File content as of revision 0:bf7b9fba3924:

/***********************************************************************//**
 * @file		i2s_dma_test.c
 * @purpose		This example describes how to use DMA mode to test the I2S
 * 			  	driver
 * @version		2.0
 * @date		21. May. 2010
 * @author		NXP MCU SW Application Team
 *---------------------------------------------------------------------
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
 **********************************************************************/
#include "lpc17xx_i2s.h"
#include "lpc17xx_libcfg.h"
#include "lpc17xx_gpdma.h"
#include "debug_frmwrk.h"
#include "lpc17xx_pinsel.h"

/* Example group ----------------------------------------------------------- */
/** @defgroup I2S_DMA	I2S_DMA
 * @ingroup I2S_Examples
 * @{
 */

/************************** PRIVATE DEFINITIONS *************************/
/** Max buffer length */
#define BUFFER_SIZE			0x0A
/** DMA transfer size */
#define DMA_SIZE		0x100UL
/** DMA Source Address is AHBRAM1_BASE that used for USB RAM purpose, but
 * it is not used in this example, so this memory section can be used for general purpose
 * memory
 */
#define DMA_SRC			LPC_AHBRAM1_BASE
/** DMA Source Address is (AHBRAM1_BASE + DMA_SIZE) that used for USB RAM purpose, but
 * it is not used in this example, so this memory section can be used for general purpose
 * memory
 */
#define DMA_DST			(DMA_SRC+DMA_SIZE)

/************************** PRIVATE VARIABLES ***********************/
uint8_t menu[]=
	"********************************************************************************\n\r"
	"Hello NXP Semiconductors \n\r"
	" I2S test DMA mode demo \n\r"
	"\t - MCU: LPC17xx \n\r"
	"\t - Core: ARM CORTEX-M3 \n\r"
	"\t - Communicate via: UART0 - 115200 bps \n\r"
	" Use two I2S channels in the same board to transfer data use DMA mode\n\r"
	"********************************************************************************\n\r";

// Terminal Counter flag for Channel 0
__IO uint32_t Channel0_TC;

// Error Counter flag for Channel 0
__IO uint32_t Channel0_Err;

// Terminal Counter flag for Channel 1
__IO uint32_t Channel1_TC;

// Error Counter flag for Channel 1
__IO uint32_t Channel1_Err;

volatile uint32_t *I2STXBuffer = (uint32_t*)(DMA_SRC);
volatile uint32_t *I2SRXBuffer = (uint32_t*)(DMA_DST);

/************************** PRIVATE FUNCTIONS *************************/
void DMA_IRQHandler (void);

void Buffer_Init(void);
Bool Buffer_Verify(void);
void print_menu(void);

/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
/*********************************************************************//**
 * @brief		GPDMA interrupt handler sub-routine
 * @param[in]	None
 * @return 		None
 **********************************************************************/
void DMA_IRQHandler (void)
{
	// check GPDMA interrupt on channel 0
	if (GPDMA_IntGetStatus(GPDMA_STAT_INT, 0)){ //check interrupt status on channel 0
		// Check counter terminal status
		if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 0)){
			// Clear terminate counter Interrupt pending
			GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0);
				Channel0_TC++;
		}
		// Check error terminal status
		if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)){
			// Clear error counter Interrupt pending
			GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0);
			Channel0_Err++;
		}
	}
	if (GPDMA_IntGetStatus(GPDMA_STAT_INT, 1)){ //check interrupt status on channel 0
		// Check counter terminal status
		if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 1)){
			// Clear terminate counter Interrupt pending
			GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 1);
				Channel1_TC++;
		}
		// Check error terminal status
		if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR,1)){
			// Clear error counter Interrupt pending
			GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 1);
			Channel1_Err++;
		}
	}
}

/*-------------------------PRIVATE FUNCTIONS------------------------------*/
/*********************************************************************//**
 * @brief		Initialize buffer
 * @param[in]	None
 * @return 		None
 **********************************************************************/
void Buffer_Init(void) {
	uint8_t i;

	for (i = 0; i < BUFFER_SIZE; i++) {
		I2STXBuffer[i] = ((i+1)<<16) + i + 1;
		I2SRXBuffer[i] = 0;
	}
}

/*********************************************************************//**
 * @brief		Verify buffer
 * @param[in]	none
 * @return 		None
 **********************************************************************/
Bool Buffer_Verify(void) {
	uint8_t i;
	uint32_t *pTX = (uint32_t *) &I2STXBuffer[0];
	uint32_t *pRX = (uint32_t *) &I2SRXBuffer[1];

	for (i = 0; i < BUFFER_SIZE; i++) {
		if (*pTX++ != *pRX++)  {
			/* Call Error Loop */
			return FALSE;
		}
	}
	return TRUE;
}
/*********************************************************************//**
 * @brief		Print menu screen
 * @param[in]	none
 * @return 		None
 **********************************************************************/
void print_menu(void)
{
	_DBG_(menu);
}


