ssptest.c

NXP LPC2378 SSP Demo

/*****************************************************************************
 *   ssptest.c:  main C entry file for NXP LPC23xx/24xx Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2006.07.19  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC23xx.H"                        /* LPC23xx/24xx definitions */
#include "type.h"
#include "irq.h"
#include "ssp.h"
#include "dma.h"

BYTE *src_addr; 
BYTE *dest_addr;

/******************************************************************************
**   Main Function  main()
******************************************************************************/
int main (void)
{
  DWORD i;
    
  SSP0Init();	/* initialize SSP0(SSP) port, share pins with SPI0
				on port0(p0.15-18). */

  /* DMA_SRC and DMA_DST are RAM area shared by both DMA and non DMA operation */  
  src_addr = (BYTE *)DMA_SRC;
  dest_addr = (BYTE *)DMA_DST;
  for ( i = 0; i < BUFSIZE; i++ )
  {
	*src_addr = i;
	*dest_addr = 0;
	src_addr++;
	dest_addr++;
  }
  	
#if DMA_ENABLED
#if !USE_CS
  IOCLR0 = SSP0_SEL;	/* SSEL is output */
#endif
  /* on DMA channel 0, Source is memory, destination is SSPO TX, 
  on DMA channel 1, source is SSP0 RX, Destination is memory */
  /* Enable channel and IE bit */

  DMA_Init( 0, M2P );
  GPDMA_CH0_CFG |= 0x18001 | (0x00 << 6) | (0x05 << 11);
  DMA_Init( 1, P2M );
  GPDMA_CH1_CFG |= 0x08001 | (0x01 << 1) | (0x06 << 11);

  /* Enable DMA TX and RX on SSP0 */
  SSP0DMACR = 0x03;
#if !USE_CS
  IOSET0 = SSP0_SEL;	/* SSEL is output */
#endif
#else
#if !USE_CS
  IOCLR0 = SSP0_SEL;	/* SSEL is output */
#endif
  src_addr = (BYTE *)DMA_SRC;
  dest_addr = (BYTE *)DMA_DST;
  i = 0;
  while ( i <= BUFSIZE )
  {
	/* to check the RXIM and TXIM interrupt, I send a block data at one time 
	based on the FIFOSIZE(8). */
	SSP0Send( (BYTE *)src_addr, FIFOSIZE );
	/* If RX interrupt is enabled, below receive routine can be
	also handled inside the ISR. */
	SSP0Receive( (BYTE *)dest_addr, FIFOSIZE );
	src_addr += FIFOSIZE;
	dest_addr += FIFOSIZE;
	i += FIFOSIZE;
  }
#if !USE_CS
  IOSET0 = SSP0_SEL;	/* SSEL is output */
#endif
#endif
   
  /* verifying write and read data buffer. */
  src_addr = (BYTE *)DMA_SRC;
  dest_addr = (BYTE *)DMA_DST;
  for ( i = 0; i < BUFSIZE; i++ )
  {
	if ( *src_addr++ != *dest_addr++ )
	{
	  while( 1 );			/* Verification failed */
	}
  }
  return 0;
}

/******************************************************************************
**                            End Of File
******************************************************************************/