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 #define RESET 0x80      // not a real app -- causes firmware to reset
  16 #define DEBUGAPP 0xFF
  17
  18 //! General init function, calls platform-specific one.
  19 void init(){
  20 #ifdef MSP430
  21   #define INITCHIP msp430_init();
  22 #endif
  23
  24 #ifdef ARDUINO
  25   #define INITCHIP arduino_init();
  26 #endif
  27
  28 #ifdef INITCHIP
  29 INITCHIP
  30 #else
  31 #warning "No init() routine for this platform!"
  32 #endif
  33
  34 #ifdef INITPLATFORM
  35   INITPLATFORM
  36 #endif
  37 }
  38
  39
  40
  41 //! Handle a command.
  42 void handle(uint8_t const app,
  43                         uint8_t const verb,
  44                         uint32_t const len)
  45 {
  46         int i;
  47
  48         //debugstr("GoodFET");
  49         PLEDOUT&=~PLEDPIN;
  50
  51         // find the app and call the handle fn
  52         for(i = 0; i < num_apps; i++)
  53         {
  54                 if(apps[i]->app == app)
  55                 {
  56                         // call the app's handle fn
  57                         (*(apps[i]->handle))(app, verb, len);
  58
  59                         // exit early
  60                         return;
  61                 }
  62         }
  63
  64         // if we get here, then the desired app is not copiled in
  65         // this firmware
  66         debugstr("App missing.");
  67         debughex(app);
  68         txdata(app, NOK, 0);
  69 }
  70
  71
  72 //! Main loop.
  73 int main(void)
  74 {
  75         volatile unsigned int i;
  76         unsigned char app, verb;
  77         unsigned long len;
  78         // MSP reboot count for reset input & reboot function located at 0xFFFE
  79         volatile unsigned int reset_count = 0;
  80         void (*reboot_function)(void) = (void *) 0xFFFE;
  81
  82         init();
  83
  84         txstring(MONITOR,OK,"http://goodfet.sf.net/");
  85
  86         //Command loop.  There's no end!
  87         while(1)
  88         {
  89                 //Magic 3
  90                 app = serial_rx();
  91
  92                 // If the app is the reset byte (0x80) increment and loop
  93                 if (app == RESET)
  94                 {
  95                         reset_count++;
  96
  97                         if (reset_count > 4)
  98                         {
  99                                 // We could trigger the WDT with either:
 100                                 // WDTCTL = 0;
 101                                 // or
 102                                 // WDTCTL = WDTPW + WDTCNTCL + WDTSSEL + 0x00;
 103                                 // but instead we'll jump to our reboot function pointer
 104                                 (*reboot_function)();
 105                         }
 106
 107                         continue;
 108                 }
 109                 else
 110                 {
 111                         reset_count = 0;
 112                 }
 113
 114                 verb = serial_rx();
 115                 //len=serial_rx();
 116                 len = rxword();
 117
 118                 //Read data, looking for buffer overflow.y
 119                 if(len <= CMDDATALEN)
 120                 {
 121                         for(i = 0; i < len; i++)
 122                         {
 123                                 cmddata[i] = serial_rx();
 124                         }
 125
 126                         handle(app,verb,len);
 127                 }
 128                 else
 129                 {
 130                         //Listen to the blaberring.
 131                         for(i = 0; i < len; i++)
 132                                 serial_rx();
 133
 134                         //Reply with an error.
 135                         debugstr("Buffer length exceeded.");
 136                         txdata(MONITOR,NOK,0);
 137                 }
 138         }
 139 }
 140