A four position DIP switch, shown in Fig. 3(a), is used with two mbed microcontr

Question

A four position DIP switch, shown in Fig. 3(a), is used with two mbed microcontrollers connected through SPI port as shown in Fig. 3(b). (a) Draw the circuit diagram of the system. (b) Write the program for the master to continuously receive the status of the switches from the slave microcontroller and display on a PC terminal how many switches are OFF in decimal. Use the default frequency and the mode where CPHA=0 and CPOL=1. (c) Write the program for the slave to transmit the status of the switches to the master.

Explanation / Answer

SLAVE PROGRAM:

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