X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fgoodfet.c;h=c7563e6f3fb4aecea0a6fc929b1c56a75cfcdec9;hp=00dd921ad7e21cca776f35312f9542f54c75d3d0;hb=88da22de367f4d959d31f1b5363e2a8e22109451;hpb=0fb25630e9970a4e6d18e190c484f654490565b0

diff --git a/firmware/goodfet.c b/firmware/goodfet.c
index 00dd921..c7563e6 100644
--- a/firmware/goodfet.c
+++ b/firmware/goodfet.c
@@ -1,86 +1,189 @@
-//GOODFET Main File
-//Includes several applications.
-
-#include "platform.h"
-#include "command.h"
-#include "apps.h"
-
-
-
-//LED on P1.0
-//IO on P5
-
-//! Initialize registers and all that jazz.
-void init(){
-  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
-  
-  //LED out and on.
-  PLEDDIR |= PLEDPIN;
-  PLEDOUT |= PLEDPIN;
-  
-  //Setup clocks, unique to each '430.
-  msp430_init_dco();
-  msp430_init_uart();
-  
-  //Enable Interrupts.
-  //eint();
-}
-
-//! Handle a command.
-void handle(unsigned char app,
-	    unsigned char verb,
-	    unsigned char len){
-  switch(app){
-  case MONITOR:
-    monitorhandle(app,verb,len);
-    break;
-  case SPI:
-    spihandle(app,verb,len);
-    break;
-  case I2CAPP:
-    i2chandle(app,verb,len);
-    break;
-  case CHIPCON:
-    cchandle(app,verb,len);
-    break;
-  case JTAG:
-    jtaghandle(app,verb,len);
-    break;
-  case JTAG430: //Also JTAG430X, JTAG430X2
-    jtag430x2handle(app,verb,len);
-    break;
-  default:
-    #ifdef HANDLEOTHER
-    HANDLEOTHER(app,verb,len);
-    #else
-    txdata(app,NOK,0);
-    #endif
-    break;
-  }
-}
-
-//! Main loop.
-int main(void)
-{
-  volatile unsigned int i;
-  unsigned char app, verb, len;
-  
-  init();
-  
-  txstring(MONITOR,OK,"http://goodfet.sf.net/");
-  
-  //Command loop.  There's no end!
-  while(1){
-    //Magic 3
-    app=serial_rx();
-    verb=serial_rx();
-    len=serial_rx();
-    
-    //Read data, if any
-    for(i=0;i<len;i++){
-      cmddata[i]=serial_rx();
-    }
-    handle(app,verb,len);
-  }
-}
-
+/*! \file goodfet.c
+  \author Travis Goodspeed
+  \brief Main module.
+  
+  This is the main module of the GoodFET, which calls the initialization
+  routines and delegates commands to the various applications.
+*/
+
+
+#include "platform.h"
+#include "command.h"
+#include "apps.h"
+#include "glitch.h"
+
+#define RESET 0x80      // not a real app -- causes firmware to reset
+#define DEBUGAPP 0xFF
+
+//! Initialize registers and all that jazz.
+void init()
+{
+#ifdef DAC12IR
+	int i;
+#endif
+
+	WDTCTL = WDTPW + WDTHOLD;					// Stop watchdog timer
+
+	//LED out and on.
+	PLEDDIR |= PLEDPIN;
+	PLEDOUT &= ~PLEDPIN;
+
+
+	/* P5.0 out and low; this is chosen for the PIC app (in which P5.0
+	 is !MCLR) to ensure that an attached PIC chip, if present, is
+	 immediately driven to reset state. A brief explanation of why this
+	 is important follows.
+
+	At least dsPIC33F and PIC24H --and very likely other 16-bit PIC
+	families-- draw a large amount of current when running, especially
+	when using a fast clock: from 60 mA up to approx. 90 mA.  If the
+	PIC target begins to run before the client can request a new ICSP
+	session, which requires much less current (e.g., less than 2 mA),
+	then the MSP430 chip on the GoodFET will fail to start and the FTDI
+	may have trouble communicating with the client.	The latter likely
+	relates to the FTDI on-chip 3V3 regulator being specified up to
+	only 50 mA. */
+
+
+	//P5REN &= ~BIT0; //DO NOT UNCOMMENT.  Breaks GF1x support.
