OK,
here is some code that shows the problem.
I use OpenSUSE LEAP 42.1 as the operating system and have both compilers
installed in /opt under 2 different names ("msp430-elf-gcc" for the TI
and "msp-gcc" for the 'old' P.A.Bigot compiler).
Hope it's not too much, I've tried to keep it as small as reasonable
without hiding anything.
The source:
========================================================================================
/*
******************************************************************************
******************************************************************************
Compiler test: msp430-elf-gcc
Includes and Interrupt definition syntax different for 'old' mspgcc
Otherwise identical
******************************************************************************
******************************************************************************
*/
#include <msp430.h>
#include <stdint.h>
/*
******************************************************************************
Programmer information *** DO NOT USE IFDEFS *** (AWK'ed by avrprog etc)
OK to comment out with '//'
******************************************************************************
*/
#define MCU_TARGET msp430g2232
#define LED BIT0 // LED on P1.0
#define TXD BIT1 // TXD on P1.1
#define RXD BIT2 // RXD on P1.2
#define Bit_time 104 // 9600 Baud,
SMCLK=1MHz (1MHz/9600)=104
#define Bit_time_5 52 // Time for
half a bit.
volatile uint16_t BitCnt; // Bit count,
used when transmitting byte
volatile uint16_t TXByte; // Value sent
over UART when
put_char() is called
uint16_t result, status, checksum;
/*
******************************************************************************
Write a character to RS232
******************************************************************************
*/
static void put_char(uint8_t databyte)
{
TXByte = databyte;
TXByte |= 0x100; // Add stop bit
(= 1)
TXByte <<= 1; // Add start
bit (= 0)
BitCnt = 10; // Load Bit
counter, 8 bits + start + stop
P1OUT |= TXD;
TACTL = TASSEL_2 + MC_2; // SMCLK,
continuous mode
TACCR0 = TAR; // Initialize
compare register
TACCR0 += Bit_time; // Set
time of first bit
TACCTL0 = CCIE; // Enable
interrupts
while (TACCTL0 & CCIE ) {}; // Wait
for TX completion (by the
interrupt)
}
/*
******************************************************************************
Main
******************************************************************************
*/
void main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ; // SMCLK = DCO
= 1MHz
P1DIR |= TXD | LED;
_NOP();
_EINT(); // interrupts
enabled
while(1)
{
put_char('+');
}
}
/*
******************************************************************************
Timer A0 interrupt service routine (RS-232 9600 Baud Tx).
Handles Tx bit timing.
******************************************************************************
*/
void __attribute__ ((interrupt (TIMER0_A0_VECTOR))) TIMER0_A0_ISR(void)
{
P1OUT &= ~LED; // Turn LED on
(start of interrupt)
TACCR0 += Bit_time; // Add
Offset to TACCR0
if (BitCnt == 0) // If all bits
TXed
{
TACTL = TASSEL_2; // SMCLK
selected, timer off (for power
consumption)
TACCTL0 &= ~CCIE ; // Disable
interrupt
}
else
{
if (TXByte & 0x01)
P1OUT |= TXD;
else
P1OUT &= ~TXD;
TXByte >>= 1;
BitCnt--;
}
P1OUT |= LED; // Turn LED on
(end of interrupt)
}
========================================================================================
The compile command for msp430-elf-gcc (taken from running my 'make').
