EK-TM4C129EXL: Booting issue

Lidong Yu

Part Number: EK-TM4C129EXL

I am attempting to write assembly code for my EK-TM4C129EXL that will turn on LED’s 3 and 4 when user switch one is pressed, wait a few seconds and then turn off the LED’s. Then if the other user switch is pressed, turn on the other LED’s. I have the C code written and it works. I turned it into assembly and I keep getting the following C file and line pop up:

It is always the same highlighted line (133) and my code does not work. I am not sure why this is happening. I do not see anything wrong with my code. The only thing missing from my code is the timer which I will add later. Here though is my assembly code:

.thumb

.text

.align 4

GPIO_PORTN .word 0x40064000

GPIO_PORTJ .word 0x40060000

GPIO_PORTF .word 0x4005D000

SYSCTL .word 0x400fe000

.align 4

GPIO_PIN_0 .equ (1>>0)

GPIO_PIN_1 .equ (1<<1)

GPIO_PIN_4 .equ (1<<4)

.align 4

LED1_PN1 .equ GPIO_PIN_1

LED2_PN0 .equ GPIO_PIN_0

LED3_PF4 .equ GPIO_PIN_4

LED4_PF0 .equ GPIO_PIN_0

.align 4

SYSCTL_RCGCGPIO_PORTF .equ (1<<5)

SYSCTL_RCGCGPIO_PORTJ .equ (1<<8)

SYSCTL_RCGCGPIO_PORTN .equ (1<<12)

.align 4

PUSH1_PJ0 .equ GPIO_PIN_0

PUSH2_PJ1 .equ GPIO_PIN_1

.align 4

SYSCTL_RCGCGPIO .equ 0x608

GPIO_DIR .equ 0x400

GPIO_PUR .equ 0x510

GPIO_DEN .equ 0x51c

.global main

main:

.align 4

push {R0-R5,LR}

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTN

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTN

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTF

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTF

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTJ

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTJ

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DIR]

orr R0, #LED1_PN1

str R0, [R1, #GPIO_DIR]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DIR]

orr R0, #LED2_PN0

str R0, [R1, #GPIO_DIR]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DIR]

orr R2, #LED3_PF4

str R2, [R3, #GPIO_DIR]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DIR]

orr R2, #LED4_PF0

str R2, [R3, #GPIO_DIR]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DEN]

orr R0, #LED1_PN1

str R0, [R1, #GPIO_DEN]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DEN]

orr R0, #LED2_PN0

str R0, [R1, #GPIO_DEN]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DEN]

orr R2, #LED3_PF4

str R2, [R3, #GPIO_DEN]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DEN]

orr R2, #LED4_PF0

str R2, [R3, #GPIO_DEN]

ldr R5, GPIO_PORTJ

ldr R4, [R5, #GPIO_PUR]

orr R4, #PUSH1_PJ0

orr R4, #PUSH2_PJ1

str R4, [R5, #GPIO_PUR]

ldr R5, GPIO_PORTJ

ldr R4, [R5, #GPIO_DEN]

orr R4, #PUSH1_PJ0

orr R4, #PUSH2_PJ1

str R4, [R5, #GPIO_DEN]

b loop

pop {R0-R5,PC}

loop:

ldr R5, GPIO_PORTJ

ldr R4, [R5, #PUSH2_PJ1]

cmp R4, #0

bne left

ldr R4, [R5, #PUSH1_PJ0]

cmp R0, #0

bne right

b loop

left:

ldr R1, GPIO_PORTN

ldr R0, [R1, #LED1_PN1]

eor R0, #LED1_PN1

str R0, [R1, #LED1_PN1]

ldr R1, GPIO_PORTN

ldr R0, [R1, #LED2_PN0]

eor R0, #LED2_PN0

str R0, [R1, #LED2_PN0]

b loop

right:

ldr R3, GPIO_PORTF

ldr R2, [R3, #LED3_PF4]

eor R2, #LED3_PF4

str R2, [R3, #LED3_PF4]

ldr R3, GPIO_PORTF

ldr R2, [R3, #LED4_PF0]

eor R2, #LED4_PF0

str R2, [R3, #LED4_PF0]

b loop

.end

Any guidance would be appreciated. Thank you.

.thumb

.text

.align 4

GPIO_PORTN .word 0x40064000

GPIO_PORTJ .word 0x40060000

GPIO_PORTF .word 0x4005D000

SYSCTL .word 0x400fe000

.align 4

GPIO_PIN_0 .equ (1>>0)

GPIO_PIN_1 .equ (1<<1)

GPIO_PIN_4 .equ (1<<4)

.align 4

LED1_PN1 .equ GPIO_PIN_1

LED2_PN0 .equ GPIO_PIN_0

LED3_PF4 .equ GPIO_PIN_4

LED4_PF0 .equ GPIO_PIN_0

.align 4

SYSCTL_RCGCGPIO_PORTF .equ (1<<5)

SYSCTL_RCGCGPIO_PORTJ .equ (1<<8)

SYSCTL_RCGCGPIO_PORTN .equ (1<<12)

.align 4

PUSH1_PJ0 .equ GPIO_PIN_0

PUSH2_PJ1 .equ GPIO_PIN_1

.align 4

SYSCTL_RCGCGPIO .equ 0x608

GPIO_DIR .equ 0x400

GPIO_PUR .equ 0x510

GPIO_DEN .equ 0x51c

.global main

main:

