CCS/MSP430F5529: MSP430F5529 SPI COMMUNICATION

Hello Vikash,

Check the ACS71020 datasheet.  It appears you will read the data from the slave on the MISO pin.  I suspect you need 32 clocks to read the 32bit data result.

Respected sir,

when we send 32 bit data on MISO, , It takes 32 clock to send it right. But after sending when we check the data on SIMO it appear only 8 bit data on SIMO Pins, that is 0xFF. What does it means?

beacause acs71020 IC gives the output of 32 bits.

so my questions is that when i recieve the data bit wise bit through interputs.

i am writting a code on msp430f5529, i request you kindly see my send function and recieve function, and tell me where i am wrong?

void send( int data,int i)
{
int l;
__disable_interrupt();
l=data;
l=l>>8;
while(i){
while(!( UCB1IFG & UCTXIFG));
UCB1TXBUF = l;
l=data;
i--;
}
while(UCB1STAT & UCBUSY);
// __enable_interrupt();
__bis_SR_register(GIE);

}

#pragma vector=USCI_B1_VECTOR
__interrupt void USCI_B1_ISR(void)
{
switch(__even_in_range(UCB1IV,4))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
for(i=0;i<32;i++)
{
if(i==32){
Flag=1;
UCB1IFG &=~ UCRXIFG;
break;
}
while (!(UCB1IFG & UCRXIFG));
*value = UCB1RXBUF;
value++;
}
__bis_SR_register(GIE);
break;

case 4:break; // Vector 4 - TXIFG
default: break;
}
}

Here my data is :

/*Custmer access code (0x4F70656E) WITH ADDRESS 0x2F*/
P3OUT&=~BIT7;
send(0x2F,1);
send(0x4F70,2);
send(0x656E,2);
P3OUT|=BIT7;

while(1)
{
__delay_cycles(1234);
P3OUT&=~BIT7;
send(0x20,1);
__delay_cycles(4321);
P3OUT|=BIT7;

}

here i am using 4 -pin SPI

void init_UCB1(void)
{
P4SEL|=BIT1+BIT2+BIT3;
UCB1CTL1 |= UCSWRST;
UCB1CTL0 = UCCKPH + UCMSB + UCMST + UCMODE_1 + UCSYNC; //UCB0CTL0 |= UCMST+UCSYNC+UCCKPL+UCMSB;
UCB1CTL1 = UCSSEL_2;
//UCB0BR0 = 255;
UCB1CTL1 &=~UCSWRST;
}

Please check my code, where i am wrong, because i am not recieving the data 32 bit on simo pins.

waiting for your Positive response

Vikash Chandra Raman

Comcon Industries

New -Delhi

Part Number: MSP430F5529

Tool/software: Code Composer Studio

Dear sir,

This is Vikash chandra Raman from Comcon-Industries. I am doing a project related to measure the current as well as voltages. For measuring the current and voltages i am using a MSP430F5529 controller interfacing with spi communications( 4 wire communications).

I have to send 32 bit data and also recieve the 32 bit data on SOMI(RX) pin.

I have send the data of 32 bit along with address , but when i recieve the data it only recieve 8 bit data on somi pin. I request you kindly check my code or give me some idea how to recieve 32 bit data on somi pins.

For setup SPI communication i am using the following registers as well as whole codes

#include <msp430.h>

short int arry[32]={0};
short int *value=arry;
unsigned int i=0,size=0,Flag=0;

void PinSetup()
{
/*CS1*/
P4DIR|=BIT0;
/*CS2*/
P3DIR|=BIT7;
P3OUT|=BIT7;
/*CS3*/
P3DIR|=BIT6;
P3OUT|=BIT6;

}
void init_UCB1(void)
{
P4SEL|=BIT1+BIT2+BIT3;
UCB1CTL1 |= UCSWRST;
UCB1CTL0 = UCCKPH + UCCKPL + UCMST + UCMODE_1 + UCSYNC; //UCB0CTL0 |= UCMST+UCSYNC+UCCKPL+UCMSB;
UCB1CTL1 = UCSSEL_2;
//UCB0BR0 = 255;
UCB1CTL1 &=~UCSWRST;
UCB1IE |= UCRXIE;
}
void send( int data,int i)
{
int l;
__disable_interrupt();
l=data;
l=l>>8;
while(i){
while(!( UCB1IFG & UCTXIFG));
UCB1TXBUF = l;
l=data;
i--;
}
while(UCB1STAT & UCBUSY);
__enable_interrupt();

}
void send_8bit( int data,int i)
{
__disable_interrupt();
while(i){
while(!( UCB1IFG & UCTXIFG));
UCB1TXBUF = data;
i--;
}
while(UCB1STAT & UCBUSY);
__enable_interrupt();
}

void main(void)
{

WDTCTL = WDTPW + WDTHOLD;
PinSetup();
init_UCB1();

/*Custmer access code (0x4F70656E) WITH ADDRESS 0x2F*/
P4OUT&=~BIT0;
/*READ_1 && WRITE_0*/
send_8bit(0x2F,1);

send(0x6E65,2);
send(0x704F,2);
// P4OUT|=BIT0;

while(1){
// __delay_cycles(1234);
P4OUT&=~BIT0;
send_8bit(0xA0,1);//? READ OR WRITE??
send(0x0000,2);
send(0x0000,2);
// __delay_cycles(4321);
// P4OUT|=BIT0;
value=arry;

}

}

#pragma vector=USCI_B1_VECTOR
__interrupt void USCI_B1_ISR(void)
{
switch(__even_in_range(UCB1IV,4))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
// for(i=0;i<32;i++)
// {
// if(i==32){
// Flag=1;
// UCB1IFG &=~ UCRXIFG;
// break;}

while (!(UCB1IFG & UCTXIFG));
*value = UCB1RXBUF;
value++;
// }
// __bis_SR_register(GIE);
break;

case 4:break; // Vector 4 - TXIFG
default: break;
}
}

Kindly suggest me a answer so that i am able to read 32 bit data on SOMI pins.

waiting for your positive response

Vikash chandra raman

Comcon industries

New -Delhi