Any help with ahat should be inside these functions using nordic nrf51 in C would be greatly appreciated.

using C language; such as void GPIO_config(pin,dir,input,pull,drive,sense) creating those five inputs as bitshifts as the control using bitshifts for the nRF51 pin schematics for the GPIO.

Create GPIO header and source files that contain functions that allow for: The purpose of these functions is as follows: Success = GPIO_write_bit (pin,value) Write an individual pin high or low Success = GPIO_write_word([pins],word, size_word) Write a word to a know size to a set of pins Success = GPIO_read_bit(pin,&value) Read whether a pin is high or low Success = GPIO_read_word([pins],&word,size_word) Read a set of pins of known size and give the word Success =GPIO_config(pin,dir,input, pull,drive,sense) Configure a single pin in GPIO mode Create GPIO header and source files that contain functions that allow for: The purpose of these functions is as follows: Success = GPIO_write_bit (pin,value) Write an individual pin high or low Success = GPIO_write_word([pins],word, size_word) Write a word to a know size to a set of pins Success = GPIO_read_bit(pin,&value) Read whether a pin is high or low Success = GPIO_read_word([pins],&word,size_word) Read a set of pins of known size and give the word Success =GPIO_config(pin,dir,input, pull,drive,sense) Configure a single pin in GPIO mode