110 lines
1.9 KiB
ArmAsm
110 lines
1.9 KiB
ArmAsm
.thumb
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.syntax unified
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.include "gpio_constants.s" // Register-adresser og konstanter for GPIO
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.include "sys-tick_constants.s" // Register-adresser og konstanter for SysTick
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.text
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.global Start
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TENTH_SECOND_FREQUENCY = FREQUENCY / 10
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SYSTICK_LOAD_BASE = SYSTICK_BASE + SYSTICK_LOAD
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SYSTICK_VAL_BASE = SYSTICK_BASE + SYSTICK_VAL
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SYSTICK_CTRL_BASE = SYSTICK_BASE + SYSTICK_CTRL
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GPIO_EXTIPSELH_BASE = GPIO_BASE + GPIO_EXTIPSELH
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GPIO_EXTIFALL_BASE = GPIO_BASE + GPIO_EXTIFALL
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GPIO_IEN_BASE = GPIO_BASE + GPIO_IEN
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GPIO_IFC_BASE = GPIO_BASE + GPIO_IFC
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GPIO_LED_BASE = GPIO_BASE + (LED_PORT * PORT_SIZE) + GPIO_PORT_DOUTTGL
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Start:
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LDR R0, =TENTH_SECOND_FREQUENCY
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LDR R1, =SYSTICK_CTRL_BASE
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LDR R2, =SYSTICK_LOAD_BASE
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LDR R3, =SYSTICK_VAL_BASE
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MOV R4, #0b110
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STR R4, [R1]
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LDR R4, =TENTH_SECOND_FREQUENCY
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STR R4, [R2]
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MOV R4, #1
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STR R4, [R3]
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LDR R0, =GPIO_EXTIPSELH_BASE
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LDR R1, [R0] // 0b xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
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BFI R1, R4, #4, #4 // 0b xxxx xxxx xxxx xxxx xxxx xxxx 0001 xxxx
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STR R1, [R0]
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LDR R0, =GPIO_EXTIFALL_BASE
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LDR R1, [R0]
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ORR R1, 1 << BUTTON_PIN
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STR R1, [R0]
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LDR R0, =GPIO_IEN_BASE
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LDR R1, [R0]
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ORR R1, 1 << BUTTON_PIN
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STR R1, [R0]
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Loop:
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WFI
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B Loop
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.global SysTick_Handler
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.thumb_func
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SysTick_Handler:
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LDR R0, =tenths
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LDR R1, =seconds
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LDR R2, =minutes
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LDR R10, [R0]
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LDR R11, [R1]
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LDR R12, [R2]
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// Tenth
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ADD R10, #1
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CMP R10, #10
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BNE SysTick_Update
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MOV R10, 0
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// LED
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LDR R3, =GPIO_LED_BASE
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LDR R4, =1<<LED_PIN
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STR R4, [R3]
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// Second
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ADD R11, #1
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CMP R11, #60
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BNE SysTick_Update
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MOV R11, 0
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// Minute
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ADD R12, #1
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SysTick_Update:
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STR R10, [R0]
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STR R11, [R1]
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STR R12, [R2]
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BX LR
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.global GPIO_ODD_IRQHandler
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.thumb_func
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GPIO_ODD_IRQHandler:
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LDR R0, =SYSTICK_CTRL_BASE
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LDR R1, [R0]
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EOR R1, #1
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STR R1, [R0]
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LDR R2, =GPIO_IFC_BASE
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MOV R3, 1 << BUTTON_PIN
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STR R3, [R2]
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BX LR
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NOP |