Specifications

Reviewing the Source Code
4-4
4.2 Reviewing the Source Code
Double-click on the volume.c file in the Project View to see the source code
in the right half of the Code Composer Studio window.
Notice the following parts of this example:
❏
After the main function prints a message, it enters an infinite loop. Within
this loop, it calls the dataIO and processing functions.
❏
The processing function multiplies each value in the input buffer by the
gain and puts the resulting values into the output buffer. It also calls the
assembly load routine, which consumes instruction cycles based on the
processingLoad value passed to the routine.
❏
The dataIO function in this example does not perform any actions other
than to return. Rather than using C code to perform I/O, you can use a
Probe Point within Code Composer Studio to read data from a file on the
host into the inp_buffer location.
#include <stdio.h>
#include "volume.h"
/* Global declarations */
int inp_buffer[BUFSIZE]; /* processing data buffers */
int out_buffer[BUFSIZE];
int gain = MINGAIN; /* volume control variable */
unsigned int processingLoad = BASELOAD; /* processing load */
/* Functions */
extern void load(unsigned int loadValue);
static int processing(int *input, int *output);
static void dataIO(void);
/* ======== main ======== */
void main()
{
int *input = &inp_buffer[0];
int *output = &out_buffer[0];
puts("volume example started\n");