590 lines
20 KiB
C
590 lines
20 KiB
C
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/**********************************************************************
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* $Id$ lpc_i2s.c 2011-06-02
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*//**
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* @file lpc_i2s.c
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* @brief Contains all functions support for I2S firmware library
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* on LPC
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup I2S
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* @{
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc_libcfg.h"
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#else
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#include "lpc_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _I2S
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/* Includes ------------------------------------------------------------------- */
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#include "lpc_i2s.h"
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#include "lpc_clkpwr.h"
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/* definitions ---------------------------------------------------------- */
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#define I2S_IS_ENABLED(x) ((x)? ENABLE:DISABLE)
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/* Private Functions ---------------------------------------------------------- */
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static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);
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static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);
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/********************************************************************//**
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* @brief Get I2S wordwidth value
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode is the I2S mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return The wordwidth value, should be: 8,16 or 32
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*********************************************************************/
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static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
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uint8_t value;
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if (TRMode == I2S_TX_MODE) {
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value = (I2Sx->DAO) & 0x03; /* get wordwidth bit */
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} else {
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value = (I2Sx->DAI) & 0x03; /* get wordwidth bit */
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}
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switch (value) {
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case I2S_WORDWIDTH_8:
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return 8;
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case I2S_WORDWIDTH_16:
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return 16;
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default:
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return 32;
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}
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}
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/********************************************************************//**
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* @brief Get I2S channel value
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode is the I2S mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return The channel value, should be: 1(mono) or 2(stereo)
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*********************************************************************/
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static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
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uint8_t value;
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if (TRMode == I2S_TX_MODE) {
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value = ((I2Sx->DAO) & 0x04)>>2; /* get bit[2] */
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} else {
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value = ((I2Sx->DAI) & 0x04)>>2; /* get bit[2] */
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}
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if(value == I2S_MONO) return 1;
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return 2;
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}
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/* End of Private Functions --------------------------------------------------- */
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup I2S_Public_Functions
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* @{
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*/
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/********************************************************************//**
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* @brief Initialize I2S
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* - Turn on power and clock
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @return none
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*********************************************************************/
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void I2S_Init(LPC_I2S_TypeDef *I2Sx) {
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// Turn on power and clock
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CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, ENABLE);
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LPC_I2S->DAI = LPC_I2S->DAO = 0x00;
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}
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/********************************************************************//**
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* @brief Configuration I2S, setting:
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* - master/slave mode
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* - wordwidth value
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* - channel mode
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @param[in] ConfigStruct pointer to I2S_CFG_Type structure
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* which will be initialized.
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* @return none
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*********************************************************************/
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void I2S_Config(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, I2S_CFG_Type* ConfigStruct)
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{
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uint32_t bps, config;
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/* Setup clock */
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bps = (ConfigStruct->wordwidth +1)*8;
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/* Calculate audio config */
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config = (bps - 1)<<6 | (ConfigStruct->ws_sel)<<5 | (ConfigStruct->reset)<<4 |
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(ConfigStruct->stop)<<3 | (ConfigStruct->mono)<<2 | (ConfigStruct->wordwidth);
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if(TRMode == I2S_RX_MODE){
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LPC_I2S->DAI = config;
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}else{
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LPC_I2S->DAO = config;
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}
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}
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/********************************************************************//**
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* @brief DeInitial both I2S transmit or receive
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @return none
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*********************************************************************/
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void I2S_DeInit(LPC_I2S_TypeDef *I2Sx) {
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// Turn off power and clock
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CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, DISABLE);
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}
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/********************************************************************//**
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* @brief Get I2S Buffer Level
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode Transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return current level of Transmit/Receive Buffer
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*********************************************************************/
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uint8_t I2S_GetLevel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode)
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{
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if(TRMode == I2S_TX_MODE)
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{
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return ((I2Sx->STATE >> 16) & 0xFF);
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}
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else
