lpc177x_8x_i2s.c

LPC1788的USBHOST的FATFS移植

/**********************************************************************
* $Id$		lpc177x_8x_i2s.c			2011-06-02
*//**
* @file		lpc177x_8x_i2s.c
* @brief	Contains all functions support for I2S firmware library
*			on LPC177x_8x
* @version	1.0
* @date		02. June. 2011
* @author	NXP MCU SW Application Team
* 
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* 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.
**********************************************************************/

/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup I2S
 * @{
 */

/* Includes ------------------------------------------------------------------- */
#include "lpc177x_8x_i2s.h"
#include "lpc177x_8x_clkpwr.h"

/* Private Functions ---------------------------------------------------------- */

static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);
static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);

/********************************************************************//**
 * @brief		Get I2S wordwidth value
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is the I2S mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		The wordwidth value, should be: 8,16 or 32
 *********************************************************************/
static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
	uint8_t value;

	if (TRMode == I2S_TX_MODE) {
		value = (I2Sx->DAO) & 0x03; /* get wordwidth bit */
	} else {
		value = (I2Sx->DAI) & 0x03; /* get wordwidth bit */
	}
	switch (value) {
	case I2S_WORDWIDTH_8:
		return 8;
	case I2S_WORDWIDTH_16:
		return 16;
	default:
		return 32;
	}
}

/********************************************************************//**
 * @brief		Get I2S channel value
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is the I2S mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		The channel value, should be: 1(mono) or 2(stereo)
 *********************************************************************/
static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
	uint8_t value;

	if (TRMode == I2S_TX_MODE) {
		value = ((I2Sx->DAO) & 0x04)>>2; /* get bit[2] */
	} else {
		value = ((I2Sx->DAI) & 0x04)>>2; /* get bit[2] */
	}
        if(value == I2S_MONO) return 1;
          return 2;
}

/* End of Private Functions --------------------------------------------------- */


/* Public Functions ----------------------------------------------------------- */
/** @addtogroup I2S_Public_Functions
 * @{
 */

/********************************************************************//**
 * @brief		Initialize I2S
 * 					- Turn on power and clock
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @return 		none
 *********************************************************************/
void I2S_Init(LPC_I2S_TypeDef *I2Sx) {
	// Turn on power and clock
	CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, ENABLE);
	LPC_I2S->DAI = LPC_I2S->DAO = 0x00;
}

/********************************************************************//**
 * @brief		Configuration I2S, setting:
 * 					- master/slave mode
 * 					- wordwidth value
 * 					- channel mode
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode transmit/receive mode, should be:
 * 					- I2S_TX_MODE = 0: transmit mode
 * 					- I2S_RX_MODE = 1: receive mode
 * @param[in]	ConfigStruct pointer to I2S_CFG_Type structure
 *              which will be initialized.
 * @return 		none
 *********************************************************************/
void I2S_Config(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, I2S_CFG_Type* ConfigStruct)
{
	uint32_t bps, config;
	/* Setup clock */
	bps = (ConfigStruct->wordwidth +1)*8;

	/* Calculate audio config */
	config = (bps - 1)<<6 | (ConfigStruct->ws_sel)<<5 | (ConfigStruct->reset)<<4 |
		(ConfigStruct->stop)<<3 | (ConfigStruct->mono)<<2 | (ConfigStruct->wordwidth);

	if(TRMode == I2S_RX_MODE){
		LPC_I2S->DAI = config;
	}else{
		LPC_I2S->DAO = config;
	}
}

/********************************************************************//**
 * @brief		DeInitial both I2S transmit or receive
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @return 		none
 *********************************************************************/
void I2S_DeInit(LPC_I2S_TypeDef *I2Sx) {
	// Turn off power and clock
	CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, DISABLE);
}

/********************************************************************//**
 * @brief		Get I2S Buffer Level
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode Transmit/receive mode, should be:
 * 					- I2S_TX_MODE = 0: transmit mode
 * 					- I2S_RX_MODE = 1: receive mode
 * @return 		current level of Transmit/Receive Buffer
 *********************************************************************/
uint8_t I2S_GetLevel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode)
{

	if(TRMode == I2S_TX_MODE)
	{
		return ((I2Sx->STATE >> 16) & 0xFF);
	}
	else
	{
		return ((I2Sx->STATE >> 8) & 0xFF);
	}
}

/********************************************************************//**
 * @brief		I2S Start: clear all STOP,RESET and MUTE bit, ready to operate
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @return 		none
 *********************************************************************/
void I2S_Start(LPC_I2S_TypeDef *I2Sx)
{
	//Clear STOP,RESET and MUTE bit
	I2Sx->DAO &= ~I2S_DAI_RESET;
	I2Sx->DAI &= ~I2S_DAI_RESET;
	I2Sx->DAO &= ~I2S_DAI_STOP;
	I2Sx->DAI &= ~I2S_DAI_STOP;
	I2Sx->DAO &= ~I2S_DAI_MUTE;
}

/********************************************************************//**
 * @brief		I2S Send data
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	BufferData pointer to uint32_t is the data will be send
 * @return 		none
 *********************************************************************/
void I2S_Send(LPC_I2S_TypeDef *I2Sx, uint32_t BufferData)
{
	I2Sx->TXFIFO = BufferData;
}

/********************************************************************//**
 * @brief		I2S Receive Data
 * @param[in]	I2Sx pointer to LPC_I2S_TypeDef
 * @return 		received value
 *********************************************************************/
uint32_t I2S_Receive(LPC_I2S_TypeDef* I2Sx)
{
	return (I2Sx->RXFIFO);
}

/********************************************************************//**
 * @brief		I2S Pause
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_Pause(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
	if (TRMode == I2S_TX_MODE) //Transmit mode
	{
		I2Sx->DAO |= I2S_DAO_STOP;
	} else //Receive mode
	{
		I2Sx->DAI |= I2S_DAI_STOP;
	}
}

/********************************************************************//**
 * @brief		I2S Mute
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_Mute(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
	if (TRMode == I2S_TX_MODE) //Transmit mode
	{
		I2Sx->DAO |= I2S_DAO_MUTE;
	} else //Receive mode
	{
		I2Sx->DAI |= I2S_DAI_MUTE;
	}
}

/********************************************************************//**
 * @brief		I2S Stop
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_Stop(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
	if (TRMode == I2S_TX_MODE) //Transmit mode
	{
		I2Sx->DAO &= ~I2S_DAO_MUTE;
		I2Sx->DAO |= I2S_DAO_STOP;
		I2Sx->DAO |= I2S_DAO_RESET;
	} else //Receive mode
	{
		I2Sx->DAI |= I2S_DAI_STOP;
		I2Sx->DAI |= I2S_DAI_RESET;
	}
}

/********************************************************************//**