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teensy-audio/output_pt8211.cpp

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  1. /* Audio Library for Teensy 3.X

  2.  * Copyright (c) 2016, Paul Stoffregen, paul@pjrc.com

  3.  *

  4.  * Development of this audio library was funded by PJRC.COM, LLC by sales of

  5.  * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop

  6.  * open source software by purchasing Teensy or other PJRC products.

  7.  *

  8.  * Permission is hereby granted, free of charge, to any person obtaining a copy

  9.  * of this software and associated documentation files (the "Software"), to deal

  10.  * in the Software without restriction, including without limitation the rights

  11.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  12.  * copies of the Software, and to permit persons to whom the Software is

  13.  * furnished to do so, subject to the following conditions:

  14.  *

  15.  * The above copyright notice, development funding notice, and this permission

  16.  * notice shall be included in all copies or substantial portions of the Software.

  17.  *

  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  19.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  20.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  21.  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  22.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  23.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  24.  * THE SOFTWARE.

  25.  */

  26. 

  27. //Adapted to PT8211, Frank Bösing, Ben-Rheinland

  28. 

  29. 

  30. #include <Arduino.h>

  31. #include "output_pt8211.h"

  32. #include "memcpy_audio.h"

  33. #include "utility/imxrt_hw.h"

  34. 

  35. audio_block_t * AudioOutputPT8211::block_left_1st = NULL;

  36. audio_block_t * AudioOutputPT8211::block_right_1st = NULL;

  37. audio_block_t * AudioOutputPT8211::block_left_2nd = NULL;

  38. audio_block_t * AudioOutputPT8211::block_right_2nd = NULL;

  39. uint16_t  AudioOutputPT8211::block_left_offset = 0;

  40. uint16_t  AudioOutputPT8211::block_right_offset = 0;

  41. bool AudioOutputPT8211::update_responsibility = false;

  42. #if defined(AUDIO_PT8211_OVERSAMPLING)

  43. 	static uint32_t i2s_tx_buffer[AUDIO_BLOCK_SAMPLES*4];

  44. #else

  45. 	static uint32_t i2s_tx_buffer[AUDIO_BLOCK_SAMPLES];

  46. #endif

  47. DMAChannel AudioOutputPT8211::dma(false);

  48. 

  49. void AudioOutputPT8211::begin(void)

  50. {

  51. 	dma.begin(true); // Allocate the DMA channel first

  52. 

  53. 	block_left_1st = NULL;

  54. 	block_right_1st = NULL;

  55. 

  56. 	// TODO: should we set & clear the I2S_TCSR_SR bit here?

  57. 	config_i2s();

  58. #if defined(KINETISK)

  59. 	CORE_PIN22_CONFIG = PORT_PCR_MUX(6); // pin 22, PTC1, I2S0_TXD0

  60. 

  61. 	dma.TCD->SADDR = i2s_tx_buffer;

  62. 	dma.TCD->SOFF = 2;

  63. 	dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);

  64. 	dma.TCD->NBYTES_MLNO = 2;

  65. 	dma.TCD->SLAST = -sizeof(i2s_tx_buffer);

  66. 	dma.TCD->DADDR = &I2S0_TDR0;

  67. 	dma.TCD->DOFF = 0;

  68. 	dma.TCD->CITER_ELINKNO = sizeof(i2s_tx_buffer) / 2;

  69. 	dma.TCD->DLASTSGA = 0;

  70. 	dma.TCD->BITER_ELINKNO = sizeof(i2s_tx_buffer) / 2;

  71. 	dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;

  72. 

  73. 	dma.triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_TX);

  74. 	I2S0_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE | I2S_TCSR_FR;

  75. 

  76. #elif defined(__IMXRT1052__) || defined(__IMXRT1062__)

  77. 

  78. 	CORE_PIN6_CONFIG  = 3;  //1:TX_DATA0

  79. 

