Simon Blandford / Mbed 2 deprecated ADC_test

Full ADC driver with demo

Dependencies:   mbed

main.cpp@0:a2562dfbf543, 2010-02-10 (annotated)

Committer:
simonb
Date:
Wed Feb 10 13:11:26 2010 +0000
Revision:
0:a2562dfbf543

        

        
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#define SAMPLE_RATE    150000





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#include "mbed.h"





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#include "adc.h"





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DigitalOut int_led(LED1);





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//Initialise ADC to maximum SAMPLE_RATE and cclk divide set to 1





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ADC adc(SAMPLE_RATE, 1);





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//Toggle LED on interrupt





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void led_toggle(int chan, uint32_t value) {





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    int_led = !int_led;





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}





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//Report ADC value on interrupt





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void print_value(int chan, uint32_t value) {





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    printf("ADC interrupt on pin %u, value=%04u.\n", 





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        adc.channel_to_pin_number(chan), (value >> 4) & 0xFFF);





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}





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int main() {





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    int i;





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    printf("Requested max sample rate is %u, actual max sample rate is %u.\n",





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        SAMPLE_RATE, adc.actual_sample_rate());





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    while (1) {





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        //Set up ADC on pin 20





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        adc.setup(p20,1);





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        //Set up ADC on pin 19





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        adc.setup(p19,1);





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        wait(1);





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        //Measure pin 20





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        adc.select(p20);





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        //Start ADC conversion





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        adc.start();





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        //Wait for it to complete





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        while(!adc.done(p20));





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        printf("Measured value on pin 20 is %04u.\n", adc.read(p20));





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        wait(1);





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        //Measure pin 19





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        adc.select(p19);





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        //Start ADC conversion





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        adc.start();





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        //Wait for it to complete





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        while(!adc.done(p19));





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        printf("Measured value on pin 19 is %04u.\n", adc.read(p19));





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        wait(1);





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        //Append an interrupt handler that prints the channel and value





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        adc.append(print_value);





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        //Measure pin 20





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        adc.select(p20);





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        //Enable the interrupt





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        adc.interrupt_state(p20,1);





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        //Start ADC conversion





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        adc.start();





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        //Wait for it to complete





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        while(!adc.done(p20));





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        wait(1);





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        //Unset pin 20





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        adc.setup(p20,0);





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        //Togle LED on each converstion.





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        //Should be 12.5KHz on LED for all 6 pins.





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        //Sample rate=150KHz / 6 channels / 2





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        adc.append(led_toggle);





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        //Prepare for burst mode on all ADC pins





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        adc.startmode(0,0);





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        adc.burst(1);





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        adc.setup(p20,1);





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        adc.setup(p19,1);





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        adc.setup(p18,1);





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        adc.setup(p17,1);





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        adc.setup(p16,1);





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        adc.setup(p15,1);





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        //For burst mode, only one interrupt is required





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        //which can be on any enabled pin. We have enabled all





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        //of them here.





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        adc.interrupt_state(p15,1);





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        printf("Burst mode, printing once per second...\n");





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        for (i=0; i<5; i++)





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        {





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            printf("%04u %04u %04u %04u %04u %04u\n", 





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                adc.read(p20),





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                adc.read(p19),





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                adc.read(p18),





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                adc.read(p17),





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                adc.read(p16),





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                adc.read(p15));





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            wait(1);





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        }





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        adc.burst(0);





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        adc.setup(p20,0);





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        adc.setup(p19,0);





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        adc.setup(p18,0);





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        adc.setup(p17,0);





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        adc.setup(p16,0);





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        adc.setup(p15,0);





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        adc.interrupt_state(p20,0);





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        adc.interrupt_state(p19,0);





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        adc.interrupt_state(p18,0);





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        adc.interrupt_state(p17,0);





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        adc.interrupt_state(p16,0);





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        adc.interrupt_state(p15,0);





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        printf("\n");





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    }





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}