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POPragma and Interrupt Vector Table : TI MSP430
 

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  1. POPragma and Interrupt Vector Table : TI MSP430
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    <p>My program contains few global variables , whose values are set during the interrupt service routine (USCI_A0_ISR()) execution.</p> <p>Once the execution of USCI_A0_ISR() is done , will the global variables hold the value assigned or will be set back to void/0.????</p> <pre><code>//Global variables int ptr = 0; char rxBuffer[16]; int flag = -1; int check[2]; void __set_flag(void) { if (strcmp(rxBuffer,"OK") == 0) flag = 0; else if (strcmp(rxBuffer,"CONNECT") == 0) flag = 1; else if (strcmp(rxBuffer,"NO CARRIER") == 0) flag = 3; else if (strcmp(rxBuffer,"ERROR") == 0) flag = 4; } void __GSM_client(void) { while (flag == -1); if (flag == 0) check[0] = buflen(rxBuffer); } void main(void) { __Buffer_init(); __low_level_init(); //WDT __UART0_init(); //UART __bis_SR_register(GIE); //interrupts enabled __delay_cycles(1000); // wait till UART intial __GSM_client(); __no_operation(); // For debugger } #pragma vector=USCI_A0_VECTOR __interrupt void USCI_A0_ISR(void) { char byte; while (!(UCA0IFG&amp;UCTXIFG)); byte= UCA0RXBUF; UCA0TXBUF = byte; if (byte == '\r') { //push_char(byte); ptr = 0; __set_flag(); //__Buffer_init(); } else{ push_char(byte); } } </code></pre> <p>Here is the code snippet of what I am doing. I am setting the <code>"flag"</code> based on the response obtained . When I see the register view in Code Composer Studio , the <code>"flag"</code> value is set correctly , but if try using the value of <code>"flag"</code> elsewhere the value of <code>"flag "</code> is not reflected.</p> <p>Any pointers over concepts of the interrupt service routine or when loopholes in my coding method appreciated Thanks in Advance <strong><em>AK</em></strong></p>
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    1. CONot an answer to your question, but is it necessary to name all your functions as `__*`? Identifiers beginning with `__` are typically reserved for use by the platform libraries.
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    2. COmost of them intrinsic functions , except for __GSM_client() . Well thanks for bring that point to my notice
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    3. CO`main` has no loop. Is that intentional? If you don't generate the interupt in the first 1000 cycles of operation, you won't see it. (That's only 40 microsec for a 25Mhz processor).
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