Adding support for the Arduino Mega (ATmega1280) to the core and bootloader.

3 files changed, 356 insertions, 42 deletions

diff --git a/bootloaders/atmega/ATmegaBOOT_168.c b/bootloaders/atmega/ATmegaBOOT_168.c
index 9413f86..8ea1509 100755
--- a/bootloaders/atmega/ATmegaBOOT_168.c
+++ b/bootloaders/atmega/ATmegaBOOT_168.c
@@ -6,6 +6,12 @@
 /*                                                        */

 /* ATmegaBOOT.c                                           */

 /*                                                        */

+/*                                                        */

+/* 20090308: integrated Mega changes into main bootloader */

+/*           source by D. Mellis                          */

+/* 20080930: hacked for Arduino Mega (with the 1280       */

+/*           processor, backwards compatible)             */

+/*           by D. Cuartielles                            */

 /* 20070626: hacked for Arduino Diecimila (which auto-    */

 /*           resets when a USB connection is made to it)  */

 /*           by D. Mellis                                 */

@@ -101,6 +107,7 @@
 

 /* Adjust to suit whatever pin your hardware uses to enter the bootloader */

 /* ATmega128 has two UARTS so two pins are used to enter bootloader and select UART */

+/* ATmega1280 has four UARTS, but for Arduino Mega, we will only use RXD0 to get code */

 /* BL0... means UART0, BL1... means UART1 */

 #ifdef __AVR_ATmega128__

 #define BL_DDR  DDRF

@@ -108,6 +115,8 @@
 #define BL_PIN  PINF

 #define BL0     PINF7

 #define BL1     PINF6

+#elif defined __AVR_ATmega1280__ 

+/* we just don't do anything for the MEGA and enter bootloader on reset anyway*/

 #else

 /* other ATmegas have only one UART, so only one pin is defined to enter bootloader */

 #define BL_DDR  DDRD

@@ -119,26 +128,25 @@
 

 /* onboard LED is used to indicate, that the bootloader was entered (3x flashing) */

 /* if monitor functions are included, LED goes on after monitor was entered */

-#ifdef __AVR_ATmega128__

-/* Onboard LED is connected to pin PB7 (e.g. Crumb128, PROBOmega128, Savvy128) */

+#if defined __AVR_ATmega128__ || defined __AVR_ATmega1280__

+/* Onboard LED is connected to pin PB7 (e.g. Crumb128, PROBOmega128, Savvy128, Arduino Mega) */

 #define LED_DDR  DDRB

 #define LED_PORT PORTB

 #define LED_PIN  PINB

 #define LED      PINB7

 #else

-/* Onboard LED is connected to pin PB2 (e.g. Crumb8, Crumb168) */

+/* Onboard LED is connected to pin PB5 in Arduino NG, Diecimila, and Duomilanuove */ 

+/* other boards like e.g. Crumb8, Crumb168 are using PB2 */

 #define LED_DDR  DDRB

 #define LED_PORT PORTB

 #define LED_PIN  PINB

-/* 20060803: hacked by DojoCorp, LED pin is B5 in Arduino */

-/* #define LED      PINB2 */

 #define LED      PINB5

 #endif

 

 

 /* monitor functions will only be compiled when using ATmega128, due to bootblock size constraints */

-#ifdef __AVR_ATmega128__

-#define MONITOR

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

+#define MONITOR 1

 #endif

 

 

@@ -146,7 +154,17 @@
 /* manufacturer byte is always the same */

 #define SIG1	0x1E	// Yep, Atmel is the only manufacturer of AVR micros.  Single source :(

 

-#if defined __AVR_ATmega128__

+#if defined __AVR_ATmega1280__

+#define SIG2	0x97

+#define SIG3	0x03

+#define PAGE_SIZE	0x80U	//128 words

+

+#elif defined __AVR_ATmega1281__

+#define SIG2	0x97

+#define SIG3	0x04

+#define PAGE_SIZE	0x80U	//128 words

+

+#elif defined __AVR_ATmega128__

 #define SIG2	0x97

 #define SIG3	0x02

 #define PAGE_SIZE	0x80U	//128 words

@@ -282,6 +300,7 @@ int main(void)
 #else

 	/* We run the bootloader regardless of the state of this pin.  Thus, don't

 	put it in a different state than the other pins.  --DAM, 070709

+	This also applies to Arduino Mega -- DC, 080930

 	BL_DDR &= ~_BV(BL);

 	BL_PORT |= _BV(BL);

 	*/

@@ -298,24 +317,30 @@ int main(void)
 	}

 #endif

 

+#if defined __AVR_ATmega1280__

+	/* the mega1280 chip has four serial ports ... we could eventually use any of them, or not? */

+	/* however, we don't wanna confuse people, to avoid making a mess, we will stick to RXD0, TXD0 */

