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Firmware2/frameworks/CMSIS/LPC1768/driver/lpc17xx_i2s.c

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/**********************************************************************
* $Id$ lpc17xx_i2s.c 2010-09-23
*//**
* @file lpc17xx_i2s.c
* @brief Contains all functions support for I2S firmware
* library on LPC17xx
* @version 3.1
* @date 23. Sep. 2010
* @author NXP MCU SW Application Team
*
* Copyright(C) 2010, 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.
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors'
* relevant copyright in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
**********************************************************************/
/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup I2S
* @{
*/
/* Includes ------------------------------------------------------------------- */
#include "lpc17xx_i2s.h"
#include "lpc17xx_clkpwr.h"
/* If this source file built with example, the LPC17xx FW library configuration
* file in each example directory ("lpc17xx_libcfg.h") must be included,
* otherwise the default FW library configuration file must be included instead
*/
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc17xx_libcfg.h"
#else
#include "lpc17xx_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _I2S
/* 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;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
value = (I2Sx->I2SDAO) & 0x03; /* get wordwidth bit */
} else {
value = (I2Sx->I2SDAI) & 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;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
value = ((I2Sx->I2SDAO) & 0x04)>>2; /* get bit[2] */
} else {
value = ((I2Sx->I2SDAI) & 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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
// Turn on power and clock
CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, ENABLE);
LPC_I2S->I2SDAI = LPC_I2S->I2SDAO = 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;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_WORDWIDTH(ConfigStruct->wordwidth));
CHECK_PARAM(PARAM_I2S_CHANNEL(ConfigStruct->mono));
CHECK_PARAM(PARAM_I2S_STOP(ConfigStruct->stop));
CHECK_PARAM(PARAM_I2S_RESET(ConfigStruct->reset));
CHECK_PARAM(PARAM_I2S_WS_SEL(ConfigStruct->ws_sel));
CHECK_PARAM(PARAM_I2S_MUTE(ConfigStruct->mute));
/* 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->I2SDAI = config;
}else{
LPC_I2S->I2SDAO = 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) {
CHECK_PARAM(PARAM_I2Sx(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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if(TRMode == I2S_TX_MODE)
{
return ((I2Sx->I2SSTATE >> 16) & 0xFF);
}
else
{
return ((I2Sx->I2SSTATE >> 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->I2SDAO &= ~I2S_DAI_RESET;
I2Sx->I2SDAI &= ~I2S_DAI_RESET;
I2Sx->I2SDAO &= ~I2S_DAI_STOP;
I2Sx->I2SDAI &= ~I2S_DAI_STOP;
I2Sx->I2SDAO &= ~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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
I2Sx->I2STXFIFO = BufferData;
}
/********************************************************************//**
* @brief I2S Receive Data
* @param[in] I2Sx pointer to LPC_I2S_TypeDef
* @return received value
*********************************************************************/
uint32_t I2S_Receive(LPC_I2S_TypeDef* I2Sx) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
return (I2Sx->I2SRXFIFO);
}
/********************************************************************//**
* @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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) //Transmit mode
{
I2Sx->I2SDAO |= I2S_DAO_STOP;
} else //Receive mode
{
I2Sx->I2SDAI |= 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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) //Transmit mode
{
I2Sx->I2SDAO |= I2S_DAO_MUTE;
} else //Receive mode
{
I2Sx->I2SDAI |= 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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) //Transmit mode
{
I2Sx->I2SDAO &= ~I2S_DAO_MUTE;
I2Sx->I2SDAO |= I2S_DAO_STOP;
I2Sx->I2SDAO |= I2S_DAO_RESET;
} else //Receive mode
{
I2Sx->I2SDAI |= I2S_DAI_STOP;
I2Sx->I2SDAI |= I2S_DAI_RESET;
}
}
/********************************************************************//**
* @brief Set frequency for I2S
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
* @param[in] Freq is the frequency for I2S will be set. It can range
* from 16-96 kHz(16, 22.05, 32, 44.1, 48, 96kHz)
* @param[in] TRMode is transmit/receive mode, should be:
* - I2S_TX_MODE = 0: transmit mode
* - I2S_RX_MODE = 1: receive mode
* @return Status: ERROR or SUCCESS
*********************************************************************/
Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) {
uint32_t i2s_clk;
uint8_t channel, wordwidth;
uint32_t x, y;
uint64_t divider;
uint16_t dif;
uint16_t x_divide, y_divide;
uint16_t err, ErrorOptimal = 0xFFFF;
uint32_t N;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PRAM_I2S_FREQ(Freq));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
//Get the frequency of PCLK_I2S
i2s_clk = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_I2S);
if(TRMode == I2S_TX_MODE)
{
channel = i2s_GetChannel(I2Sx,I2S_TX_MODE);
wordwidth = i2s_GetWordWidth(I2Sx,I2S_TX_MODE);
}
else
{
channel = i2s_GetChannel(I2Sx,I2S_RX_MODE);
wordwidth = i2s_GetWordWidth(I2Sx,I2S_RX_MODE);
}
/* Calculate X and Y divider
* The MCLK rate for the I2S transmitter is determined by the value
* in the I2STXRATE/I2SRXRATE register. The required I2STXRATE/I2SRXRATE
* setting depends on the desired audio sample rate desired, the format
* (stereo/mono) used, and the data size.
