MSP430FR5994: ISR Trap error in SPI communication

Selvakumaran I

Part Number: MSP430FR5994

Hello,

I am trying to send a packet using the SPI communication. But when i am switch from first if condition to the second if condition i am facing a isr_trap error. Please drop your insights on this error.Thanks in advance

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#include <msp430.h> 
#include <stdio.h>
#include <stdint.h>
void init_SPI()
{
    UCB1CTLW0 |=UCSWRST;
    UCB1CTLW0 &=~UCMSB;
    UCB1CTLW0 |=UCMST;
    UCB1CTLW0 |=UCMODE0;
    UCB1CTLW0 |= UCSSEL__SMCLK;
    UCB1BRW   =10;
    P5SEL0 |= BIT0 | BIT1 | BIT2;
    PM5CTL0 &=~LOCKLPM5;
    UCB1CTLW0 &=~UCSWRST;
    UCB1IE |=~UCTXIE;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <msp430.h> 
#include <stdio.h>
#include <stdint.h>

void init_SPI()
{
    UCB1CTLW0 |=UCSWRST;
    UCB1CTLW0 &=~UCMSB;
    UCB1CTLW0 |=UCMST;
    UCB1CTLW0 |=UCMODE0;
    UCB1CTLW0 |= UCSSEL__SMCLK;

    UCB1BRW   =10;

    P5SEL0 |= BIT0 | BIT1 | BIT2;

    PM5CTL0 &=~LOCKLPM5;
    UCB1CTLW0 &=~UCSWRST;

    UCB1IE |=~UCTXIE;

    __bis_SR_register(GIE);
}

/**
 * main.c
 */
void main(void)
{
    WDTCTL = WDTPW | WDTHOLD;   // stop watchdog timer
    int i=0;
    init_SPI();
 while(1)
 {
    if(UCB1IFG & UCTXIFG0)
    {
        UCB1TXBUF |=0X4D;
    }
    if(UCB1IFG & UCTXIFG0)
    {
        UCB1TXBUF |=0X5D;
    }
    if(UCB1IFG & UCTXIFG0)
    {
        UCB1TXBUF |=0X6D;
    }
 }
}

over 4 years ago

0 Jace H over 4 years ago

TI__Guru 56685 points

Hello,

If you are getting into a trap ISR, this typically means you are enabling an ISR without it being addressed in code. This may or may not be related to the exact peripheral you are using.

Please look at the following resources to help with your SPI debug efforts:

Standard code examples for both Controller (formally master) and Peripheral (formally slave) modes can be found here:

Controller: https://dev.ti.com/tirex/explore/node?node=ACHFXHTiNG.iukEIl1BQ2w__IOGqZri__LATEST

Peripheral: https://dev.ti.com/tirex/explore/node?node=ALko.Ii5r1Btorip0B2uYA__IOGqZri__LATEST

Application note on debugging common issues: www.ti.com/lit/slaa734

MSP Academy walking through SPI concepts and connections: https://dev.ti.com/tirex/explore/node?node=ABoxItVDFGQ-S53Y9G-OHg__IOGqZri__LATEST

0 Selvakumaran I over 4 years ago in reply to Jace H

Prodigy 185 points

Thanks jace.Now i sorted out my issue. i just have to delete these two lines

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    UCB1IE |=~UCTXIE;
    __bis_SR_register(GIE);
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    UCB1IE |=~UCTXIE;

    __bis_SR_register(GIE);

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MSP430FR5994: ISR Trap error in SPI communication