Noobie needs example code :) (mspgcc/Linux)

[turd 31]

Hello,

Where could I find example code that works with mspgcc?

I've been using the PICAXE chips for years now and I use FreeBASIC quit a bit but thats all just BASIC. I've played around with the Arduino a bit but thats the only C experience I have.

Is there maybe some documentation or even some tutorials out there?

Thank you

[chibiace 46]

take a look at:

 

http://hackaday.com/2010/08/11/how-to-launchpad-programming-with-linux/

 

http://processors.wiki.ti.com/index.php/MSP430_LaunchPad_(MSP-EXP430G2)#Download_all_MSP430G2xx_code_examples

 

 

get a make file and your program usually main.c, edit up your code.

1. make

2. sudo mspdebug rf2500 'prog main.elf'

 

here is a little something i made for use as a template:

main.c

#include "signal.h"
#include "io.h"

void delay(register unsigned int t)
{register unsigned int i; for (i = 0; i < t*100; i++){}}

void main(){
 WDTCTL = WDTPW + WDTHOLD;     // Turn off watchdog timer.
 P1DIR |= BIT0+BIT6;           // Set P1.0 & P1.6 as output.
 int a=0;
 while (a==0){                 // Loop
       P1OUT |= BIT0+BIT6;     // Turn P1.0 & P1.6 on.
       delay(100);
       P1OUT &= ~BIT0+BIT6;    // Turn P1.0 & P1.6 off.
       delay(100);
}}

 

and Makefile

CC=msp430-gcc
CFLAGS=-Os -Wall -g -mmcu=msp430x2012

OBJS=main.o


all: $(OBJS)
$(CC) $(CFLAGS) -o main.elf $(OBJS)

%.o: %.c
       $(CC) $(CFLAGS) -c $<

clean:
     	rm -fr main.elf $(OBJS)

[rockets4kids 204]

Most of TI's sample code code for CCS/IAR will compile under mspgcc by changing only the interrupt syntax.

 

mspgcc provides an abstraction for interrupt handling in isr_compat.h but this hasn't worked for me.

 

Instead, I just use the following code block:

 

#if defined (__GNUC__)  // mspgcc
#include 
#define ISR(a, void __attribute__((interrupt (a))) b (void)
#else // CCS/IAR
#include 
#define __PRAGMA__(x) _Pragma(#x)
#define ISR(a, \
__PRAGMA__(vector=a) \
__interrupt void b(void)
#endif

 

You define an ISR like this:

 

ISR (PORT1_VECTOR, port1_isr)
{
   // isr here
}

 

The following Makefile may also be of interest:

 

PROG            = hk8
CC              = msp430-gcc
CXX             = msp430-g++
OBJDUMP         = msp430-objdump
SIZE            = msp430-size
MSPDEBUG        = mspdebug
CFLAGS          = -O0 -Wall -g -mmcu=msp430g2211
FET             = rf2500
GDB             = msp430-gdb
GDBTUI          = $(GDB)tui

OBJS=$(PROG).o

all: $(PROG).elf  $(PROG).lst
       $(SIZE) $(PROG).elf

.PHONY: all

$(PROG).elf: $(OBJS)
       $(CC) $(CFLAGS) -o $(PROG).elf $(OBJS)

%.o: %.c
       $(CC) $(CFLAGS) -c $<

%.lst: %.elf
       $(OBJDUMP) -DS $< >$@

clean:
       rm -fr *.o *.elf *.lst *~ \#*

install: $(PROG).elf
       $(MSPDEBUG) $(FET) "prog $(PROG).elf"

mspdebug: $(PROG).elf
       $(MSPDEBUG) $(FET)

debug: $(PROG).elf
       $(MSPDEBUG) $(FET) gdb

gdb: $(PROG).elf
       $(GDB) $(PROG).elf

tui: $(PROG).elf
       $(GDBTUI) $(PROG).elf

ddd: $(PROG).elf
       ddd --debugger $(GDB) $(PROG).elf

[turd 31]

Thanks guys!

 

I've followed the Hack a Day example and I've been able to run their example code

 

Ya, I always get errors to do with interrupts so your posts will be a big help!

 

I found a pdf tutorial on the forum called "Beginning Microcontrollers with the MSP430 Tutorial" and it's pretty good.

 

This is going to save me a bit of time :

sudo mspdebug rf2500 'prog main.elf'

 

Thanks again for the code, template and make files!

[gordon 229]

2. sudo mspdebug rf2500 'prog main.elf'

http://mspdebug.sourceforge.net/faq.html#usb_noroot

[turd 31]

Thanks for the link gordon!