  80. 	dma.TCD->SADDR = i2s_tx_buffer;

  81. 	dma.TCD->SOFF = 2;

  82. 	dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);

  83. 	dma.TCD->NBYTES_MLNO = 2;

  84. 	dma.TCD->SLAST = -sizeof(i2s_tx_buffer);

  85. 	dma.TCD->DOFF = 0;

  86. 	dma.TCD->CITER_ELINKNO = sizeof(i2s_tx_buffer) / 2;

  87. 	dma.TCD->DLASTSGA = 0;

  88. 	dma.TCD->BITER_ELINKNO = sizeof(i2s_tx_buffer) / 2;

  89. 	dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;

  90. 	dma.TCD->DADDR = (void *)((uint32_t)&I2S1_TDR0);

  91. 	dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SAI1_TX);

  92. 

  93. 	I2S1_RCSR |= I2S_RCSR_RE;

  94. 	I2S1_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE;

  95. #endif

  96. 	update_responsibility = update_setup();

  97. 	dma.attachInterrupt(isr);

  98. 	dma.enable();

  99. }

  100. 

  101. void AudioOutputPT8211::isr(void)

  102. {

  103. 	int16_t *dest;

  104. 	audio_block_t *blockL, *blockR;

  105. 	uint32_t saddr, offsetL, offsetR;

  106. 

  107. 	saddr = (uint32_t)(dma.TCD->SADDR);

  108. 	dma.clearInterrupt();

  109. 	if (saddr < (uint32_t)i2s_tx_buffer + sizeof(i2s_tx_buffer) / 2) {

  110. 		// DMA is transmitting the first half of the buffer

  111. 		// so we must fill the second half

  112. 		#if defined(AUDIO_PT8211_OVERSAMPLING)

  113. 			dest = (int16_t *)&i2s_tx_buffer[(AUDIO_BLOCK_SAMPLES/2)*4];

  114. 		#else

  115. 			dest = (int16_t *)&i2s_tx_buffer[AUDIO_BLOCK_SAMPLES/2];

  116. 		#endif

  117. 		if (AudioOutputPT8211::update_responsibility) AudioStream::update_all();

  118. 	} else {

  119. 		// DMA is transmitting the second half of the buffer

  120. 		// so we must fill the first half

  121. 		dest = (int16_t *)i2s_tx_buffer;

  122. 	}

  123. 

  124. 	blockL = AudioOutputPT8211::block_left_1st;

  125. 	blockR = AudioOutputPT8211::block_right_1st;

  126. 	offsetL = AudioOutputPT8211::block_left_offset;

  127. 	offsetR = AudioOutputPT8211::block_right_offset;

  128. 

  129. 	#if defined(AUDIO_PT8211_OVERSAMPLING)

  130. 		static int32_t oldL = 0;

  131. 		static int32_t oldR = 0;

  132. 	#endif

  133. 	if (blockL && blockR) {

  134. 		#if defined(AUDIO_PT8211_OVERSAMPLING)

  135. 			#if defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  136. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetL++, offsetR++) {

  137. 					int32_t valL = blockL->data[offsetL];

  138. 					int32_t valR = blockR->data[offsetR];

  139. 					int32_t nL = (oldL+valL) >> 1;

  140. 					int32_t nR = (oldR+valR) >> 1;

  141. 					*(dest+0) = (oldL+nL) >> 1;

  142. 					*(dest+1) = (oldR+nR) >> 1;

  143. 					*(dest+2) = nL;

  144. 					*(dest+3) = nR;

  145. 					*(dest+4) = (nL+valL) >> 1;

  146. 					*(dest+5) = (nR+valR) >> 1;

  147. 					*(dest+6) = valL;

  148. 					*(dest+7) = valR;

  149. 					dest+=8;

  150. 					oldL = valL;

  151. 					oldR = valR;

  152. 				}

  153. 			#elif defined(AUDIO_PT8211_INTERPOLATION_CIC)

  154. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetL++, offsetR++) {

  155. 					int32_t valL = blockL->data[offsetL];

  156. 					int32_t valR = blockR->data[offsetR];

  157. 

  158. 					int32_t combL[3] = {0};

  159. 					static int32_t combLOld[2] = {0};

  160. 					int32_t combR[3] = {0};

  161. 					static int32_t combROld[2] = {0};

  162. 