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{
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return ((I2Sx->STATE >> 8) & 0xFF);
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}
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}
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/********************************************************************//**
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* @brief I2S Start: clear all STOP,RESET and MUTE bit, ready to operate
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @return none
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*********************************************************************/
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void I2S_Start(LPC_I2S_TypeDef *I2Sx)
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{
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//Clear STOP,RESET and MUTE bit
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I2Sx->DAO &= ~I2S_DAI_RESET;
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I2Sx->DAI &= ~I2S_DAI_RESET;
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I2Sx->DAO &= ~I2S_DAI_STOP;
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I2Sx->DAI &= ~I2S_DAI_STOP;
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I2Sx->DAO &= ~I2S_DAI_MUTE;
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}
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/********************************************************************//**
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* @brief I2S Send data
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] BufferData pointer to uint32_t is the data will be send
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* @return none
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*********************************************************************/
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void I2S_Send(LPC_I2S_TypeDef *I2Sx, uint32_t BufferData)
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{
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I2Sx->TXFIFO = BufferData;
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}
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/********************************************************************//**
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* @brief I2S Receive Data
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* @param[in] I2Sx pointer to LPC_I2S_TypeDef
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* @return received value
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*********************************************************************/
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uint32_t I2S_Receive(LPC_I2S_TypeDef* I2Sx)
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{
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return (I2Sx->RXFIFO);
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}
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/********************************************************************//**
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* @brief I2S Pause
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode is transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return none
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*********************************************************************/
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void I2S_Pause(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
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if (TRMode == I2S_TX_MODE) //Transmit mode
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{
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I2Sx->DAO |= I2S_DAO_STOP;
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} else //Receive mode
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{
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I2Sx->DAI |= I2S_DAI_STOP;
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}
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}
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/********************************************************************//**
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* @brief I2S Mute
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode is transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return none
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*********************************************************************/
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void I2S_Mute(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
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if (TRMode == I2S_TX_MODE) //Transmit mode
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{
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I2Sx->DAO |= I2S_DAO_MUTE;
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} else //Receive mode
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{
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I2Sx->DAI |= I2S_DAI_MUTE;
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}
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}
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/********************************************************************//**
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* @brief I2S Stop
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] TRMode is transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return none
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*********************************************************************/
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void I2S_Stop(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
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if (TRMode == I2S_TX_MODE) //Transmit mode
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{
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I2Sx->DAO &= ~I2S_DAO_MUTE;
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I2Sx->DAO |= I2S_DAO_STOP;
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I2Sx->DAO |= I2S_DAO_RESET;
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} else //Receive mode
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{
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I2Sx->DAI |= I2S_DAI_STOP;
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I2Sx->DAI |= I2S_DAI_RESET;
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}
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}
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/********************************************************************//**
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* @brief Set frequency for I2S
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* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
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* @param[in] Freq is the frequency for I2S will be set. It can range
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* from 16-96 kHz(16, 22.05, 32, 44.1, 48, 96kHz)
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* @param[in] TRMode is transmit/receive mode, should be:
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* - I2S_TX_MODE = 0: transmit mode
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* - I2S_RX_MODE = 1: receive mode
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* @return Status: ERROR or SUCCESS
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*********************************************************************/
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Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) {
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uint32_t cclk;
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uint8_t channel, wordwidth;
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uint32_t x, y;
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uint64_t divider;
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uint16_t dif;
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uint16_t x_divide, y_divide;
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uint16_t err, ErrorOptimal = 0xFFFF;
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uint32_t N;
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//get cclk
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cclk = CLKPWR_GetCLK(CLKPWR_CLKTYPE_CPU);
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if(TRMode == I2S_TX_MODE)
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{
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channel = i2s_GetChannel(I2Sx,I2S_TX_MODE);
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wordwidth = i2s_GetWordWidth(I2Sx,I2S_TX_MODE);
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}
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else
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{
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channel = i2s_GetChannel(I2Sx,I2S_RX_MODE);
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wordwidth = i2s_GetWordWidth(I2Sx,I2S_RX_MODE);
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}
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/* Calculate X and Y divider
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* The MCLK rate for the I2S transmitter is determined by the value
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* in the I2STXRATE/I2SRXRATE register. The required I2STXRATE/I2SRXRATE
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* setting depends on the desired audio sample rate desired, the format
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* (stereo/mono) used, and the data size.
