CCS/MSP430G2553: MSP430 with SPI connection

Hello Yash,

There are examples for the SPI master and slave in the Resource Explorer MSPWARE for MSP430G2553

Click the link above to view the examples.

Hello,

Below code of SPI connection (GPIO expander) is what's problem? and also below code UART jumper requier or not ? do not have any LED blink.

Code:

#include "msp430g2553.h"

#define CS BIT5 //Set P1.3 as Chip Select

void ConfigureSPI (void); //Set up SPI communication

int main (void)
{

WDTCTL = WDTPW + WDTHOLD; //Stop watchdog timer
DCOCTL = 0; //Select lovest DCOx and MODx settings
BCSCTL1 = CALBC1_1MHZ; //Set range
DCOCTL = CALDCO_1MHZ; //Set DCO step + modulation

// *** Set up GPIO *** //
P1OUT = 0x33; //Turn pins LOW except P1.5(_CS) & P1.0
P1DIR = 0xFD; //Set Port 1 as OUTPUTS exc. P1.1

ConfigureSPI(); //Configure MSP for SPI
while (1)
{
//Set A port to OUTPUTS
P1OUT &= ~CS; //Set _CS LOW
UCA0TXBUF = 0x40; //Send Control Byte DOUGHT HERE

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready?
UCA0TXBUF = 0x00; //Access to IODIRA here i am send data on IODIR in place of IODIRA

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready?
UCA0TXBUF = 0x00; //Set to OUTPUTS

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready? (IFG2 & UCA0RXIFG) in place of (UCBUSY & UCA0STAT) write this
P1OUT |= CS; //Set _CS HIGH
__delay_cycles(10000); //Simple delay

//Send data to GPIOA address

P1OUT &= ~CS; //Set _CS LOW
UCA0TXBUF = 0x40; //Send Control Byte

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready?
UCA0TXBUF = 0x09; //Access to GPIOA

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready?
UCA0TXBUF = 0xFE; //Turn ON OUTPUTS

while (!(UCBUSY & UCA0STAT)); //USCI_A0 TX buffer ready?
P1OUT |= CS; //Set _CS HIGH
__delay_cycles(10000); //Simple delay
}
}
//Sub-programm for SPI setup
void ConfigureSPI(void)
{
P1SEL |= BIT1 + BIT2 + BIT4; //Set up pins
P1SEL2 |= BIT1 + BIT2 + BIT4; //Set up pins
UCA0CTL1 = UCSWRST;
UCA0CTL0 |= UCMSB + UCMST + UCSYNC; //MSB first, Master mode, Synchronous mode (3-wire)
UCA0CTL1 |= UCSSEL1; //SMCLK
UCA0CTL1 &= ~UCSWRST; //Release USCI for operation
}

Hello Yash,

I'm not sure I understand what the problem is with the SPI.
Can you describe what is not working?

Hello,

I am using MSP430 2553 with the connection of GPIO expander with SPI connection. In the GPIO expander port, I have to connect LED but they have not started so above code work fine in this condition or any mistake on that code? and also In this communication require a UART jumper or not?