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Application Programming Interface (API)
EXAMPLE 4-2:
LIBRARY USAGE EXAMPLE
// Channel 1 memory structures.
int ecStateMemX1 [EC_XSTATE_MEM_SIZE_INT]
// Channel 2 memory structures
int ecStateMemX2 [EC_XSTATE_MEM_SIZE_INT]
_XBSS(2); /* Step 2 */
_XBSS(2); /* Step 2 */
// Each instance can share the same X and Y scratch memory
int ecScratchX [EC_XSCRATCH_MEM_SIZE_INT] _XBSS(2); /* Step 3 */
int ecScratchY [EC_YSCRATCH_MEM_SIZE_INT] _YBSS(2); /* Step 3 */
.
.
.
void main()
{
EC_init(ecStateMemX1, ecScratchX, EC_ORDER); /* Step 4 */
EC_init(ecStateMemX2, ecScratchX, EC_ORDER); /* Step 4 */
.
.
.
While(1)
{
EC_apply(ecStateMemX1, ecScratchY, nearEndIn1, farEndIn1, EC_TRUE); /* Step 5 */
EC_applyNLP(ecStateMemX1, nearEndIn1, EC_TRUE); /* Step 6 */
EC_apply(ecStateMemX2, ecScratchY, nearEndIn2, farEndIn2, EC_TRUE); /* Step 5 */
EC_applyNLP(ecStateMemX2, nearEndIn2, EC_TRUE); /* Step 6 */
}
}
4.5
REGISTER USAGE
The dsPIC DSC Acoustic Echo Cancellation Library uses and modifies the MODCON,
CORCON, XMODSRT, XMODEND, YMODSRT, YMODEND, and PSVPAG registers.
These registers are saved and restored to their original values after the library has used
them. If these registers are modified by the application in an Interrupt Service
Routine (ISR), the application must save and restore these registers while entering and
exiting the ISR. This will prevent the ISR from corrupting the execution context,
especially if the interrupt has occurred while a library function is executing.
An ISR may access constants in program memory through a Program Space
Visibility (PSV) read operation. In case of dsPIC33F, it is suggested that the application
explicitly manage PSV operations while using the AEC library. The application should
ensure that PSV access is enabled and that the PSVPAG register contains the required
value. In case of dsPIC33E, the library does not use PSV.
? 2004-2011 Microchip Technology Inc.
DS70134F-page 37
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