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lpc17xx_i2s.c
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00001 /***********************************************************************//** 00002 * @file lpc17xx_i2s.c 00003 * @brief Contains all functions support for I2S firmware library on LPC17xx 00004 * @version 3.0 00005 * @date 18. June. 2010 00006 * @author NXP MCU SW Application Team 00007 ************************************************************************** 00008 * Software that is described herein is for illustrative purposes only 00009 * which provides customers with programming information regarding the 00010 * products. This software is supplied "AS IS" without any warranties. 00011 * NXP Semiconductors assumes no responsibility or liability for the 00012 * use of the software, conveys no license or title under any patent, 00013 * copyright, or mask work right to the product. NXP Semiconductors 00014 * reserves the right to make changes in the software without 00015 * notification. NXP Semiconductors also make no representation or 00016 * warranty that such application will be suitable for the specified 00017 * use without further testing or modification. 00018 **********************************************************************/ 00019 00020 /* Peripheral group ----------------------------------------------------------- */ 00021 /** @addtogroup I2S 00022 * @{ 00023 */ 00024 00025 /* Includes ------------------------------------------------------------------- */ 00026 //#include "mbed.h" 00027 #include "lpc17xx_i2s.h" 00028 #include "lpc17xx_clkpwr.h" 00029 #include "mbed.h" 00030 00031 00032 /* If this source file built with example, the LPC17xx FW library configuration 00033 * file in each example directory ("lpc17xx_libcfg.h") must be included, 00034 * otherwise the default FW library configuration file must be included instead 00035 */ 00036 #ifdef __BUILD_WITH_EXAMPLE__ 00037 #include "lpc17xx_libcfg.h" 00038 #else 00039 #include "lpc17xx_libcfg_default.h" 00040 #endif /* __BUILD_WITH_EXAMPLE__ */ 00041 00042 00043 #ifdef _I2S 00044 00045 /* Private Functions ---------------------------------------------------------- */ 00046 00047 static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode); 00048 static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode); 00049 00050 /********************************************************************//** 00051 * @brief Get I2S wordwidth value 00052 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00053 * @param[in] TRMode is the I2S mode, should be: 00054 * - I2S_TX_MODE = 0: transmit mode 00055 * - I2S_RX_MODE = 1: receive mode 00056 * @return The wordwidth value, should be: 8,16 or 32 00057 *********************************************************************/ 00058 static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) { 00059 uint8_t value; 00060 00061 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00062 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00063 00064 if (TRMode == I2S_TX_MODE) { 00065 value = (I2Sx->I2SDAO) & 0x03; /* get wordwidth bit */ 00066 } else { 00067 value = (I2Sx->I2SDAI) & 0x03; /* get wordwidth bit */ 00068 } 00069 switch (value) { 00070 case I2S_WORDWIDTH_8: 00071 return 8; 00072 case I2S_WORDWIDTH_16: 00073 return 16; 00074 default: 00075 return 32; 00076 } 00077 } 00078 00079 /********************************************************************//** 00080 * @brief Get I2S channel value 00081 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00082 * @param[in] TRMode is the I2S mode, should be: 00083 * - I2S_TX_MODE = 0: transmit mode 00084 * - I2S_RX_MODE = 1: receive mode 00085 * @return The channel value, should be: 1(mono) or 2(stereo) 00086 *********************************************************************/ 00087 static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) { 00088 uint8_t value; 00089 00090 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00091 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00092 00093 if (TRMode == I2S_TX_MODE) { 00094 value = (I2Sx->I2SDAO) & 0x04; /* get bit[2] */ 00095 } else { 00096 value = (I2Sx->I2SDAI) & 0x04; /* get bit[2] */ 00097 } 00098 if(value == I2S_MONO) return 1; 00099 return 2; 00100 } 00101 00102 /* End of Private Functions --------------------------------------------------- */ 00103 00104 00105 /* Public Functions ----------------------------------------------------------- */ 00106 /** @addtogroup I2S_Public_Functions 00107 * @{ 00108 */ 00109 00110 /********************************************************************//** 00111 * @brief Initialize I2S 00112 * - Turn on power and clock 00113 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00114 * @return none 00115 *********************************************************************/ 00116 void I2S_Init(LPC_I2S_TypeDef *I2Sx) { 00117 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00118 00119 // Turn on power and clock 00120 CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, ENABLE); 00121 LPC_I2S->I2SDAI = LPC_I2S->I2SDAO = 0x00; 00122 } 00123 00124 /********************************************************************//** 00125 * @brief Configuration I2S, setting: 00126 * - master/slave mode 00127 * - wordwidth value 00128 * - channel mode 00129 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00130 * @param[in] TRMode transmit/receive mode, should be: 00131 * - I2S_TX_MODE = 0: transmit mode 00132 * - I2S_RX_MODE = 1: receive mode 00133 * @param[in] ConfigStruct pointer to I2S_CFG_Type structure 00134 * which will be initialized. 00135 * @return none 00136 *********************************************************************/ 00137 void I2S_Config(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, I2S_CFG_Type* ConfigStruct) 00138 { 00139 uint32_t bps, config; 00140 00141 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00142 00143 CHECK_PARAM(PARAM_I2S_WORDWIDTH(ConfigStruct->wordwidth)); 00144 CHECK_PARAM(PARAM_I2S_CHANNEL(ConfigStruct->mono)); 00145 CHECK_PARAM(PARAM_I2S_STOP(ConfigStruct->stop)); 00146 CHECK_PARAM(PARAM_I2S_RESET(ConfigStruct->reset)); 00147 CHECK_PARAM(PARAM_I2S_WS_SEL(ConfigStruct->ws_sel)); 00148 CHECK_PARAM(PARAM_I2S_MUTE(ConfigStruct->mute)); 00149 00150 /* Setup clock */ 00151 bps = (ConfigStruct->wordwidth +1)*8; 00152 00153 /* Calculate audio config */ 00154 config = (bps - 1)<<6 | (ConfigStruct->ws_sel)<<5 | (ConfigStruct->reset)<<4 | 00155 (ConfigStruct->stop)<<3 | (ConfigStruct->mono)<<2 | (ConfigStruct->wordwidth); 00156 00157 if(TRMode == I2S_RX_MODE){ 00158 LPC_I2S->I2SDAI = config; 00159 }else{ 00160 LPC_I2S->I2SDAO = config; 00161 } 00162 } 00163 00164 /********************************************************************//** 00165 * @brief DeInitial both I2S transmit or receive 00166 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00167 * @return none 00168 *********************************************************************/ 00169 void I2S_DeInit(LPC_I2S_TypeDef *I2Sx) { 00170 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00171 00172 // Turn off power and clock 00173 CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, DISABLE); 00174 } 00175 00176 /********************************************************************//** 00177 * @brief Get I2S Buffer Level 00178 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00179 * @param[in] TRMode Transmit/receive mode, should be: 00180 * - I2S_TX_MODE = 0: transmit mode 00181 * - I2S_RX_MODE = 1: receive mode 00182 * @return current level of Transmit/Receive Buffer 00183 *********************************************************************/ 00184 uint8_t I2S_GetLevel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) 00185 { 00186 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00187 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00188 00189 if(TRMode == I2S_TX_MODE) 00190 { 00191 return ((I2Sx->I2SSTATE >> 16) & 0xFF); 00192 } 00193 else 00194 { 00195 return ((I2Sx->I2SSTATE >> 8) & 0xFF); 00196 } 00197 } 00198 00199 /********************************************************************//** 00200 * @brief I2S Start: clear all STOP,RESET and MUTE bit, ready to operate 00201 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00202 * @return none 00203 *********************************************************************/ 00204 void I2S_Start(LPC_I2S_TypeDef *I2Sx) 00205 { 00206 //Clear STOP,RESET and MUTE bit 00207 I2Sx->I2SDAO &= ~I2S_DAI_RESET; 00208 I2Sx->I2SDAI &= ~I2S_DAI_RESET; 00209 I2Sx->I2SDAO &= ~I2S_DAI_STOP; 00210 I2Sx->I2SDAI &= ~I2S_DAI_STOP; 00211 I2Sx->I2SDAO &= ~I2S_DAI_MUTE; 00212 } 00213 00214 /********************************************************************//** 00215 * @brief I2S Send data 00216 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00217 * @param[in] BufferData pointer to uint32_t is the data will be send 00218 * @return none 00219 *********************************************************************/ 00220 void I2S_Send(LPC_I2S_TypeDef *I2Sx, uint32_t BufferData) { 00221 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00222 00223 I2Sx->I2STXFIFO = BufferData; 00224 } 00225 00226 /********************************************************************//** 00227 * @brief I2S Receive Data 00228 * @param[in] I2Sx pointer to LPC_I2S_TypeDef 00229 * @return received value 00230 *********************************************************************/ 00231 uint32_t I2S_Receive(LPC_I2S_TypeDef* I2Sx) { 00232 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00233 00234 return (I2Sx->I2SRXFIFO); 00235 00236 } 00237 00238 /********************************************************************//** 00239 * @brief I2S Pause 00240 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00241 * @param[in] TRMode is transmit/receive mode, should be: 00242 * - I2S_TX_MODE = 0: transmit mode 00243 * - I2S_RX_MODE = 1: receive mode 00244 * @return none 00245 *********************************************************************/ 00246 void I2S_Pause(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) { 00247 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00248 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00249 00250 if (TRMode == I2S_TX_MODE) //Transmit mode 00251 { 00252 I2Sx->I2SDAO |= I2S_DAO_STOP; 00253 } else //Receive mode 00254 { 00255 I2Sx->I2SDAI |= I2S_DAI_STOP; 00256 } 00257 } 00258 00259 /********************************************************************//** 00260 * @brief I2S Mute 00261 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00262 * @param[in] TRMode is transmit/receive mode, should be: 00263 * - I2S_TX_MODE = 0: transmit mode 00264 * - I2S_RX_MODE = 1: receive mode 00265 * @return none 00266 *********************************************************************/ 00267 void I2S_Mute(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) { 00268 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00269 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00270 00271 if (TRMode == I2S_TX_MODE) //Transmit mode 00272 { 00273 I2Sx->I2SDAO |= I2S_DAO_MUTE; 00274 } else //Receive mode 00275 { 00276 I2Sx->I2SDAI |= I2S_DAI_MUTE; 00277 } 00278 } 00279 00280 /********************************************************************//** 00281 * @brief I2S Stop 00282 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00283 * @param[in] TRMode is transmit/receive mode, should be: 00284 * - I2S_TX_MODE = 0: transmit mode 00285 * - I2S_RX_MODE = 1: receive mode 00286 * @return none 00287 *********************************************************************/ 00288 void I2S_Stop(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) { 00289 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00290 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00291 00292 if (TRMode == I2S_TX_MODE) //Transmit mode 00293 { 00294 I2Sx->I2SDAO &= ~I2S_DAO_MUTE; 00295 I2Sx->I2SDAO |= I2S_DAO_STOP; 00296 I2Sx->I2SDAO |= I2S_DAO_RESET; 00297 } else //Receive mode 00298 { 00299 I2Sx->I2SDAI |= I2S_DAI_STOP; 00300 I2Sx->I2SDAI |= I2S_DAI_RESET; 00301 } 00302 } 00303 00304 /********************************************************************//** 00305 * @brief Set frequency for I2S 00306 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00307 * @param[in] Freq is the frequency for I2S will be set. It can range 00308 * from 16-96 kHz(16, 22.05, 32, 44.1, 48, 96kHz) 00309 * @param[in] TRMode is transmit/receive mode, should