msp430-elf-gcc -I/opt/msp430-gcc/include/ -O2 -Wall -g -mmcu=msp430g2232
-Wno-main -minrt -fshort-enums -Wno-unused-function -c -o main.o main.c
msp430-elf-gcc -I/opt/msp430-gcc/include/ -O2 -Wall -g -mmcu=msp430g2232
-Wno-main -minrt -fshort-enums -Wno-unused-function -Wl,-Map,main.map
-o main.elf main.o
msp430-elf-objdump -h -S main.elf > main.lst
The compile command for 'old' mspgcc (taken from running my
'make').msp430-gcc -Os -Wall -g -mmcu=msp430g2232 -Wno-main
-fshort-enums -Wno-unused-function -c -o main.o main.c
msp430-gcc -Os -Wall -g -mmcu=msp430g2232 -Wno-main -fshort-enums
-Wno-unused-function -Wl,-Map,main.map -o main.elf main.o
msp430-objdump -h -S main.elf > main.lst
========================================================================================
Listing for msp430-elf-gcc
main.elf: file format elf32-msp430
Sections:
Idx Name Size VMA LMA File off Algn
0 __interrupt_vector_10 00000002 0000fff2 0000fff2 000002a2 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 __reset_vector 00000002 0000fffe 0000fffe 000002a6 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .rodata 00000000 0000f800 0000f800 000002a8 2**0
CONTENTS, ALLOC, LOAD, DATA
3 .rodata2 00000000 0000f800 0000f800 000002a8 2**0
CONTENTS
4 .text 000001cc 0000f800 0000f800 000000d4 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
5 .data 00000000 00000200 0000f9cc 000002a0 2**0
CONTENTS, ALLOC, LOAD, DATA
6 .bss 0000000a 00000200 0000f9cc 000002a0 2**1
ALLOC
7 .noinit 00000000 0000020a 0000020a 000002a8 2**0
CONTENTS
8 .heap 00000004 0000020a 0000f9cc 000002a2 2**0
ALLOC
9 .MSP430.attributes 00000017 00000000 00000000 000002a8 2**0
CONTENTS, READONLY
10 .comment 00000049 00000000 00000000 000002bf 2**0
CONTENTS, READONLY
11 .debug_aranges 00000020 00000000 00000000 00000308 2**0
CONTENTS, READONLY, DEBUGGING
12 .debug_info 00000c87 00000000 00000000 00000328 2**0
CONTENTS, READONLY, DEBUGGING
13 .debug_abbrev 000001c1 00000000 00000000 00000faf 2**0
CONTENTS, READONLY, DEBUGGING
14 .debug_line 0000026f 00000000 00000000 00001170 2**0
CONTENTS, READONLY, DEBUGGING
15 .debug_frame 000000a0 00000000 00000000 000013e0 2**2
CONTENTS, READONLY, DEBUGGING
16 .debug_str 0000074c 00000000 00000000 00001480 2**0
CONTENTS, READONLY, DEBUGGING
Disassembly of section __interrupt_vector_10:
0000fff2 <__interrupt_vector_10>:
fff2: 8a f8 interrupt service routine at 0xf88a
Disassembly of section .text:
0000f800 <__crt0_start>:
f800: 31 40 00 03 mov #768, r1 ;#0x0300
0000f804 <__crt0_init_bss>:
f804: 3c 40 00 02 mov #512, r12 ;#0x0200
0000f808 <.Loc.74.1>:
f808: 0d 43 clr r13 ;
0000f80a <.Loc.75.1>:
f80a: 3e 40 0a 00 mov #10, r14 ;#0x000a
0000f80e <.Loc.79.1>:
f80e: b0 12 b8 f9 call #63928 ;#0xf9b8
0000f812 <__crt0_call_just_main>:
f812: 0c 43 clr r12 ;
0000f814 <.Loc.181.1>:
f814: b0 12 18 f8 call #63512 ;#0xf818
