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jonasdn/init_led.S

Last active August 11, 2020 07:03
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init_led.S
.section .text
.equ GPIO_BASE, 0x10012000 # Memory address of FE310-G002 GPIO
.equ GPIO_RED, 0x400000 # (00000000010000000000000000000000)
.global init_led
init_led:
li t0, GPIO_BASE # li: load the constant GPIO_BASE into t0
li t1, GPIO_RED # Load the constant GPIO_RED into t1
sw t1, 0x08(t0) # To enable GPIO_RED we write a 32bit word with
# the 22bit set to offset 0x08 (output_en)
sw t1, 0x40(t0) # We make the GPIO "active high", by writing
# to offset 0x40 (out_xor)
ret
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