lpc17xx_i2s.c
653 lines
| 20.5 KiB
| text/x-c
|
CLexer
jeandet@pc-de-jeandet3.LAB-LPP.LOCAL
|
r18 | /** | ||
* @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 ------------------------------ */ | ||||