[SOLVED] SPI Interfacing TRF7960 with MSP430GF2274 (using ez430-RF2500 kit)

[Sedat-G]

Hi Everyone,



I am trying to integrate TRF7960 to ez430RF2500. I know CC2500 on the board is using USCI_B0(SPI). So, by driving STE pin to high, I disabled C2500 from SPI communication. I assigned Port2.0 as SS pin to select TRF7960 for SPI communication. So far there is no problem, when I try to sent consecutive commands to TRF, my software gets stuck. Can someone show me where my mistake is?



Part of my code that is related to the SPI comm:





DCOCTL=CALDCO_12MHZ;

BCSCTL1=CALBC1_12MHZ; //Clock is set for 3MHZ operation.

BCSCTL2=DIVM_2 + DIVS_2;





UCB0CTL0 = UCMSB + UCMST + UCMODE_2 + UCSYNC; //Most Significant Bit, Master Mode and 4-PIN SPI (STE active low) is set.

UCB0CTL1 = UCSSEL_2 + UCSWRST; //SMCLK is set.

CSHI; //Turn OFF CC2500 to SPI. --> POUT &= ~0x01

UCB0CTL1 &= ~UCSWRST; //Initialize SPI Communication.

SlaveSelectLOW; //Turn ON TRF7960 to SPI. --->P2OUT &= ~0x01



//RESET...

while(!(IFG2&UCB0TXIFG)); //TXBUF ready??

UCB0TXBUF = RESET;

DELAY();

IFG2 &= ~UCB0TXIFG;



//Reading IRQ status...

while(!(IFG2&UCB0TXIFG)); //TXBUF Ready?? <----THIS is WHERE IT STOPS.

UCB0TXBUF = READ_IRQ;

DELAY();



UCB0CTL0 &= ~UCCKPH; //Switch Clock Polarity.



UCB0TXBUF = 0x00; //Dummy write to start Receive

while(!(IFG2&UCB0RXIFG));

DELAY();



WRT2MEM(UCB0RXBUF); //Write to Info MEM.