MSP430G2553: CC1101 programming using msp430g2553

Hi,

Thanks for your quick response.  I have looked into these threads. I have already written the code and it is running without any errors.

Problem is when I try to get response from cc1101 i get 0 in return for example if I write

void CC1101::WriteReg(unsigned char addr, unsigned char value)

{

   delay(0.005);

   digitalWrite(chipSelectPin, LOW);

   delay(0.002);

//while (digitalRead(dataReadyPin));

   SPI.transfer(addr);

int x=   SPI.transfer(value);

   delay(0.002);

   digitalWrite(chipSelectPin, HIGH);;

Serial.println(x);

Serial.println("done.."); }// WriteReg

i just receive 0 from cc1101. whether it is single byte or burst write i always get 0 in return.
I am using energia to program it. the following code is to initiliaze SIP and write the data into cc1101, this is the spi library using by energia

void spi_initialize(void)
{
	UCB0CTL1 = UCSWRST | UCSSEL_2;      // Put USCI in reset mode, source USCI clock from SMCLK
	UCB0CTL0 = SPI_MODE_0 | UCMSB | UCSYNC | UCMST;  // Use SPI MODE 0 - CPOL=0 CPHA=0

 	/* Set pins to SPI mode. */
	pinMode_int(SCK, SPISCK_SET_MODE);
	pinMode_int(MOSI, SPIMOSI_SET_MODE);
	pinMode_int(MISO, SPIMISO_SET_MODE);

	UCB0BR0 = SPI_CLOCK_DIV() & 0xFF;   // set initial speed to 4MHz
	UCB0BR1 = (SPI_CLOCK_DIV() >> 8 ) & 0xFF;

	UCB0CTL1 &= ~UCSWRST;			    // release USCI for operation
}

uint8_t spi_send(const uint8_t _data)
{
UCB0TXBUF = _data; // setting TXBUF clears the TXIFG flag
while (UCB0STAT & UCBUSY)
; // wait for SPI TX/RX to finish

return UCB0RXBUF; // reading clears RXIFG flag
}

Thanks Tomasz,

Please update me accordingly. I just saw a youtube video on how to interface SPI device with launchpad and I can see that he has linked MOSI of SPI slave with MISO of launch pad and vice versa(please find youtube video link). I am not sure what I am doing wrong. To me following could be the possibilities:

• IC issue, SPI pins not working??
• Connections are wrong:

            At the moment I connect SCK pin of cc1101 with pin 7(P1_5) of the launch pad,csn with pin 8 (configure as output P2_0). MOSI with pin 14(P1_6) and MISO with pin 15(P1_7)

•         Energia not initializing the SPI library properly
• I use SPI.begin() to initiliaze the SPI library which calls the following code
  

  void spi_initialize(void)
  {
  	UCB0CTL1 = UCSWRST | UCSSEL_2;      // Put USCI in reset mode, source USCI clock from SMCLK
  	UCB0CTL0 = SPI_MODE_0 | UCMSB | UCSYNC | UCMST;  // Use SPI MODE 0 - CPOL=0 CPHA=0
  
   	/* Set pins to SPI mode. */
  	pinMode_int(SCK, SPISCK_SET_MODE);
  	pinMode_int(MOSI, SPIMOSI_SET_MODE);
  	pinMode_int(MISO, SPIMISO_SET_MODE);
  
  	UCB0BR0 = SPI_CLOCK_DIV() & 0xFF;   // set initial speed to 4MHz
  	UCB0BR1 = (SPI_CLOCK_DIV() >> 8 ) & 0xFF;
  
  	UCB0CTL1 &= ~UCSWRST;			    // release USCI for operation
  }

  After caling this library I set the clock rate, MSB data format, and polarity by calling the following functions

  void spi_set_divisor(const uint16_t clkdiv) //set clock rate
  {
  	UCB0CTL1 |= UCSWRST;		// go into reset state
  	UCB0BR0 = clkdiv & 0xFF;
  	UCB0BR1 = (clkdiv >> 8 ) & 0xFF;
  	UCB0CTL1 &= ~UCSWRST;		// release for operation
  }
  
  /**
   * spi_set_bitorder(LSBFIRST=0 | MSBFIRST=1)
   */
  void spi_set_bitorder(const uint8_t order)
  {
      UCB0CTL1 |= UCSWRST;        // go into reset state
      UCB0CTL0 = (UCB0CTL0 & ~UCMSB) | ((order == 1 /*MSBFIRST*/) ? UCMSB : 0); /* MSBFIRST = 1 */
      UCB0CTL1 &= ~UCSWRST;       // release for operation
  }
  
  /**
   * spi_set_datamode() - mode 0 - 3
   */
  void spi_set_datamode(const uint8_t mode) // set polarity and phase
  {
      UCB0CTL1 |= UCSWRST;        // go into reset state
      switch(mode) {
      case 0: /* SPI_MODE0 */
          UCB0CTL0 = (UCB0CTL0 & ~SPI_MODE_MASK) | SPI_MODE_0;
          break;
      case 1: /* SPI_MODE1 */
          UCB0CTL0 = (UCB0CTL0 & ~SPI_MODE_MASK) | SPI_MODE_1;
          break;
      case 2: /* SPI_MODE2 */
          UCB0CTL0 = (UCB0CTL0 & ~SPI_MODE_MASK) | SPI_MODE_2;
          break;
      case 4: /* SPI_MODE3 */
          UCB0CTL0 = (UCB0CTL0 & ~SPI_MODE_MASK) | SPI_MODE_3;
          break;
      default:
          break;
      }
      UCB0CTL1 &= ~UCSWRST;       // release for operation
  }

  I am not expert in assembly language so please advise accordingly.
  
  thank you everyone for support