  163. 					combL[0] = valL - oldL;

  164. 					combR[0] = valR - oldR;

  165. 					combL[1] = combL[0] - combLOld[0];

  166. 					combR[1] = combR[0] - combROld[0];

  167. 					combL[2] = combL[1] - combLOld[1];

  168. 					combR[2] = combR[1] - combROld[1];

  169. 					// combL[2] now holds input val

  170. 					// combR[2] now holds input val

  171. 					oldL = valL;

  172. 					oldR = valR;

  173. 					combLOld[0] = combL[0];

  174. 					combROld[0] = combR[0];

  175. 					combLOld[1] = combL[1];

  176. 					combROld[1] = combR[1];

  177. 					for (int j = 0; j < 4; j++) {

  178. 						int32_t integrateL[3];

  179. 						int32_t integrateR[3];

  180. 						static int32_t integrateLOld[3] = {0};

  181. 						static int32_t integrateROld[3] = {0};

  182. 						integrateL[0] = ( (j==0) ? (combL[2]) : (0) ) + integrateLOld[0];

  183. 						integrateR[0] = ( (j==0) ? (combR[2]) : (0) ) + integrateROld[0];

  184. 						integrateL[1] = integrateL[0] + integrateLOld[1];

  185. 						integrateR[1] = integrateR[0] + integrateROld[1];

  186. 						integrateL[2] = integrateL[1] + integrateLOld[2];

  187. 						integrateR[2] = integrateR[1] + integrateROld[2];

  188. 						// integrateL[2] now holds j'th upsampled value

  189. 						// integrateR[2] now holds j'th upsampled value

  190. 						*(dest+j*2) = integrateL[2] >> 4;

  191. 						*(dest+j*2+1) = integrateR[2] >> 4;

  192. 						integrateLOld[0] = integrateL[0];

  193. 						integrateROld[0] = integrateR[0];

  194. 						integrateLOld[1] = integrateL[1];

  195. 						integrateROld[1] = integrateR[1];

  196. 						integrateLOld[2] = integrateL[2];

  197. 						integrateROld[2] = integrateR[2];

  198. 					}

  199. 					dest+=8;

  200. 				}

  201. 			#else

  202. 				#error no interpolation method defined for oversampling.

  203. 			#endif //defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  204. 		#else

  205. 			memcpy_tointerleaveLR(dest, blockL->data + offsetL, blockR->data + offsetR);

  206. 			offsetL += AUDIO_BLOCK_SAMPLES / 2;

  207. 			offsetR += AUDIO_BLOCK_SAMPLES / 2;

  208. 		#endif //defined(AUDIO_PT8211_OVERSAMPLING)

  209. 

  210. 	} else if (blockL) {

  211. 		#if defined(AUDIO_PT8211_OVERSAMPLING)

  212. 			#if defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  213. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetL++) {

  214. 					int32_t val = blockL->data[offsetL];

  215. 					int32_t n = (oldL+val) >> 1;

  216. 					*(dest+0) = (oldL+n) >> 1;

  217. 					*(dest+1) = 0;

  218. 					*(dest+2) = n;

  219. 					*(dest+3) = 0;

  220. 					*(dest+4) = (n+val) >> 1;

  221. 					*(dest+5) = 0;

  222. 					*(dest+6) = val;

  223. 					*(dest+7) = 0;

  224. 					dest+=8;

  225. 					oldL = val;

  226. 				}

  227. 			#elif defined(AUDIO_PT8211_INTERPOLATION_CIC)

  228. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetL++, offsetR++) {

  229. 					int32_t valL = blockL->data[offsetL];

  230. 

  231. 					int32_t combL[3] = {0};

  232. 					static int32_t combLOld[2] = {0};

  233. 

  234. 					combL[0] = valL - oldL;

  235. 					combL[1] = combL[0] - combLOld[0];

  236. 					combL[2] = combL[1] - combLOld[1];

  237. 					// combL[2] now holds input val

  238. 					combLOld[0] = combL[0];

  239. 					combLOld[1] = combL[1];

  240. 