+	bootuart = 1;

+#endif

+

 	/* check if flash is programmed already, if not start bootloader anyway */

 	if(pgm_read_byte_near(0x0000) != 0xFF) {

 

 #ifdef __AVR_ATmega128__

-		/* no UART was selected, start application */

-		if(!bootuart) {

-			app_start();

-		}

+	/* no UART was selected, start application */

+	if(!bootuart) {

+		app_start();

+	}

 #else

-		/* check if bootloader pin is set low */

-		/* we don't start this part neither for the m8, nor m168 */

-		//if(bit_is_set(BL_PIN, BL)) {

-		//	app_start();

-		//}

+	/* check if bootloader pin is set low */

+	/* we don't start this part neither for the m8, nor m168 */

+	//if(bit_is_set(BL_PIN, BL)) {

+	//      app_start();

+	//    }

 #endif

 	}

 

-#ifdef __AVR_ATmega128__

+#ifdef __AVR_ATmega128__    

 	/* no bootuart was selected, default to uart 0 */

 	if(!bootuart) {

 		bootuart = 1;

@@ -324,7 +349,7 @@ int main(void)
 

 

 	/* initialize UART(s) depending on CPU defined */

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 	if(bootuart == 1) {

 		UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);

 		UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;

@@ -370,12 +395,22 @@ int main(void)
 	UCSRB = _BV(TXEN)|_BV(RXEN);

 #endif

 

+#if defined __AVR_ATmega1280__

+	/* Enable internal pull-up resistor on pin D0 (RX), in order

+	to supress line noise that prevents the bootloader from

+	timing out (DAM: 20070509) */

+	/* feature added to the Arduino Mega --DC: 080930 */

+	DDRE &= ~_BV(PINE0);

+	PORTE |= _BV(PINE0);

+#endif

+

+

 	/* set LED pin as output */

 	LED_DDR |= _BV(LED);

 

 

 	/* flash onboard LED to signal entering of bootloader */

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 	// 4x for UART0, 5x for UART1

 	flash_led(NUM_LED_FLASHES + bootuart);

 #else

@@ -383,10 +418,9 @@ int main(void)
 #endif

 

 	/* 20050803: by DojoCorp, this is one of the parts provoking the

-	system to stop listening, cancelled from the original */

+		 system to stop listening, cancelled from the original */

 	//putch('\0');

 

-

 	/* forever loop */

 	for (;;) {

 

@@ -531,15 +565,18 @@ int main(void)
 			else {					        //Write to FLASH one page at a time

 				if (address.byte[1]>127) address_high = 0x01;	//Only possible with m128, m256 will need 3rd address byte. FIXME

 				else address_high = 0x00;

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__)

 				RAMPZ = address_high;

 #endif

 				address.word = address.word << 1;	        //address * 2 -> byte location

 				/* if ((length.byte[0] & 0x01) == 0x01) length.word++;	//Even up an odd number of bytes */

 				if ((length.byte[0] & 0x01)) length.word++;	//Even up an odd number of bytes

 				cli();					//Disable interrupts, just to be sure

-				// HACKME: EEPE used to be EEWE

+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__)

 				while(bit_is_set(EECR,EEPE));			//Wait for previous EEPROM writes to complete

+#else

+				while(bit_is_set(EECR,EEWE));			//Wait for previous EEPROM writes to complete

+#endif

 				asm volatile(

 					 "clr	r17		\n\t"	//page_word_count

 					 "lds	r30,address	\n\t"	//Address of FLASH location (in bytes)

@@ -634,7 +671,7 @@ int main(void)
 					 "rjmp	write_page	\n\t"

 					 "block_done:		\n\t"

 					 "clr	__zero_reg__	\n\t"	//restore zero register

-#if defined(__AVR_ATmega168__)  || defined(__AVR_ATmega328P__)

+#if defined __AVR_ATmega168__  || __AVR_ATmega328P__ || __AVR_ATmega128__ || __AVR_ATmega1280__ || __AVR_ATmega1281__ 

 					 : "=m" (SPMCSR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"

 #else

 					 : "=m" (SPMCR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"

@@ -656,7 +693,7 @@ int main(void)
 	else if(ch=='t') {

 		length.byte[1] = getch();

 		length.byte[0] = getch();

-#if defined __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 		if (address.word>0x7FFF) flags.rampz = 1;		// No go with m256, FIXME

 		else flags.rampz = 0;

 #endif

@@ -680,7 +717,7 @@ int main(void)
 				else {

 

 					if (!flags.rampz) putch(pgm_read_byte_near(address.word));

-#if defined __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 					else putch(pgm_read_byte_far(address.word + 0x10000));

 					// Hmmmm, yuck  FIXME when m256 arrvies

 #endif

@@ -702,7 +739,7 @@ int main(void)
 			putch(0x10);

