X-Git-Url: http://git.kpe.io/?p=avr_bc100.git;a=blobdiff_plain;f=BaseTinyFirmware%2FGCC%2Fstatefunc.c;fp=BaseTinyFirmware%2FGCC%2Fstatefunc.c;h=9fc0ae5ae08669aecee4f6b6dfa13b1d2c4117c3;hp=ef1464dcab714766f0addf4d6fb0261e04cec53b;hb=89173ec9cd6f33843bf27c45be0f2f9be3f5f0ce;hpb=7997f136b12114035265bd082c854bff95fd73dc

diff --git a/BaseTinyFirmware/GCC/statefunc.c b/BaseTinyFirmware/GCC/statefunc.c
index ef1464d..9fc0ae5 100644
--- a/BaseTinyFirmware/GCC/statefunc.c
+++ b/BaseTinyFirmware/GCC/statefunc.c
@@ -16,14 +16,14 @@
  *      AVR463: Charging NiMH Batteries with BC100
  *
  * \par Documentation
- *      For comprehensive code documentation, supported compilers, compiler 
+ *      For comprehensive code documentation, supported compilers, compiler
  *      settings and supported devices see readme.html
  *
  * \author
  *      Atmel Corporation: http://www.atmel.com \n
  *      Support email: avr@atmel.com
  *
- * 
+ *
  * $Name$
  * $Revision: 2299 $
  * $RCSfile$
@@ -65,6 +65,9 @@ unsigned char ErrorFlags;  //!< \brief Holds error flags.
 //! \note See menu.h for definitions of states.
 unsigned char ErrorState;
 
+//! \brief Set to 1 by the watchdog-timeout-ISR
+//! \note added by Martin Thomas
+volatile unsigned char WatchdogFlag;
 
 //******************************************************************************
 // Functions
@@ -93,17 +96,20 @@ unsigned char Initialize(unsigned char inp)
 
 	// Disable interrupts while setting prescaler.
 	cli();
-	
+
 	CLKPR = (1<<CLKPCE);          // Enable CLKPS bit modification.
 	CLKPR = 0;                    // Set prescaler 1 => 8 MHz clock frequency.
-	
+
 	// Init 1-Wire(R) interface.
 	OWI_Init(OWIBUS);
-	
+
 	// Clear on-chip EEPROM.
-	for (page = 0; page < 4; page++)	{
+	for (page = 0; page < 4; page++) {
 		for (i = 0; i < 32; i++) {
-			eeprom_write_byte(&BattEEPROM[page][i], 0);
+			// mthomas: avoid unneeded writes
+			if ( eeprom_read_byte( &BattEEPROM[page][i] ) != 0 ) {
+				eeprom_write_byte( &BattEEPROM[page][i], 0 );
+			}
 		}
 	}
 
@@ -124,10 +130,10 @@ unsigned char Initialize(unsigned char inp)
 	}
 
 	DisableBatteries();
-	
+
 	BattActive = 0;               // We have to start somewhere..
 	ErrorFlags = 0;
-	
+
 	// Init complete! Go to ST_BATCON next.
 	return(ST_BATCON);
 }
@@ -153,16 +159,16 @@ unsigned char Initialize(unsigned char inp)
 unsigned char BatteryControl(unsigned char inp)
 {
 	unsigned char i;
-	
+
 	// Make sure ADC inputs are configured properly! (Will disables batteries.)
 	if (!JumperCheck()) {
 		return(ST_ERROR);           // Error. Exit before damage is done!
 	}
-	
+
 	// If neither battery is valid, flag error and go to error state
 	if (!(eeprom_read_byte(&BattControl[0]) & BIT_BATTERY_ENABLED) && (!eeprom_read_byte(&BattControl[1]) & BIT_BATTERY_ENABLED)) {
 		SetErrorFlag(ERR_NO_BATTERIES_ENABLED);
-		
+
 		return(ST_ERROR);
 	}
 
@@ -229,43 +235,72 @@ unsigned char Sleep(unsigned char inp)
 				return(ST_BATCON);
 			}
 		}
-		
+
 		DisableBatteries();  // Disable both batteries before Doze()!
 	} while (TRUE);
 }
 
+/*! \brief Watchdog interrupt-service-routine
+ *
+ * Called on watchdog timeout, added by Martin Thomas
+ */
+ISR(WDT_vect)
+{
+	WatchdogFlag = 1;
+}
+
 
