Revision 0:6d43d111bdc1, committed 2010-01-20

Comitter:

macaba

Date:

Wed Jan 20 11:44:57 2010 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2s/dma.cpp	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,151 @@
+/*****************************************************************************
+ *   dma.c:  DMA module file for NXP LPC17xx Family Microprocessors
+ *
+ *   Copyright(C) 2009, NXP Semiconductor
+ *   All rights reserved.
+ *
+ *   History
+ *   2009.05.26  ver 1.00    Prelimnary version, first Release
+ *
+******************************************************************************/
+#include "mbed.h"
+#include "type.h"
+#include "i2s.h"
+#include "dma.h"
+
+#if I2S_DMA_ENABLED
+volatile uint32_t DMATCCount = 0;
+volatile uint32_t DMAErrCount = 0;
+volatile uint32_t I2SDMA0Done = 0;
+volatile uint32_t I2SDMA1Done = 0;
+
+/******************************************************************************
+** Function name:		DMA_IRQHandler
+**
+** Descriptions:		DMA interrupt handler
+**
+** parameters:			None
+** Returned value:		None
+** 
+******************************************************************************/
+void DMA_IRQHandler(void) 
+{
+  uint32_t regVal;
+
+  regVal = LPC_GPDMA->DMACIntTCStat;
+  if ( regVal )
+  {
+	DMATCCount++;
+	LPC_GPDMA->DMACIntTCClear |= regVal;
+	if ( regVal & 0x01 )
+	{
+	  I2SDMA0Done = 1;
+	}
+	else if ( regVal & 0x02 )
+	{
+	  I2SDMA1Done = 1;
+	}
+  } 
+
+  regVal = LPC_GPDMA->DMACIntErrStat;
+  if ( regVal )
+  {
+	DMAErrCount++;
+	LPC_GPDMA->DMACIntErrClr |= regVal;
+  }
+
+}
+
+/******************************************************************************
+** Function name:		DMA_Init
+**
+** Descriptions:		
+**
+** parameters:			
+** Returned value:		
+** 
+******************************************************************************/
+uint32_t DMA_Init( uint32_t ChannelNum, uint32_t DMAMode )
+{
+  if ( ChannelNum == 0 )
+  {
+	LPC_GPDMA->DMACIntTCClear = 0x01;   
+	if ( DMAMode == M2P )
+	{
+	  /* Ch0 set for M2P transfer from mempry to I2S TX FIFO. */
+	  LPC_GPDMACH0->DMACCSrcAddr = DMA_SRC;
+	  LPC_GPDMACH0->DMACCDestAddr = DMA_I2S_TX_FIFO;
+	  /* The burst size is set to 1. Terminal Count Int enable */
+	  LPC_GPDMACH0->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x00 << 12) | (0x00 << 15)
+		| (1 << 26) | 0x80000000;
+	}
+	else if ( DMAMode == P2M )
+	{
+	  /* Ch0 set for P2M transfer from I2S RX FIFO to memory. */
+	  LPC_GPDMACH0->DMACCSrcAddr = DMA_I2S_RX_FIFO;
+	  LPC_GPDMACH0->DMACCDestAddr = DMA_DST;
+	  /* The burst size is set to 1. Terminal Count Int enable. */
+	  LPC_GPDMACH0->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x00 << 12) | (0x00 << 15)
+		| (1 << 27) | 0x80000000;
+	}
+	else if ( DMAMode == P2P )
+	{
+	  /* Ch0 set for P2P transfer from I2S DAO to I2S DAI. */
+	  LPC_GPDMACH0->DMACCSrcAddr = DMA_I2S_TX_FIFO;
+	  LPC_GPDMACH0->DMACCDestAddr = DMA_I2S_RX_FIFO;
+	  /* The burst size is set to 32. */
+	  LPC_GPDMACH0->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x04 << 12) | (0x04 << 15) 
+		| 0x80000000;
+	}
+	else
+	{
+	  return ( FALSE );
+	}
+  }
+  else if ( ChannelNum == 1 )
+  {   
+	LPC_GPDMA->DMACIntTCClear = 0x02;
+	if ( DMAMode == M2P )
+	{
+	  /* Ch1 set for M2P transfer from mempry to I2S TX FIFO. */
+	  LPC_GPDMACH1->DMACCSrcAddr = DMA_SRC;
+	  LPC_GPDMACH1->DMACCDestAddr = DMA_I2S_TX_FIFO;
+	  /* The burst size is set to 1. Terminal Count Int enable. */
+	  LPC_GPDMACH1->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x00 << 12) | (0x00 << 15)
+		| (1 << 26) | 0x80000000;
