Homework 7 Solution

8 possibe prescaler values switchprescale case 1

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Unformatted text preview: 4 3 : : : : : ADEN ADSC ADFR ADIF ADIE = = = = = 1 0 0 0 0 (enable the ADC) (writing a 0 causes no modification) (One shot mode) (writing a 0 causes no modification) (Disable conversion completion interrupts) Name: Lab Section: // Note: Can used interrupts, but solution must use an ISR properly //Bits 2-0:dADPS2 ADPS1 ADPS0= 111(ADC clk prescalar:16MHz/128=125K) ADCSRA = 0b10000111; // Capture the time of a positive edge while(1) { // Check if A_in is < .5V (i.e. logic 0) if(ADC_Read_value() < VOLTAGE_0_5V) { // wait for A_in > 2V (i.e. logic 1) while(ADC_Read_value() <= VOLTAGE_2_0V) {} rising_edge_time = TCNT1; // Store counter value } } } // Helper function, used to make main easier to understand int ADC_Read_value(void) { // Initiate an ADC conversion ADCSRA |= 0x40; // or 0b01000000 // Wait for the conversion to finish while(ADCSRA & 0x40) {} // Read ADC digital value return ACDW; } Question 4: Edge Detection (10 pts) The following simple block diagram illustrates how one may implement an Input Capture circuit. Name: Lab Section: An example timing diagram for capturing the rising edge of Input_signal is given below. In s...
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