git.rot13.org Git - goodfet/blob - firmware/goodfet.c

   1 /*! \file goodfet.c
   2   \author Travis Goodspeed
   3   \brief Main module.
   4
   5   This is the main module of the GoodFET, which calls the initialization
   6   routines and delegates commands to the various applications.
   7 */
   8
   9
  10 #include "platform.h"
  11 #include "command.h"
  12 #include "apps.h"
  13 #include "glitch.h"
  14
  15 #if (platform == tilaunchpad)
  16 #include <setjmp.h>
  17 jmp_buf warmstart;
  18 void coldstart();
  19 #include "msp430_serial.h"
  20 #endif
  21
  22 #define RESET 0x80      // not a real app -- causes firmware to reset
  23 #define DEBUGAPP 0xFF
  24
  25 //! General init function, calls platform-specific one.
  26 void init(){
  27 #ifdef MSP430
  28   #define INITCHIP msp430_init();
  29 #endif
  30
  31 #ifdef ARDUINO
  32   #define INITCHIP arduino_init();
  33 #endif
  34
  35 #if (platform == donbfet)
  36 # define INITCHIP donbfet_init();
  37 #endif
  38
  39 #ifdef INITCHIP
  40 INITCHIP
  41 #else
  42 #warning "No init() routine for this platform!"
  43 #endif
  44
  45 #ifdef INITPLATFORM
  46   INITPLATFORM
  47 #endif
  48 }
  49
  50
  51
  52 //! Handle a command.
  53 void handle(uint8_t const app,
  54             uint8_t const verb,
  55             uint32_t const len){
  56   int i;
  57
  58   //debugstr("GoodFET");
  59   //led_off();
  60
  61   // find the app and call the handle fn
  62   for(i = 0; i < num_apps; i++){
  63     if(apps[i]->app == app){
  64       // call the app's handle fn
  65       (*(apps[i]->handle))(app, verb, len);
  66
  67       // exit early
  68       return;
  69     }
  70   }
  71
  72   // if we get here, then the desired app is not compiled into
  73   // this firmware
  74   debugstr("App missing.");
  75   debughex(app);
  76   txdata(app, NOK, 0);
  77 }
  78
  79
  80 //! Main loop.
  81 int main(void)
  82 {
  83         volatile unsigned int i;
  84         unsigned char app, verb;
  85         unsigned long len;
  86         // MSP reboot count for reset input & reboot function located at 0xFFFE
  87         volatile unsigned int reset_count = 0;
  88 #if (platform == tilaunchpad)
  89         int ret=0;
  90
  91         //ret = setjmp(warmstart);// needs to be here since context from init() would be gone
  92  warmstart:
  93         if (ret == 0) {
  94                 coldstart();    // basic hardware setup, clock to TUSB3410, and enable
  95         } else if (ret == 2) {
  96                 dputs("\nalmost BSL only one RTS change\n");
  97         } else if (ret > 2) {   // reset released after more than two tst transisitions
  98                 // We could write a BSL, a nice exercise for a Sunday afternoon.
  99                 dputs("\nBSL\n");
 100                 //call_BSL();   // once you are done uncomment ;-)
 101         } else {                // we come here after DTR high (release reset)
 102                 dputs("\nWarmstart\n");
 103         }
 104 #elif (platform == donbfet)
 105         extern void donbfet_reboot(void);
 106         void (*reboot_function)(void) = donbfet_reboot;
 107 #else
 108         void (*reboot_function)(void) = (void *) 0xFFFE;
 109 #endif
 110         init();
 111
 112         txstring(MONITOR,OK,"http://goodfet.sf.net/");
 113         //txstring(0xab,0xcd,"http://goodfet.sf.net/");
 114
 115
 116         //Command loop.  There's no end!
 117         while(1)
 118         {
 119                 //Magic 3
 120                 app = serial_rx();
 121
 122                 // If the app is the reset byte (0x80) increment and loop
 123                 if (app == RESET)
 124                 {
 125                         reset_count++;
 126
 127                         if (reset_count > 4)
 128                         {
 129                                 // We could trigger the WDT with either:
 130                                 // WDTCTL = 0;
 131                                 // or
 132                                 // WDTCTL = WDTPW + WDTCNTCL + WDTSSEL + 0x00;
 133                                 // but instead we'll jump to our reboot function pointer
 134 #ifdef MSP430
 135 # if (platform == tilaunchpad)
 136                                 // do we really need this, we do not want to reset the TUSB3410
 137                                 dputs("reset_count>4\n");
 138
 139                                 //longjmp(warmstart,111);
 140                                 goto warmstart;
 141
 142 # else
 143                                 (*reboot_function)();
 144 # endif
 145 #else /* !MSP430 */
 146 # if (platform == donbfet)
 147                                 (*reboot_function)();
 148 # else
 149                                 debugstr("Rebooting not supported on this platform.");
 150 # endif
 151 #endif
 152                         }
 153
 154                         continue;
 155                 }
 156                 else
 157                 {
 158                         reset_count = 0;
 159                 }
 160
 161                 verb = serial_rx();
 162                 len = rxword();
 163
 164                 //Read data, looking for buffer overflow.
 165                 if(len <= CMDDATALEN)
 166                 {
 167                         for(i = 0; i < len; i++)
 168                         {
 169                                 cmddata[i] = serial_rx();
 170                         }
 171
 172                         handle(app,verb,len);
 173                 }
 174                 else
 175                 {
 176                         //Listen to the blaberring.
 177                         for(i = 0; i < len; i++)
 178                                 serial_rx();
 179
 180                         //Reply with an error.
 181                         debugstr("Buffer length exceeded.");
 182                         txdata(MONITOR,NOK,0);
 183                 }
 184         }
 185 }
 186