+
+	//This will have to be cut soon.	Use pulling resistors instead.
+	/*
+	P5DIR |= BIT0;
+	P5OUT &= ~BIT0;
+	*/
+
+	//Setup clocks, unique to each '430.
+	msp430_init_dco();
+	msp430_init_uart();
+
+	//DAC should be at full voltage if it exists.
+#ifdef DAC12IR
+	//glitchvoltages(0xfff,0xfff);
+	ADC12CTL0 = REF2_5V + REFON;					// Internal 2.5V ref on
+	for(i=0;i!=0xFFFF;i++) asm("nop");
+	DAC12_0CTL = DAC12IR + DAC12AMP_5 + DAC12ENC; // Int ref gain 1
+	DAC12_0DAT = 0xFFF; //Max voltage 0xfff
+	DAC12_1CTL = DAC12IR + DAC12AMP_5 + DAC12ENC; // Int ref gain 1
+	DAC12_1DAT = 0x000; //Min voltage 0x000
+#endif
+
+	/** FIXME
+	  
+	  This part is really ugly.  GSEL (P5.7) must be high to select
+	  normal voltage, but a lot of applications light to swing it low
+	  to be a nuissance.  To get around this, we assume that anyone
+	  with a glitching FET will also have a DAC, then we set that DAC
+	  to a high voltage.
+	  
+	  At some point, each target must be sanitized to show that it
+	  doesn't clear P5OUT or P5DIR.
+	*/
+	P5DIR|=BIT7; P5OUT=BIT7; //Normal Supply
+	//P5DIR&=~BIT7; //Glitch Supply
+
+	//Enable Interrupts.
+	//eint();
+}
+
+
+//! Handle a command.
+void handle(uint8_t const app,
+			uint8_t const verb,
+			uint32_t const len)
+{
+	int i;
+
+	//debugstr("GoodFET");
+	PLEDOUT&=~PLEDPIN;
+
+	// find the app and call the handle fn
+	for(i = 0; i < num_apps; i++)
+	{
+		if(apps[i]->app == app)
+		{
+			// call the app's handle fn
+			(*(apps[i]->handle))(app, verb, len);
+
+			// exit early
+			return;
+		}
+	}
+
+	// if we get here, then the desired app is not copiled in 
+	// this firmware
+	debugstr("App missing.");
+	debughex(app);
+	txdata(app, NOK, 0);
+}
+
+
+//! Main loop.
+int main(void)
+{
+	volatile unsigned int i;
+	unsigned char app, verb;
+	unsigned long len;
+	// MSP reboot count for reset input & reboot function located at 0xFFFE
+	volatile unsigned int reset_count = 0;
+	void (*reboot_function)(void) = (void *) 0xFFFE;
+
+	init();
+  
+	txstring(MONITOR,OK,"http://goodfet.sf.net/");
+  
+	//Command loop.  There's no end!
+	while(1)
+	{
+		//Magic 3
+		app = serial_rx();
+
+		// If the app is the reset byte (0x80) increment and loop
+		if (app == RESET)
+		{
+			reset_count++;
+
+			if (reset_count > 4) 
+			{
+				// We could trigger the WDT with either:
+				// WDTCTL = 0;
+				// or
+				// WDTCTL = WDTPW + WDTCNTCL + WDTSSEL + 0x00;
+				// but instead we'll jump to our reboot function pointer
+				(*reboot_function)();
+			}
+
+			continue;
+		} 
+		else 
+		{
+			reset_count = 0;
+		}
+
+		verb = serial_rx();
+		//len=serial_rx();
+		len = rxword();
+
+		//Read data, looking for buffer overflow.y
+		if(len <= CMDDATALEN)
+		{
+			for(i = 0; i < len; i++)
+			{
+				cmddata[i] = serial_rx();
+			}
+
+			handle(app,verb,len);
+		}
+		else
+		{
+			//Listen to the blaberring.
+			for(i = 0; i < len; i++)
+				serial_rx();
+
+			//Reply with an error.
+			debugstr("Buffer length exceeded.");
+			txdata(MONITOR,NOK,0);
+		}
+	}
+}
+