Assembly - lptm4c1230c3pm board

[baronleonardo]

I want to program pure assembly on lptm4c1230c3pm board but it gets me lots of error complaining about the .asm file it acts like it doesn't know what is that!

[valeros]

@baronleonardo Could you please share your ASM code example?

[baronleonardo]

;=========================================================================================================
; Blink in Assembly
; By Ricardo Angeli (03/04/15)
; Designed for Tiva Connected Launchpad (TM4C1294NCPDT)
;=========================================================================================================
; Description:
; Blinks an onboard LED at an approximate rate of once
; per second.  Designed as a test for an assembly-only
; program on the Launchpad.
;=========================================================================================================

    .global  main                                   ; makes main accessible from outside this file.
    .thumb                                          ; use thumb, duh

    .text                                           ; set memory location to flash
    .align 4                                        ; align on 32-bit boundary

;=========================================================================================================
; Hardware Constants
;=========================================================================================================
GPIO_PORTJ_DATA_R             .field 0x400603FC,32
GPIO_PORTJ_DIR_R              .field 0x40060400,32
GPIO_PORTJ_AFSEL_R            .field 0x40060420,32
GPIO_PORTJ_PUR_R              .field 0x40060510,32
GPIO_PORTJ_DEN_R              .field 0x4006051C,32
GPIO_PORTJ_AMSEL_R            .field 0x40060528,32
GPIO_PORTJ_PCTL_R             .field 0x4006052C,32
PJ0                           .field 0x40060004,32
PJ1                           .field 0x40060008,32
SWITCHES                      .field 0x4006000C,32
SW1_PRESSED                   .equ 0x02              ; value read from location SWITCHES when just SW1 is
                                                     ; pressed.
SW2_PRESSED                   .equ 0x01              ; value read from location SWITCHES when just SW2 is
                                                     ; pressed.
BOTH_PRESSED                  .equ 0x00              ; value read from location SWITCHES when both
                                                     ; switches are pressed
NO_PRESSED                    .equ 0x03              ; value read from location SWITCHES when neither
                                                     ; switch is pressed.
GPIO_PORTN_DATA_R             .field 0x400643FC,32
GPIO_PORTN_DIR_R              .field 0x40064400,32
GPIO_PORTN_AFSEL_R            .field 0x40064420,32
GPIO_PORTN_DEN_R              .field 0x4006451C,32
GPIO_PORTN_AMSEL_R            .field 0x40064528,32
GPIO_PORTN_PCTL_R             .field 0x4006452C,32
PN0                           .field 0x40064004,32
PN1                           .field 0x40064008,32
LEDS                          .field 0x4006400C,32
LED1_ON                       .equ 0x02               ; value written to location PN1 or LEDS to turn on
                                                      ; LED1.
LED2_ON                       .equ 0x01               ; value written to location PN0 or LEDS to turn on
                                                      ; LED2.
SYSCTL_RCGCGPIO_R             .field 0x400FE608,32
SYSCTL_RCGCGPIO_R12           .equ 0x00001000         ; GPIO Port N Run Mode Clock Gating Control
SYSCTL_RCGCGPIO_R8            .equ 0x00000100         ; GPIO Port J Run Mode Clock Gating Control
SYSCTL_PRGPIO_R               .field 0x400FEA08,32
SYSCTL_PRGPIO_R12             .equ 0x00001000         ; GPIO Port N Peripheral Ready
SYSCTL_PRGPIO_R8              .equ 0x00000100         ; GPIO Port J Peripheral Ready

;=========================================================================================================
; Custom Constants
;=========================================================================================================
CPU_FREQ                      .field 8000000,32       ; Current CPU clockspeed stored in Hertz

;=========================================================================================================
; Program Code
;=========================================================================================================
        .align 2                                      ; align on 16-bit boundary

main:                                                 ; must be called main to execute on its own

        push {r0-r2, lr}                              ; push registers we will use into the stack,
                                                      ; useful for integrating within C code.

        ; Enable GPIO port
        ldr r0, SYSCTL_RCGCGPIO_R
        mov r1, #SYSCTL_RCGCGPIO_R12
        str r1, [r0]

        ; Wait a few cycles for the peripheral to be enabled
        nop
        nop
        nop
        nop
        nop

        ldr r0, GPIO_PORTN_DIR_R
        mov r1, #0x01
        str r1, [r0]

        ldr r0, GPIO_PORTN_DEN_R
        mov r1, #0x01
        str r1, [r0]

        ldr r0, GPIO_PORTN_DATA_R

blink:
        ; Turn on the LED
        orr r1, r1, #LED2_ON
        str r1, [r0]

        ; Initiate wait drive!
        ldr r2, CPU_FREQ                              ; load number of cycles we want to wait
wait1:
        sub r2, r2, #10                               ; subtract 10 every 10 cycles
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        cmp r2, #0
        bgt wait1

        ; Turn off the LED
        bic r1, r1, #LED2_ON
        str r1, [r0]

        ; Initiate wait drive!
        ldr r2, CPU_FREQ                              ; load number of cycles we want to wait
wait2:
        sub r2, r2, #10                               ; subtract 10 every 10 cycles
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        cmp r2, #0
        bgt wait2                                     ; loop back unless r2 <= 0

        ; loop to the beginning of the blink routine all over again
        b blink

        ; if calling this assembly program from C, this would pop back used registers and return back to C
        pop {r0-r2, lr}
        mov pc,lr

[valeros]

1. Ensure that the assembly code filename has a .S suffix.
2. Are you sure this example is written according to GCC assembler syntax? Looks like it's written for TI compiler.

[baronleonardo]

I tried .S suffix still the same problem it doesn't even understand that ; means a comment!

[valeros]

Looks like ; isn't a valid comment section in GCC asm. Here is GNU ARM Assembler Quick Reference

[baronleonardo]

I'm so sorry .. my mistake thanks for your help :-)