CCS/cc430f5137: I want example code about dac6311 using.

Please forward this topic.

And, I confused DAC6311 using by SPI. So, I want change topic.

Could you provide example code for dac6311 usage by SPI?

In this case, Which forum I select?

I can select below in your system.

pls advice.

I think you should use this one:
e2e.ti.com/.../73
BR
Siri

I have sent an email to someone from the DAC group, I hope he will response soon.

Regards,
/TA

Hi,

I have some issue SPI communication to DAC6311.

I try to execute below code. but MCU doesn't work "P1.4/ PM_UCB0CLK".

Please advice about below code.

////////////////////////////////////////////////////////////////
// spi function
////////////////////////////////////////////////////////////////
#define SPI_PORT_SEL P1SEL
#define SPI_PORT_OUT P1OUT
#define SPI_PORT_REN P1REN
#define SPI_PORT_DIR P1DIR

#define DIN_PIN BIT3 // UCB0SIMO pin
#define SCL_PIN BIT4 // UCB0CLK pin
#define SYNC_PIN BIT2 // CS pin

int PtrTransmit;
unsigned char SPIBufferArray[66];
unsigned char I2CBuffer;

void SPIInit()
{
SPI_PORT_OUT = SYNC_PIN; // SYNC High
SPI_PORT_DIR |= SYNC_PIN + SCL_PIN; // Set as Outputs
SPI_PORT_SEL |= DIN_PIN + SCL_PIN; // Assign SPI pins to USCI_B0

// Recommended initialisation steps of I2C module as shown in User Guide:
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 |= UCCKPH + UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI master
UCB0CTL1 |= UCSSEL__SMCLK;
UCB0BR0 |= 0x02; // /2
UCB0BR1 = 0; //
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation

}

void SPIWriteInit()
{
UCB0CTL1 |= UCTR; // UCTR=1 => Transmit Mode (R/W bit = 0)
UCB0IFG &= ~UCTXIFG;
UCB0IE |= UCTXIE; // enable Transmit ready interrupt

__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts
}

void SPI_Write(int DataVlaue)
{
int SPIData = 0;

if(DataVlaue > 1023 || DataVlaue < 0)
{
return;
}

SPIData = (DataVlaue << 4) & 0x03FF; // 10 bit mask (max = 1023)

SPI_PORT_OUT &= (~SYNC_PIN);

while(UCB0STAT & UCBUSY); // Waits for completion for shift register and buffer to be empty

SPIBufferArray[1] = (DataVlaue & 0xFF00) >> 8; // 1 Byte register address
SPIBufferArray[0] = DataVlaue & 0x00FF;
PtrTransmit = 1; // set I2CBufferArray Pointer

SPIWriteInit();

while(UCB0STAT & UCBUSY); // Waits for completion for shift register and buffer to be empty

SPI_PORT_OUT |= (SYNC_PIN);

}
//-------------------------------------------------------------------------------
// The USCI_B0 data ISR is used to move received data from the I2C slave
// to the MSP430 memory. It is structured such that it can be used to receive
//-------------------------------------------------------------------------------
#pragma vector = USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void)
{
if(UCB0IFG & UCTXIFG)
{
UCB0TXBUF = SPIBufferArray[PtrTransmit];// Load TX buffer
PtrTransmit--; // Decrement TX byte counter
if(PtrTransmit < 0)
{
while(!(UCB0IFG & UCTXIFG));
UCB0IE &= ~UCTXIE; // disable interrupts.
UCB0IFG &= ~UCTXIFG; // Clear USCI_B0 TX int flag
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0
}
}
else if(UCB0IFG & UCRXIFG)
{
I2CBuffer = UCB0RXBUF; // store received data in buffer
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0
}
}

and, I have more question.

For DAC6311, I want make clock 50Mhz.

I tried to find example codes, they don't work.

could you provide example code for 50Mhz clock of SPI?

Hello,

Configuring the SCLK of the SPI interface is a function of your MCU platform / available clocks. I would suggest that you post your inquiry concerning clock configurations to the appropriate forum for the controller you're using. Based on the thread history that's the CC430F5137 and the folks supporting those products may still be "listening" to this thread. Otherwise I can make the post for you if you'd like.

From the DACs perspective 50MHz is an acceptable SCLK assuming AVDD of 3.6V up to 5.5V. For lower supply voltages the maximum SCLK frequency is 20MHz.

Concerning debugging the code which you posted - can you provide oscilloscope captures of the SCLK, SYNC, and DIN signals for the DAC6311 so we can see what is happening on the bus? Any further details that help describe the problem would be helpful...