ez430-RF2500 Übertagungsproblem

[Martin (Gast)]

Hallo zusammen,

ich versuche meinen neu erworbenen µC (eZ430-RF2500) zum laufen zu 
bringen.
Aber schon mit den ersten Bsp-programmen zur Funkübertragung haperts.

Es soll ein I²C Bus zur Übertragung von einzelnen Bytes aufgebaut 
werden.

Aber es funktioniert nich. Beim Debuggen habe ich festegestllt, dass in 
der Zeile:

while (UCB0CTL1 & UCTXSTT);             // Start condition sent?

das Prgramm hängt.

Somit kann auch nix gesendet werden.
Aber warum? Ist das Bsp-Programm etwa falsch? liegen falsche 
einstellungen vor?
Oder woran könnte es liegen?

als dateianhang hab ich den kompletten slave-code angehangen
und hier ist der master-code:


vielen dank im vorraus!

martin



//********************************************************************** 
********
//  MSP430F22x4 Demo - USCI_B0 I2C Master RX single bytes from MSP430 
Slave
//
//  Description: This demo connects two MSP430's via the I2C bus. The 
master
//  reads from the slave. This is the master code. The data from the 
slave
//  transmitter begins at 0 and increments with each transfer. The 
received
//  data is in R5 and is checked for validity. If the received data is
//  incorrect, the CPU is trapped and the P1.0 LED will stay on. The 
USCI_B0
//  RX interrupt is used to know when new data has been received.
//  ACLK = n/a, MCLK = SMCLK = BRCLK = default DCO = ~1.2MHz
//
//                                /|\  /|\
//               MSP430F22x4      10k  10k     MSP430F22x4
//                   slave         |    |        master
//             -----------------   |    |  -----------------
//           -|XIN  P3.1/UCB0SDA|<-|---+->|P3.1/UCB0SDA  XIN|-
//            |                 |  |      |                 | 32kHz
//           -|XOUT             |  |      |             XOUT|-
//            |     P3.2/UCB0SCL|<-+----->|P3.2/UCB0SCL     |
//            |                 |         |             P1.0|--> LED
//
//  Andreas Dannenberg
//  Texas Instruments Inc.
//  October 2006
//  Built with IAR Embedded Workbench Version: 3.41A
//********************************************************************** 
********
#include "msp430x22x4.h"

unsigned char RXData;
unsigned char RXCompare;

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P1OUT &= ~0x01;                           // P1.0 = 0
  P1DIR |= 0x01;                            // P1.0 output
  P3SEL |= 0x06;                            // Assign I2C pins to 
USCI_B0
  UCB0CTL1 |= UCSWRST;                      // Enable SW reset
  UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC;     // I2C Master, synchronous 
mode
  UCB0CTL1 = UCSSEL_2 + UCSWRST;            // Use SMCLK, keep SW reset
  UCB0BR0 = 12;                             // fSCL = SMCLK/12 = ~100kHz
  UCB0BR1 = 0;
  UCB0I2CSA = 0x048;                        // Slave Address is 048h
  UCB0CTL1 &= ~UCSWRST;                     // Clear SW reset, resume 
operation
  IE2 |= UCB0RXIE;                          // Enable RX interrupt
  RXCompare = 0;                            // Used to check incoming 
data

  while (1)
  {
    while (UCB0CTL1 & UCTXSTP);             // Ensure stop condition got 
sent
    UCB0CTL1 |= UCTXSTT;                    // I2C start condition
    while (UCB0CTL1 & UCTXSTT);             // Start condition sent?
    UCB0CTL1 |= UCTXSTP;                    // I2C stop condition
    __bis_SR_register(CPUOFF + GIE);        // Enter LPM0 w/ interrupts

    if (RXData != RXCompare)                // Trap CPU if wrong
    {
      P1OUT |= 0x01;                        // P1.0 = 1
      while (1);                            // Trap CPU
    }

    RXCompare++;                            // Increment correct RX 
value
  }
}

// USCI_B0 Data ISR
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
{
  RXData = UCB0RXBUF;                       // Get RX data
  __bic_SR_register_on_exit(CPUOFF);        // Exit LPM0
}