Task 4.4.4 Solution
Dependencies: mbed
main.cpp
- Committer:
- noutram
- Date:
- 2015-09-24
- Revision:
- 0:83a9911ab6ec
File content as of revision 0:83a9911ab6ec:
#include "mbed.h" //Function prototype void doSample1Hz(); //Global objects Serial pc(USBTX, USBRX); AnalogIn POT_ADC_In(A0); DigitalOut led(LED1); #define N 16 //Shared variables volatile static unsigned short sample16 = 0; unsigned int sum = 0; unsigned int count = 0; //The ticker, used to sample data at a fixed rate Ticker t; //Main function int main() { //Set baud rate to 115200 pc.baud(115200); //Set up the ticker - 100Hz t.attach(doSample1Hz, 0.01); while(1) { //Sleep sleep(); //Add new sample to the sum sum += sample16; //Increment the count count++; //Enough to calculate the average? if (count == N) { //Divide sum by 16 unsigned short mean = (sum >> 4); //Display pc.printf("Mean = %hu\n", mean); //Reset sum and count count = sum = 0; } } //end while(1) } //end main //ISR for the ticker - simply there to perform sampling void doSample1Hz() { //Toggle on board led led = !led; //READ ADC as an unsigned integer. //Shift right 4 bits (this is a 12bit ADC) & store in static global variable sample16 = POT_ADC_In.read_u16() >> 4; }