+	}
+	else if ( DMAMode == P2M )
+	{
+	  /* Ch1 set for P2M transfer from I2S RX FIFO to memory. */
+	  LPC_GPDMACH1->DMACCSrcAddr = DMA_I2S_RX_FIFO;
+	  LPC_GPDMACH1->DMACCDestAddr = DMA_DST;
+	  /* The burst size is set to 1. Terminal Count Int enable. */
+	  LPC_GPDMACH1->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x00 << 12) | (0x00 << 15)
+		| (1 << 27) | 0x80000000;
+	}
+	else if ( DMAMode == P2P )
+	{
+	  /* Ch1 set for P2P transfer from I2S DAO to I2S DAI. */
+	  LPC_GPDMACH1->DMACCSrcAddr = DMA_I2S_TX_FIFO;
+	  LPC_GPDMACH1->DMACCDestAddr = DMA_I2S_RX_FIFO;
+	  /* The burst size is set to 32. */
+	  LPC_GPDMACH1->DMACCControl = (DMA_SIZE & 0x0FFF) | (0x04 << 12) | (0x04 << 15) 
+		| 0x80000000;
+	}
+	else
+	{
+	  return ( FALSE );
+	}
+  }
+  else
+  {
+	return ( FALSE );
+  }
+  return( TRUE );
+}
+
+#endif	/* end if DMA_ENABLED */
+
+/******************************************************************************
+**                            End Of File
+******************************************************************************/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2s/dma.h	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,39 @@
+/*****************************************************************************
+ *   dma.h:  Header file for NXP LPC17xx Family Microprocessors
+ *
+ *   Copyright(C) 2009, NXP Semiconductor
+ *   All rights reserved.
+ *
+ *   History
+ *   2009.05.26  ver 1.00    Prelimnary version, first Release
+ *
+******************************************************************************/
+#ifndef __DMA_H 
+#define __DMA_H
+
+/* USB RAM is used for GPDMA operation. */
+//#define DMA_SRC			0x7FD00000	
+//#define DMA_DST			0x7FD01000		
+//#define DMA_I2S_TX_FIFO	0xE0088008
+//#define	DMA_I2S_RX_FIFO	0xE008800C
+
+#define DMA_SRC			0x20080000	
+#define DMA_DST			0x20081000
+#define DMA_I2S_TX_FIFO	0x400A8008
+#define	DMA_I2S_RX_FIFO	0x400A800C
+ 
+#define DMA_SIZE		0x200
+
+/* DMA mode */
+#define M2M				0x00
+#define M2P				0x01
+#define P2M				0x02
+#define P2P				0x03
+
+extern void DMA_IRQHandler( void ); 
+extern uint32_t DMA_Init( uint32_t ChannelNum, uint32_t DMAMode );
+
+#endif /* end __DMA_H */
+/****************************************************************************
+**                            End Of File
+****************************************************************************/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2s/i2s.cpp	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,147 @@
+/*****************************************************************************
+ *   i2s.c:  I2S C file for NXP LPC17xx Family Microprocessors
+ *
+ *   Copyright(C) 2009, NXP Semiconductor
+ *   All rights reserved.
+ *
+ *   History
+ *   2009.05.26  ver 1.00    Prelimnary version, first Release
+ *
+*****************************************************************************/
+#include "mbed.h"
+#include "type.h"
+#include "i2s.h"
+#include "dma.h"
+
+/* treat I2S TX and RX as a constant address, make the code and buffer 
+easier for both DMA and non-DMA test */
+volatile uint8_t *I2STXBuffer = (uint8_t *)(DMA_SRC); 
+volatile uint8_t *I2SRXBuffer = (uint8_t *)(DMA_DST);
+volatile uint32_t I2SReadLength = 0;
+volatile uint32_t I2SWriteLength = 0;
+volatile uint32_t I2SRXDone = 0, I2STXDone = 0;
+
+/*****************************************************************************
+** Function name:		I2S_IRQHandler
+**
+** Descriptions:		I2S interrupt handler, only RX interrupt is enabled
+**						for simplicity.
