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Honored Contributor I
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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; 

}
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