0000f818 <main>:
#include "twi.c"
#include "util.c"
void main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
f818: b2 40 80 5a mov #23168, &0x0120 ;#0x5a80
f81c: 20 01
0000f81e <.Loc.87.1>:
BCSCTL1 = CALBC1_1MHZ; // Set range
f81e: d2 42 ff 10 mov.b &0x10ff,&0x0057 ;0x10ff
f822: 57 00
0000f824 <.Loc.88.1>:
DCOCTL = CALDCO_1MHZ; // SMCLK = DCO
= 1MHz
f824: d2 42 fe 10 mov.b &0x10fe,&0x0056 ;0x10fe
f828: 56 00
0000f82a <.Loc.90.1>:
P1DIR |= TXD | LED;
f82a: f2 d0 03 00 bis.b #3, &0x0022 ;
f82e: 22 00
0000f830 <.Loc.92.1>:
_NOP();
f830: 03 43 nop
0000f832 <.Loc.93.1>:
_EINT(); // interrupts
enabled
f832: 32 d2 eint
f834: 03 43 nop
0000f836 <.LBB4>:
******************************************************************************
*/
static void put_char(uint8_t databyte)
{
TXByte = databyte;
f836: 7b 40 2b 00 mov.b #43, r11 ;#0x002b
0000f83a <.Loc.62.1>:
TXByte |= 0x100; // Add stop bit
(= 1)
TXByte <<= 1; // Add start
bit (= 0)
BitCnt = 10; // Load Bit
counter, 8 bits + start + stop
f83a: 7f 40 0a 00 mov.b #10, r15 ;#0x000a
0000f83e <.Loc.65.1>:
P1OUT |= TXD;
TACTL = TASSEL_2 + MC_2; // SMCLK,
continuous mode
f83e: 3e 40 20 02 mov #544, r14 ;#0x0220
0000f842 <.Loc.68.1>:
TACCR0 = TAR; // Initialize
compare register
TACCR0 += Bit_time; // Set
time of first bit
TACCTL0 = CCIE; // Enable
interrupts
f842: 7d 40 10 00 mov.b #16, r13 ;#0x0010
0000f846 <.L3>:
******************************************************************************
*/
static void put_char(uint8_t databyte)
{
TXByte = databyte;
f846: 82 4b 02 02 mov r11, &0x0202 ;
0000f84a <.Loc.60.1>:
TXByte |= 0x100; // Add stop bit
(= 1)
f84a: b2 d0 00 01 bis #256, &0x0202 ;#0x0100
f84e: 02 02
0000f850 <.Loc.61.1>:
TXByte <<= 1; // Add start
bit (= 0)
f850: 1c 42 02 02 mov &0x0202,r12 ;0x0202
f854: 0c 5c rla r12 ;
f856: 82 4c 02 02 mov r12, &0x0202 ;
0000f85a <.Loc.62.1>:
BitCnt = 10; // Load Bit
counter, 8 bits + start + stop
f85a: 82 4f 00 02 mov r15, &0x0200 ;
0000f85e <.Loc.64.1>:
P1OUT |= TXD;
f85e: e2 d3 21 00 bis.b #2, &0x0021 ;r3 As==10
0000f862 <.Loc.65.1>:
TACTL = TASSEL_2 + MC_2; // SMCLK,
continuous mode
f862: 82 4e 60 01 mov r14, &0x0160 ;
0000f866 <.Loc.66.1>:
TACCR0 = TAR; // Initialize
compare register
f866: 92 42 70 01 mov &0x0170,&0x0172 ;0x0170
f86a: 72 01
0000f86c <.Loc.67.1>:
TACCR0 += Bit_time; // Set
time of first bit
f86c: b2 50 68 00 add #104, &0x0172 ;#0x0068
f870: 72 01
0000f872 <.Loc.68.1>:
TACCTL0 = CCIE; // Enable
interrupts
f872: 82 4d 62 01 mov r13, &0x0162 ;
0000f876 <.L2>:
while (TACCTL0 & CCIE ) {}; // Wait
for TX completion (by the
interrupt)
f876: b2 b0 10 00 bit #16, &0x0162 ;#0x0010
f87a: 62 01
f87c: e4 27 jz $-54 ;abs 0xf846
f87e: b2 b0 10 00 bit #16, &0x0162 ;#0x0010
f882: 62 01
f884: f8 23 jnz $-14 ;abs 0xf876
f886: 30 40 46 f8 br #0xf846 ;
0000f88a <TIMER0_A0_ISR>:
Handles Tx bit timing.
