started voltmeter hacking

voltmeters/calc/U.m

@@ -0,0 +1,6 @@
+function u = U(ADU)
+	adu = uint32(ADU)
+	adu *= 3584
+	adu = bitshift(adu, -17);
+	u = uint32(10*adu);
+endfunction

voltmeters/calc/u5.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdint.h>
+
+uint32_t U(uint32_t x){
+	x *= 3584;
+	x >>= 17;
+	return x*10;
+}
+
+int main(int argc, char **argv){
+	uint32_t x = 131072;
+	int i;
+	if(argc > 1){
+		for(i = 1; i < argc; i++){
+			x = atoi(argv[i]);
+			printf("U(%u) = %u\n", x, U(x));
+		}
+	}else printf("U(%u) = %u\n", x, U(x));
+	return 0;
+}