  241. 					for (int j = 0; j < 4; j++) {

  242. 						int32_t integrateL[3];

  243. 						static int32_t integrateLOld[3] = {0};

  244. 						integrateL[0] = ( (j==0) ? (combL[2]) : (0) ) + integrateLOld[0];

  245. 						integrateL[1] = integrateL[0] + integrateLOld[1];

  246. 						integrateL[2] = integrateL[1] + integrateLOld[2];

  247. 						// integrateL[2] now holds j'th upsampled value

  248. 						*(dest+j*2) = integrateL[2] >> 4;

  249. 						integrateLOld[0] = integrateL[0];

  250. 						integrateLOld[1] = integrateL[1];

  251. 						integrateLOld[2] = integrateL[2];

  252. 					}

  253. 

  254. 					// fill right channel with zeros:

  255. 					*(dest+1) = 0;

  256. 					*(dest+3) = 0;

  257. 					*(dest+5) = 0;

  258. 					*(dest+7) = 0;

  259. 					dest+=8;

  260. 					oldL = valL;

  261. 				}

  262. 			#else

  263. 				#error no interpolation method defined for oversampling.

  264. 			#endif //defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  265. 		#else

  266. 			memcpy_tointerleaveL(dest, blockL->data + offsetL);

  267. 			offsetL += (AUDIO_BLOCK_SAMPLES / 2);

  268. 		#endif //defined(AUDIO_PT8211_OVERSAMPLING)

  269. 	} else if (blockR) {

  270. 		#if defined(AUDIO_PT8211_OVERSAMPLING)

  271. 			#if defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  272. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetR++) {

  273. 					int32_t val = blockR->data[offsetR];

  274. 					int32_t n = (oldR+val) >> 1;

  275. 					*(dest+0) = 0;

  276. 					*(dest+1) = ((oldR+n) >> 1);

  277. 					*(dest+2) = 0;

  278. 					*(dest+3) = n;

  279. 					*(dest+4) = 0;

  280. 					*(dest+5) = ((n+val) >> 1);

  281. 					*(dest+6) = 0;

  282. 					*(dest+7) = val;

  283. 					dest+=8;

  284. 					oldR = val;

  285. 				}

  286. 			#elif defined(AUDIO_PT8211_INTERPOLATION_CIC)

  287. 				for (int i=0; i< AUDIO_BLOCK_SAMPLES / 2; i++, offsetL++, offsetR++) {

  288. 					int32_t valR = blockR->data[offsetR];

  289. 

  290. 					int32_t combR[3] = {0};

  291. 					static int32_t combROld[2] = {0};

  292. 

  293. 					combR[0] = valR - oldR;

  294. 					combR[1] = combR[0] - combROld[0];

  295. 					combR[2] = combR[1] - combROld[1];

  296. 					// combR[2] now holds input val

  297. 					combROld[0] = combR[0];

  298. 					combROld[1] = combR[1];

  299. 

  300. 					for (int j = 0; j < 4; j++) {

  301. 						int32_t integrateR[3];

  302. 						static int32_t integrateROld[3] = {0};

  303. 						integrateR[0] = ( (j==0) ? (combR[2]) : (0) ) + integrateROld[0];

  304. 						integrateR[1] = integrateR[0] + integrateROld[1];

  305. 						integrateR[2] = integrateR[1] + integrateROld[2];

  306. 						// integrateR[2] now holds j'th upsampled value

  307. 						*(dest+j*2+1) = integrateR[2] >> 4;

  308. 						integrateROld[0] = integrateR[0];

  309. 						integrateROld[1] = integrateR[1];

  310. 						integrateROld[2] = integrateR[2];

  311. 					}

  312. 

  313. 					// fill left channel with zeros:

  314. 					*(dest+0) = 0;

  315. 					*(dest+2) = 0;

  316. 					*(dest+4) = 0;

  317. 					*(dest+6) = 0;

  318. 					dest+=8;

  319. 					oldR = valR;

  320. 				}

  321. 			#else

  322. 				#error no interpolation method defined for oversampling.

