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1. __REG¼òµ¥µÄ˵¾ÍÊÇ»ñµÃºóÃæËùʾÎïÀíµØÖ·Ó³ÉäºóµÄÐéÄâµØÖ·£¬ÀýÈ磺
#define GPLR0 __REG(0x40E00000) /* GPIO Pin-Level Register GPIO<31:0> */
#define GPLR1 __REG(0x40E00004) /* GPIO Pin-Level Register GPIO<63:32> */
#define GPLR2 __REG(0x40E00008) /* GPIO Pin-Level Register GPIO<80:64> */
pxa´¦ÀíÆ÷ÄÚ²¿¼Ä´æÆ÷µÄÎïÀíµØÖ·ºÍÄں˿ռäµÄÐéÄâµØÖ·¶ÔÓ¦¹ØÏµÈçÏÂ:
Intel PXA internal I/O mappings:* 0x40000000 - 0x41ffffff <--> 0xf8000000 - 0xf9ffffff
* 0x44000000 - 0x45ffffff <--> 0xfa000000 - 0xfbffffff
* 0x48000000 - 0x49ffffff <--> 0xfc000000 - 0xfdffffff
2. #define GPLR(x) __REG2(0x40E00000, ((x) & 0x60) >> 3).
»¹ÓÐÒ»¸öת»»µÄ¾ä×Ó#define GPIO_bit(x) (1 << ((x) & 0x1f))
GPIO¹²ÓÐ80¸ö,ËùÒÔ32bitµÄ¼Ä´æÆ÷Ö»ºÃû×é×ö3¸ö. GPIO_BIT¾ÍÊÇ1×óÒÆxλ(²¢ÇÒ²»Òª³¬¹ý32);¶øGPLR(X)ÔòÊǸù¾ÝxµÄÊýÖµ(Õâ¸öÊÇGPIOºÅ,Èç16,37,72)µÃµ½3¸öGPLRÖÐÊôÓÚ¸ÃGPIOµÄGPLRµÄÆðʼµØÖ·,(__REG2¾ÍÊÇ»ñµÃÁ½¸öµØÖ·µÄºÍ).ÕâÑù×Ó¿ÉÒÔͨ¹ýÏÂÃæµÄ¸³Öµ·½·¨:
GPSR(GPIO48_nPOE) = GPIO_bit(GPIO48_nPOE) | GPIO_bit(GPIO49_nPWE);À´ÉèÖÃGPIO48ËùÔÚGPSRµÄ2¸öλ.Õâôһ´ó¶Ñ,ÊÇΪÁËÓõ½GPIOºÅ¶¨ÒåºÃµÄºê.¼òµ¥µÄGPSR3=XXXX|XXXXÒ²ÊÇ¿ÉÒÔµÄ.
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