/*-------------------------MAIN FUNCTION------------------------------*/
/*********************************************************************//**
 * @brief		c_entry: Main program body
 * @param[in]	None
 * @return 		int
 **********************************************************************/
int c_entry(void)
{
	uint32_t i;
	GPDMA_Channel_CFG_Type GPDMACfg;
	I2S_MODEConf_Type I2S_ClkConfig;
	I2S_CFG_Type I2S_ConfigStruct;
	I2S_DMAConf_Type I2S_DMAStruct;
	PINSEL_CFG_Type PinCfg;

	/* Initialize debug via UART0
	 * – 115200bps
	 * – 8 data bit
	 * – No parity
	 * – 1 stop bit
	 * – No flow control
	 */
	debug_frmwrk_init();

	//print menu screen
	print_menu();

	//Initialize buffer
	Buffer_Init();

	_DBG_("Press '1' to initialize buffer...");
	while(_DG !='1');
	_DBG_("Transmit Buffer init: ...");
	for(i=0;i<BUFFER_SIZE;i++)
	{
		_DBH32(I2STXBuffer[i]);_DBG_("");
	}
	_DBG_("Receive Buffer init: ...");
	for(i=0;i<BUFFER_SIZE;i++)
	{
		_DBH32(I2SRXBuffer[i]);_DBG_("");
	}

	/* Pin configuration:
	 * Assign: 	- P0.4 as I2SRX_CLK
	 * 			- P0.5 as I2SRX_WS
	 * 			- P0.6 as I2SRX_SDA
	 * 			- P0.7 as I2STX_CLK
	 * 			- P0.8 as I2STX_WS
	 * 			- P0.9 as I2STX_SDA
	 */
	PinCfg.Funcnum = 1;
	PinCfg.OpenDrain = 0;
	PinCfg.Pinmode = 0;
	PinCfg.Pinnum = 4;
	PinCfg.Portnum = 0;
	PINSEL_ConfigPin(&PinCfg);
	PinCfg.Pinnum = 5;
	PINSEL_ConfigPin(&PinCfg);
	PinCfg.Pinnum = 6;
	PINSEL_ConfigPin(&PinCfg);
	PinCfg.Pinnum = 7;
	PINSEL_ConfigPin(&PinCfg);
	PinCfg.Pinnum = 8;
	PINSEL_ConfigPin(&PinCfg);
	PinCfg.Pinnum = 9;
	PINSEL_ConfigPin(&PinCfg);

	/* Initialize I2S */
	I2S_Init(LPC_I2S);

	//Setup for I2S: RX is similar with TX
	/* setup:
	 * 		- wordwidth: 16 bits
	 * 		- stereo mode
	 * 		- master mode for I2S_TX and slave for I2S_RX
	 * 		- ws_halfperiod is 31
	 * 		- not use mute mode
	 * 		- use reset and stop mode
	 * 		- select the fractional rate divider clock output as the source,
	 * 		- disable 4-pin mode
	 * 		- MCLK ouput is disable
	 * 		- Frequency = 44.1 kHz
	 * Because we use mode I2STXMODE[3:0]= 0000, I2SDAO[5]=0 and
	 * I2SRX[3:0]=0000, I2SDAI[5] = 1. So we have I2SRX_CLK = I2STX_CLK
	 * --> I2SRXBITRATE = 1 (not divide TXCLK to produce RXCLK)
	 */

	/* Audio Config*/
	I2S_ConfigStruct.wordwidth = I2S_WORDWIDTH_16;
	I2S_ConfigStruct.mono = I2S_STEREO;
	I2S_ConfigStruct.stop = I2S_STOP_ENABLE;
	I2S_ConfigStruct.reset = I2S_RESET_ENABLE;
	I2S_ConfigStruct.ws_sel = I2S_MASTER_MODE;
	I2S_ConfigStruct.mute = I2S_MUTE_DISABLE;
	I2S_Config(LPC_I2S,I2S_TX_MODE,&I2S_ConfigStruct);

	I2S_ConfigStruct.ws_sel = I2S_SLAVE_MODE;
	I2S_Config(LPC_I2S,I2S_RX_MODE,&I2S_ConfigStruct);

	/* Clock Mode Config*/
	I2S_ClkConfig.clksel = I2S_CLKSEL_FRDCLK;
	I2S_ClkConfig.fpin = I2S_4PIN_DISABLE;
	I2S_ClkConfig.mcena = I2S_MCLK_DISABLE;
	I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_TX_MODE);
	I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_RX_MODE);

	/* Set up frequency and bit rate*/
	I2S_FreqConfig(LPC_I2S, 44100, I2S_TX_MODE);
	I2S_SetBitRate(LPC_I2S, 0, I2S_RX_MODE);
	_DBG_("Press '2' to initialize DMA...");
	while(_DG !='2');
	  /* GPDMA Interrupt configuration section ------------------------------------------------- */

	 /* Initialize GPDMA controller */
	 GPDMA_Init();
	 LPC_GPDMA->DMACConfig = 0x01;