be: 00310 * - I2S_TX_MODE = 0: transmit mode 00311 * - I2S_RX_MODE = 1: receive mode 00312 * @return Status: ERROR or SUCCESS 00313 *********************************************************************/ 00314 Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) { 00315 00316 /* Calculate bit rate 00317 * The formula is: 00318 * bit_rate = channel*wordwidth - 1 00319 * 48kHz sample rate for 16 bit stereo date requires 00320 * a bit rate of 48000*16*2=1536MHz (MCLK) 00321 */ 00322 uint32_t i2sPclk; 00323 uint64_t divider; 00324 uint8_t bitrate, channel, wordwidth; 00325 uint32_t x, y; 00326 uint16_t dif; 00327 uint16_t error; 00328 uint8_t x_divide, y_divide=0; 00329 uint16_t ErrorOptimal = 0xFFFF; 00330 00331 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00332 CHECK_PARAM(PRAM_I2S_FREQ(Freq)); 00333 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00334 00335 i2sPclk = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_I2S); 00336 printf("I2S_PCLK = %dHz\r\n",i2sPclk); 00337 if(TRMode == I2S_TX_MODE) 00338 { 00339 channel = i2s_GetChannel(I2Sx,I2S_TX_MODE); 00340 wordwidth = i2s_GetWordWidth(I2Sx,I2S_TX_MODE); 00341 } 00342 else 00343 { 00344 channel = i2s_GetChannel(I2Sx,I2S_RX_MODE); 00345 wordwidth = i2s_GetWordWidth(I2Sx,I2S_RX_MODE); 00346 } 00347 bitrate = channel * wordwidth - 1; 00348 if (TRMode == I2S_TX_MODE)// Transmitter 00349 { 00350 I2Sx->I2STXBITRATE = bitrate; 00351 } else //Receiver 00352 { 00353 I2Sx->I2SRXBITRATE = bitrate; 00354 } 00355 printf("TX CHANNEL= %d\r\n",i2s_GetChannel(I2Sx,I2S_TX_MODE)); 00356 printf("TX WORDWIDTH= %dbits \r\n",i2s_GetWordWidth(I2Sx,I2S_TX_MODE)); 00357 printf("I2STXBITRATE= %d,bitrate= %d \r\n",I2Sx->I2STXBITRATE,bitrate); 00358 /* Calculate X and Y divider 00359 * The MCLK rate for the I2S transmitter is determined by the value 00360 * in the I2STXRATE/I2SRXRATE register. The required I2STXRATE/I2SRXRATE 00361 * setting depends on the desired audio sample rate desired, the format 00362 * (stereo/mono) used, and the data size. 00363 * The formula is: 00364 * I2S_MCLK = PCLK * (X/Y) / 2 00365 * We have: 00366 * I2S_MCLK = Freq * bit_rate; 00367 * So: (X/Y) = (Freq * bit_rate)/PCLK*2 00368 * We use a loop function to chose the most suitable X,Y value 00369 */ 00370 00371 divider = ((uint64_t)(Freq *( bitrate+1)/* * 2*/)<<16) / i2sPclk; 00372 for (y = 255; y > 0; y--) { 00373 x = y * divider; 00374 dif = x & 0xFFFF; 00375 if(dif>0x8000) error = 0x10000-dif; 00376 else error = dif; 00377 if (error == 0) 00378 { 00379 y_divide = y; 00380 break; 00381 } 00382 else if (error < ErrorOptimal) 00383 { 00384 ErrorOptimal = error; 00385 y_divide = y; 00386 } 00387 } 00388 //y_divide--;//for test 00389 x_divide = (y_divide * Freq *( bitrate+1)* 2)/i2sPclk; 00390 if (TRMode == I2S_TX_MODE)// Transmitter 00391 { 00392 I2Sx->I2STXRATE = y_divide | (x_divide << 8); 00393 } else //Receiver 00394 { 00395 I2Sx->I2SRXRATE = y_divide | (x_divide << 8); 00396 } 00397 00398 printf("I2STXRATE=%d, x_divide=%d, y_divide=%d \r\n",I2Sx->I2STXRATE,x_divide,y_divide); 00399 return SUCCESS; 00400 } 00401 00402 /********************************************************************//** 00403 * @brief I2S set bitrate 00404 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00405 * @param[in] bitrate value will be set, it can be calculate as follows: 00406 * bitrate = channel * wordwidth - 1 00407 * bitrate value should be in range: 0 .. 63 00408 * @param[in] TRMode is transmit/receive mode, should be: 00409 * - I2S_TX_MODE = 0: transmit mode 00410 * - I2S_RX_MODE = 1: receive mode 00411 * @return none 00412 *********************************************************************/ 00413 void I2S_SetBitRate(LPC_I2S_TypeDef *I2Sx, uint8_t bitrate, uint8_t TRMode) 00414 { 00415 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00416 CHECK_PARAM(PARAM_I2S_BITRATE(bitrate)); 00417 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00418 00419 if(TRMode == I2S_TX_MODE) 00420 { 00421 I2Sx->I2STXBITRATE = bitrate; 00422 } 00423 else 00424 { 00425 I2Sx->I2SRXBITRATE = bitrate; 00426 } 00427 } 00428 00429 /********************************************************************//** 