1. Code analysis (50pts)- Analyze the following code and explain what it does. n
ID: 2291213 • Letter: 1
Question
1. Code analysis (50pts)- Analyze the following code and explain what it does. nclude unsigned char MST Data,SLV Data; int main(void) // Set P 1.0 for LED // Set P1.1 for slave reset P1OUT | = 0x02; PIDIR |=0x03; P3SEL | = 0x31; UCAOCTL1 lUCSSEL 2; UCAOBR0 = 0x02; UCAOBR1 0; UCA0MCTL = 0; UCA0CTL1 &-"UCSVVRST; UCAOIE I=UCRXIE; P1OUT &= ~0x02; P1OUT |= 0x02; delay_cycles(100) MST Data=0x01 SLV Data- 0x00; while (!UCAOIFG&UCTXIFG;)); UCAOTXBUF = MST. Data, bis SR_register(LPMO bits GIE); # pragma vector:USCI-AO-VECTOR interrupt void USCI_A0 ISR(void) switch (even in range(UCAOIV, 4) case 0: break; case 1 while(!UCAOIFG&UCTXIFG;)); if (UCAORX BUF==SLV. Data) P1OUT &= ~0x01; MST Data++ SLV Data++ UCAOTXBUF=MST DataExplanation / Answer
#include <msp430.h>
unsigned char MST_Data,SLV_Data;
int main(void)
{
P1OUT | = 0x02; // Set P1.0 for LED
// Set P1.1 for slave reset
P1DIR | = 0x03;
P3SEL | = 0x31;
UCAOCTL1 | = UCSWRST;
UCAOCTLO | = UCMST+UCSYNC+UCCKPL+UCMSB;
UCAOCTL1 | = UCSSEL_2;
UCAOBRO = 0x02;
UCAOBR1 = 0;
UCAOMCTL = 0;
UCA0CTL1 &= ~UCSWRST;
UCAOIE | = UCRXIE;
P1OUT &= ~0x02;
P1OUT I= 0x02;
_delay_cycles(100);
MST Data= Ox01;
SLV_Data= Ox00;
while(!UCAOIFG&UCTXIFG));
UCAOTXBUF = MST_Data;
_bis_SR_register(LPM0_bits + GIE);
)
#pragma vector=USCI_AO_VECTOR
_interrupt void USCI_AO_ISR(void)
{
switch (_even_in_range(UCAOIV, 4)
{
case 0:
break;
case 1:
while(!UCAOIFG&UCTXIFG));
if (UCAORXBUF=SLV_Data)
P1OUT &= ~0x01;
MST_Data++;
SLV_Data++;
UCAOTXBUF = MST_Data;
break;
case 4:
break;
default: break;
}
}
$nasm -f elf *.asm; ld -m elf_i386 -s -o demo *.o
main.asm:1: error: label or instruction expected at start of line
main.asm:2: error: parser: instruction expected
main.asm:3: error: comma, colon, decorator or end of line expected after operand
main.asm:4: error: invalid decorator token inside braces
main.asm:4: error: label or instruction expected at start of line
main.asm:5: error: parser: instruction expected
main.asm:6: error: label or instruction expected at start of line
main.asm:7: error: parser: instruction expected
main.asm:8: error: parser: instruction expected
main.asm:9: error: parser: instruction expected
main.asm:10: error: parser: instruction expected
main.asm:11: error: symbol `UCAOCTL1' redefined
main.asm:11: error: parser: instruction expected
main.asm:12: error: parser: instruction expected
main.asm:13: error: parser: instruction expected
main.asm:14: error: parser: instruction expected
main.asm:15: error: parser: instruction expected
main.asm:16: error: parser: instruction expected
main.asm:17: error: symbol `P1OUT' redefined
main.asm:17: error: parser: instruction expected
main.asm:18: error: symbol `P1OUT' redefined
main.asm:18: error: parser: instruction expected
main.asm:19: error: parser: instruction expected
main.asm:20: error: parser: instruction expected
main.asm:21: error: parser: instruction expected
main.asm:22: error: parser: instruction expected
main.asm:23: error: parser: instruction expected
main.asm:24: error: parser: instruction expected
main.asm:25: error: label or instruction expected at start of line
main.asm:26: error: label or instruction expected at start of line
main.asm:27: error: parser: instruction expected
main.asm:28: error: invalid decorator token inside braces
main.asm:28: error: label or instruction expected at start of line
main.asm:29: error: parser: instruction expected
main.asm:30: error: invalid decorator token inside braces
main.asm:30: error: label or instruction expected at start of line
main.asm:31: error: parser: instruction expected
main.asm:32: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
main.asm:33: error: symbol `case' redefined
main.asm:33: error: parser: instruction expected
main.asm:34: error: symbol `while' redefined
main.asm:34: error: parser: instruction expected
main.asm:35: error: parser: instruction expected
main.asm:36: error: symbol `P1OUT' redefined
main.asm:36: error: parser: instruction expected
main.asm:37: error: parser: instruction expected
main.asm:38: error: symbol `SLV_Data' redefined
main.asm:38: error: parser: instruction expected
main.asm:39: error: symbol `UCAOTXBUF' redefined
main.asm:39: error: parser: instruction expected
main.asm:40: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
main.asm:40: error: symbol `break' redefined
main.asm:41: error: symbol `case' redefined
main.asm:41: error: parser: instruction expected
main.asm:42: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
main.asm:42: error: symbol `break' redefined
main.asm:43: error: invalid parameter to [default] directive
main.asm:44: error: label or instruction expected at start of line
main.asm:45: error: label or instruction expected at start of line
ld: cannot find *.o: No such file or directory
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