A convenient method to implement friendly code uses bit-specific addressing. Using this, individual pins of a...

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A convenient method to implement friendly code uses bit-specific addressing. Using this, individual pins of a port can be accessed independently. This feature is available on the Texas Instruments TM4C line of microcontrollers. This bit-specific addressing works on the parallel port data registers. Given the base address for Port A is 0x4000.4000, the bit-specific address of all pins in Port A are shown below. #define PA7 (((volatile unsigned long )0x40004200)) #define PA6 (((volatile unsigned long )0x40004100)) #define PA5 (((volatile unsigned long )0x40004080)) #define PA4 (((volatile unsigned long )0x40004040)) #define PA3 ("((volatile unsigned long )0x40004020)) #define PA2 (((volatile unsigned long )0x40004010)) #define PA1 (((volatile unsigned long )0x40004008)) #define PAO (((volatile unsigned long )0x40004004)) Specify a #define PA71 that allows us to access bits 7 and 1 of Port A. (((volatile unsigned long )0x40004208)) A convenient method to implement friendly code uses bit-specific addressing. Using this, individual pins of a port can be accessed independently. This feature is available on the Texas Instruments TM4C line of microcontrollers. This bit-specific addressing works on the parallel port data registers. Given the base address for Port A is 0x4000.4000, the bit-specific address of all pins in Port A are shown below. #define PA7 (((volatile unsigned long )0x40004200)) #define PA6 (((volatile unsigned long )0x40004100)) #define PA5 (((volatile unsigned long )0x40004080)) #define PA4 (((volatile unsigned long )0x40004040)) #define PA3 ("((volatile unsigned long )0x40004020)) #define PA2 (((volatile unsigned long )0x40004010)) #define PA1 (((volatile unsigned long )0x40004008)) #define PAO (((volatile unsigned long )0x40004004)) Specify a #define PA71 that allows us to access bits 7 and 1 of Port A. (((volatile unsigned long )0x40004208))

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Posted Date: Feb 22, 2023 12:01 AM

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