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源码开放学ARM

LASO - Learn ARM with Source Open

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GPIO 输出引脚

General Purpose Input/Output (p92-p352)

1) 237 multi-functional input/output port pins  
	34 general port groups  
2) GPIO <---> peripheral controller (signal mux)  
3) GPIO Block Diagram  
	APB bus (addr + data) *(int *)0xE0000000 = 0x1234;  
	Register File (GPIO SFRs)  
	Mux Control (functional)  
	Interrupt Control (Interrupt cont.)  
4) Pin Mux Description  
	pin name -> GPIO name  
	default function  

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