MotorDown.s

	INCLUDE core_cm4_constants.s		; Load Constant Definitions
	INCLUDE stm32l476xx_constants.s  
	
	IMPORT	light_update
	IMPORT parser
	
	AREA    motorDown, CODE, READONLY
	EXPORT	motor_down			; make __main visible to linker
	ENTRY
	
motor_down PROC
down_loop
    MOV r7, #0x0     ;resting default values
    MOV r5, #0x0
    MOV r9 , #108
    B down_step
down_step_loop
    ADD r5, r5 ,#0x1
    CMP r5,r9
    BNE down_step
	BEQ motor_down_endl
down_step
    LDR r2, =GPIOA_BASE
    LDR r3, [r2, #GPIO_ODR]
    LDR r2, =GPIOC_BASE
    LDR r4, [r2, #GPIO_ODR]
    ; Clear pins A13, A14, C12, and C10
	BIC r3, #0x6000
	BIC r4,#0x1000
	BIC r4,#0x0400
    ;A
    ORR r3, #0x0000 ;first step
	;C
    ORR r4, #0x1400
    
	LDR r2, =GPIOA_BASE
    STR r3, [r2, #GPIO_ODR]      ; Updating the output pins
    LDR r2, =GPIOC_BASE
    STR r4, [r2, #GPIO_ODR]
	BIC r3, #0x6000
	BIC r4,#0x1000
	BIC r4,#0x0400
    ;delay
    MOV r0, #0xFFFF    ; Initial delay value	
down_delay1
    SUB r0, r0, #1  ; Subtracting  delay counter
    CMP r0, #0 
    BNE down_delay1 
    ORR r3, #0x4000 ;first step
    ORR r4, #0x1000
    LDR r2, =GPIOA_BASE
    STR r3, [r2, #GPIO_ODR]      ; Updating the output pins
    LDR r2, =GPIOC_BASE
    STR r4, [r2, #GPIO_ODR]
	BIC r3, #0x6000
	BIC r4,#0x1000
	BIC r4,#0x0400
    MOV r0, #0xFFFF 
down_delay2
    SUB r0, r0, #1  ; Subtracting  delay counter
    CMP r0, #0 
    BNE down_delay2 
    ORR r3, #0x6000 ;first step
    ORR r4, #0x0000
    LDR r2, =GPIOA_BASE
    STR r3, [r2, #GPIO_ODR]      ; Updating the output pins
    LDR r2, =GPIOC_BASE
    STR r4, [r2, #GPIO_ODR]
	BIC r3, #0x6000
	BIC r4, #0x1000
	BIC r4, #0x0400
    MOV r0, #0xFFFF
down_delay3
    SUB r0, r0, #1  ; Subtracting  delay counter
    CMP r0, #0 
    BNE down_delay3 
    ORR r3, #0x2000 ;first step
    ;C
    ORR r4, #0x0400
    LDR r2, =GPIOA_BASE
    STR r3, [r2, #GPIO_ODR]      ; Updating the output pins
    LDR r2, =GPIOC_BASE
    STR r4, [r2, #GPIO_ODR]
	BIC r3, #0x6000
	BIC r4,#0x1000
	BIC r4,#0x0400
    MOV r0, #0xFFFF 
down_delay4
    SUB r0, r0, #1  ; Subtracting  delay counter
    CMP r0, #0 
    BNE down_delay4
    B down_step_loop
motor_down_endl
	BX LR
	
	
	ENDP
	END