00430 * @brief Configuration operating mode for I2S 00431 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00432 * @param[in] ModeConfig pointer to I2S_MODEConf_Type will be used to 00433 * configure 00434 * @param[in] TRMode is transmit/receive mode, should be: 00435 * - I2S_TX_MODE = 0: transmit mode 00436 * - I2S_RX_MODE = 1: receive mode 00437 * @return none 00438 *********************************************************************/ 00439 void I2S_ModeConfig(LPC_I2S_TypeDef *I2Sx, I2S_MODEConf_Type* ModeConfig, 00440 uint8_t TRMode) 00441 { 00442 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00443 CHECK_PARAM(PARAM_I2S_CLKSEL(ModeConfig->clksel)); 00444 CHECK_PARAM(PARAM_I2S_4PIN(ModeConfig->fpin)); 00445 CHECK_PARAM(PARAM_I2S_MCLK(ModeConfig->mcena)); 00446 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00447 00448 if (TRMode == I2S_TX_MODE) { 00449 I2Sx->I2STXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register 00450 if (ModeConfig->clksel == I2S_CLKSEL_MCLK) { 00451 I2Sx->I2STXMODE |= 0x02; 00452 } 00453 if (ModeConfig->fpin == I2S_4PIN_ENABLE) { 00454 I2Sx->I2STXMODE |= (1 << 2); 00455 } 00456 if (ModeConfig->mcena == I2S_MCLK_ENABLE) { 00457 I2Sx->I2STXMODE |= (1 << 3); 00458 } 00459 } else { 00460 I2Sx->I2SRXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register 00461 if (ModeConfig->clksel == I2S_CLKSEL_MCLK) { 00462 I2Sx->I2SRXMODE |= 0x02; 00463 } 00464 if (ModeConfig->fpin == I2S_4PIN_ENABLE) { 00465 I2Sx->I2SRXMODE |= (1 << 2); 00466 } 00467 if (ModeConfig->mcena == I2S_MCLK_ENABLE) { 00468 I2Sx->I2SRXMODE |= (1 << 3); 00469 } 00470 } 00471 } 00472 00473 /********************************************************************//** 00474 * @brief Configure DMA operation for I2S 00475 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00476 * @param[in] DMAConfig pointer to I2S_DMAConf_Type will be used to configure 00477 * @param[in] TRMode is transmit/receive mode, should be: 00478 * - I2S_TX_MODE = 0: transmit mode 00479 * - I2S_RX_MODE = 1: receive mode 00480 * @return none 00481 *********************************************************************/ 00482 void I2S_DMAConfig(LPC_I2S_TypeDef *I2Sx, I2S_DMAConf_Type* DMAConfig, 00483 uint8_t TRMode) 00484 { 00485 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00486 CHECK_PARAM(PARAM_I2S_DMA(DMAConfig->DMAIndex)); 00487 CHECK_PARAM(PARAM_I2S_DMA_DEPTH(DMAConfig->depth)); 00488 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00489 00490 if (TRMode == I2S_RX_MODE) { 00491 if (DMAConfig->DMAIndex == I2S_DMA_1) { 00492 LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 8; 00493 } else { 00494 LPC_I2S->I2SDMA2 = (DMAConfig->depth) << 8; 00495 } 00496 } else { 00497 if (DMAConfig->DMAIndex == I2S_DMA_1) { 00498 LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 16; 00499 } else { 00500 LPC_I2S->I2SDMA2 = (DMAConfig->depth) << 16; 00501 } 00502 } 00503 } 00504 00505 /********************************************************************//** 00506 * @brief Enable/Disable DMA operation for I2S 00507 * @param[in] I2Sx: I2S peripheral selected, should be: LPC_I2S 00508 * @param[in] DMAIndex chose what DMA is used, should be: 00509 * - I2S_DMA_1 = 0: DMA1 00510 * - I2S_DMA_2 = 1: DMA2 00511 * @param[in] TRMode is transmit/receive mode, should be: 00512 * - I2S_TX_MODE = 0: transmit mode 00513 * - I2S_RX_MODE = 1: receive mode 00514 * @param[in] NewState is new state of DMA operation, should be: 00515 * - ENABLE 00516 * - DISABLE 00517 * @return none 00518 *********************************************************************/ 00519 void I2S_DMACmd(LPC_I2S_TypeDef *I2Sx, uint8_t DMAIndex, uint8_t TRMode, 00520 FunctionalState NewState) 00521 { 00522 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00523 CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); 00524 CHECK_PARAM(PARAM_I2S_DMA(DMAIndex)); 00525 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00526 00527 if (TRMode == I2S_RX_MODE) { 00528 if (DMAIndex == I2S_DMA_1) { 00529 if (NewState == ENABLE) 00530 I2Sx->I2SDMA1 |= 0x01; 00531 else 00532 I2Sx->I2SDMA1 &= ~0x01; 00533 } else { 00534 if (NewState == ENABLE) 00535 I2Sx->I2SDMA2 |= 0x01; 00536 else 00537 I2Sx->I2SDMA2 &= ~0x01; 00538 } 00539 } else { 00540 if (DMAIndex == I2S_DMA_1) { 00541 if (NewState == ENABLE) 00542 I2Sx->I2SDMA1 |= 0x02; 00543 else 00544 I2Sx->I2SDMA1 &= ~0x02; 00545 } else { 00546 if (NewState == ENABLE) 00547 I2Sx->I2SDMA2 |= 0x02; 00548 else 00549 I2Sx->I2SDMA2 &= ~0x02; 00550 } 00551 } 00552 } 00553 00554 /********************************************************************//** 00555 * @brief Configure IRQ for I2S 00556 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00557 * @param[in] TRMode is transmit/receive mode, should be: 00558 * - I2S_TX_MODE = 0: transmit mode 00559 * - I2S_RX_MODE = 1: receive mode 00560 * @param[in] level is the FIFO level that triggers IRQ request 00561 * @return none 00562 *********************************************************************/ 00563 void I2S_IRQConfig(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, uint8_t level) { 00564 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00565 CHECK_PARAM(PARAM_I2S_TRX(TRMode)); 00566 CHECK_PARAM(PARAM_I2S_IRQ_LEVEL(level)); 00567 00568 if (TRMode == I2S_RX_MODE) { 00569 I2Sx->I2SIRQ |= (level << 8); 00570 } else { 00571 I2Sx->I2SIRQ |= (level << 16); 00572 } 00573 } 00574 00575 /********************************************************************//** 00576 * @brief Enable/Disable IRQ for I2S 00577 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00578 * @param[in] TRMode is transmit/receive mode, should be: 00579 * - I2S_TX_MODE = 0: transmit mode 00580 * - I2S_RX_MODE = 1: receive mode 00581 * @param[in] NewState is new state of DMA operation, should be: 00582 * - ENABLE 00583 * - DISABLE 00584 * @return none 00585 *********************************************************************/ 00586 void I2S_IRQCmd(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, FunctionalState NewState) { 00587 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00588 CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); 00589 00590 if (TRMode == I2S_RX_MODE) { 00591 if (NewState == ENABLE) 00592 I2Sx->I2SIRQ |= 0x01; 00593 else 00594 I2Sx->I2SIRQ &= ~0x01; 00595 //Enable DMA 00596 00597 } else { 00598 if (NewState == ENABLE) 00599 I2Sx->I2SIRQ |= 0x02; 00600 else 00601 I2Sx->I2SIRQ &= ~0x02; 00602 } 00603 } 00604 00605 /********************************************************************//** 00606 * @brief Get I2S interrupt status 00607 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00608 * @param[in] TRMode is transmit/receive mode, should be: 00609 * - I2S_TX_MODE = 0: transmit mode 00610 * - I2S_RX_MODE = 1: receive mode 00611 * @return FunctionState should be: 00612 * - ENABLE: interrupt is enable 00613 * - DISABLE: interrupt is disable 00614 *********************************************************************/ 00615 FunctionalState I2S_GetIRQStatus(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode) 00616 { 00617 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00618 if(TRMode == I2S_TX_MODE) 00619 return (FunctionalState)((I2Sx->I2SIRQ >> 1)&0x01); 00620 else 00621 return (FunctionalState)((I2Sx->I2SIRQ)&0x01); 00622 } 00623 00624 /********************************************************************//** 00625 * @brief Get I2S interrupt depth 00626 * @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S 00627 * @param[in] TRMode is transmit/receive mode, should be: 00628 * - I2S_TX_MODE = 0: transmit mode 00629 * - I2S_RX_MODE = 1: receive mode 00630 * @return depth of FIFO level on which to create an irq request 00631 *********************************************************************/ 00632 uint8_t I2S_GetIRQDepth(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode) 00633 { 00634 CHECK_PARAM(PARAM_I2Sx(I2Sx)); 00635 if(TRMode == I2S_TX_MODE) 00636 return (((I2Sx->I2SIRQ)>>16)&0xFF); 00637 else 00638 return (((I2Sx->I2SIRQ)>>8)&0xFF); 00639 } 00640 /** 00641 * @} 00642 */ 00643 00644 #endif /* _I2S */ 00645 00646 /** 00647 * @} 00648 */ 00649 00650 /* --------------------------------- End Of File ------------------------------ */
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