTR("bri "), 2) == 0) {
 390                         uint8_t v;
 391                         v = strtoul(&inputbuf[4], NULL, 0);
 392                         ledpwm_bri = v;
 393                         ledpwm_set(ledpwm_re, ledpwm_gr, ledpwm_bl, ledpwm_bri);
 394                         console_printpgm_noirq_P(PSTR("brightness set to 0x"));
 395                         console_printhex8_noirq(v);
 396                 } else if (strcmp_P(inputbuf, PSTR("rfstatus")) == 0) {
 397                         uint32_t st;
 398                         st = rfm12_readstatus();
 399                         console_printpgm_noirq_P(PSTR("rfm12 status is "));
 400                         console_printhex8_noirq(st >> 24);
 401                         console_printhex8_noirq(st >> 16);
 402                         console_printhex8_noirq(st >>  8);
 403                         console_printhex8_noirq(st >>  0);
 404 #ifdef JOKECMDS
 405                 } else if (strncmp_P(inputbuf, PSTR("ls"), 2) == 0) {
 406                         console_printpgm_noirq_P(PSTR("Total 4711\r\n"));
 407                         console_printpgm_noirq_P(PSTR("----r-xr--  1 root root 42234223666 Dec 18  2004 duschcam1.avi"));
 408                 } else if (strncmp_P(inputbuf, PSTR("cat"), 3) == 0) {
 409                         if (inputpos > 4) {
 410                                 console_printtext_noirq(&inputbuf[4]);
 411                                 console_printpgm_noirq_P(PSTR(": Permission denied"));
 412                         } else {
 413                                 console_printpgm_noirq_P(PSTR("Usage: cat filename"));
 414                         }
 415 #endif /* JOKECMDS */
 416                 } else {
 417 #ifdef JOKECMDS
 418                         console_printpgm_noirq_P(PSTR("bash: "));
 419                         console_printtext_noirq(inputbuf);
 420                         console_printpgm_noirq_P(PSTR(": command not found."));
 421 #else /* JOKECMDS */
 422                         console_printpgm_noirq_P(PSTR("Unknown command: "));
 423                         console_printtext_noirq(inputbuf);
 424 #endif /* JOKECMDS */
 425                 }
 426                 /* show PROMPT and go back to start. */
 427                 console_printpgm_noirq_P(PROMPT);
 428                 inputpos = 0;
 429                 break;
 430         default:
 431                 if (inputpos < (INPUTBUFSIZE - 1)) { /* -1 for terminating \0 */
 432                         inputbuf[inputpos++] = inpb;
 433                         /* Echo the character */
 434                         appendchar(inpb);
 435                 } else {
 436                         appendchar(7); /* Bell */
 437                 }
 438         };
 439 }