LPC18xx/43xx GPDMA Speed test example

Detailed Description

Example description
This example benchmarks the data transfer speed of gpdma against cpu based transfer function memcpy.

UART needs to be setup prior to running the example as the example produces the output to the UART console.

Special connection requirements
There are no special connection requirements for this example.

Build procedures:
LPC18xx/43xx example quickstart for Keil uVision4
LPC18xx/43xx example quickstart for IAR EWARM
LPC18xx/43xx example quickstart for Code Red Xpresso

Supported boards and board setup:
Hitex 1850 evaluation boards
Hitex 4350 evaluation boards
Keil 1857 evaluation boards
Keil 4357 evaluation boards

Submitting LPCOpen issues:
Community support for LPCOpen

Macros
#define	TRANSFER_DST_ADDR   0x28500000
#define	TRANSFER_SRC_ADDR   0x28100000
#define	TRANSFER_SIZE   0x200000
#define	TRANSFER_BLOCK_SZ   (4 * 3 * 1024) /* 3K of data transfered per LLI */
#define	DMA_DESCRIPTOR_COUNT   256

Functions
static void	prepare_src_data (uint32_t *src, int sz)
static int	prepare_dma_desc (uint32_t *dst, const uint32_t *src, uint32_t sz)
static void	print_result (const void *dst, const void *src, int sz, uint32_t stime, uint32_t etime, const char *mode)
void	DMA_IRQHandler (void)
	RIT interrupt handler.
int	main (void)
	Main entry point.

Variables
static uint8_t	ch_no
static DMA_TransferDescriptor_t	desc_array [DMA_DESCRIPTOR_COUNT]
static volatile int	dma_xfer_complete

Macro Definition Documentation

#define DMA_DESCRIPTOR_COUNT   256

Definition at line 74 of file gpdma_speed_test.c.

#define TRANSFER_BLOCK_SZ   (4 * 3 * 1024) /* 3K of data transfered per LLI */

Definition at line 73 of file gpdma_speed_test.c.

#define TRANSFER_DST_ADDR   0x28500000

Definition at line 69 of file gpdma_speed_test.c.

#define TRANSFER_SIZE   0x200000

Definition at line 71 of file gpdma_speed_test.c.

#define TRANSFER_SRC_ADDR   0x28100000

Definition at line 70 of file gpdma_speed_test.c.

Function Documentation

void DMA_IRQHandler

(

void

)

RIT interrupt handler.

Returns

Nothing

Definition at line 148 of file gpdma_speed_test.c.

int main

(

void

)

Main entry point.

Main program body.

Returns

Nothing

Definition at line 158 of file gpdma_speed_test.c.

static int prepare_dma_desc ( uint32_t *  dst, const uint32_t *  src, uint32_t  sz  )

static

Definition at line 95 of file gpdma_speed_test.c.

static void prepare_src_data ( uint32_t *  src, int  sz  )

static

Definition at line 86 of file gpdma_speed_test.c.

static void print_result ( const void *  dst, const void *  src, int  sz, uint32_t  stime, uint32_t  etime, const char *  mode  )

static

Definition at line 124 of file gpdma_speed_test.c.

Variable Documentation

uint8_t ch_no

static

Definition at line 76 of file gpdma_speed_test.c.

DMA_TransferDescriptor_t desc_array[DMA_DESCRIPTOR_COUNT]

static

Definition at line 77 of file gpdma_speed_test.c.

volatile int dma_xfer_complete

static

Definition at line 78 of file gpdma_speed_test.c.