  323. 			#endif //defined(AUDIO_PT8211_INTERPOLATION_LINEAR)

  324. 		#else

  325. 			memcpy_tointerleaveR(dest, blockR->data + offsetR);

  326. 			offsetR += AUDIO_BLOCK_SAMPLES / 2;

  327. 		#endif //defined(AUDIO_PT8211_OVERSAMPLING)

  328. 	} else {

  329. 		#if defined(AUDIO_PT8211_OVERSAMPLING)

  330. 			memset(dest,0,AUDIO_BLOCK_SAMPLES*8);

  331. 		#else

  332. 			memset(dest,0,AUDIO_BLOCK_SAMPLES*2);

  333. 		#endif

  334. 		return;

  335. 	}

  336. 

  337. 	if (offsetL < AUDIO_BLOCK_SAMPLES) {

  338. 		AudioOutputPT8211::block_left_offset = offsetL;

  339. 	} else {

  340. 		AudioOutputPT8211::block_left_offset = 0;

  341. 		AudioStream::release(blockL);

  342. 		AudioOutputPT8211::block_left_1st = AudioOutputPT8211::block_left_2nd;

  343. 		AudioOutputPT8211::block_left_2nd = NULL;

  344. 	}

  345. 	if (offsetR < AUDIO_BLOCK_SAMPLES) {

  346. 		AudioOutputPT8211::block_right_offset = offsetR;

  347. 	} else {

  348. 		AudioOutputPT8211::block_right_offset = 0;

  349. 		AudioStream::release(blockR);

  350. 		AudioOutputPT8211::block_right_1st = AudioOutputPT8211::block_right_2nd;

  351. 		AudioOutputPT8211::block_right_2nd = NULL;

  352. 	}

  353. }

  354. 

  355. 

  356. 

  357. void AudioOutputPT8211::update(void)

  358. {

  359. 

  360. 	audio_block_t *block;

  361. 	block = receiveReadOnly(0); // input 0 = left channel

  362. 	if (block) {

  363. 		__disable_irq();

  364. 		if (block_left_1st == NULL) {

  365. 			block_left_1st = block;

  366. 			block_left_offset = 0;

  367. 			__enable_irq();

  368. 		} else if (block_left_2nd == NULL) {

  369. 			block_left_2nd = block;

  370. 			__enable_irq();

  371. 		} else {

  372. 			audio_block_t *tmp = block_left_1st;

  373. 			block_left_1st = block_left_2nd;

  374. 			block_left_2nd = block;

  375. 			block_left_offset = 0;

  376. 			__enable_irq();

  377. 			release(tmp);

  378. 		}

  379. 	}

  380. 	block = receiveReadOnly(1); // input 1 = right channel

  381. 	if (block) {

  382. 		__disable_irq();

  383. 		if (block_right_1st == NULL) {

  384. 			block_right_1st = block;

  385. 			block_right_offset = 0;

  386. 			__enable_irq();

  387. 		} else if (block_right_2nd == NULL) {

  388. 			block_right_2nd = block;

  389. 			__enable_irq();

  390. 		} else {

  391. 			audio_block_t *tmp = block_right_1st;

  392. 			block_right_1st = block_right_2nd;

  393. 			block_right_2nd = block;

  394. 			block_right_offset = 0;

  395. 			__enable_irq();

  396. 			release(tmp);

  397. 		}

  398. 	}

  399. }

  400. 

  401. #if defined(KINETISK)

  402. // MCLK needs to be 48e6 / 1088 * 256 = 11.29411765 MHz -> 44.117647 kHz sample rate

