|
|
/**
|
|
|
* @file : lpc17xx_i2s.c
|
|
|
* @brief : Contains all functions support for I2S firmware library on LPC17xx
|
|
|
* @version : 1.0
|
|
|
* @date : 13. May. 2009
|
|
|
* @author : NguyenCao
|
|
|
**************************************************************************
|
|
|
* 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 "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 Variables ---------------------------------------------------------- */
|
|
|
static fnI2SCbs_Type *_apfnI2SCbs[2] = {
|
|
|
NULL, // I2S transmit Call-back function pointer
|
|
|
NULL, // I2S receive Call-back function pointer
|
|
|
};
|
|
|
|
|
|
|
|
|
/* Private Functions ---------------------------------------------------------- */
|
|
|
/** @defgroup I2S_Private_Functions
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/********************************************************************//**
|
|
|
* @brief Get I2S wordwidth value
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: I2S
|
|
|
* @param[in] TRMode is the I2S mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: receive mode
|
|
|
* @return The wordwidth value, should be: 8,16 or 32
|
|
|
*********************************************************************/
|
|
|
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;
|
|
|
break;
|
|
|
case I2S_WORDWIDTH_16:
|
|
|
return 16;
|
|
|
break;
|
|
|
default:
|
|
|
return 32;
|
|
|
}
|
|
|
}
|
|
|
/********************************************************************//**
|
|
|
* @brief Get I2S channel value
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: I2S
|
|
|
* @param[in] TRMode is the I2S mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: receive mode
|
|
|
* @return The channel value, should be: 1(mono) or 2(stereo)
|
|
|
*********************************************************************/
|
|
|
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; /* get bit[2] */
|
|
|
} else {
|
|
|
value = (I2Sx->I2SDAI) & 0x04; /* get bit[2] */
|
|
|
}
|
|
|
switch (value) {
|
|
|
case I2S_MONO:
|
|
|
return 1;
|
|
|
break;
|
|
|
default:
|
|
|
return 2;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
|
|
|
/* Public Functions ----------------------------------------------------------- */
|
|
|
/** @addtogroup I2S_Public_Functions
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/********************************************************************//**
|
|
|
* @brief Initialize I2S
|
|
|
* - Turn on power and clock
|
|
|
* - Setup I2S pin select
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: 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: I2S
|
|
|
* @param[in] TRMode: transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: 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: I2S
|
|
|
* @param[in] TRMode: Transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: 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: 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));
|
|
|
CHECK_PARAM(PARAM_I2S_DATA(BufferData));
|
|
|
|
|
|
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: I2S
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: I2S
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: I2S
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: 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: transmit mode
|
|
|
* - I2S_RX_MODE: receive mode
|
|
|
* @return Status: ERROR or SUCCESS
|
|
|
*********************************************************************/
|
|
|
Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) {
|
|
|
|
|
|
/* Calculate bit rate
|
|
|
* The formula is:
|
|
|
* bit_rate = channel*wordwidth - 1
|
|
|
* 48kHz sample rate for 16 bit stereo date requires
|
|
|
* a bit rate of 48000*16*2=1536MHz (MCLK)
|
|
|
*/
|
|
|
uint32_t i2sPclk;
|
|
|
uint64_t divider;
|
|
|
uint8_t bitrate, channel, wordwidth;
|
|
|
uint32_t x, y;
|
|
|
uint16_t dif;
|
|
|
uint16_t error;
|
|
|
uint8_t x_divide, y_divide;
|
|
|
uint16_t ErrorOptimal = 0xFFFF;
|
|
|
|
|
|
CHECK_PARAM(PARAM_I2Sx(I2Sx));
|
|
|
CHECK_PARAM(PRAM_I2S_FREQ(Freq));
|
|
|
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
|
|
|
|
|
|
i2sPclk = 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);
|
|
|
}
|
|
|
bitrate = channel * wordwidth - 1;
|
|
|
if (TRMode == I2S_TX_MODE)// Transmitter
|
|
|
{
|
|
|
I2Sx->I2STXBITRATE = bitrate;
|
|
|
} else //Receiver
|
|
|
{
|
|
|
I2Sx->I2SRXBITRATE = bitrate;
|