******************************************************************************
*/
void __attribute__ ((interrupt (TIMER0_A0_VECTOR))) TIMER0_A0_ISR(void)
{
f88a: 0f 12 push r15 ;
0000f88c <.LCFI0>:
f88c: 0e 12 push r14 ;
0000f88e <.LCFI1>:
f88e: 0d 12 push r13 ;
0000f890 <.LCFI2>:
f890: 0c 12 push r12 ;
0000f892 <.LCFI3>:
f892: 0b 12 push r11 ;
0000f894 <.LCFI4>:
f894: 0a 12 push r10 ;
0000f896 <.LCFI5>:
f896: 09 12 push r9 ;
0000f898 <.LCFI6>:
f898: 08 12 push r8 ;
0000f89a <.LCFI7>:
f89a: 07 12 push r7 ;
0000f89c <.LCFI8>:
f89c: 06 12 push r6 ;
0000f89e <.LCFI9>:
f89e: 05 12 push r5 ;
0000f8a0 <.LCFI10>:
f8a0: 04 12 push r4 ;
0000f8a2 <.LCFI11>:
P1OUT &= ~LED; // Turn LED on
(start of interrupt)
f8a2: d2 c3 21 00 bic.b #1, &0x0021 ;r3 As==01
0000f8a6 <.Loc.118.1>:
TACCR0 += Bit_time; // Add
Offset to TACCR0
f8a6: b2 50 68 00 add #104, &0x0172 ;#0x0068
f8aa: 72 01
0000f8ac <.Loc.119.1>:
if (BitCnt == 0) // If all bits
TXed
f8ac: 1c 42 00 02 mov &0x0200,r12 ;0x0200
f8b0: 0c 93 cmp #0, r12 ;r3 As==00
f8b2: 20 24 jz $+66 ;abs 0xf8f4
0000f8b4 <.Loc.126.1>:
TACTL = TASSEL_2; // SMCLK
selected, timer off (for power
consumption)
TACCTL0 &= ~CCIE ; // Disable
interrupt
}
else
{
if (TXByte & 0x01)
f8b4: 92 b3 02 02 bit #1, &0x0202 ;r3 As==01
f8b8: 19 20 jnz $+52 ;abs 0xf8ec
0000f8ba <.Loc.129.1>:
P1OUT |= TXD;
else
P1OUT &= ~TXD;
f8ba: e2 c3 21 00 bic.b #2, &0x0021 ;r3 As==10
0000f8be <.L11>:
TXByte >>= 1;
f8be: 1c 42 02 02 mov &0x0202,r12 ;0x0202
f8c2: b0 12 3c f9 call #63804 ;#0xf93c
f8c6: 82 4c 02 02 mov r12, &0x0202 ;
0000f8ca <.Loc.132.1>:
BitCnt--;
f8ca: b2 53 00 02 add #-1, &0x0200 ;r3 As==11
0000f8ce <.L9>:
}
P1OUT |= LED; // Turn LED on
(end of interrupt)
f8ce: d2 d3 21 00 bis.b #1, &0x0021 ;r3 As==01
0000f8d2 <.Loc.135.1>:
}
f8d2: 34 41 pop r4 ;
f8d4: 35 41 pop r5 ;
f8d6: 36 41 pop r6 ;
f8d8: 37 41 pop r7 ;
f8da: 38 41 pop r8 ;
f8dc: 39 41 pop r9 ;
f8de: 3a 41 pop r10 ;
f8e0: 3b 41 pop r11 ;
f8e2: 3c 41 pop r12 ;
