Help!ez430rf2500-seh solar energy tool-can not use UART mode

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bettyxyz1028

Joined: 25 Sep 2009
Posts: 11

05 Oct 2009 10:22 Help!ez430rf2500-seh solar energy tool-can not use UART mode

I hav the ez430-rf2500-seh solar energy harvesting tool. I decided to make some modification based on the Demo code.

I wanna choose P3.5 (UART) as a receive pin.

I follow the sample codes to write a simple interrupt.

I disable the previous P3.5 function (connect to solar panel inner battery ) in the demo code.

I hav alrdy reserve a location in the msg. And the preset number can be transmitted out successfully.

I also use an echo (UCA0TXBUF=UCA0RXBUF) to test whether the ED receive the data from another board successfully.

Here comes the problem:

If i wanna the transmission btwn ED and AP, I cannt use P3SEL=0x20.

If i wanna the interrupt to happen, I hav to write in P3SEL=0x20.

I change the P3SEL=0x2F according to datasheet. But it can not work!

The cc2500 and MSP430f2274 communicate via SPI mode rite? Does that mean i can not use UART mode?

What exactly should i do to juz transfer an integer from another board to ez430-rf2500 target board????

Anybody can help me with this issue????? It looks like an easy task......

Thanks so much in advance!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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bettyxyz1028

Joined: 25 Sep 2009
Posts: 11

08 Oct 2009 3:21 Re: Help!ez430rf2500-seh solar energy tool-can not use UART

Here is my code:

linkTo()
{
...

P3SEL = 0x3f; // If i put this one here, transmission will fail
BCSCTL1 = CALBC1_1MHZ; // Set DCO = 1MHz
DCOCTL = CALDCO_1MHZ;
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 0x68; // 1MHz 9600
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRF_0 + UCBRS_1 ; // Modulation UCBRSx = 1
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
__enable_interrupt();

...
}

#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
aNumber = UCA0RXBUF; // TX -> RXed character
IE2&=~UCA0RXIE;
}

Added after 53 seconds:

Another way:

BCSCTL1 = CALBC1_1MHZ; // Set DCO = 1MHz
DCOCTL = CALDCO_1MHZ;
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 0x68; // 1MHz 9600
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRF_0 + UCBRS_1 ; // Modulation UCBRSx = 1
UCA0CTL1 |= UCSWRST; //set the USCWRST
P3SEL |= 0x3f;//configure ports
UCA0CTL1 &= ~UCSWRST;//clear uscwrst
if(IFG2 & UCA0RXIFG)
{
aNumber = UCA0RXBUF;
}
else
{
aNumber=11;
}

Both can not work... Anyone can help??? tks