MSP430F47177: SPI Driver Initialization in MSP430F47177

Hi,

is this the complete code? Do you go into a LPM mode or stay in active mode? If you maybe go to LPM3 SMCLK might be turned off. In

So the code example below should work for UCA0 and P2.4 and P2.5 and it only turns of CPU by going to LPM0. Is this maybe something you missed.

From the Init I do not see a big issue assuming UCMODE_0 = represents 0x00 to really go into 3 pin mode. Maybe you can post the register settings (debug view register) once the TX buffer was filled.

#include <msp430.h>

unsigned char MST_Data,SLV_Data;
int counter;
int main(void)
{
  volatile unsigned int i;

  WDTCTL = WDTPW+WDTHOLD;                   // Stop watchdog timer
  FLL_CTL0 |= XCAP11PF;                     // Configure load caps

  // Wait for xtal to stabilize
  do
  {
    IFG1 &= ~OFIFG;                           // Clear OSCFault flag
    for (i = 0x47FF; i > 0; i--);             // Time for flag to set
  }
  while ((IFG1 & OFIFG));                   // OSCFault flag still set?

  for(i=2100;i>0;i--);                      // Now with stable ACLK, wait for
                                            // DCO to stabilize.
  P5OUT = BIT2;                             // P5 setup for LED and slave reset
  P5DIR |= BIT1+BIT2;                            //

  P2SEL |= BIT4+BIT5;
  P3SEL |= BIT0;
  UCA0CTL0 |= UCMST+UCSYNC+UCCKPL+UCMSB;    //3-pin, 8-bit SPI master
  UCA0CTL1 |= UCSSEL_2;                     // SMCLK
  UCA0BR0 = 0x0F;                           // /2
  UCA0BR1 = 0;                              //
  UCA0MCTL = 0;                             // No modulation
  UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**
  IE2 |= UCA0RXIE;                          // Enable USCI_A0 RX interrupt

  P5OUT &= ~BIT2;                           // Now with SPI signals initialized,
  P5OUT |= BIT2;                            // reset slave

  for(i=5000;i>0;i--);                        // Wait for slave to initialize

  MST_Data = 0x001;                         // Initialize data values
  SLV_Data = 0x000;                         //

  UCA0TXBUF = MST_Data;                     // Transmit first character
 __bis_SR_register(LPM0_bits + GIE);       // CPU off, enable interrupts
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCIA0RX_ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCIAB0RX_VECTOR))) USCIA0RX_ISR (void)
#else
#error Compiler not supported!
#endif
{
  volatile unsigned int i;

  while (!(IFG2 & UCA0TXIFG));              // USART1 TX buffer ready?
  if (UCA0RXBUF==SLV_Data)                  // Test for correct character RX'd
    P5OUT |= BIT1;                          // If correct, light LED
  else
    P5OUT &= ~BIT1;                         // If incorrect, clear LED

  MST_Data++;                               // Increment data
  SLV_Data++;
  UCA0TXBUF = MST_Data;                     // Send next value

  for(i=30;i>0;i--);                        // Add time between transmissions to
}   

Hi,

today I programmed the spi_09 example on a F41777 example as shown below and I can see the data out and clock signals on the corresponding pins (put a scope shot below).

Please check if the LFO crystal is connected and the jumps over the fault flag routine of the sample code. If this does not work post a picture of the HW setup.