f8e4: 3d 41 pop r13 ;
f8e6: 3e 41 pop r14 ;
f8e8: 3f 41 pop r15 ;
f8ea: 00 13 reti
0000f8ec <.L13>:
TACCTL0 &= ~CCIE ; // Disable
interrupt
}
else
{
if (TXByte & 0x01)
P1OUT |= TXD;
f8ec: e2 d3 21 00 bis.b #2, &0x0021 ;r3 As==10
f8f0: 30 40 be f8 br #0xf8be ;
0000f8f4 <.L12>:
{
P1OUT &= ~LED; // Turn LED on
(start of interrupt)
TACCR0 += Bit_time; // Add
Offset to TACCR0
if (BitCnt == 0) // If all bits
TXed
{
TACTL = TASSEL_2; // SMCLK
selected, timer off (for power
consumption)
f8f4: b2 40 00 02 mov #512, &0x0160 ;#0x0200
f8f8: 60 01
0000f8fa <.Loc.122.1>:
TACCTL0 &= ~CCIE ; // Disable
interrupt
f8fa: b2 f0 ef ff and #65519, &0x0162 ;#0xffef
f8fe: 62 01
f900: 30 40 ce f8 br #0xf8ce ;
0000f904 <__mspabi_srli_15>:
f904: 12 c3 clrc
f906: 0c 10 rrc r12 ;
0000f908 <__mspabi_srli_14>:
f908: 12 c3 clrc
f90a: 0c 10 rrc r12 ;
0000f90c <__mspabi_srli_13>:
f90c: 12 c3 clrc
f90e: 0c 10 rrc r12 ;
0000f910 <__mspabi_srli_12>:
f910: 12 c3 clrc
f912: 0c 10 rrc r12 ;
0000f914 <__mspabi_srli_11>:
f914: 12 c3 clrc
f916: 0c 10 rrc r12 ;
0000f918 <__mspabi_srli_10>:
f918: 12 c3 clrc
f91a: 0c 10 rrc r12 ;
0000f91c <__mspabi_srli_9>:
f91c: 12 c3 clrc
f91e: 0c 10 rrc r12 ;
0000f920 <__mspabi_srli_8>:
f920: 12 c3 clrc
f922: 0c 10 rrc r12 ;
0000f924 <__mspabi_srli_7>:
f924: 12 c3 clrc
f926: 0c 10 rrc r12 ;
0000f928 <__mspabi_srli_6>:
f928: 12 c3 clrc
f92a: 0c 10 rrc r12 ;
0000f92c <__mspabi_srli_5>:
f92c: 12 c3 clrc
f92e: 0c 10 rrc r12 ;
0000f930 <__mspabi_srli_4>:
f930: 12 c3 clrc
f932: 0c 10 rrc r12 ;
0000f934 <__mspabi_srli_3>:
f934: 12 c3 clrc
f936: 0c 10 rrc r12 ;
0000f938 <__mspabi_srli_2>:
f938: 12 c3 clrc
f93a: 0c 10 rrc r12 ;
0000f93c <__mspabi_srli_1>:
f93c: 12 c3 clrc
f93e: 0c 10 rrc r12 ;
f940: 30 41 ret
0000f942 <.L11>:
f942: 3d 53 add #-1, r13 ;r3 As==11
f944: 12 c3 clrc
f946: 0c 10 rrc r12 ;
0000f948 <__mspabi_srli>:
f948: 0d 93 cmp #0, r13 ;r3 As==00
f94a: fb 23 jnz $-8 ;abs 0xf942
f94c: 30 41 ret
0000f94e <__mspabi_srll_15>:
f94e: 12 c3 clrc
