CODEWITHSUNDEEP
assemblyembeddeduartmsp430jtag
Yashwanth B
Yashwanth B

Reputation: 1

UART read isn’t working without JTAG in msp430

I'm trying to use UART in my MSP-EXP430G2ET dev board that runs on msp430g2553 microcontroller. The UART works fine while debugging with the JTAG but when I close my debug environment and unplug my dev board and re plug it, my board resets every time it receives something over UART. How do I rectify this error ?

Transmitting through UART posed no problem but when I try to read through UART, my dev board resets.

.section .resetvec,"ax",@progbits
.word _start

.section .text
.global _start
.global _isr_uart_rx

_start:
    mov #0x0280,R1
    mov.w #0x5A80,&0x0120
    bis.b #0x01,&0x0061
    bis.b #0x80,&0x0061
    mov.b #0x00,&0x0060
    mov.b #0x68,&0x0062
    mov.b #0x00,&0x0063
    mov.b #0x02,&0x0064
    mov.b #0x45,&0x0022
    bic.b #0x02,&0x0022
    bic.b #0x41,&0x0021
    mov.b #0x08,&0x0024
    mov.b #0x08,&0x0025
    mov.b #0x06,&0x0026
    mov.b #0x06,&0x0041
    mov.b #0x08,&0x0027
    bic.b #0x01,&0x0061
    bis.b #0x01,&0x0001
    bis.b #0x40,&0x0021
    eint

exit:
    jmp exit

_isr_uart_rx:
    mov.b #0x01,&0x0021
    mov.b &0x66,R5
    bic.b #0x01,&0x0003
    reti

.section .uart0rxvector,"ax",@progbits
.word _isr_uart_rx

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