+**
+** parameters:			None
+** Returned value:		None
+** 
+*****************************************************************************/
+void I2S_IRQHandler (void)  
+{
+  uint32_t RxCount = 0;
+
+  if ( LPC_I2S->I2SSTATE & 0x01 )
+  {
+	RxCount = (LPC_I2S->I2SSTATE >> 8) & 0xFF;
+	if ( (RxCount != RXFIFO_EMPTY) && !I2SRXDone )
+	{
+	  while ( RxCount > 0 )
+	  {
+		if ( I2SReadLength == BUFSIZE )
+		{
+		  LPC_I2S->I2SDAI |= ((0x01 << 3) | (0x01 << 4));
+		  LPC_I2S->I2SIRQ &= ~(0x01 << 0);	/* Disable RX */	
+		  I2SRXDone = 1;
+		  break;
+		}
+		else
+		{
+		  I2SRXBuffer[I2SReadLength++] = LPC_I2S->I2SRXFIFO;
+		}
+		RxCount--;
+	  }
+	}
+  }
+  return;
+}
+
+/*****************************************************************************
+** Function name:		I2SStart
+**
+** Descriptions:		Start I2S DAI and DAO
+**
+** parameters:			None
+** Returned value:		None
+** 
+*****************************************************************************/
+void I2SStart( void )
+{
+  uint32_t DAIValue, DAOValue;
+  
+  /* Audio output is the master, audio input is the slave, */
+  /* 16 bit data, stereo, reset, master mode, not mute. */
+  DAOValue = LPC_I2S->I2SDAO;
+  DAIValue = LPC_I2S->I2SDAI;
+  LPC_I2S->I2SDAO = DAOValue & (~((0x01 << 4)|(0x01 <<3)));
+  /* 16 bit data, stereo, reset, slave mode, not mute. */
+  LPC_I2S->I2SDAI = DAIValue & (~((0x01 << 4)|(0x01 <<3)));
+  return;
+}
+
+/*****************************************************************************
+** Function name:		I2SStop
+**
+** Descriptions:		Stop I2S DAI and DAO
+**
+** parameters:			None
+** Returned value:		None
+** 
+*****************************************************************************/
+void I2SStop( void )
+{
+  uint32_t DAIValue, DAOValue;
+
+  /* Stop the I2S to start. Audio output is master, audio input is the slave. */
+  /* 16 bit data, set STOP and RESET bits to reset the channels */
+  DAOValue = LPC_I2S->I2SDAO;
+  /* Switch to master mode, TX channel, no mute */
+  DAOValue &= ~((0x01 << 5)|(0x01 << 15));
+  DAIValue = LPC_I2S->I2SDAI;
+  DAIValue &= ~(0x01 << 15);
+  LPC_I2S->I2SDAO = (0x01 << 4) | (0x01 << 3) | DAOValue;	/* Master */
+  LPC_I2S->I2SDAI = (0x01 << 4) | (0x01 << 3) | DAIValue;	/* Slave */
+  return;
+}
+
+/*****************************************************************************
+** Function name:		I2SInit
+**
+** Descriptions:		Initialize I2S controller
+**
+** parameters:			None
+** Returned value:		true or false, return false if the I2S
+**						interrupt handler was not installed correctly
+** 
+*****************************************************************************/
+uint32_t I2SInit( void ) 
+{
+
+  /*enable I2S in the PCONP register. I2S is disabled on reset*/
+  LPC_SC->PCONP |= (1 << 27);
+
+  /*connect the I2S sigals to port pins(P0.4-P0.9)*/
+  LPC_PINCON->PINSEL0 &= ~0x000FFF00;
+  LPC_PINCON->PINSEL0 |= 0x00055500;
+
+  /* Please note, in order to generate accurate TX/RX clock rate for I2S, 
+  PCLK and CCLK needs to be carefully reconsidered. For this test 
+  program, the TX is looped back to RX without external I2S device, 
+  clock rate is not critical in this matter. */
+  LPC_I2S->I2STXRATE = 0x241;
+  LPC_I2S->I2SRXRATE = 0x241;
+
+  I2SStop();
+
+  NVIC_EnableIRQ(I2S_IRQn);
+  return( TRUE );
+}
+
+/******************************************************************************
+**                            End Of File
+******************************************************************************/
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2s/i2s.h	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,28 @@
+/*****************************************************************************
+ *   i2s.h:  Header file for NXP LPC17xx Family Microprocessors
+ *
+ *   Copyright(C) 2009, NXP Semiconductor
+ *   All rights reserved.
+ *
+ *   History
+ *   2009.05.26  ver 1.00    Prelimnary version, first Release
+ *
+******************************************************************************/
+#ifndef __I2S_H
+#define __I2S_H
+
+#define I2S_DMA_ENABLED		1
+
+#define BUFSIZE				0x200
+#define RXFIFO_EMPTY		0
+#define TXFIFO_FULL			8
+
+extern void I2S_IRQHandler( void );
+extern void I2SStart( void );
+extern void I2SStop( void );
+extern uint32_t I2SInit( void );
+
+#endif /* end __I2S_H */
+/****************************************************************************
+**                            End Of File
+*****************************************************************************/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2s/type.h	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,33 @@
+/*****************************************************************************
+ *   type.h:  Type definition Header file for NXP LPC17xx Family 
+ *   Microprocessors
+ *
+ *   Copyright(C) 2009, NXP Semiconductor
+ *   All rights reserved.