  403. //

  404. #if F_CPU == 96000000 || F_CPU == 48000000 || F_CPU == 24000000

  405.   // PLL is at 96 MHz in these modes

  406.   #define MCLK_MULT 2

  407.   #define MCLK_DIV  17

  408. #elif F_CPU == 72000000

  409.   #define MCLK_MULT 8

  410.   #define MCLK_DIV  51

  411. #elif F_CPU == 120000000

  412.   #define MCLK_MULT 8

  413.   #define MCLK_DIV  85

  414. #elif F_CPU == 144000000

  415.   #define MCLK_MULT 4

  416.   #define MCLK_DIV  51

  417. #elif F_CPU == 168000000

  418.   #define MCLK_MULT 8

  419.   #define MCLK_DIV  119

  420. #elif F_CPU == 180000000

  421.   #define MCLK_MULT 16

  422.   #define MCLK_DIV  255

  423.   #define MCLK_SRC  0

  424. #elif F_CPU == 192000000

  425.   #define MCLK_MULT 1

  426.   #define MCLK_DIV  17

  427. #elif F_CPU == 216000000

  428.   #define MCLK_MULT 8

  429.   #define MCLK_DIV  153

  430.   #define MCLK_SRC  0

  431. #elif F_CPU == 240000000

  432.   #define MCLK_MULT 4

  433.   #define MCLK_DIV  85

  434. #elif F_CPU == 16000000

  435.   #define MCLK_MULT 12

  436.   #define MCLK_DIV  17

  437. #else

  438.   #error "This CPU Clock Speed is not supported by the Audio library";

  439. #endif

  440. 

  441. #ifndef MCLK_SRC

  442. #if F_CPU >= 20000000

  443.   #define MCLK_SRC  3  // the PLL

  444. #else

  445.   #define MCLK_SRC  0  // system clock

  446. #endif

  447. #endif

  448. #endif

  449. 

  450. void AudioOutputPT8211::config_i2s(void)

  451. {

  452. #if defined(KINETISK)

  453. 	SIM_SCGC6 |= SIM_SCGC6_I2S;

  454. 	SIM_SCGC7 |= SIM_SCGC7_DMA;

  455. 	SIM_SCGC6 |= SIM_SCGC6_DMAMUX;

  456. 

  457. 	// if transmitter is enabled, do nothing

  458. 	if (I2S0_TCSR & I2S_TCSR_TE) return;

  459. 

  460. 

  461. 	// enable MCLK output

  462. 	I2S0_MCR = I2S_MCR_MICS(MCLK_SRC) | I2S_MCR_MOE;

  463. 	while (I2S0_MCR & I2S_MCR_DUF) ;

  464. 	I2S0_MDR = I2S_MDR_FRACT((MCLK_MULT-1)) | I2S_MDR_DIVIDE((MCLK_DIV-1));

  465. 

  466. 	// configure transmitter

  467. 	I2S0_TMR = 0;

  468. 	I2S0_TCR1 = I2S_TCR1_TFW(1);  // watermark at half fifo size

  469. 	#if defined(AUDIO_PT8211_OVERSAMPLING)

  470. 		I2S0_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_BCP | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(0);

  471. 	#else

  472. 		I2S0_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_BCP | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(3);

  473. 	#endif

  474. 	I2S0_TCR3 = I2S_TCR3_TCE;

  475. //	I2S0_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF | I2S_TCR4_FSE | I2S_TCR4_FSP | I2S_TCR4_FSD; //TDA1543

  476. 	I2S0_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF /*| I2S_TCR4_FSE*/ | I2S_TCR4_FSP | I2S_TCR4_FSD; //PT8211

  477. 	I2S0_TCR5 = I2S_TCR5_WNW(15) | I2S_TCR5_W0W(15) | I2S_TCR5_FBT(15);

  478. 

  479. 	// configure pin mux for 3 clock signals

  480. 	CORE_PIN23_CONFIG = PORT_PCR_MUX(6); // pin 23, PTC2, I2S0_TX_FS (LRCLK)

  481. 	CORE_PIN9_CONFIG  = PORT_PCR_MUX(6); // pin  9, PTC3, I2S0_TX_BCLK

  482. 	//CORE_PIN11_CONFIG = PORT_PCR_MUX(6); // pin 11, PTC6, I2S0_MCLK

  483. 	

  484. #elif ( defined(__IMXRT1052__) || defined(__IMXRT1062__) )

  485. 

  486. 	CCM_CCGR5 |= CCM_CCGR5_SAI1(CCM_CCGR_ON);

  487. //PLL:

  488. 	int fs = AUDIO_SAMPLE_RATE_EXACT;

  489. 	// PLL between 27*24 = 648MHz und 54*24=1296MHz

  490. 	int n1 = 4; //SAI prescaler 4 => (n1*n2) = multiple of 4

  491. 	int n2 = 1 + (24000000 * 27) / (fs * 256 * n1);

  492. 

