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29 * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
32 * \brief I2S driver implementation.
34 * \author Daniele Basile <asterix@develer.com>
39 #include "hw/hw_i2s.h"
41 #include "cfg/cfg_i2s.h"
43 // Define log settings for cfg/log.h.
44 #define LOG_LEVEL I2S_LOG_LEVEL
45 #define LOG_FORMAT I2S_LOG_FORMAT
48 #include <drv/timer.h>
50 #include <drv/dmac_sam3.h>
52 #include <mware/event.h>
63 #define I2S_CACHED_CHUNK_SIZE 2
65 #define I2S_TX_DMAC_CFG (BV(DMAC_CFG_DST_H2SEL) | \
67 ((3 << DMAC_CFG_DST_PER_SHIFT) & DMAC_CFG_DST_PER_MASK) | \
68 (4 & DMAC_CFG_SRC_PER_MASK))
70 #define I2S_TX_DMAC_CTRLA (DMAC_CTRLA_SRC_WIDTH_HALF_WORD | \
71 DMAC_CTRLA_DST_WIDTH_HALF_WORD)
73 #define I2S_TX_DMAC_CTRLB (DMAC_CTRLB_FC_MEM2PER_DMA_FC | \
74 DMAC_CTRLB_DST_INCR_FIXED | \
75 DMAC_CTRLB_SRC_INCR_INCREMENTING)
77 #define I2S_RX_DMAC_CFG (BV(DMAC_CFG_SRC_H2SEL) | \
79 ((4 << DMAC_CFG_DST_PER_SHIFT) & DMAC_CFG_DST_PER_MASK) | \
80 (4 & DMAC_CFG_SRC_PER_MASK))
82 #define I2S_RX_DMAC_CTRLA (DMAC_CTRLA_SRC_WIDTH_HALF_WORD | \
83 DMAC_CTRLA_DST_WIDTH_HALF_WORD)
85 #define I2S_RX_DMAC_CTRLB (DMAC_CTRLB_FC_PER2MEM_DMA_FC | \
86 DMAC_CTRLB_DST_INCR_INCREMENTING | \
87 DMAC_CTRLB_SRC_INCR_FIXED)
91 #define I2S_STATUS_ERR BV(0)
92 #define I2S_STATUS_SINGLE_TRASF BV(1)
93 #define I2S_STATUS_TX BV(2)
94 #define I2S_STATUS_RX BV(3)
100 struct I2sHardware i2s_hw;
101 static Event data_ready;
109 static uint8_t i2s_status;
110 static int16_t *sample_buff;
111 static size_t next_idx = 0;
112 static size_t chunk_size = 0;
113 static size_t remaing_size = 0;
114 static size_t transfer_size = 0;
116 static void sam3_i2s_txStop(I2s *i2s)
119 SSC_CR = BV(SSC_TXDIS);
120 dmac_stop(I2S_DMAC_CH);
127 i2s_status &= ~I2S_STATUS_TX;
129 event_do(&data_ready);
132 static void sam3_i2s_txWait(I2s *i2s)
135 event_wait(&data_ready);
138 static void i2s_dmac_irq(uint32_t status)
141 if (i2s_status & I2S_STATUS_SINGLE_TRASF)
143 i2s_status &= ~I2S_STATUS_SINGLE_TRASF;
147 if (status & (BV(I2S_DMAC_CH) << DMAC_EBCIDR_ERR0))
149 i2s_status |= I2S_STATUS_ERR;
150 // Disable to reset channel and clear fifo
151 dmac_stop(I2S_DMAC_CH);
159 if (i2s_status & I2S_STATUS_TX)
161 curr->src_addr = (uint32_t)&sample_buff[next_idx];
162 curr->dst_addr = (uint32_t)&SSC_THR;
163 curr->dsc_addr = (uint32_t)next;
164 curr->ctrla = I2S_TX_DMAC_CTRLA | (chunk_size & 0xffff);
