mSGDMA stride reads/writes

Hi BadOmen... It's me again...

I do feed signal generator to ADC -> then processed by FFT -> read by mSGDMA ST-MM with nios task (double buffered)

void ReadStreamTask() {
	INT8U err;
	reset_dispatcher(MSGDMA_RX_CSR_BASE);
	alt_ic_isr_register(MSGDMA_RX_CSR_IRQ_INTERRUPT_CONTROLLER_ID,
			MSGDMA_RX_CSR_IRQ, msgdma_rx_complete_isr, NULL, NULL);
	enable_global_interrupt_mask(MSGDMA_RX_CSR_BASE);
	Semaphore = OSSemCreate(1);
	Semaphore = OSSemCreate(2);
	while (1) {
		if(msgdma_int_rx == 0) {
			msgdma_int_rx = 1;
			do{
				storage_ptr = (storage_ptr + 1) % 2;
				OSSemPend(Semaphore, 2, &err);
			}while(err == OS_ERR_TIMEOUT);
			IOWR_ALTERA_AVALON_PIO_DATA(PERIPHERAL_SUBSYSTEM_LED_PIO_BASE, 0xff - storage_ptr - 1);
			construct_standard_st_to_mm_descriptor(desc_rx_ptr, SGDMAMemory, 4*NCELL,
					DESCRIPTOR_CONTROL_TRANSFER_COMPLETE_IRQ_MASK | DESCRIPTOR_CONTROL_END_ON_EOP_MASK);
			write_standard_descriptor(MSGDMA_RX_CSR_BASE, MSGDMA_RX_DESCRIPTOR_SLAVE_BASE, desc_rx_ptr);
		}
		else if(msgdma_int_rx == 2) {
			msgdma_int_rx = 0;
			int i;
			err = OSSemPost(Semaphore);
			OSTimeDlyHMSM(0, 0, 0, 5);
		}
	}
	/*
	 * Should not be here as long as while = 1
	 */
	destruct_sgdma();
}

After transferred through ethernet, by simple TCP IP program to draw FFT graph. I've got only some partial data.

			do {
				read_ptr = (read_ptr + 1) % 2;
				OSSemPend(Semaphore, 2, &err);
			} while(err == OS_ERR_TIMEOUT);
//			printf("------------------------------------------\n%d\n------------------------------------------\n", sizeof(iNetworkRadarData.data));
//			printf("Send package 1\n");
			length = sizeof(SGDMAMemory)/2;
			error_code = send(conns->fd, (char*) &length, sizeof(length), 0);
			error_code = send(conns->fd, (char*) &SGDMAMemory, length, 0);
//			printf("Send package 2\n");
			error_code = send(conns->fd, (char*) &length, sizeof(length), 0);
			error_code = send(conns->fd, (char*) &SGDMAMemory + length, length, 0);
			construct_standard_mm_to_st_descriptor(desc_tx_ptr, SGDMAMemory, 4*512,
					DESCRIPTOR_CONTROL_GENERATE_SOP_MASK | DESCRIPTOR_CONTROL_GENERATE_EOP_MASK);
			write_standard_descriptor(MSGDMA_TX_CSR_BASE,
					MSGDMA_TX_DESCRIPTOR_SLAVE_BASE,
					desc_tx_ptr);
//			memset(SGDMAMemory, 0, sizeof(SGDMAMemory));
			err = OSSemPost(Semaphore);
			OSTimeDlyHMSM(0,0,0,5);

Please see the following picture

Thank you...