add sampling.h

main.c

@@ -16,6 +16,7 @@
 #include "Crystalfontz128x128_ST7735.h"
 #include <stdio.h>
 #include "buttons.h"
+#include "sampling.h"
 #include <math.h>
 #include "inc/hw_memmap.h"
 #include "driverlib/gpio.h"

sampling.c

@@ -11,9 +11,8 @@
 #include "inc/hw_memmap.h"
 #include <math.h>
 #include "buttons.h"
+#include "sampling.h"
 
-
-#define ADC_BUFFER_SIZE 2048 // size must be a power of 2
 // index wrapping macro
 #define ADC_BUFFER_WRAP(i) ((i) & (ADC_BUFFER_SIZE - 1))
 // latest sample index

sampling.h

@@ -0,0 +1,11 @@
+#ifndef SAMPLING_H_
+#define SAMPLING_H_
+
+#include <stdint.h>
+
+#define ADC_BUFFER_SIZE 2048 // size must be a power of 2
+
+// initialize ADC and ISR
+void start_sampler(void);
+
+#endif /* SAMPLING_H_ */