31 lines
794 B
ArmAsm
31 lines
794 B
ArmAsm
/*
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* Useful debugging macro to .include for blinking LEDs on/off from assembler code
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* (aka 1 bit debugging, yay!)
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*
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* To have this work from initial reset, without needing an iomux call
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* first, choose a pin where iomux defaults to GPIO (ie 0,2,4,5)
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*
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* Current sets on=LOW, as the GPIO2 pin is active low
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*/
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LED_GPIO=2
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GPIO_DIR_SET = 0x6000030c
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GPIO_OUT_SET = 0x60000300
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GPIO_OUT_CLEAR = 0x60000308
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.macro led_op rega, regb, target
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movi \rega, GPIO_DIR_SET
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movi \regb, (1<<LED_GPIO)
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s32i \regb, \rega, 0
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movi \rega, \target
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s32i \regb, \rega, 0
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.endm
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// Turn LED on. rega, regb will be clobbered
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.macro led_off rega, regb
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led_op \rega, \regb, GPIO_OUT_SET
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.endm
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// Turn LED on. rega, regb will be clobbered
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.macro led_on rega, regb
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led_op \rega, \regb, GPIO_OUT_CLEAR
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.endm
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