Diff: main.cpp

Revision:

0:db49fab3bd78

Child:

1:0d866e3f26ab

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 09 15:58:33 2010 +0000
@@ -0,0 +1,93 @@
+
+#define SAMPLE_RATE    150000
+
+#include "mbed.h"
+#include "adc.h"
+
+//Initialise ADC to maximum SAMPLE_RATE and cclk divide set to 1
+ADC adc(SAMPLE_RATE, 1);
+
+uint32_t adc_max[6], adc_av[6], adc_min[6];
+int snap = 0;
+
+void min_max_av(int chan, uint32_t value) {
+    static uint64_t adc_tot[6], counter = 0;
+    uint32_t adc_max_tmp[6], adc_av_tmp[6], adc_min_tmp[6];
+    
+    
+    int i, adc_value;
+    
+    for (i=0; i<6; i++) {
+        adc_value = adc.read(adc.channel_to_pin(i));
+        //Update min, max and average records and totals
+        if (adc_value > adc_max_tmp[i]) adc_max_tmp[i] = adc_value;
+        if (adc_value < adc_min_tmp[i]) adc_min_tmp[i] = adc_value;
+        adc_tot[i] += adc_value;
+        counter++;
+        //If snapshot requested then sample data and reset average
+        if (snap) { 
+            adc_av[i] = (int)(adc_tot[i] / counter);
+            adc_max[i] = adc_max_tmp[i];
+            adc_av[i] = adc_av_tmp[i];
+            adc_min[i] = adc_min_tmp[i];
+            adc_max_tmp[i] = 0;
+            adc_min_tmp[i] = 0xFFFF;
+            adc_av_tmp[i] = 0;
+        }
+    }
+    if (snap) counter = 0;
+    snap = 0;
+}
+
+//Show a bargraph of ADC value
+void bar(int value) {
+    int i, j;
+    
+    j = (value * 50) / 4096;
+    
+    if (j > 50) j = 50;
+    if (j < 0) j = 0;
+    
+    for (i = 0; i < j; i++)
+        printf("=");
+     printf("\n");
+}
+
+int main() {
+    int i;
+    
+    printf("\nRequested max sample rate is %u, actual max sample rate is %u.\n",
+        SAMPLE_RATE, adc.actual_sample_rate());
+    adc.append(min_max_av);
+
+    //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");
+    while (1) {
+        snap = 1;
+        wait(0.5);
+        for (i=0; i<6; i++) {
+            printf ("CH %u Min :", i);
+            bar(adc_min[i]);
+            printf ("CH %u Av  :", i);
+            bar(adc_av[i]);
+            printf ("CH %u Max :", i);
+            bar(adc_max[i]);
+            printf("\n");
+        }
+        printf("......................................................\n");    
+        wait(0.5);
+    }
+}