Diff: main.cpp

Revision:

0:a2562dfbf543

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Feb 10 13:11:26 2010 +0000
@@ -0,0 +1,117 @@
+
+#define SAMPLE_RATE    150000
+
+#include "mbed.h"
+#include "adc.h"
+
+DigitalOut int_led(LED1);
+
+//Initialise ADC to maximum SAMPLE_RATE and cclk divide set to 1
+ADC adc(SAMPLE_RATE, 1);
+
+//Toggle LED on interrupt
+void led_toggle(int chan, uint32_t value) {
+    int_led = !int_led;
+}
+
+//Report ADC value on interrupt
+void print_value(int chan, uint32_t value) {
+    printf("ADC interrupt on pin %u, value=%04u.\n", 
+        adc.channel_to_pin_number(chan), (value >> 4) & 0xFFF);
+}
+
+
+int main() {
+    int i;
+    
+    printf("Requested max sample rate is %u, actual max sample rate is %u.\n",
+        SAMPLE_RATE, adc.actual_sample_rate());
+    while (1) {
+    
+        //Set up ADC on pin 20
+        adc.setup(p20,1);
+        //Set up ADC on pin 19
+        adc.setup(p19,1);
+        wait(1);
+        
+        //Measure pin 20
+        adc.select(p20);
+        //Start ADC conversion
+        adc.start();
+        //Wait for it to complete
+        while(!adc.done(p20));
+        printf("Measured value on pin 20 is %04u.\n", adc.read(p20));
+        wait(1);
+
+        //Measure pin 19
+        adc.select(p19);
+        //Start ADC conversion
+        adc.start();
+        //Wait for it to complete
+        while(!adc.done(p19));
+        printf("Measured value on pin 19 is %04u.\n", adc.read(p19));
+        wait(1);
+
+    
+        //Append an interrupt handler that prints the channel and value
+        adc.append(print_value);
+        //Measure pin 20
+        adc.select(p20);
+        //Enable the interrupt
+        adc.interrupt_state(p20,1);
+        //Start ADC conversion
+        adc.start();
+        //Wait for it to complete
+        while(!adc.done(p20));
+        wait(1);
+    
+        //Unset pin 20
+        adc.setup(p20,0);
+    
+        //Togle LED on each converstion.
+        //Should be 12.5KHz on LED for all 6 pins.
+        //Sample rate=150KHz / 6 channels / 2
+        adc.append(led_toggle);
+    
+        //Prepare for burst mode on all ADC pins
+        adc.startmode(0,0);
+        adc.burst(1);
+        adc.setup(p20,1);
+        adc.setup(p19,1);
+        adc.setup(p18,1);
+        adc.setup(p17,1);
+        adc.setup(p16,1);
+        adc.setup(p15,1);
+        //For burst mode, only one interrupt is required
+        //which can be on any enabled pin. We have enabled all
+        //of them here.
+        adc.interrupt_state(p15,1);
+        printf("Burst mode, printing once per second...\n");
+        for (i=0; i<5; i++)
+        {
+            printf("%04u %04u %04u %04u %04u %04u\n", 
+                adc.read(p20),
+                adc.read(p19),
+                adc.read(p18),
+                adc.read(p17),
+                adc.read(p16),
+                adc.read(p15));
+            wait(1);
+        }
+        adc.burst(0);
+        adc.setup(p20,0);
+        adc.setup(p19,0);
+        adc.setup(p18,0);
+        adc.setup(p17,0);
+        adc.setup(p16,0);
+        adc.setup(p15,0);
+        adc.interrupt_state(p20,0);
+        adc.interrupt_state(p19,0);
+        adc.interrupt_state(p18,0);
+        adc.interrupt_state(p17,0);
+        adc.interrupt_state(p16,0);
+        adc.interrupt_state(p15,0);
+        
+        printf("\n");
+    }
+}