msp430: p2.6 and p2.7 messing up wireless

KCheung

Other Parts Discussed in Thread: CC2500, SIMPLICITI

So I have a weird problem. My wireless transmitter works fine, but when I set p2.6 and p2.7 to be outputs, suddenly, the ED can't detect the AP anymore.

When I have the following Code:

P2DIR = 0x30; // P2.0, 2.1, 2.2, and 2.3 need to be inputs

Everything works fine but when I switch it to:

P2DIR = 0xF0; // P2.0, 2.1, 2.2, and 2.3 need to be inputs

The program will get stuck in this loop for some reason:

while (SMPL_NO_JOIN == SMPL_Init((uint8_t (*)(linkID_t))0))
{
    BSP_TOGGLE_LED1();
    BSP_TOGGLE_LED2();;
    __bis_SR_register(LPM3_bits + GIE);     // LPM3 with interrupts enabled
}

Any ideas why this is happening?

over 17 years ago

0 old_cow_yellow over 17 years ago

Guru 58965 points

Why did you change the direction of P2.7 and P2.6. Are those pins connected to something?

0 KCheung over 17 years ago in reply to old_cow_yellow

Intellectual 455 points

Yeah, I believe they connect to pin 14 and 13 respectively on hte rf2500 board. I plan to use those ports ot power other things in a circuit.

0 old_cow_yellow over 17 years ago in reply to KCheung

Guru 58965 points

I once absent-mindedly turned on a switch. I heard a very laude noise from the sink and found a chewed up fork in the garbage disposal. [:O]

0 KCheung over 17 years ago in reply to old_cow_yellow

Intellectual 455 points

Are you saying that if I mess with these variables, I might destroy my silverware?

0 old_cow_yellow over 17 years ago in reply to KCheung

Guru 58965 points

I frightened myself and damaged my possessions because I was careless. I do not blame anything being weird.

0 KCheung over 17 years ago in reply to old_cow_yellow

Intellectual 455 points

Ahh gotcha. Well, do you have any idea what I might have damaged? I changed the pins back to what they were and the wireless works again...

0 Brandon08 over 17 years ago in reply to KCheung

TI__Mastermind 24530 points

KCheung,

P2.6 & P2.7 on the F2274 are crystal pins by default, so the P2SEL bits are set on reset to revert to crystal functionality. Now on the EZ430 kit these pins are connected to the CC2500 (see page 8 of the User's Guide) so the simpliciti demos configure those pins as gpios as needed for that particular CC2500 application.

I hope this helps.

0 Randy Carpenter over 15 years ago in reply to Brandon08

Prodigy 230 points

K, I've noticed that the default chip settings have P2.6, P2.7 set to XIN and XOUT for my msp4302452.

I've tried to set them to general purpose I/O pins this way... but no luck so far.... anyone know what im doing wrong?

my code is:

P2SEL &= 0x00;

// configure XIN, XOUT as P2.6, P2.7 General I/O **********THIS ISNT WORKING*************

// P2DIR &= ~0x80;

// P2DIR &= ~0x40;

P2DIR &= 0x3F;

// for (;;)

// {

if(( 0x80 & ~P2IN))

// Check if motor control is disabled

{

// P2DIR &= ~0x40;

if (( 0x40 & ~P2IN))

// Check if motor control is enabled

{

P1DIR |= 0x10;

// P1DIR |= 0x20;

P1OUT |= 0x10;

// P1.4 = Motor Run Down...Enable Port 1, bit 4

P1OUT &= ~0x20;

// P1.5 = Motor Run Up...Disable Port 1, bit 5

}

// else

// {

// P1OUT&= ~0x10;

// P1OUT&= ~0x20;

// }

}

else

{

P1OUT&= ~0x10;

P1OUT&= ~0x20;

}

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msp430: p2.6 and p2.7 messing up wireless