Assume that you have an ARM Cortex M processor, with the instruction set as done in the class. Use the bit$-$banding feature of ARM Cortex M processor and create a two functional routines for doing the SPI read and SPI write. Assume that each bit$-$banding bit is an IO $($input or output$)$ of the chip $($like a general purpose IO $[$gpio$]).$

Name the two functional routines as :

$1.$ cm$\_$spi$\_$write$($uint$8$ address, uint$16$ data$)$ ; $//$master write to an address which is $8$bits wide $($uint$8)$ a data value which is $16$bits wide $($uint$16).$

$2.$ uint$16$ cm$\_$spi$\_$read$($uint$8$ address$)$ ; $//$read a uint$1616$bit data from the slave using an $8$bit address

A$.$ Write the functions in C routine as you would normally do to maintain a processor independent code

B$.$ Convert your C routine to Assembly using Compiler techniques. You can also use your intuition, to ensure that the $$C$$ code and assembly should be equivalent in functionality

C$.$ Assume each instruction takes $1$ processor clock cycle, how many clock cycles does it take to do $($a$)$ write function $($b$)$ read function