my DMA controller doesn't works

Hi Jack thanks for your correction, I've change the name in both DMA channels according with <system.h> and DMA Channels are free of errors when opening

Now I've tried to send and receive through the Tx & Rx DMA channels using this,

    /* flag used to indicate the transaction is complete */
    static volatile int rx_done = 0;
    // Callback function that obtains notification that the data has
    static void done (void* handle, void* data){
        rx_done++;
    }
    alt_u8 img_buffer;
in main():
            printf ("starting data transfer...\n");
            /* Post the transmit request */
            if ((rc = alt_dma_txchan_send (txchan,img_buffer,128,NULL,NULL)) < 0){
            //if ((rc = alt_dma_txchan_ioctl(txchan,ALT_DMA_TX_ONLY_ON,img_buffer)) < 0            
                printf ("Failed to post transmit request, reason = %i\n", rc);
            }
            /* Post the receive request */
            if ((rc = alt_dma_rxchan_prepare (rxchan,img_buffer,128,done,NULL)) < 0){
            //if ((rc = alt_dma_rxchan_ioctl(rxchan,ALT_DMA_RX_ONLY_ON,img_buffer)) < 0){            
                printf ("Failed to post read request, reason = %i\n", rc);
            }
            /* wait for transfer to complete */
    
            while (!rx_done);
            OSTimeDlyHMSM(0,0,1,50);
            printf ("Transfer successful!\n");  

I've check both alt_dma_txchan_send & alt_dma_txchan_ioctl options, but the program always hangs waiting for DMA done transfer.

I don't know when If I use alt_dma_rxchan_ioctl how to specify the number of bytes to be sent/received