4A. Assume that columns of a 3x3 matrix keyboard are connected to P0.0-P0.2 and rows are...

 

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4A. Assume that columns of a 3x3 matrix keyboard are connected to P0.0-P0.2 and rows are connected to P1.0-P1.2, write an embedded C program using GPIO interrupt to display the 5 key code of the key pressed on a seven segment display. ICT 3102 Page 1 of 2 4B. Assume that a switch is connected to P2.12. Write an embedded C program to generate a sinusoidal waveform at Aour (P0.26, function-3) with peak to peak amplitude of 2 volts and DC value of 1.2 volts. The frequency of the waveform is controlled by the switch as mentioned in the Table Q.4B. Table Q.4B Frequency 2 kHz 4 kHz Switch status ON OFF 3 4A. Assume that columns of a 3x3 matrix keyboard are connected to P0.0-P0.2 and rows are connected to P1.0-P1.2, write an embedded C program using GPIO interrupt to display the 5 key code of the key pressed on a seven segment display. ICT 3102 Page 1 of 2 4B. Assume that a switch is connected to P2.12. Write an embedded C program to generate a sinusoidal waveform at Aour (P0.26, function-3) with peak to peak amplitude of 2 volts and DC value of 1.2 volts. The frequency of the waveform is controlled by the switch as mentioned in the Table Q.4B. Table Q.4B Frequency 2 kHz 4 kHz Switch status ON OFF 3