	 /* Setting GPDMA interrupt */
     // Disable interrupt for DMA
     NVIC_DisableIRQ (DMA_IRQn);
     /* preemption = 1, sub-priority = 1 */
     NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01));

	/*
	 * Configure GPDMA channel 0 -------------------------------------------------------------
	 * Used for I2S Transmit
	 */
	// Setup GPDMA channel --------------------------------
	// channel 0
	GPDMACfg.ChannelNum = 0;
	// Source memory
	GPDMACfg.SrcMemAddr = DMA_SRC;
	// Destination memory
	GPDMACfg.DstMemAddr = 0;
	// Transfer size
	GPDMACfg.TransferSize = BUFFER_SIZE;
	// Transfer width - unused
	GPDMACfg.TransferWidth = 0;
	// Transfer type
	GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
	// Source connection
	GPDMACfg.SrcConn = 0;
	// Destination connection - unused
	GPDMACfg.DstConn = GPDMA_CONN_I2S_Channel_0;
	// Linker List Item - unused
	GPDMACfg.DMALLI = 0;
	GPDMA_Setup(&GPDMACfg);
	_DBG_("DMA Channel 0 setting finised...");
	/* Reset terminal counter */
	Channel0_TC = 0;
	/* Reset Error counter */
	Channel0_Err = 0;

	/*
	* Configure GPDMA channel 1 -------------------------------------------------------------
	* Used for UART0 Receive
	*/
	// Setup GPDMA channel --------------------------------
	// channel 1
	GPDMACfg.ChannelNum = 1;
	// Source memory - unused
	GPDMACfg.SrcMemAddr = 0;
	// Destination memory
	GPDMACfg.DstMemAddr = DMA_DST;
	// Transfer size
	GPDMACfg.TransferSize = BUFFER_SIZE+1;
	// Transfer width - unused
	GPDMACfg.TransferWidth = 0;
	// Transfer type
	GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_P2M;
	// Source connection - unused
	GPDMACfg.SrcConn = GPDMA_CONN_I2S_Channel_1;
	// Destination connection
	GPDMACfg.DstConn = 0;
	// Linker List Item - unused
	GPDMACfg.DMALLI = 0;
	GPDMA_Setup(&GPDMACfg);
	_DBG_("DMA Channel 1 setting finised...");
	/* Reset terminal counter */
	Channel1_TC = 0;
	/* Reset Error counter */
	Channel1_Err = 0;

	// Enable GPDMA channel 0 & 1
	GPDMA_ChannelCmd(0, ENABLE);
	GPDMA_ChannelCmd(1, ENABLE);

	// Enable interrupt for DMA
	NVIC_EnableIRQ (DMA_IRQn);
	_DBG_("Press '3' to start I2S transfer process...");
	while(_DG !='3');
	_DBG_("I2S Start...");

	I2S_DMAStruct.DMAIndex = I2S_DMA_2;
	I2S_DMAStruct.depth = 8;
	I2S_DMAConfig(LPC_I2S, &I2S_DMAStruct, I2S_RX_MODE);
	I2S_DMAStruct.DMAIndex = I2S_DMA_1;
	I2S_DMAStruct.depth = 1;
	I2S_DMAConfig(LPC_I2S, &I2S_DMAStruct, I2S_TX_MODE);

	I2S_Start(LPC_I2S);

	I2S_DMACmd(LPC_I2S, I2S_DMA_2, I2S_RX_MODE, ENABLE);
	I2S_DMACmd(LPC_I2S, I2S_DMA_1, I2S_TX_MODE, ENABLE);

	while ((Channel0_TC == 0)||(Channel1_TC == 0) );

	_DBG_("I2S Finish...");
	_DBG_("Receive Buffer data: ...");
	for(i=0;i<BUFFER_SIZE+1;i++)
	{
	 _DBH32(I2SRXBuffer[i]);
	 if(I2SRXBuffer[i]==0)
	 {
		 _DBG_(" ->Dummy data");
	 }
	 else _DBG_("");
	}
	I2S_DeInit(LPC_I2S);
	while(1);
	return 1;
}

/* With ARM and GHS toolsets, the entry point is main() - this will
   allow the linker to generate wrapper code to setup stacks, allocate
   heap area, and initialize and copy code and data segments. For GNU
   toolsets, the entry point is through __start() in the crt0_gnu.asm
   file, and that startup code will setup stacks and data */
int main(void)
{
    return c_entry();
}

#ifdef  DEBUG
/*******************************************************************************
* @brief		Reports the name of the source file and the source line number
* 				where the CHECK_PARAM error has occurred.
* @param[in]	file Pointer to the source file name
* @param[in]    line assert_param error line source number
* @return		None
*******************************************************************************/
void check_failed(uint8_t *file, uint32_t line)
{
	/* User can add his own implementation to report the file name and line number,
	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

	/* Infinite loop */
	while(1);
}
#endif

/*
 * @}
 */