I am so noob that only yesterday did I ever code using interrupts.
What I want to achieve is a two-whisker robot, the kind that bounces off
the wall in either direction oposite from the whisker closing a switch.
Couldn't be simpler.
Yet, I have totally been unable to find code that
1) offers more than one interrupt
2) will compile under msp430-gcc, in terminal
3) is somewhat reliable as to hardware (the debouncing thing with
capacitors does not seem to work for me)
I have mangled code to exhaustion, have been one full day and a couple
sleepless hours trying to figure this, and it's rather frustrating that
it doesn't seem anyone has had this issue before... The few code
examples are for some Windows-based tools.
At some moment I found some values that I could replicate for pin 2, 3,
4, 5, 7 (1 and 6 I had driving the LEDs to check if I was hitting
things), I was quite happy, but when testing the code again the next day
the values did not work anymore... The code got mangled, but what I
have I copy below.
To complicate :-) I want to be enable to run the whatever from the OLPC
XO laptop - that means plain msp430-gcc and mspdebug on Fedora 17
Anybody has any idea where to?
<yamarant>
Just as a BTW FYI, I wanted to keep working from my Ubuntu, and it
didn't. Trying to install msp430-gcc and mspdebug was PAINFUL. So I set
up a virtual machine with Fedora 17, and the sudo yum install went fine,
*except* for the include folder. BTW whatever I have under Ubuntu and
Fedora says that signal.h is deprecated, and all sorts of code in the
internet just won't compile - I figured out the pragma vc interrupt
thing, but it all feels downright silly, wasn't C supposed to be
somewhat /standard/?!?! And Linux standard times 8 square? (this is
payback, no doubt, the many times I made sly remarks about windowsware,
reffering to its minions as "people of non standard software"
</yamarant>
It is marvelous that this works at all, no doubt, but I shudder when it
comes to offering this to kids even noober than I...
BTW, this compiles perfect in the OLPC, msp430-gcc 3.2.3
#include <msp430x20x3.h>
#include <signal.h>
#include <stdint.h>
#define RED BIT0
#define GREEN BIT6
#define BUTTON BIT4
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P1DIR |= (RED + GREEN); // Set P1.0 to output direction
// P1.3 must stay at input
P1OUT &= ~(RED + GREEN); // set P1.0 to 0 (LED OFF)
P1IE |= BUTTON; // P1.3 interrupt enabled
P1IFG &= ~BUTTON; // P1.3 IFG cleared
//P1OUT ^= (RED + GREEN);
eint(); // enable all interrupts
for(;;)
{}
}
unsigned int i=0;
// Port 1 interrupt service routine
interrupt(PORT1_VECTOR) PORT_1(void)
{
if (P1IFG > (176)) {P1OUT ^= (RED);}; // P1.0 = toggle
// if (P1IFG == (144)) {P1OUT ^= (GREEN);}; // 144 is pin 1.4 input
if (P1IFG > (178)) {P1OUT ^= (GREEN);}; // 136 is pin 1.3 input
// if (P1IFG == (132)) {P1OUT ^= (GREEN);}; // 132 is pin 1.2 input
// if (P1IFG == (130)) {P1OUT ^= (GREEN);}; // 130 is pin 1.1 input
// if (P1IFG == (144)) {P1OUT ^= (GREEN);}; // 144 is pin 1.4 input
for (i; i<200;i++); // P1.0 = toggle
P1OUT &= ~(RED + GREEN); // set P1.0 to 0 (LED OFF)
i = 0;
P1IFG = 0; // P1.3 IFG cleared
P1IES ^= BUTTON; // toggle the interrupt edge,
// the interrupt vector will be called
// when P1.3 goes from HitoLow as well as
// LowtoHigh
}
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