Using the TI Telecom lib on the OMAP L138 DaVinci platform

Further to the above, I have been trying to work with the AER API and have got so far but have been stopped by an error return from the aerNew() function call. I get a return value of 1 which from the AER codes description is  aer_ERR_NOTCREATED. This suggests that aerCreate has not be called but it has been.

#include <stdio.h> 
#include <stdlib.h>
#include "aer.h"

void aerEvent( void *handle, aerInfo_t *pAer_info );
void aerDebug( void *handle, tuint dbgMsg, tuint dbgCode, tuint dbgSize, tuint* pDbgData );

void main(void) {
 
 ecomemBuffer_t *pBuffer = NULL;
 tint numBuffers;
 void **aerInstance = malloc( sizeof( void * ) );
 aerSizeConfig_t sizeCfg;
 aerCreateConfig_t aerCreateCfg;
 aerNewConfig_t aerNewCfg;
 tint aerError = aer_NOERR;
 
 aerCreateCfg.config_bitfield = 0;
 aerCreateCfg.max_sampling_rate = aer_SRATE_16K;
 aerCreateCfg.eventOut = aerEvent;
 aerCreateCfg.debugInfo = aerDebug;
 
 printf("Initialising AER library\n");
 if ( aerCreate( &aerCreateCfg ) != aer_NOERR )
 {
 exit( 1 );
 }
 
 sizeCfg.config_bitfield = 0;
 sizeCfg.max_tail_length = 160 * 125; /* 160 units of 125 usecs must be integral multiple of 20 */
 sizeCfg.max_y2x_delay = 125; /* usec */ 
 
 if ( aerGetSizes( &numBuffers, (const ecomemBuffer_t **) &pBuffer, &sizeCfg ) != aer_NOERR )
 {
 exit( 2 );
 }
 
 aerNewCfg.handle = NULL;
 aerNewCfg.sizeCfg = sizeCfg;
 
 *aerInstance = NULL;
 
 if ( aerError = aerNew( aerInstance, numBuffers, pBuffer, &aerNewCfg ) != aer_NOERR )
 {
 exit( 3 );
 }
 
 if ( aerDelete( aerInstance, numBuffers, pBuffer ) != aer_NOERR )
 {
 exit( 4 );
 }
 
 printf("Closing down the AER library\n");
 return;
}

void aerEvent( void *handle, aerInfo_t *pAer_info )
{
}

void aerDebug( void *handle, tuint dbgMsg, tuint dbgCode, tuint dbgSize, tuint* pDbgData )
{
}

Any suggestions would be really appreciated.

Duncan.

Hi Duncan,

Firstly, error code aer_ERR_NOTCREATED cannot be returned by aerNew(). It can only be returned by aerGetSizes().

Secondly, I don't see from your code how the buffers requested by AER are allocated. That's why aerNew() returns an error. Please refer to the example code in aer/test/siusim/siuaer.c.

In addition, the max_tail_length must be in integral of 160, i.e. 20msec in units of 125-us.

Regards,

Jianzhong

Dear Jianzhong,

Thank you for your answer much appreciated and you have been very helpful in moving things forward.

Sorry about the confusion abut the aer_ERR_NOTCREATED return code. I should have said that the value of the error code returned from aerNew() was 1 and had assumed that since aer_ERR_NOTCREATED has value 1 that this was the error. Does the error code of 1 relate to the buffers not being set up correctly?

It is very useful for me that you have indicated that the key to the aerNew() function returning OK is to set up the buffers are per the siu_alloc_aer_buffs() function in the test application. Is the allocation of the various buffers in the manner done in the test application described in the API? I think if this has not been done, then it would be a very useful addition to the API guide.

Furthermore could you indicate whether the way that the memory is carefully assigned via SECTION directives in the linker command file shipped with the test application is critical to using the library?

I would suggest that the API is shipped with examples of suggested linker file contents for the various C6000 targets.

Thanks again for your help. I will post again with the AER buffer set-up I used on the OMAP L138 to get aerNew() to return successfully for interested API users.

Duncan.

Hi Jianzhong,

You are quite correct. Due to a rather silly error whereby I assigned the return value of the areNew() call in the if condition, I  obtained the result of a successful assignment i.e. 1 rather  revealing the actual error. By altering the source to the following:

aerError = aerNew( aerInstance, numBuffers, pBuffer, &aerNewCfg );
 if ( aerError != aer_NOERR )
 {
 exit( 3 );
 }

The error revealed was ERR_INVALIDPAR. Apologies for this mistake. 

Duncan.