msgdma st to MM nios code implementation

Problems solved- needed some code clean up...

// Modular Scatter-Gather DMA ST-to-MM with callback function

# include <stdio.h>

// DMA transfer# include <altera_msgdma_descriptor_regs.h># include <altera_msgdma_csr_regs.h># include <altera_msgdma.h>

// Parallel I/O# include <altera_avalon_pio_regs.h># include <sys/alt_irq.h>

# define DMA_LEN_BYTES 1600000 // Size of each DMA transfer in bytes# define BUFFER_A 0x40000000 // SDRAM Buffer A address

// Modular Scatter-Gather DMA Globals

alt_msgdma_dev *DATA_DMA_A;

alt_msgdma_standard_descriptor DATA_DMA_A_desc;

// DMA variables

alt_u32 *DMA_write_addr_ptr_A; // Pointer for DMA A transfer write address

alt_u32 DMA_write_addr_A; // DMA A transfer write address

// Declare callback function

void DATA_DMA_A_callback_function(void* context);

void DATA_DMA_A_callback_function(void* context) {

alt_msgdma_standard_descriptor_async_transfer(DATA_DMA_A, &DATA_DMA_A_desc);

// Toggle PIO

IOWR_ALTERA_AVALON_PIO_DATA(NIOS_DATA1_READY_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(NIOS_DATA1_READY_BASE, 0);

}

int main() {

// Open the streaming modular scatter-gather DMA controllers

DATA_DMA_A = alt_msgdma_open("/dev/data1_msgdma_csr");

if(DATA_DMA_A == NULL)

printf("Could not open the mSG-DMA1\n");

// Configure DMA callback functions

alt_msgdma_register_callback(DATA_DMA_A, DATA_DMA_A_callback_function, 0, NULL);

// Configure the DMA write address

DMA_write_addr_A = (alt_u32) BUFFER_A ;

DMA_write_addr_ptr_A = (alt_u32*)(DMA_write_addr_A);

dma_len_bytes = (alt_u32) DMA_LEN_BYTES;

// Construct the DMA descriptors

alt_msgdma_construct_standard_st_to_mm_descriptor ( DATA_DMA_A,

&DATA_DMA_A_desc, DMA_write_addr_ptr_A, dma_len_bytes,

ALTERA_MSGDMA_DESCRIPTOR_CONTROL_TRANSFER_COMPLETE_IRQ_MASK );

// Start DMA transfers

alt_msgdma_standard_descriptor_async_transfer(DATA_DMA_A, &DATA_DMA_A_desc);

return 0;

}