Buffer Pointers

[sweep123]

Quick question, I have a user defined structure MyData.

typedef struct {
char strStart[25];
char messageType;
char errorCode;
char wordCount;
unsigned short RxBuffer[1];
}MyData;

MyData DATxBuffer;
MyData *ptr_DATxBuffer;

Now I do:-

// Pointer to the data structure
ptr_DATxBuffer = &DATxBuffer;

Now I would like to use an array - circular buffers so how do I set the current pointer to the correct buffer?

MyData DATxBuffer[10]; // 10 buffers
MyData *ptr_DATxBuffer;

Now do I do:-

// Pointer to the data structure
int currentBuffer = 0;
.
.
.
while(1)
{
ptr_DATxBuffer = &DATxBuffer[currentBuffer];
.
.
SendData(ptr_DATxBuffer);
currentBuffer++;
if(currentBuffer > 10)
currentBuffer = 0;

.
.
}

 

[mishou]

currentBuffer must not be greater than 9! (Ir runs from 0 to 9). So:
//instead of
.
if(currentBuffer > 10)
.
// use
.
if(currentBuffer > 9)
.