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31 lines
729 B
31 lines
729 B
;;;-------------------------------------------------
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;; Configure GPIO - PA5 as output (LED)
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;;
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Cfg_GPIO PROC
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PUSH {R0-R2, LR}
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; Enable GPIO clocks
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LDR R2, =RCC_AHBENR ; AHBENR address
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LDR R1, [R2]
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LDR R0, =RCC_AHBENR_IOPAEN ; strange bit names, only on F303
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ORR R1, R0
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STR R1, [R2]
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; Configure MODER
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LDR R2, =GPIOA_MODER
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LDR R1, [R2]
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BIC R1, #GPIO_MODER_MODER5
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LDR R0, =(2_01 << GPIO_MODER_MODER5_ofs); 2_01 = output mode
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ORR R1, R0
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; Store modified value back to MODER
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STR R1, [R2]
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; TODO: can now also configure OType and other registers
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POP {R0-R2, PC}
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ENDP
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;;
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;;;-------------------------------------------------
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END
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