165 curr->ctrlb = I2S_TX_DMAC_CTRLB & ~BV(DMAC_CTRLB_IEN);
169 curr->src_addr = (uint32_t)&SSC_RHR;
170 curr->dst_addr = (uint32_t)&sample_buff[next_idx];
171 curr->dsc_addr = (uint32_t)next;
172 curr->ctrla = I2S_RX_DMAC_CTRLA | (chunk_size & 0xffff);
173 curr->ctrlb = I2S_RX_DMAC_CTRLB & ~BV(DMAC_CTRLB_IEN);
176 remaing_size -= chunk_size;
177 next_idx += chunk_size;
179 if (remaing_size <= 0)
181 remaing_size = transfer_size;
186 event_do(&data_ready);
191 static void sam3_i2s_txStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
194 ASSERT(len >= slice_len);
195 ASSERT(!(len % slice_len));
197 i2s->hw->end = false;
198 i2s_status &= ~I2S_STATUS_SINGLE_TRASF;
200 sample_buff = (int16_t *)buf;
202 chunk_size = slice_len / 2;
203 remaing_size = len / 2;
204 transfer_size = len / 2;
207 memset(&lli0, 0, sizeof(DmacDesc));
208 memset(&lli1, 0, sizeof(DmacDesc));
214 for (int i = 0; i < I2S_CACHED_CHUNK_SIZE; i++)
220 i2s->ctx.tx_callback(i2s, &sample_buff[next_idx], chunk_size * 2);
222 curr->src_addr = (uint32_t)&sample_buff[next_idx];
223 curr->dst_addr = (uint32_t)&SSC_THR;
224 curr->dsc_addr = (uint32_t)next;
225 curr->ctrla = I2S_TX_DMAC_CTRLA | (chunk_size & 0xffff);
226 curr->ctrlb = I2S_TX_DMAC_CTRLB & ~BV(DMAC_CTRLB_IEN);
228 remaing_size -= chunk_size;
229 next_idx += chunk_size;
231 if (chunk_size > remaing_size)
236 dmac_setLLITransfer(I2S_DMAC_CH, prev, I2S_TX_DMAC_CFG);
238 if (dmac_start(I2S_DMAC_CH) < 0)
240 LOG_ERR("DMAC start[%x]\n", dmac_error(I2S_DMAC_CH));
244 i2s_status &= ~I2S_STATUS_ERR;
245 i2s_status |= I2S_STATUS_TX;
247 SSC_CR = BV(SSC_TXEN);
252 event_wait(&data_ready);
253 if (i2s_status & I2S_STATUS_ERR)
255 LOG_ERR("Error while streaming.\n");
261 LOG_INFO("Stop streaming.\n");
265 i2s->ctx.tx_callback(i2s, &sample_buff[next_idx], chunk_size * 2);
270 static void sam3_i2s_rxStop(I2s *i2s)
273 SSC_CR = BV(SSC_RXDIS) | BV(SSC_TXDIS);
274 dmac_stop(I2S_DMAC_CH);
281 i2s_status &= ~I2S_STATUS_RX;
283 event_do(&data_ready);
286 static void sam3_i2s_rxWait(I2s *i2s)
289 event_wait(&data_ready);
292 static void sam3_i2s_rxStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
295 ASSERT(len >= slice_len);
296 ASSERT(!(len % slice_len));
298 i2s->hw->end = false;
299 i2s_status &= ~I2S_STATUS_SINGLE_TRASF;
301 sample_buff = (int16_t *)buf;
303 chunk_size = slice_len / 2;
304 remaing_size = len / 2;
