solve this with online visual-paradigm /state machine diagram software

1.Based on your understanding of state diagram for the update-time() function, create a state diagram for the scankeyboard() function, assuming that this function is called periodically, frequently enough so that all the user's button presses are caught by the Alarm clock embedded system. Explain the thought process you went through to create the state diagram. 2. Draw a timing diagram for a write operation on a bus in which the write takes two wait states 3.Draw a timing diagram that shows a complete DMA operation, including handing off the bus to the DMA controller, performing the DMA transfer, and returning bus control back to the CPU. 4.Draw a timing diagram with the following signals (where [t1,t2] is the time interval starting at t1 and ending at t2): a.signal A is stable [0,10], changing [10,15], stable [15,30] b.signal B is 1[0,5], falling [5,7],0[7,20], changing [20,30] c.signal C is changing [0,10],0[10,15], rising [15,18],1[18,25], changing [25,30]