f950: 0d 10 rrc r13 ;
f952: 0c 10 rrc r12 ;
0000f954 <__mspabi_srll_14>:
f954: 12 c3 clrc
f956: 0d 10 rrc r13 ;
f958: 0c 10 rrc r12 ;
0000f95a <__mspabi_srll_13>:
f95a: 12 c3 clrc
f95c: 0d 10 rrc r13 ;
f95e: 0c 10 rrc r12 ;
0000f960 <__mspabi_srll_12>:
f960: 12 c3 clrc
f962: 0d 10 rrc r13 ;
f964: 0c 10 rrc r12 ;
0000f966 <__mspabi_srll_11>:
f966: 12 c3 clrc
f968: 0d 10 rrc r13 ;
f96a: 0c 10 rrc r12 ;
0000f96c <__mspabi_srll_10>:
f96c: 12 c3 clrc
f96e: 0d 10 rrc r13 ;
f970: 0c 10 rrc r12 ;
0000f972 <__mspabi_srll_9>:
f972: 12 c3 clrc
f974: 0d 10 rrc r13 ;
f976: 0c 10 rrc r12 ;
0000f978 <__mspabi_srll_8>:
f978: 12 c3 clrc
f97a: 0d 10 rrc r13 ;
f97c: 0c 10 rrc r12 ;
0000f97e <__mspabi_srll_7>:
f97e: 12 c3 clrc
f980: 0d 10 rrc r13 ;
f982: 0c 10 rrc r12 ;
0000f984 <__mspabi_srll_6>:
f984: 12 c3 clrc
f986: 0d 10 rrc r13 ;
f988: 0c 10 rrc r12 ;
0000f98a <__mspabi_srll_5>:
f98a: 12 c3 clrc
f98c: 0d 10 rrc r13 ;
f98e: 0c 10 rrc r12 ;
0000f990 <__mspabi_srll_4>:
f990: 12 c3 clrc
f992: 0d 10 rrc r13 ;
f994: 0c 10 rrc r12 ;
0000f996 <__mspabi_srll_3>:
f996: 12 c3 clrc
f998: 0d 10 rrc r13 ;
f99a: 0c 10 rrc r12 ;
0000f99c <__mspabi_srll_2>:
f99c: 12 c3 clrc
f99e: 0d 10 rrc r13 ;
f9a0: 0c 10 rrc r12 ;
0000f9a2 <__mspabi_srll_1>:
f9a2: 12 c3 clrc
f9a4: 0d 10 rrc r13 ;
f9a6: 0c 10 rrc r12 ;
f9a8: 30 41 ret
0000f9aa <.L12>:
f9aa: 3e 53 add #-1, r14 ;r3 As==11
f9ac: 12 c3 clrc
f9ae: 0d 10 rrc r13 ;
f9b0: 0c 10 rrc r12 ;
0000f9b2 <__mspabi_srll>:
f9b2: 0e 93 cmp #0, r14 ;r3 As==00
f9b4: fa 23 jnz $-10 ;abs 0xf9aa
f9b6: 30 41 ret
0000f9b8 <memset>:
f9b8: 0f 4c mov r12, r15 ;
f9ba: 0e 5c add r12, r14 ;
0000f9bc <.L2>:
f9bc: 0f 9e cmp r14, r15 ;
f9be: 01 20 jnz $+4 ;abs 0xf9c2
0000f9c0 <.Loc.104.1>:
f9c0: 30 41 ret
0000f9c2 <.L3>:
f9c2: cf 4d 00 00 mov.b r13, 0(r15) ;
f9c6: 1f 53 inc r15 ;
0000f9c8 <.LVL4>:
f9c8: 30 40 bc f9 br #0xf9bc ;
========================================================================================
Listing for 'old' mspgcc.
