57 lines
953 B
Plaintext
57 lines
953 B
Plaintext
reset:
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br always >main
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nop
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hardfault:
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reti
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nop
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memfault:
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reti
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nop
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timer_interrupt:
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br >timer_interrupt_handler
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nop
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.align
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led_addr: .word 0x000F0000
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timer_counter_addr: .word 0x000F0008
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timer_status_addr: .word 0x000F000C
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dmem_start_addr: .word 0x00000400
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dmem_end_addr: .word 0x000004FF
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priority_mask: .word 0xFFFFFF03
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main:
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// Initialize stack pointer to the end of the data memory
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ldr r12, >dmem_end_addr
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// Set runtime priority
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ldr r0, >priority_mask
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and r14, r0, r14
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ldr r0,>led_addr // LED addr
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ldr r1,>timer_status_addr // Timer addr
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// Set some LEDs
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clr r2
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addi r2, 0x5A
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st08 r0, r2
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// Enable the timer...
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clr r2
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addi r2, 0x1 // enable bit set
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st08 r1, r2
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loop:
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call >loop
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nop
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timer_interrupt_handler:
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// Set LEDs to indicate we reached the timer interrupt
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clr r2
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addi r2, -1
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st08 r0, r2
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reti
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