  493. 	double C = ((double)fs * 256 * n1 * n2) / 24000000;

  494. 	int c0 = C;

  495. 	int c2 = 10000;

  496. 	int c1 = C * c2 - (c0 * c2);

  497. 	set_audioClock(c0, c1, c2);

  498. 

  499. 	// clear SAI1_CLK register locations

  500. 	CCM_CSCMR1 = (CCM_CSCMR1 & ~(CCM_CSCMR1_SAI1_CLK_SEL_MASK))

  501. 		   | CCM_CSCMR1_SAI1_CLK_SEL(2); // &0x03 // (0,1,2): PLL3PFD0, PLL5, PLL4

  502. 	CCM_CS1CDR = (CCM_CS1CDR & ~(CCM_CS1CDR_SAI1_CLK_PRED_MASK | CCM_CS1CDR_SAI1_CLK_PODF_MASK))

  503. 		   | CCM_CS1CDR_SAI1_CLK_PRED(n1-1) // &0x07

  504. 		   | CCM_CS1CDR_SAI1_CLK_PODF(n2-1); // &0x3f

  505. 

  506. 	IOMUXC_GPR_GPR1 = (IOMUXC_GPR_GPR1 & ~(IOMUXC_GPR_GPR1_SAI1_MCLK1_SEL_MASK))

  507. 			| (IOMUXC_GPR_GPR1_SAI1_MCLK_DIR | IOMUXC_GPR_GPR1_SAI1_MCLK1_SEL(0));	//Select MCLK

  508. 

  509. 	if (I2S1_TCSR & I2S_TCSR_TE) return;

  510. 

  511. //	CORE_PIN23_CONFIG = 3;  //1:MCLK

  512. 	CORE_PIN21_CONFIG = 3;  //1:RX_BCLK

  513. 	CORE_PIN20_CONFIG = 3;  //1:RX_SYNC

  514. //	CORE_PIN6_CONFIG  = 3;  //1:TX_DATA0

  515. //	CORE_PIN7_CONFIG  = 3;  //1:RX_DATA0

  516. 

  517. 	int rsync = 0;

  518. 	int tsync = 1;

  519. 	#if defined(AUDIO_PT8211_OVERSAMPLING)

  520. 	int div = 0;

  521. 	#else

  522. 	int div = 3;

  523. 	#endif

  524. 	// configure transmitter

  525. 	I2S1_TMR = 0;

  526. 	I2S1_TCR1 = I2S_TCR1_RFW(0);

  527. 	I2S1_TCR2 = I2S_TCR2_SYNC(tsync) | I2S_TCR2_BCP | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(div);

  528. 	I2S1_TCR3 = I2S_TCR3_TCE;

  529. //	I2S1_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF | I2S_TCR4_FSE | I2S_TCR4_FSP | I2S_TCR4_FSD; //TDA1543

  530. 	I2S1_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF /*| I2S_TCR4_FSE*/ | I2S_TCR4_FSP | I2S_TCR4_FSD; //PT8211

  531. 	I2S1_TCR5 = I2S_TCR5_WNW(15) | I2S_TCR5_W0W(15) | I2S_TCR5_FBT(15);

  532. 

  533. 	I2S1_RMR = 0;

  534. 	//I2S1_RCSR = (1<<25); //Reset

  535. 	I2S1_RCR1 = I2S_RCR1_RFW(0);

  536. 	I2S1_RCR2 = I2S_RCR2_SYNC(rsync) | I2S_RCR2_BCP | I2S_RCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(div);

  537. 	I2S1_RCR3 = I2S_RCR3_RCE;

  538. //	I2S1_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF | I2S_TCR4_FSE | I2S_TCR4_FSP | I2S_TCR4_FSD; //TDA1543	

  539. 	I2S1_RCR4 = I2S_RCR4_FRSZ(1) | I2S_RCR4_SYWD(15) | I2S_RCR4_MF /*| I2S_RCR4_FSE*/ | I2S_RCR4_FSP | I2S_RCR4_FSD; //PT8211

  540. 	I2S1_RCR5 = I2S_RCR5_WNW(15) | I2S_RCR5_W0W(15) | I2S_RCR5_FBT(15);

  541. 

  542. #endif

  543. }