MSP430

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Revision as of 14:02, 18 October 2012 by imported>Cubz
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MSP430G2 Launchpad

Some links

Tutorials

SPI Interface (USCI)

Code Examples

Datasheets

TI Guides

Projects

Code Examples

Timer and Button Interrupts

Blinking LED swaps on Button click. Implemented using interrupts

<syntaxhighlight lang="c">

  1. include <msp430g2553.h>

__attribute__((interrupt(TIMER0_A0_VECTOR))) void CCR0_ISR(void) {

   P1OUT ^= BIT6 | BIT0;

}

__attribute__((interrupt(PORT1_VECTOR))) void BtnClick(void) {

   if( P1IFG & BIT3 ) {
       P1IFG &= ~BIT3;
       P1DIR ^= BIT6|BIT0;
   }

}

main() {

   WDTCTL = WDTPW + WDTHOLD;
   TACCR0 = 62500 - 1;
   TACCTL0 = CCIE;
   TACTL = TASSEL_2 + ID_3 + MC_1 + TACLR;
   P1REN = BIT3;
   P1DIR = BIT6;
   P1OUT = BIT6|BIT3;
   P1IES |= BIT3;
   P1IFG &= ~BIT3;
   P1IE |= BIT3;
   __enable_interrupt();
   for(;;);

} </syntaxhighlight>

Compiling and flashing

You need to have a recent version of mspgcc. Debian testing has it in the repository, Fedora should have it soon, installation from source is not that painful.

$ msp430-gcc -Os -Wall -g -mmcu=msp430g2553 -o image.elf source1.c source2.c
$ mspdebug rf2500 "prog image.elf"

Simple Makefile

<syntaxhighlight lang="make"> TARGET=clk MCU=msp430g2553

CC=msp430-gcc CFLAGS=-Os -Wall -Wno-main -g -mmcu=$(MCU)

all: $(TARGET).elf

%.elf: %.c

   $(CC) $(CFLAGS) -o $@ $<

flash: $(TARGET).elf

   mspdebug rf2500 "prog $(TARGET).elf"

clean:

   rm -fr *.o *.elf

</syntaxhighlight>

Debugging

The remarkable mspdebug contains basic (yet still very useful) debugger, however if you want to have a full source-level debugger, you can use (mspgcc-supplied version of) gdb via mspdebug's gdb stub.

$ mspdebug rf2500 gdb &
$ msp430-gdb image.elf
(gdb) target remote :2000