 		} else {

 			if (++error_count == MAX_ERROR_COUNT)

-			app_start();

+				app_start();

 		}

 	}

 

@@ -713,7 +750,7 @@ int main(void)
 	}

 

 

-#ifdef MONITOR

+#if defined MONITOR 

 

 	/* here come the extended monitor commands by Erik Lins */

 

@@ -723,18 +760,20 @@ int main(void)
 		if(ch=='!') {

 		ch = getch();

 		if(ch=='!') {

-

-#ifdef __AVR_ATmega128__

+			PGM_P welcome = "";

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 			uint16_t extaddr;

 #endif

 			uint8_t addrl, addrh;

 

 #ifdef CRUMB128

-			PGM_P welcome = {"ATmegaBOOT / Crumb128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};

+			welcome = "ATmegaBOOT / Crumb128 - (C) J.P.Kyle, E.Lins - 050815\n\r";

 #elif defined PROBOMEGA128

-			PGM_P welcome = {"ATmegaBOOT / PROBOmega128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};

+			welcome = "ATmegaBOOT / PROBOmega128 - (C) J.P.Kyle, E.Lins - 050815\n\r";

 #elif defined SAVVY128

-			PGM_P welcome = {"ATmegaBOOT / Savvy128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};

+			welcome = "ATmegaBOOT / Savvy128 - (C) J.P.Kyle, E.Lins - 050815\n\r";

+#elif defined __AVR_ATmega1280__ 

+			welcome = "ATmegaBOOT / Arduino Mega - (C) Arduino LLC - 090930\n\r";

 #endif

 

 			/* turn on LED */

@@ -793,7 +832,7 @@ int main(void)
 						putch(getch());

 					}

 				}

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 				/* external bus loop  */

 				else if(ch == 'b') {

 					putch('b');

@@ -872,7 +911,7 @@ void puthex(char ch) {
 

 void putch(char ch)

 {

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 	if(bootuart == 1) {

 		while (!(UCSR0A & _BV(UDRE0)));

 		UDR0 = ch;

@@ -894,13 +933,28 @@ void putch(char ch)
 

 char getch(void)

 {

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

+	uint32_t count = 0;

 	if(bootuart == 1) {

-		while(!(UCSR0A & _BV(RXC0)));

-		return UDR0;

-	}

+		while(!(UCSR0A & _BV(RXC0))) {

+			/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/               

+			/* HACKME:: here is a good place to count times*/

+			count++;

+			if (count > MAX_TIME_COUNT)

+				app_start();

+			}

+

+			return UDR0;

+		}

 	else if(bootuart == 2) {

-		while(!(UCSR1A & _BV(RXC1)));

+		while(!(UCSR1A & _BV(RXC1))) {

+			/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/               

+			/* HACKME:: here is a good place to count times*/

+			count++;

+			if (count > MAX_TIME_COUNT)

+				app_start();

+		}

+

 		return UDR1;

 	}

 	return 0;

@@ -932,7 +986,7 @@ char getch(void)
 void getNch(uint8_t count)

 {

 	while(count--) {

-#ifdef __AVR_ATmega128__

+#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega1280__)

 		if(bootuart == 1) {

 			while(!(UCSR0A & _BV(RXC0)));

 			UDR0;

diff --git a/bootloaders/atmega/ATmegaBOOT_168_atmega1280.hex b/bootloaders/atmega/ATmegaBOOT_168_atmega1280.hex
new file mode 100644
index 0000000..f16e877
--- /dev/null
+++ b/bootloaders/atmega/ATmegaBOOT_168_atmega1280.hex
@@ -0,0 +1,245 @@
+:020000021000EC

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diff --git a/bootloaders/atmega/Makefile b/bootloaders/atmega/Makefile
index 861cedd..6c6c215 100755
--- a/bootloaders/atmega/Makefile
+++ b/bootloaders/atmega/Makefile
@@ -166,6 +166,21 @@ atmega328_isp: LFUSE = FF
 atmega328_isp: EFUSE = 05
 atmega328_isp: isp
 
+mega: TARGET = atmega1280
+mega: MCU_TARGET = atmega1280
+mega: CFLAGS += '-DMAX_TIME_COUNT=F_CPU>>4' '-DNUM_LED_FLASHES=0' -DBAUD_RATE=57600
+mega: AVR_FREQ = 16000000L 
+mega: LDSECTION  = --section-start=.text=0x1F000
+mega: $(PROGRAM)_atmega1280.hex
+
+mega_isp: mega
+mega_isp: TARGET = atmega1280
+mega_isp: MCU_TARGET = atmega1280
+mega_isp: HFUSE = DA
+mega_isp: LFUSE = FF
+mega_isp: EFUSE = F5
+mega_isp: isp
+
 isp: $(TARGET)
 	$(ISPFUSES)
 	$(ISPFLASH)