I notice now that the GPIO register names in the great mess o' #defines doesn't match with the historical names, or with documentation. This isn't a huge issue, as we don't really care about the GPIO (legacy "slow" GPIO) but rather the FGPIO for most of our purposes. The FGPIO is "correct" and so I only now noticed. The new list o' #defines has them in the format "IODIRx" when the docs and whatnot have them as "IOxDIR"
Ignore, Modify or Replace? /* General Purpose Input/Output (GPIO) */ #define GPIO_BASE_ADDR 0xE0028000 #define IOPIN0 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x00)) #define IOSET0 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x04)) #define IODIR0 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x08)) #define IOCLR0 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x0C)) #define IOPIN1 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x10)) #define IOSET1 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x14)) #define IODIR1 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x18)) #define IOCLR1 (*(volatile unsigned int *)(GPIO_BASE_ADDR + 0x1C))
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