hobbielektronika / Mbed 2 deprecated 05_comparator_demo

/** comparatorin_demo * Simple program to demonstrate the basic functions * of the analog comparator of the FRDM-KL25Z board. * * Used library: * - ComparatorIn //https://developer.mbed.org/users/frankvnk/code/ComparatorIn/ * written by Frank Vannieuwkerke * * Hardware requirements: * - FRDM-KL25 board * - CdS photoresistor pulled up by 10 k * - Connecect the midpoint of the divider to PTE29 * * 10k CdS photoresistor * +3.3V --/\/\/\---+---/\/\/\---- GND * | * PTE29 * */

Dependencies:   ComparatorIn mbed

Fork of 05_comparator_demo by Istvan Cserny

main.cpp

Committer:
frankvnk
Date:
2013-06-05
Revision:
1:fb35e688f9f4
Parent:
0:e5deffde916d
Child:
2:bb19e60cb933

File content as of revision 1:fb35e688f9f4:

#include "ComparatorIn.h"
#include "mbed.h"

DigitalOut myled(LED1); // Blue
DigitalOut cmpled(LED2); // Green
DigitalOut cmp_en (PTD5);
AnalogIn cmp_lvl (PTB0);
ComparatorIn compi(PTC8, NC); // light sensor comparator input

// Comparator callback function
void cmp_ISR(unsigned int cmp_ret)
{
    printf("\n%02X - Light sensor : %7.5f Volt - ",cmp_ret,cmp_lvl*3.3);
    if ((cmp_ret & CMP_SCR_CFR_MASK)==CMP_SCR_CFR_MASK)
    {
        printf("<INT=Rising edge on HSCMP0>\n");
    }
    if ((cmp_ret & CMP_SCR_CFF_MASK)==CMP_SCR_CFF_MASK)
    {
        printf("<INT=Falling edge on HSCMP0>\n ");
    }
}



int main()
{
    cmp_en = 1;

    compi._callbackISR(&cmp_ISR);               // Set comparator callback to cmp_ISR
    compi.treshold(0x20);                       // Set comparator threshold to 1.65V = 32 * 3.3V / 64

    while(1)
    {
//        printf("InP : %02X - InM : %02X - DACCR : %02X\n",(CMP0->MUXCR & 0x38)>>3,(CMP0->MUXCR & 0x07),(CMP0->DACCR & 0x3f));
        printf("Light sensor : %7.5f Volt\n",cmp_lvl*3.3);
        myled = 1;
        wait(1);
        myled = 0;
        wait(0.2);
        if (compi.status() == 0x01)
        {
            cmpled = 0;
        }
        else
        {
            cmpled = 1;
        }
    }
}