* The formula is:
* I2S_MCLK = PCLK_I2S * (X/Y) / 2
* In that, Y must be greater than or equal to X. X should divides evenly
* into Y.
* We have:
* I2S_MCLK = Freq * channel*wordwidth * (I2STXBITRATE+1);
* So: (X/Y) = (Freq * channel*wordwidth * (I2STXBITRATE+1))*2/PCLK_I2S
* We use a loop function to chose the most suitable X,Y value
*/
/* divider is a fixed point number with 16 fractional bits */
divider = (((uint64_t)Freq *channel*wordwidth * 2)<<16) / i2s_clk;
/* find N that make x/y <= 1 -> divider <= 2^16 */
for(N=64;N>0;N--){
if((divider*N) < (1<<16)) break;
}
if(N == 0) return ERROR;
divider *= N;
for (y = 255; y > 0; y--) {
x = y * divider;
if(x & (0xFF000000)) continue;
dif = x & 0xFFFF;
if(dif>0x8000) err = 0x10000-dif;
else err = dif;
if (err == 0)
{
y_divide = y;
break;
}
else if (err < ErrorOptimal)
{
ErrorOptimal = err;
y_divide = y;
}
}
x_divide = ((uint64_t)y_divide * Freq *(channel*wordwidth)* N * 2)/i2s_clk;
if(x_divide >= 256) x_divide = 0xFF;
if(x_divide == 0) x_divide = 1;
if (TRMode == I2S_TX_MODE)// Transmitter
{
I2Sx->I2STXBITRATE = N-1;
I2Sx->I2STXRATE = y_divide | (x_divide << 8);
} else //Receiver
{
I2Sx->I2SRXBITRATE = N-1;
I2Sx->I2STXRATE = 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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_BITRATE(bitrate));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if(TRMode == I2S_TX_MODE)
{
I2Sx->I2STXBITRATE = bitrate;
}
else
{
I2Sx->I2SRXBITRATE = 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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_CLKSEL(ModeConfig->clksel));
CHECK_PARAM(PARAM_I2S_4PIN(ModeConfig->fpin));
CHECK_PARAM(PARAM_I2S_MCLK(ModeConfig->mcena));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
I2Sx->I2STXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
I2Sx->I2STXMODE |= 0x02;
}
if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
I2Sx->I2STXMODE |= (1 << 2);
}
if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
I2Sx->I2STXMODE |= (1 << 3);
}
} else {
I2Sx->I2SRXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
I2Sx->I2SRXMODE |= 0x02;
}
if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
I2Sx->I2SRXMODE |= (1 << 2);
}
if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
I2Sx->I2SRXMODE |= (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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_DMA(DMAConfig->DMAIndex));
CHECK_PARAM(PARAM_I2S_DMA_DEPTH(DMAConfig->depth));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_RX_MODE) {
if (DMAConfig->DMAIndex == I2S_DMA_1) {
LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 8;
} else {
LPC_I2S->I2SDMA2 = (DMAConfig->depth) << 8;
}
} else {
if (DMAConfig->DMAIndex == I2S_DMA_1) {
LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 16;
} else {
LPC_I2S->I2SDMA2 = (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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
CHECK_PARAM(PARAM_I2S_DMA(DMAIndex));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_RX_MODE) {
if (DMAIndex == I2S_DMA_1) {
if (NewState == ENABLE)
I2Sx->I2SDMA1 |= 0x01;
else
I2Sx->I2SDMA1 &= ~0x01;
} else {
if (NewState == ENABLE)
I2Sx->I2SDMA2 |= 0x01;
else
I2Sx->I2SDMA2 &= ~0x01;
}
} else {
if (DMAIndex == I2S_DMA_1) {
if (NewState == ENABLE)
I2Sx->I2SDMA1 |= 0x02;
else
I2Sx->I2SDMA1 &= ~0x02;
} else {
if (NewState == ENABLE)
I2Sx->I2SDMA2 |= 0x02;
else
I2Sx->I2SDMA2 &= ~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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
CHECK_PARAM(PARAM_I2S_IRQ_LEVEL(level));
if (TRMode == I2S_RX_MODE) {
I2Sx->I2SIRQ |= (level << 8);
} else {
I2Sx->I2SIRQ |= (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) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
if (TRMode == I2S_RX_MODE) {
if (NewState == ENABLE)
I2Sx->I2SIRQ |= 0x01;
else
I2Sx->I2SIRQ &= ~0x01;
//Enable DMA
} else {
if (NewState == ENABLE)
I2Sx->I2SIRQ |= 0x02;
else
I2Sx->I2SIRQ &= ~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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
if(TRMode == I2S_TX_MODE)
return ((FunctionalState)((I2Sx->I2SIRQ >> 1)&0x01));
else
return ((FunctionalState)((I2Sx->I2SIRQ)&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)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
if(TRMode == I2S_TX_MODE)
return (((I2Sx->I2SIRQ)>>16)&0xFF);
else
return (((I2Sx->I2SIRQ)>>8)&0xFF);
}
/**
* @}
*/
#endif /* _I2S */
/**
* @}
*/
/* --------------------------------- End Of File ------------------------------ */
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