305 transfer_size = len / 2;
307 memset(&lli0, 0, sizeof(DmacDesc));
308 memset(&lli1, 0, sizeof(DmacDesc));
314 for (int i = 0; i < I2S_CACHED_CHUNK_SIZE; i++)
320 i2s->ctx.rx_callback(i2s, &sample_buff[next_idx], chunk_size * 2);
321 curr->src_addr = (uint32_t)&SSC_RHR;
322 curr->dst_addr = (uint32_t)&sample_buff[next_idx];
323 curr->dsc_addr = (uint32_t)next;
324 curr->ctrla = I2S_RX_DMAC_CTRLA | (chunk_size & 0xffff);
325 curr->ctrlb = I2S_RX_DMAC_CTRLB & ~BV(DMAC_CTRLB_IEN);
327 remaing_size -= chunk_size;
328 next_idx += chunk_size;
330 if (chunk_size > remaing_size)
334 dmac_setLLITransfer(I2S_DMAC_CH, prev, I2S_RX_DMAC_CFG);
336 if (dmac_start(I2S_DMAC_CH) < 0)
338 LOG_ERR("DMAC start[%x]\n", dmac_error(I2S_DMAC_CH));
342 i2s_status &= ~I2S_STATUS_ERR;
343 i2s_status |= I2S_STATUS_RX;
345 SSC_CR = BV(SSC_RXEN) | BV(SSC_TXEN);
350 event_wait(&data_ready);
351 if (i2s_status & I2S_STATUS_ERR)
353 LOG_ERR("Error while streaming.\n");
359 LOG_INFO("Stop streaming.\n");
362 i2s->ctx.rx_callback(i2s, &sample_buff[next_idx], chunk_size * 2);
368 static bool sam3_i2s_isTxFinish(struct I2s *i2s)
373 static bool sam3_i2s_isRxFinish(struct I2s *i2s)
378 static void sam3_i2s_txBuf(struct I2s *i2s, void *buf, size_t len)
381 i2s_status |= I2S_STATUS_SINGLE_TRASF;
383 dmac_setSources(I2S_DMAC_CH, (uint32_t)buf, (uint32_t)&SSC_THR);
384 dmac_configureDmac(I2S_DMAC_CH, len, I2S_TX_DMAC_CFG, I2S_TX_DMAC_CTRLA, I2S_TX_DMAC_CTRLB);
385 dmac_start(I2S_DMAC_CH);
387 SSC_CR = BV(SSC_TXEN);
390 static void sam3_i2s_rxBuf(struct I2s *i2s, void *buf, size_t len)
394 i2s_status |= I2S_STATUS_SINGLE_TRASF;
396 dmac_setSources(I2S_DMAC_CH, (uint32_t)&SSC_RHR, (uint32_t)buf);
397 dmac_configureDmac(I2S_DMAC_CH, len, I2S_RX_DMAC_CFG, I2S_RX_DMAC_CTRLA, I2S_RX_DMAC_CTRLB);
398 dmac_start(I2S_DMAC_CH);
400 SSC_CR = BV(SSC_RXEN);
403 static int sam3_i2s_write(struct I2s *i2s, uint32_t sample)
407 SSC_CR = BV(SSC_TXEN);
408 while(!(SSC_SR & BV(SSC_TXRDY)))
415 static uint32_t sam3_i2s_read(struct I2s *i2s)
419 SSC_CR = BV(SSC_RXEN);
420 while(!(SSC_SR & BV(SSC_RXRDY)))
427 /* We divite for 2 because the min clock for i2s i MCLK/2 */
428 #define MCK_DIV (CPU_FREQ / (CONFIG_SAMPLE_FREQ * CONFIG_WORD_BIT_SIZE * CONFIG_CHANNEL_NUM * 2))
429 #define DATALEN ((CONFIG_WORD_BIT_SIZE - 1) & SSC_DATLEN_MASK)
430 #define DELAY ((CONFIG_DELAY << SSC_STTDLY_SHIFT) & SSC_STTDLY_MASK)