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* The formula is:
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* I2S_MCLK = CCLK * (X/Y) / 2
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* We have:
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* I2S_MCLK = Freq * channel*wordwidth * (I2Sx->TXBITRATE+1);
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* So: (X/Y) = (Freq * channel*wordwidth * (I2Sx->TXBITRATE+1))/CCLK*2
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* We use a loop function to chose the most suitable X,Y value
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*/
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/* divider is a fixed point number with 16 fractional bits */
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divider = (((uint64_t)Freq *channel*wordwidth * 2)<<16) / cclk;
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/* find N that make x/y <= 1 -> divider <= 2^16 */
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for(N=64;N>0;N--){
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if((divider*N) < (1<<16)) break;
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}
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if(N == 0) return ERROR;
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divider *= N;
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for (y = 255; y > 0; y--) {
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x = y * divider;
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if(x & (0xFF000000)) continue;
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dif = x & 0xFFFF;
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if(dif>0x8000) err = 0x10000-dif;
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else err = dif;
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if (err == 0)
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{
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y_divide = y;
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|
|
break;
|
||
|
|
}
|
||
|
|
else if (err < ErrorOptimal)
|
||
|
|
{
|
||
|
|
ErrorOptimal = err;
|
||
|
|
y_divide = y;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
x_divide = ((uint64_t)y_divide * Freq *(channel*wordwidth)* N * 2)/cclk;
|
||
|
|
if(x_divide >= 256) x_divide = 0xFF;
|
||
|
|
if(x_divide == 0) x_divide = 1;
|
||
|
|
|
||
|
|
if (TRMode == I2S_TX_MODE)// Transmitter
|
||
|
|
{
|
||
|
|
I2Sx->TXBITRATE = N-1;
|
||
|
|
I2Sx->TXRATE = y_divide | (x_divide << 8);
|
||
|
|
} else //Receiver
|
||
|
|
{
|
||
|
|
I2Sx->RXBITRATE = N-1;
|
||
|
|
I2Sx->TXRATE = y_divide | (x_divide << 8);
|
||
|
|
}
|
||
|
|
return SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief I2S set bitrate
|
||
|
|
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
|
||
|
|
* @param[in] bitrate value will be set
|
||
|
|
* bitrate value should be in range: 0 .. 63
|
||
|
|
* @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_SetBitRate(LPC_I2S_TypeDef *I2Sx, uint8_t bitrate, uint8_t TRMode)
|
||
|
|
{
|
||
|
|
if(TRMode == I2S_TX_MODE)
|
||
|
|
{
|
||
|
|
I2Sx->TXBITRATE = bitrate;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
I2Sx->RXBITRATE = bitrate;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Configuration operating mode for I2S
|
||
|
|
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
|
||
|
|
* @param[in] ModeConfig pointer to I2S_MODEConf_Type will be used to
|
||
|
|
* configure
|
||
|
|
* @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_ModeConfig(LPC_I2S_TypeDef *I2Sx, I2S_MODEConf_Type* ModeConfig,
|
||
|
|
uint8_t TRMode)
|
||
|
|
{
|
||
|
|
if (TRMode == I2S_TX_MODE) {
|
||
|
|
I2Sx->TXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
|
||
|
|
if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
|
||
|
|
I2Sx->TXMODE |= 0x02;
|
||
|
|
}
|
||
|
|
if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
|
||
|
|
I2Sx->TXMODE |= (1 << 2);
|
||
|
|
}
|
||
|
|
if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
|
||
|
|
I2Sx->TXMODE |= (1 << 3);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
I2Sx->RXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
|
||
|
|
if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
|
||
|
|
I2Sx->RXMODE |= 0x02;
|
||
|
|
}
|
||
|
|
if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
|
||
|
|
I2Sx->RXMODE |= (1 << 2);
|
||
|
|
}
|
||
|
|
if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
|
||
|
|
I2Sx->RXMODE |= (1 << 3);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Configure DMA operation for I2S
|
||
|
|
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
|
||
|
|
* @param[in] DMAConfig pointer to I2S_DMAConf_Type will be used to configure