+ *
+ *   History
+ *   2009.05.25  ver 1.00    Prelimnary version, first Release
+ *
+******************************************************************************/
+#include <stdint.h>
+
+#ifndef __TYPE_H__
+#define __TYPE_H__
+
+#ifndef NULL
+#define NULL    ((void *)0)
+#endif
+
+#ifndef FALSE
+#define FALSE   (0)
+#endif
+
+#ifndef TRUE
+#define TRUE    (1)
+#endif
+
+
+typedef enum {RESET = 0, SET = !RESET} FlagStatus, ITStatus;
+typedef enum {DISABLE = 0, ENABLE = !DISABLE} FunctionalState;
+
+#endif  /* __TYPE_H__ */

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,80 @@
+#include "mbed.h"
+#include "i2s.h"
+#include "type.h"
+#include "dma.h"
+
+extern volatile uint8_t *I2STXBuffer, *I2SRXBuffer;
+extern volatile uint32_t I2SReadLength;
+extern volatile uint32_t I2SWriteLength;
+extern volatile uint32_t I2SRXDone, I2STXDone;
+extern volatile uint32_t I2SDMA0Done, I2SDMA1Done;
+
+DigitalOut myled(LED1);
+
+
+int main() {
+    uint32_t i;
+    /* Configure temp register before reading */
+    for ( i = 0; i < BUFSIZE; i++ ) {	/* clear buffer */
+        I2STXBuffer[i] = i;
+        I2SRXBuffer[i] = 0;
+    }
+
+    if ( I2SInit() == FALSE ) {	/* initialize I2S */
+        while ( 1 );			/* Fatal error */
+    }
+
+#if I2S_DMA_ENABLED
+    /* USB RAM is used for test.
+    Please note, Ethernet has its own SRAM, but GPDMA can't access
+    that. GPDMA can access USB SRAM and IRAM. Ethernet DMA controller can
+    access both IRAM and Ethernet SRAM. */
+    LPC_SC->PCONP |= (1 << 29);	/* Enable GPDMA clock */
+
+    LPC_GPDMA->DMACIntTCClear = 0x03;
+    LPC_GPDMA->DMACIntErrClr = 0x03;
+
+    LPC_GPDMA->DMACConfig = 0x01;	/* Enable DMA channels, little endian */
+    while ( !(LPC_GPDMA->DMACConfig & 0x01) );
+
+    /* on DMA channel 0, Source is memory, destination is I2S TX FIFO,
+    on DMA channel 1, source is I2S RX FIFO, Destination is memory */
+    /* Enable channel and IE bit */
+    DMA_Init( 0, M2P );
+    LPC_GPDMACH0->DMACCConfig |= 0x18001 | (0x00 << 1) | (0x05 << 6) | (0x01 << 11);
+    DMA_Init( 1, P2M );
+    LPC_GPDMACH1->DMACCConfig |= 0x08001 | (0x06 << 1) | (0x00 << 6) | (0x02 << 11);
+
+    NVIC_EnableIRQ(DMA_IRQn);
+
+    I2SStart();
+
+    LPC_I2S->I2SDMA2 = (0x01<<0) | (0x08<<8);	/* Channel 2 is for RX, enable RX first. */
+    LPC_I2S->I2SDMA1 = (0x01<<1) | (0x01<<16);/* Channel 1 is for TX. */
+
+    /* Wait for both DMA0 and DMA1 to finish before verifying. */
+    while ( !I2SDMA0Done || !I2SDMA1Done );
+#else
+    /* Not DMA mode, enable I2S interrupts. */
+    /* RX FIFO depth is 1, TX FIFO depth is 8. */
+    I2SStart();
+    LPC_I2S->I2SIRQ = (8 << 16) | (1 << 8) | (0x01 << 0);
+
+    while ( I2SWriteLength < BUFSIZE ) {
+        while (((LPC_I2S->I2SSTATE >> 16) & 0xFF) == TXFIFO_FULL);
+        LPC_I2S->I2STXFIFO = I2STXBuffer[I2SWriteLength++];
+    }
+
+    I2STXDone = 1;
+    /* Wait for RX and TX complete before comparison */
+    while ( !I2SRXDone || !I2STXDone );
+#endif
+
+    /* Validate TX and RX buffer */
+    for ( i=1; i<BUFSIZE; i++ ) {
+        if ( I2SRXBuffer[i] != I2STXBuffer[i-1] ) {
+            while ( 1 );	/* Validation error */
+        }
+    }
+    return 0;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jan 20 11:44:57 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0