 /*! \brief Doze off for approx. 8 seconds (Vcc = 5 V)
  *
  * Waits for ADC-cycles to complete, disables the ADC, then sleeps for
  * approx. 8 seconds (Vcc = 5 V) using the watchdog timer.
  * On wakeup, ADC is re-enabled.
+ * Modification by Martin Thomas:
+ *  Do not enter standby mode if PB6 is low (MASTER_INT on BC100)
+ *  so SPI communication with the master-controller is still possible
+ *  during "doze".
  */
 void Doze(void)
 {
+	uint8_t sreg_saved;
 	// Wait for this ADC cycle to complete, then halt after the next one.
 	ADC_Wait();
 	ADCS.Halt = TRUE;
 	ADCS.Flag = FALSE;
-	
+
 	do {
 	} while (ADCS.Flag == FALSE);
-	
+
 	WDTCR = (1<<WDP3)|(1<<WDP0);            // 8.0 seconds at 5 volts VCC.
 	WDTCR |= (1<<WDIF)|(1<<WDIE)|(1<<WDE);  // Clear flag and enable watchdog.
-	MCUCR |= (1<<SE) | (1<<SM1)|(1<<SM0);   // Sleep enable, mode = standby.
-	sleep_cpu();                            // Go to sleep, wake up by WDT.
-	
-	wdt_reset();                            // Clear watchdog reset flag.
-	MCUSR &= ~(1<<WDRF);          
+
+	DDRB  &= ~(1<<PB6);   // MASTER_INT as input
+	PORTB |= (1<<PB6);    // enabled internal pullup
+	WatchdogFlag = 0;
+	if ( PINB & (1<<PB6) ) {
+		MCUCR |= (1<<SE) | (1<<SM1) | (1<<SM0); // Sleep enable, mode = standby.
+		sleep_cpu();                            // Go to sleep, wake up by WDT.
+	}
+	else {
+		do {
+		} while ( !(WatchdogFlag) );
+	}
+
+	wdt_reset();           // Clear watchdog reset flag.
+	PORTB &= ~(1<<PB6);    // disabled internal pullup
+	MCUSR &= ~(1<<WDRF);
+
+	sreg_saved = SREG;
+	cli();
 	WDTCR |= (1<<WDCE)|(1<<WDE);            // Watchdog change enable.
 	WDTCR = 0;                              // Turn off watchdog.
-	
+	SREG = sreg_saved;
+
 	ADCS.Halt = FALSE;                      // Enable consecutive runs of ADC.
 	ADCSRA |= (1<<ADEN)|(1<<ADSC);          // Enable ADC & start conversion.
-	
+
 	// Wait for this cycle to complete.
-	ADC_Wait();                             
+	ADC_Wait();
 }
 
 
@@ -294,10 +329,10 @@ void Doze(void)
 unsigned char Error(unsigned char inp)
 	{
 	unsigned char i;
-	
+
 	PWM_Stop();           // Stop charging.
 	DisableBatteries();   // Disable all loads.
-	
+
 	do {
 		Doze();           // Take a nap.
 
@@ -306,7 +341,7 @@ unsigned char Error(unsigned char inp)
 		for (i = 0x01; i!=0; i<<=1) {
 			if(i & ErrorFlags) {
 				switch (i) {
-				
+
 				case  ERR_JUMPER_MISMATCH:
 					// Clear flag & recheck.
 					ErrorFlags &= ~i;
@@ -341,7 +376,7 @@ unsigned char Error(unsigned char inp)
 					ErrorFlags &= ~i;
 				break;
 
-					
+
 				default:
 				break;
 				}
@@ -386,12 +421,12 @@ unsigned char JumperCheck(void)
 	signed int adcs_IBAT_tmp;
 
 	 DisableBatteries();       // Disconnect, or loads may be destroyed!
-	 
+
 	 PWM_Start();              // Start PWM (controls the buck charger).
-	
+
 	 // Use general timer: shouldn't take longer than (6 x 255) / 2500 ~= 0.62s.
 	 Time_Set(TIMER_GEN,0,1,0);
-	
+
 	do {
 		// If the PWM output voltage saturates the ADC, stop PWM output and
 		// report a failure.
@@ -412,7 +447,7 @@ unsigned char JumperCheck(void)
 		// typical value are below our set maximum, everything is OK.
 		if (abs((signed int)(adcs_VIN_tmp - VIN_VBAT_DIFF_TYP - adcs_VBAT_tmp)) <
 		                     VIN_VBAT_DIFF_MAX ) {
-				 
+
 			PWM_Stop();
 			return(TRUE);
 		}
@@ -429,11 +464,11 @@ unsigned char JumperCheck(void)
 			PWM_Stop();
 			return(FALSE);
 		}
-		
+
 		// Wait for ADC conversions to complete
 		ADC_Wait();
 	} while (Time_Left(TIMER_GEN));
-	
+
 
 	// If we end up here, the measurements took too long.
 	PWM_Stop();