main.elf: file format elf32-msp430
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 000000fa 0000f800 0000f800 000000b4 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .bss 0000000a 00000200 0000f8fa 000001ae 2**1
ALLOC
2 .noinit 00000002 0000020a 0000f8fa 000001ae 2**1
ALLOC
3 .vectors 00000020 0000ffe0 0000ffe0 000001ae 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
4 .comment 00000030 00000000 00000000 000001ce 2**0
CONTENTS, READONLY
5 .debug_aranges 000000a4 00000000 00000000 00000200 2**2
CONTENTS, READONLY, DEBUGGING
6 .debug_info 000005d2 00000000 00000000 000002a4 2**0
CONTENTS, READONLY, DEBUGGING
7 .debug_abbrev 00000169 00000000 00000000 00000876 2**0
CONTENTS, READONLY, DEBUGGING
8 .debug_line 00000340 00000000 00000000 000009df 2**0
CONTENTS, READONLY, DEBUGGING
9 .debug_frame 00000030 00000000 00000000 00000d20 2**1
CONTENTS, READONLY, DEBUGGING
10 .debug_str 000001a1 00000000 00000000 00000d50 2**0
CONTENTS, READONLY, DEBUGGING
11 .debug_loc 00000014 00000000 00000000 00000ef1 2**0
CONTENTS, READONLY, DEBUGGING
12 .debug_ranges 0000000c 00000000 00000000 00000f05 2**0
CONTENTS, READONLY, DEBUGGING
Disassembly of section .text:
0000f800 <__watchdog_support>:
f800: 55 42 20 01 mov.b &0x0120,r5
f804: 35 d0 08 5a bis #23048, r5 ;#0x5a08
f808: 82 45 0a 02 mov r5, &0x020a
0000f80c <__init_stack>:
f80c: 31 40 00 03 mov #768, r1 ;#0x0300
0000f810 <__do_copy_data>:
f810: 3f 40 00 00 mov #0, r15 ;#0x0000
f814: 0f 93 tst r15
f816: 08 24 jz $+18 ;abs 0xf828
f818: 92 42 0a 02 mov &0x020a,&0x0120
f81c: 20 01
f81e: 2f 83 decd r15
f820: 9f 4f fa f8 mov -1798(r15),512(r15);0xf8fa(r15),
0x0200(r15)
f824: 00 02
f826: f8 23 jnz $-14 ;abs 0xf818
0000f828 <__do_clear_bss>:
f828: 3f 40 0a 00 mov #10, r15 ;#0x000a
f82c: 0f 93 tst r15
f82e: 07 24 jz $+16 ;abs 0xf83e
f830: 92 42 0a 02 mov &0x020a,&0x0120
f834: 20 01
f836: 1f 83 dec r15
f838: cf 43 00 02 mov.b #0, 512(r15);r3 As==00, 0x0200(r15)
f83c: f9 23 jnz $-12 ;abs 0xf830
0000f83e <main>:
#include "twi.c"
#include "util.c"
void main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
f83e: b2 40 80 5a mov #23168, &0x0120 ;#0x5a80
f842: 20 01
BCSCTL1 = CALBC1_1MHZ; // Set range
f844: d2 42 ff 10 mov.b &0x10ff,&0x0057
f848: 57 00
DCOCTL = CALDCO_1MHZ; // SMCLK = DCO
= 1MHz
f84a: d2 42 fe 10 mov.b &0x10fe,&0x0056
f84e: 56 00
P1DIR |= TXD | LED;
f850: f2 d0 03 00 bis.b #3, &0x0022 ;#0x0003
f854: 22 00
_NOP();
f856: 03 43 nop
_EINT(); // interrupts
enabled
f858: 32 d2 eint
******************************************************************************
*/
static void put_char(uint8_t databyte)
{
TXByte = databyte;
f85a: b2 40 2b 00 mov #43, &0x0202 ;#0x002b
f85e: 02 02
TXByte |= 0x100; // Add stop bit
(= 1)
f860: b2 d0 00 01 bis #256, &0x0202 ;#0x0100
f864: 02 02
TXByte <<= 1; // Add start
bit (= 0)
f866: 1f 42 02 02 mov &0x0202,r15
f86a: 0f 5f rla r15
f86c: 82 4f 02 02 mov r15, &0x0202
BitCnt = 10; // Load Bit
counter, 8 bits + start + stop
f870: b2 40 0a 00 mov #10, &0x0200 ;#0x000a
f874: 00 02
P1OUT |= TXD;
f876: e2 d3 21 00 bis.b #2, &0x0021 ;r3 As==10
TACTL = TASSEL_2 + MC_2; // SMCLK,
continuous mode
f87a: b2 40 20 02 mov #544, &0x0160 ;#0x0220
f87e: 60 01
TACCR0 = TAR; // Initialize
compare register
f880: 92 42 70 01 mov &0x0170,&0x0172
f884: 72 01
TACCR0 += Bit_time; // Set
time of first bit
f886: b2 50 68 00 add #104, &0x0172 ;#0x0068
f88a: 72 01
TACCTL0 = CCIE; // Enable
interrupts
f88c: b2 40 10 00 mov #16, &0x0162 ;#0x0010
f890: 62 01
while (TACCTL0 & CCIE ) {}; // Wait
for TX completion (by the
interrupt)
f892: b2 b0 10 00 bit #16, &0x0162 ;#0x0010
f896: 62 01
f898: fc 23 jnz $-6 ;abs 0xf892
f89a: df 3f jmp $-64 ;abs 0xf85a
0000f89c <__stop_progExec__>:
f89c: 32 d0 f0 00 bis #240, r2 ;#0x00f0
f8a0: fd 3f jmp $-4 ;abs 0xf89c
0000f8a2 <__ctors_end>:
f8a2: 30 40 f8 f8 br #0xf8f8
0000f8a6 <TIMER0_A0_ISR>:
Handles Tx bit timing.