|
||
|
|
* @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_DMAConfig(LPC_I2S_TypeDef *I2Sx, I2S_DMAConf_Type* DMAConfig,
|
||
|
|
uint8_t TRMode)
|
||
|
|
{
|
||
|
|
if (TRMode == I2S_RX_MODE) {
|
||
|
|
if (DMAConfig->DMAIndex == I2S_DMA_1) {
|
||
|
|
LPC_I2S->DMA1 = (DMAConfig->depth) << 8;
|
||
|
|
} else {
|
||
|
|
LPC_I2S->DMA2 = (DMAConfig->depth) << 8;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (DMAConfig->DMAIndex == I2S_DMA_1) {
|
||
|
|
LPC_I2S->DMA1 = (DMAConfig->depth) << 16;
|
||
|
|
} else {
|
||
|
|
LPC_I2S->DMA2 = (DMAConfig->depth) << 16;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Enable/Disable DMA operation for I2S
|
||
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: LPC_I2S
|
||
|
|
* @param[in] DMAIndex chose what DMA is used, should be:
|
||
|
|
* - I2S_DMA_1 = 0: DMA1
|
||
|
|
* - I2S_DMA_2 = 1: DMA2
|
||
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
||
|
|
* - I2S_TX_MODE = 0: transmit mode
|
||
|
|
* - I2S_RX_MODE = 1: receive mode
|
||
|
|
* @param[in] NewState is new state of DMA operation, should be:
|
||
|
|
* - ENABLE
|
||
|
|
* - DISABLE
|
||
|
|
* @return none
|
||
|
|
*********************************************************************/
|
||
|
|
void I2S_DMACmd(LPC_I2S_TypeDef *I2Sx, uint8_t DMAIndex, uint8_t TRMode,
|
||
|
|
FunctionalState NewState)
|
||
|
|
{
|
||
|
|
if (TRMode == I2S_RX_MODE) {
|
||
|
|
if (DMAIndex == I2S_DMA_1) {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->DMA1 |= 0x01;
|
||
|
|
else
|
||
|
|
I2Sx->DMA1 &= ~0x01;
|
||
|
|
} else {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->DMA2 |= 0x01;
|
||
|
|
else
|
||
|
|
I2Sx->DMA2 &= ~0x01;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (DMAIndex == I2S_DMA_1) {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->DMA1 |= 0x02;
|
||
|
|
else
|
||
|
|
I2Sx->DMA1 &= ~0x02;
|
||
|
|
} else {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->DMA2 |= 0x02;
|
||
|
|
else
|
||
|
|
I2Sx->DMA2 &= ~0x02;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Configure IRQ for I2S
|
||
|
|
* @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
|
||
|
|
* @param[in] level is the FIFO level that triggers IRQ request
|
||
|
|
* @return none
|
||
|
|
*********************************************************************/
|
||
|
|
void I2S_IRQConfig(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, uint8_t level) {
|
||
|
|
if (TRMode == I2S_RX_MODE) {
|
||
|
|
I2Sx->IRQ |= (level << 8);
|
||
|
|
} else {
|
||
|
|
I2Sx->IRQ |= (level << 16);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Enable/Disable IRQ for I2S
|
||
|
|
* @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
|
||
|
|
* @param[in] NewState is new state of DMA operation, should be:
|
||
|
|
* - ENABLE
|
||
|
|
* - DISABLE
|
||
|
|
* @return none
|
||
|
|
*********************************************************************/
|
||
|
|
void I2S_IRQCmd(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, FunctionalState NewState) {
|
||
|
|
|
||
|
|
if (TRMode == I2S_RX_MODE) {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->IRQ |= 0x01;
|
||
|
|
else
|
||
|
|
I2Sx->IRQ &= ~0x01;
|
||
|
|
//Enable DMA
|
||
|
|
|
||
|
|
} else {
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
I2Sx->IRQ |= 0x02;
|
||
|
|
else
|
||
|
|
I2Sx->IRQ &= ~0x02;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Get I2S interrupt status
|
||
|
|
* @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 FunctionState should be:
|
||
|
|
* - ENABLE: interrupt is enable
|
||
|
|
* - DISABLE: interrupt is disable
|
||
|
|
*********************************************************************/
|
||
|
|
FunctionalState I2S_GetIRQStatus(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
|
||
|
|
{
|
||
|
|
|
||
|
|
if(TRMode == I2S_TX_MODE)
|
||
|
|
return I2S_IS_ENABLED((I2Sx->IRQ >> 1)&0x01);
|
||
|
|
else
|
||
|
|
return I2S_IS_ENABLED((I2Sx->IRQ)&0x01);
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Get I2S interrupt depth
|
||
|
|
* @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 depth of FIFO level on which to create an irq request
|
||
|
|
*********************************************************************/
|
||
|
|
uint8_t I2S_GetIRQDepth(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
|
||
|
|
{
|
||
|
|
|
||
|
|
if(TRMode == I2S_TX_MODE)
|
||
|
|
return (((I2Sx->IRQ)>>16)&0xFF);
|
||
|
|
else
|
||
|
|
return (((I2Sx->IRQ)>>8)&0xFF);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
#endif /*_I2S*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* --------------------------------- End Of File ------------------------------ */
|
||
|
|
|