 

I'm having some trouble getting this example from "Beginning Microcontrollers with the MSP430 Tutorial" to work:

http://www.glitovsky.com/Tutorialv0_3.pdf

page 43. (slightly modified)

#include 
#include 
#include 

void configureClocks();
volatile unsigned int i;	// volatile to prevent optimization

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
configureClocks();


// Configure LED on P1.0
P1DIR = BIT0;				// P1.0 output
P1OUT &= ~BIT0;				// P1.0 output LOW, LED Off

// Configure Switch on P1.2 //
P1REN |= BIT3;				//Enable Pullup/Pulldown
P1OUT = BIT3;				//pullup
P1IE |= BIT3;				//interrupt enabled
P1IES |= BIT3;				//Hi/lo falling edge
P1IFG &= ~BIT3;				//IFG cleared just in case

_EINT();
while(1)
{
	// Execute some other code
}
}

void configureClocks()
{
// Set system DCO to 8MHz
BCSCTL1 = CALBC1_8MHZ;
DCOCTL = CALDCO_8MHZ;

// Set LFXT1 to the VLO @ 12kHz
BCSCTL3 |= LFXT1S_2;
}

// Port 1 interrupt service routine
IRS(PORT1_VECTOR, port1_isr)
{
P1OUT ^= BIT0;				// Toggle LED at P1.0
P1IFG &= ~BIT3;				// P1.2 IFG cleared
}

msp430-gcc -Os -Wall -g -mmcu=msp430x2012 -c expl.c

expl.c:8: warning: return type of

[bluehash 1,581]

IRS(PORT1_VECTOR, port1_isr)

 

You have a typo... IRS

[turd 31]

I changed it but I'm still getting errors:

 

#include 
#include 
#include 

void configureClocks();
volatile unsigned int i;	// volatile to prevent optimization

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
configureClocks();


// Configure LED on P1.0
P1DIR = BIT0;				// P1.0 output
P1OUT &= ~BIT0;				// P1.0 output LOW, LED Off

// Configure Switch on P1.2 //
P1REN |= BIT3;				//Enable Pullup/Pulldown
P1OUT = BIT3;				//pullup
P1IE |= BIT3;				//interrupt enabled
P1IES |= BIT3;				//Hi/lo falling edge
P1IFG &= ~BIT3;				//IFG cleared just in case

_EINT();
while(1)
{
	// Execute some other code
}
}

void configureClocks()
{
// Set system DCO to 8MHz
BCSCTL1 = CALBC1_8MHZ;
DCOCTL = CALDCO_8MHZ;

// Set LFXT1 to the VLO @ 12kHz
BCSCTL3 |= LFXT1S_2;
}

// Port 1 interrupt service routine
IRS(PORT1_VECTOR, port1_irs)
{
P1OUT ^= BIT0;				// Toggle LED at P1.0
P1IFG &= ~BIT3;				// P1.2 IFG cleared
}

msp430-gcc -Os -Wall -g -mmcu=msp430x2012 -c expl.c

expl.c:9: warning: return type of

[turd 31]

I got it

 

#include 
#include 
#include 

void configureClocks();
volatile unsigned int i;	// volatile to prevent optimization

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
configureClocks();


// Configure LED on P1.0
P1DIR = BIT0;				// P1.0 output
P1OUT &= ~BIT0;				// P1.0 output LOW, LED Off

// Configure Switch on P1.2 //
P1REN |= BIT3;				//Enable Pullup/Pulldown
P1OUT = BIT3;				//pullup
P1IE |= BIT3;				//interrupt enabled
P1IES |= BIT3;				//Hi/lo falling edge
P1IFG &= ~BIT3;				//IFG cleared just in case

_EINT();
while(1)
{
	// Execute some other code
}
}

void configureClocks()
{
// Set system DCO to 8MHz
BCSCTL1 = CALBC1_8MHZ;
DCOCTL = CALDCO_8MHZ;

// Set LFXT1 to the VLO @ 12kHz
BCSCTL3 |= LFXT1S_2;
}

// Port 1 interrupt service routine
interrupt(PORT1_VECTOR) port1_irs (void)
{
P1OUT ^= BIT0;				// Toggle LED at P1.0
P1IFG &= ~BIT3;				// P1.2 IFG cleared
}

[bluehash 1,581]

Apparently I was in the wrong... but kuddos! you solved it.

[turd 31]

Thanks bluehash

Here's an unrelated question; with the Launch Pad, could you fry P1.3 if it was set as an out put and it was high and you ground it out by pressing the button attached to it?