.align 4

push {R0-R5,LR}

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTN

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTN

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTF

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTF

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTJ

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, SYSCTL

ldr R0, [R1, #SYSCTL_RCGCGPIO]

orr R0, #SYSCTL_RCGCGPIO_PORTJ

str R0, [R1, #SYSCTL_RCGCGPIO]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DIR]

orr R0, #LED1_PN1

str R0, [R1, #GPIO_DIR]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DIR]

orr R0, #LED2_PN0

str R0, [R1, #GPIO_DIR]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DIR]

orr R2, #LED3_PF4

str R2, [R3, #GPIO_DIR]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DIR]

orr R2, #LED4_PF0

str R2, [R3, #GPIO_DIR]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DEN]

orr R0, #LED1_PN1

str R0, [R1, #GPIO_DEN]

ldr R1, GPIO_PORTN

ldr R0, [R1, #GPIO_DEN]

orr R0, #LED2_PN0

str R0, [R1, #GPIO_DEN]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DEN]

orr R2, #LED3_PF4

str R2, [R3, #GPIO_DEN]

ldr R3, GPIO_PORTF

ldr R2, [R3, #GPIO_DEN]

orr R2, #LED4_PF0

str R2, [R3, #GPIO_DEN]

ldr R5, GPIO_PORTJ

ldr R4, [R5, #GPIO_PUR]

orr R4, #PUSH1_PJ0

orr R4, #PUSH2_PJ1

str R4, [R5, #GPIO_PUR]

ldr R5, GPIO_PORTJ

ldr R4, [R5, #GPIO_DEN]

orr R4, #PUSH1_PJ0

orr R4, #PUSH2_PJ1

str R4, [R5, #GPIO_DEN]

b loop

pop {R0-R5,PC}

loop:

ldr R5, GPIO_PORTJ

ldr R4, [R5, #PUSH2_PJ1]

cmp R4, #0

bne left

ldr R4, [R5, #PUSH1_PJ0]

cmp R0, #0

bne right

b loop

left:

ldr R1, GPIO_PORTN

ldr R0, [R1, #LED1_PN1]

eor R0, #LED1_PN1

str R0, [R1, #LED1_PN1]

ldr R1, GPIO_PORTN

ldr R0, [R1, #LED2_PN0]

eor R0, #LED2_PN0

str R0, [R1, #LED2_PN0]

b loop

right:

ldr R3, GPIO_PORTF

ldr R2, [R3, #LED3_PF4]

eor R2, #LED3_PF4

str R2, [R3, #LED3_PF4]

ldr R3, GPIO_PORTF

ldr R2, [R3, #LED4_PF0]

eor R2, #LED4_PF0

str R2, [R3, #LED4_PF0]

b loop

.end

Any guidance would be appreciated. Thank you.

over 3 years ago

0 Ki over 3 years ago

TI__Guru**** 463761 points

Hello,

Lidong Yu said:
I turned it into assembly and I keep getting the following C file and line pop up:

Lidong Yu said:
It is always the same highlighted line (133) and my code does not work. I am not sure why this is happening.

I'm not sure I understand the scenario. Is execution of the program halting at that line on its own for no apparent reason?

thanks

0 Drew Friedman over 3 years ago

Prodigy 200 points

Hello,

When the assembly code is debugged, that C file pops up highlighting that line. I press the play button, but the code does not seem to be executing on the board. I press the switches, but nothing happens. The program does not seem to be halting, it is not running for any apparent reason.

Thank you for your response,

Drew

0 Ki over 3 years ago in reply to Drew Friedman

TI__Guru**** 463761 points

Drew Friedman said:
When the assembly code is debugged, that C file pops up highlighting that line.

That is the entry point of your application. When a program is loaded, the debugger will set the program counter to the entry point of the program. For example, when i load an example on my Tiva board and disable auto-run to main, it open the same source file and be halted at line 133:

This is expected behavior when auto-run to main is disabled.

Drew Friedman said:
I press the play button, but the code does not seem to be executing on the board

There is some issue with your application. I will bring this thread to the attention of the device experts for further assistance.

thanks

0 Drew Friedman over 3 years ago

Prodigy 200 points

Hello,

Strange, I'm not sure if there is an assembly thing that I need to do in order for it to run to main, but ok.

Thank you for passing on this thread.

Drew

0 Charles Tsai over 3 years ago in reply to Drew Friedman

TI__Guru**** 191066 points

Hi Drew,

What is your reason to build a program using assembly? I really don't see any benefit doing so. As a matter of fact, assembly code is prone to mistakes and takes much longer development time. I haven't really seen anyone on forum doing assembly for an entire project. With the compiler optimizer enabled, I really doubt you will gain much performance with code written in assembly vs the optimized C code. With that said, I will suggest you single step your code after line 133 if you want to debug it. I can't really help in assembly debugging. For the C program, you can compile it to also generate an assembly listing file if you want to see the assembly code.

0 Drew Friedman over 3 years ago

Prodigy 200 points

Hi,

I am writing in assembly for 2 reasons:

I already wrote the code in C and am trying to transfer it over to assembly for practice with assembly. Although it might take longer, I prefer assembly to C as I can manage the software better.
I am applying to jobs and some I have found say that they want assembly knowledge. Since assembly is an option for a project in Code Composer Studio, I thought that that would be a great opportunity to refresh my assembly knowledge.

I can step through my assembly program and see which line is producing the auto-main failure. I know I could find the assembly code from the compiled C code, but I dont want to cheat to the finish. I'd rather do it myself.

Thank you for your assistance,

Drew

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EK-TM4C129EXL: Booting issue