******************************************************************************
*/
interrupt (TIMER0_A0_VECTOR) TIMER0_A0_ISR(void)
{
f8a6: 0f 12 push r15
P1OUT &= ~LED; // Turn LED on
(start of interrupt)
f8a8: d2 c3 21 00 bic.b #1, &0x0021 ;r3 As==01
TACCR0 += Bit_time; // Add
Offset to TACCR0
f8ac: b2 50 68 00 add #104, &0x0172 ;#0x0068
f8b0: 72 01
if (BitCnt == 0) // If all bits
TXed
f8b2: 1f 42 00 02 mov &0x0200,r15
f8b6: 0f 93 tst r15
f8b8: 07 20 jnz $+16 ;abs 0xf8c8
{
TACTL = TASSEL_2; // SMCLK
selected, timer off (for power
consumption)
f8ba: b2 40 00 02 mov #512, &0x0160 ;#0x0200
f8be: 60 01
TACCTL0 &= ~CCIE ; // Disable
interrupt
f8c0: b2 f0 ef ff and #-17, &0x0162 ;#0xffef
f8c4: 62 01
f8c6: 14 3c jmp $+42 ;abs 0xf8f0
}
else
{
if (TXByte & 0x01)
f8c8: 92 b3 02 02 bit #1, &0x0202 ;r3 As==01
f8cc: 04 24 jz $+10 ;abs 0xf8d6
P1OUT |= TXD;
f8ce: 5f 42 21 00 mov.b &0x0021,r15
f8d2: 6f d3 bis.b #2, r15 ;r3 As==10
f8d4: 03 3c jmp $+8 ;abs 0xf8dc
else
P1OUT &= ~TXD;
f8d6: 5f 42 21 00 mov.b &0x0021,r15
f8da: 6f c3 bic.b #2, r15 ;r3 As==10
f8dc: c2 4f 21 00 mov.b r15, &0x0021
TXByte >>= 1;
f8e0: 1f 42 02 02 mov &0x0202,r15
f8e4: 12 c3 clrc
f8e6: 0f 10 rrc r15
f8e8: 82 4f 02 02 mov r15, &0x0202
BitCnt--;
f8ec: b2 53 00 02 add #-1, &0x0200 ;r3 As==11
}
P1OUT |= LED; // Turn LED on
(end of interrupt)
f8f0: d2 d3 21 00 bis.b #1, &0x0021 ;r3 As==01
}
f8f4: 3f 41 pop r15
f8f6: 00 13 reti
0000f8f8 <_unexpected_>:
f8f8: 00 13 reti
Disassembly of section .vectors:
0000ffe0 <__ivtbl_16>:
ffe0: a2 f8 a2 f8 a2 f8 a2 f8 a2 f8 a2 f8 a2 f8 a2 f8
................
fff0: a2 f8 a6 f8 a2 f8 a2 f8 a2 f8 a2 f8 a2 f8 00 f8
................
------------------------------------------------------------------------------
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