431 #define PERIOD ((CONFIG_PERIOD << (SSC_PERIOD_SHIFT)) & SSC_PERIOD_MASK)
432 #define DATNB ((CONFIG_WORD_PER_FRAME << SSC_DATNB_SHIFT) & SSC_DATNB_MASK)
433 #define FSLEN ((CONFIG_FRAME_SYNC_SIZE << SSC_FSLEN_SHIFT) & SSC_FSLEN_MASK)
434 #define EXTRA_FSLEN (CONFIG_EXTRA_FRAME_SYNC_SIZE << SSC_FSLEN_EXT)
436 void i2s_init(I2s *i2s, int channel)
439 i2s->ctx.write = sam3_i2s_write;
440 i2s->ctx.tx_buf = sam3_i2s_txBuf;
441 i2s->ctx.tx_isFinish = sam3_i2s_isTxFinish;
442 i2s->ctx.tx_start = sam3_i2s_txStart;
443 i2s->ctx.tx_wait = sam3_i2s_txWait;
444 i2s->ctx.tx_stop = sam3_i2s_txStop;
446 i2s->ctx.read = sam3_i2s_read;
447 i2s->ctx.rx_buf = sam3_i2s_rxBuf;
448 i2s->ctx.rx_isFinish = sam3_i2s_isRxFinish;
449 i2s->ctx.rx_start = sam3_i2s_rxStart;
450 i2s->ctx.rx_wait = sam3_i2s_rxWait;
451 i2s->ctx.rx_stop = sam3_i2s_rxStop;
453 DB(i2s->ctx._type = I2S_SAM3X;)
458 PIOA_PDR = BV(SSC_TK) | BV(SSC_TF) | BV(SSC_TD);
459 PIO_PERIPH_SEL(PIOA_BASE, BV(SSC_TK) | BV(SSC_TF) | BV(SSC_TD), PIO_PERIPH_B);
461 PIOB_PDR = BV(SSC_RD) | BV(SSC_RF);
462 PIO_PERIPH_SEL(PIOB_BASE, BV(SSC_RD) | BV(SSC_RF), PIO_PERIPH_A);
465 pmc_periphEnable(SSC_ID);
468 SSC_CR = BV(SSC_SWRST) | BV(SSC_TXDIS) | BV(SSC_RXDIS);
470 /* Set transmission clock */
471 SSC_CMR = MCK_DIV & SSC_DIV_MASK;
472 /* Set the transmission mode:
473 * - the clk is generate from master clock
474 * - clock only during transfer
475 * - transmit Clock Gating Selection none
476 * - DELAY cycle insert before starting transmission
477 * - generate frame sync each 2*(PERIOD + 1) tramit clock
478 * - Receive start on falling edge RF
480 SSC_TCMR = SSC_CKS_DIV | SSC_CKO_CONT | SSC_CKG_NONE | DELAY | PERIOD | SSC_START_FALL_F;
481 /* Set the transmission frame mode:
482 * - data len DATALEN + 1
483 * - word per frame DATNB + 1
484 * - frame sync len FSLEN + (FSLEN_EXT * 16) + 1
485 * - DELAY cycle insert before starting transmission
487 * - Frame sync output selection negative
489 SSC_TFMR = DATALEN | DATNB | FSLEN | EXTRA_FSLEN | BV(SSC_MSBF) | SSC_FSOS_NEGATIVE;
492 // Receiver should start on TX and take the clock from TK
493 SSC_RCMR = SSC_CKS_CLK | BV(SSC_CKI) | SSC_CKO_CONT | SSC_CKG_NONE | DELAY | PERIOD | SSC_START_TX;
494 SSC_RFMR = DATALEN | DATNB | FSLEN | EXTRA_FSLEN | BV(SSC_MSBF) | SSC_FSOS_NEGATIVE;
497 SSC_IDR = 0xFFFFFFFF;
499 dmac_enableCh(I2S_DMAC_CH, i2s_dmac_irq);
500 event_initGeneric(&data_ready);