MSP430: Difference between revisions

Latest revision as of 14:02, 18 October 2012

MSP430G2 Launchpad

Some links

Tutorials

SPI Interface (USCI)

http://fortytwoandnow.blogspot.ch/2012/07/msp430g2-usci-spi-interface-1.html

Code Examples

Datasheets

TI Guides

Projects

RTC clock

Code Examples

Timer and Button Interrupts

Blinking LED swaps on Button click. Implemented using interrupts

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

@@ Line 1: / Line 1: @@
+[[Category:Articles ]]
 == MSP430G2 Launchpad ==
 === Some links ===
@@ Line 4: / Line 6: @@
 * http://mspsci.blogspot.cz/2010/07/tutorial-01-getting-started.html
 * [http://justinstech.org/2010/07/msp430-launchpad-dev-kit-how-too/ How to solder the 32KHz Crystal on to the launchpad]
+* http://dbindner.freeshell.org/msp430/index.html
+* http://www.43oh.com/category/tutorials-2/
 ==== SPI Interface (USCI) ====
 * http://fortytwoandnow.blogspot.ch/2012/07/msp430g2-usci-spi-interface-1.html
 ==== Code Examples ====
-* http://svn.noccy.com/mspdev/reference/MSP430ware/examples/devices/2xx/MSP430G2xx3%20Code%20Examples/C/
+* [http://svn.noccy.com/mspdev/reference/MSP430ware/examples/devices/2xx/MSP430G2xx3%20Code%20Examples/C/ MSP430G2xx3]
+* [http://svn.noccy.com/mspdev/reference/MSP430ware/examples/devices/2xx/MSP430G2xx2%20Code%20Examples/C/ MSP430G2xx2]
+==== Datasheets ====
+* [http://www.ti.com/lit/ds/symlink/msp430g2553.pdf MSP430G2553]
+* [http://www.ti.com/lit/gpn/msp430g2452 MSP430G2452]
+==== TI Guides ====
+* [http://www.ti.com/lit/ug/slau144i/slau144i.pdf MSP430x2xx Family User's Guide]
+* [http://www.ti.com/lit/an/slaa330/slaa330.pdf Software I2C Slave Using the MSP430]
+* [http://www.ti.com/lit/ug/slau318b/slau318b.pdf LaunchPad Experimenter Board User's Guide]
+==== Projects ====
+* [http://www.simpleavr.com/msp430-projects/rtc-clock RTC clock]
 === Code Examples ===
@@ Line 15: / Line 33: @@
 Implemented using interrupts
-<pre>#include <msp430g2553.h>
+<syntaxhighlight lang="c">
+#include <msp430g2553.h>
 __attribute__((interrupt(TIMER0_A0_VECTOR)))
@@ Line 49: / Line 68: @@
      for(;;);
 }
+</syntaxhighlight>
+=== Compiling and flashing ===
+You need to have a recent version of [http://mspgcc.sourceforge.net/ mspgcc]. Debian testing has it in the repository, Fedora should have it soon, [http://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=Install:fromsource installation from source] is not that painful.
+<pre>
+$ msp430-gcc -Os -Wall -g -mmcu=msp430g2553 -o image.elf source1.c source2.c
+$ mspdebug rf2500 "prog image.elf"
+</pre>
+==== 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 $(TARGET).elf"
+clean:
+    rm -fr *.o *.elf
+</syntaxhighlight>
+=== Debugging ===
+The remarkable [http://mspdebug.sourceforge.net/ mspdebug] contains basic (yet still very useful) debugger, however if you want to have a full source-level debugger, you can use (mspgcc-supplied version of) gdb via mspdebug's gdb stub.
+<pre>
+$ mspdebug rf2500 gdb &
+$ msp430-gdb image.elf
+(gdb) target remote :2000
 </pre>