|
|
}
|
|
|
/* 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 * (X/Y) / 2
|
|
|
* We have:
|
|
|
* I2S_MCLK = Freq * bit_rate;
|
|
|
* So: (X/Y) = (Freq * bit_rate)/PCLK*2
|
|
|
* We use a loop function to chose the most suitable X,Y value
|
|
|
*/
|
|
|
|
|
|
divider = ((uint64_t)(Freq *( bitrate+1)* 2)<<16) / i2sPclk;
|
|
|
for (y = 255; y > 0; y--) {
|
|
|
x = y * divider;
|
|
|
dif = x & 0xFFFF;
|
|
|
if(dif>0x8000) error = 0x10000-dif;
|
|
|
else error = dif;
|
|
|
if (error == 0)
|
|
|
{
|
|
|
y_divide = y;
|
|
|
break;
|
|
|
}
|
|
|
else if (error < ErrorOptimal)
|
|
|
{
|
|
|
ErrorOptimal = error;
|
|
|
y_divide = y;
|
|
|
}
|
|
|
}
|
|
|
x_divide = (y_divide * Freq *( bitrate+1)* 2)/i2sPclk;
|
|
|
if (TRMode == I2S_TX_MODE)// Transmitter
|
|
|
{
|
|
|
I2Sx->I2STXRATE = y_divide | (x_divide << 8);
|
|
|
} else //Receiver
|
|
|
{
|
|
|
I2Sx->I2SRXRATE = y_divide | (x_divide << 8);
|
|
|
}
|
|
|
return SUCCESS;
|
|
|
}
|
|
|
/********************************************************************//**
|
|
|
* @brief I2S set bitrate
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: I2S
|
|
|
* @param[in] bitrate value will be set
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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 -1);
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
I2Sx->I2SRXBITRATE = (bitrate -1);
|
|
|
}
|
|
|
}
|
|
|
/********************************************************************//**
|
|
|
* @brief Configuration operating mode for I2S
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: I2S
|
|
|
* @param[in] ModeConfig pointer to I2S_MODEConf_Type will be used to
|
|
|
* configure, should be:
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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_1) {
|
|
|
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_1) {
|
|
|
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: 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: transmit mode
|
|
|
* - I2S_RX_MODE: 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: I2S
|
|
|
* @param[in] DMAIndex chose what DMA is used, should be:
|
|
|
* - I2S_DMA_1: DMA1
|
|
|
* - I2S_DMA_2: DMA2
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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: I2S
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: receive mode
|
|
|
* @param[in] level: is the FIFO level that triggers IRQ request
|
|
|
* @param[in] pfnI2SCbs: the pointer to call-back function handle this interrupt
|
|
|
* @return none
|
|
|
*********************************************************************/
|
|
|
void I2S_IRQConfig(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, uint8_t level, fnI2SCbs_Type *pfnI2SCbs) {
|
|
|
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);
|
|
|
}
|
|
|
//setup Call-Back funtion for receive interrupt
|
|
|
_apfnI2SCbs[TRMode] = pfnI2SCbs;
|
|
|
}
|
|
|
|
|
|
/********************************************************************//**
|
|
|
* @brief Enable/Disable IRQ for I2S
|
|
|
* @param[in] I2Sx: I2S peripheral selected, should be: I2S
|
|
|
* @param[in] TRMode is transmit/receive mode, should be:
|
|
|
* - I2S_TX_MODE: transmit mode
|
|
|
* - I2S_RX_MODE: 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 Standard I2S interrupt handler, this function will check
|
|
|
* all interrupt status of I2S channels, then execute the call
|
|
|
* back function if they're already installed
|
|
|
* @param[in] None
|
|
|
* @return None
|
|
|
**********************************************************************/
|
|
|
void I2S_IntHandler(void)
|
|
|
{
|
|
|
uint8_t rx_level,
|
|
|
tx_level,
|
|
|
tx_depth_irq,
|
|
|
rx_depth_irq;
|
|
|
|
|
|
|
|
|
if((LPC_I2S->I2SIRQ)& 0x01){ //receive interrupt
|
|
|
rx_level = ((LPC_I2S->I2SSTATE)>>8)&0xFF;
|
|
|
rx_depth_irq = ((LPC_I2S->I2SIRQ)>>8)&0xFF;
|
|
|
|
|
|
if (rx_level >= rx_depth_irq)//receive interrupt
|
|
|
{
|
|
|
_apfnI2SCbs[1]();
|
|
|
}
|
|
|
}
|
|
|
else if(((LPC_I2S->I2SIRQ)>>1)& 0x01)
|
|
|
{
|
|
|
tx_level = ((LPC_I2S->I2SSTATE)>>16)&0xFF;
|
|
|
tx_depth_irq = ((LPC_I2S->I2SIRQ)>>16)&0xFF;
|
|
|
if(tx_level <= tx_depth_irq)//transmit interrupt
|
|
|
{
|
|
|
_apfnI2SCbs[0]();
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
#endif /* _I2S */
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/* --------------------------------- End Of File ------------------------------ */
|
|
|
|
|
|
|
