--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Low-level I2S module for ARM (interface).
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include <cpu/detect.h>
+
+#if CPU_CM3_SAM3X
+ #include "i2s_sam3.h"
+/*#elif Add other ARM families here */
+#else
+ #error Unknown CPU
+#endif
*/
-/*
- * TODO: Revise the public api of this module to be more generic. Evalutate to
- * implement the more generic layer to be common to all I2S BeRTOS drivers.
- */
-#include "i2s_sam3.h"
#include "cfg/cfg_i2s.h"
// Define log settings for cfg/log.h.
#include <cfg/log.h>
#include <drv/timer.h>
-#include <drv/irq_cm3.h>
-
+#include <drv/i2s.h>
#include <cpu/irq.h>
#include <io/cm3.h>
+struct I2sHardware
+{
+};
+struct I2sHardware i2s_hw;
-#define DATALEN (15 & SSC_DATLEN_MASK)
-#define BITS_PER_CHANNEL 16
-#define N_OF_CHANNEL 2
-// TODO: check the computed value?
-/* The last parameter (2) is due to the hadware on at91sam7s. */
-#define MCK_DIV (CPU_FREQ / (44100 * BITS_PER_CHANNEL * N_OF_CHANNEL* 2))
-#define CONFIG_DELAY 0
-#define CONFIG_PERIOD 15
-#define CONFIG_DATNB 1
-#define CONFIG_FSLEN 15
+/* We divite for 2 because the min clock for i2s i MCLK/2 */
+#define MCK_DIV (CPU_FREQ / (48000 * CONFIG_WORD_BIT_SIZE * CONFIG_CHANNEL_NUM * 2))
+#define DATALEN ((CONFIG_WORD_BIT_SIZE - 1) & SSC_DATLEN_MASK)
+#define DELAY ((CONFIG_DELAY << SSC_STTDLY_SHIFT) & SSC_STTDLY_MASK)
+#define PERIOD ((CONFIG_PERIOD << (SSC_PERIOD_SHIFT)) & SSC_PERIOD_MASK)
+#define DATNB ((CONFIG_WORD_PER_FRAME << SSC_DATNB_SHIFT) & SSC_DATNB_MASK)
+#define FSLEN ((CONFIG_FRAME_SYNC_SIZE << SSC_FSLEN_SHIFT) & SSC_FSLEN_MASK)
+#define EXTRA_FSLEN (CONFIG_EXTRA_FRAME_SYNC_SIZE << SSC_FSLEN_EXT)
-#define DELAY ((CONFIG_DELAY << SSC_STTDLY_SHIFT) & SSC_STTDLY_MASK)
-#define PERIOD ((CONFIG_PERIOD << (SSC_PERIOD_SHIFT)) & SSC_PERIOD_MASK)
-#define DATNB ((CONFIG_DATNB << SSC_DATNB_SHIFT) & SSC_DATNB_MASK)
-#define FSLEN ((CONFIG_FSLEN << SSC_FSLEN_SHIFT) & SSC_FSLEN_MASK)
+static void sam3_i2s_txStop(I2s *i2s)
+{
+ (void)i2s;
+ SSC_CR = BV(SSC_TXDIS);
+}
+static void sam3_i2s_txWait(I2s *i2s)
+{
+ (void)i2s;
+}
+static void sam3_i2s_txStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
+{
+ (void)i2s;
+ (void)buf;
+ (void)len;
+ (void)slice_len;
+}
-void i2s_stop(void)
+static void sam3_i2s_rxStop(I2s *i2s)
{
+ (void)i2s;
SSC_CR = BV(SSC_TXDIS);
}
+static void sam3_i2s_rxWait(I2s *i2s)
+{
+ (void)i2s;
+}
-bool i2s_start(void)
+static void sam3_i2s_rxStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
{
+ (void)i2s;
+ (void)buf;
+ (void)len;
+ (void)slice_len;
+}
- /* enable output */
- SSC_CR = BV(SSC_TXEN);
- return true;
+static bool sam3_i2s_isTxFinish(struct I2s *i2s)
+{
+ (void)i2s;
+ return false;
}
+static bool sam3_i2s_isRxFinish(struct I2s *i2s)
+{
+ (void)i2s;
+ return false;
+}
-static DECLARE_ISR(irq_ssc)
+static void sam3_i2s_txBuf(struct I2s *i2s, void *buf, size_t len)
{
+ (void)i2s;
+ (void)buf;
+ (void)len;
}
-void i2s_init(void)
+static void sam3_i2s_rxBuf(struct I2s *i2s, void *buf, size_t len)
{
+ (void)i2s;
+ (void)buf;
+ (void)len;
+}
+
+static int sam3_i2s_write(struct I2s *i2s, uint32_t sample)
+{
+ (void)i2s;
+ while(!(SSC_SR & BV(SSC_TXRDY)));
+ SSC_THR = sample;
+ return 0;
+}
+
+
+
+static uint32_t sam3_i2s_read(struct I2s *i2s)
+{
+ (void)i2s;
+ while(!(SSC_SR & BV(SSC_RXRDY)));
+ return SSC_RHR;
+}
+
+/*
+static DECLARE_ISR(irq_ssc)
+{
+}
+*/
+void i2s_init(I2s *i2s, int channel)
+{
+ (void)channel;
+ i2s->ctx.write = sam3_i2s_write;
+ i2s->ctx.tx_buf = sam3_i2s_txBuf;
+ i2s->ctx.tx_isFinish = sam3_i2s_isTxFinish;
+ i2s->ctx.tx_start = sam3_i2s_txStart;
+ i2s->ctx.tx_wait = sam3_i2s_txWait;
+ i2s->ctx.tx_stop = sam3_i2s_txStop;
+
+ i2s->ctx.read = sam3_i2s_read;
+ i2s->ctx.rx_buf = sam3_i2s_rxBuf;
+ i2s->ctx.rx_isFinish = sam3_i2s_isRxFinish;
+ i2s->ctx.rx_start = sam3_i2s_rxStart;
+ i2s->ctx.rx_wait = sam3_i2s_rxWait;
+ i2s->ctx.rx_stop = sam3_i2s_rxStop;
+
+ DB(i2s->ctx._type = I2S_SAM3X;)
+ i2s->hw = &i2s_hw;
+
PIOA_PDR = BV(SSC_TK) | BV(SSC_TF) | BV(SSC_TD);
PIO_PERIPH_SEL(SSC_PORT, BV(SSC_TK) | BV(SSC_TF) | BV(SSC_TD), PIO_PERIPH_B);
+
+ /* clock the ssc */
pmc_periphEnable(SSC_ID);
/* reset device */
* - MSB
* - Frame sync output selection negative
*/
- SSC_TFMR = DATALEN | DATNB | FSLEN | BV(SSC_MSBF) | SSC_FSOS_POSITIVE;
+ SSC_TFMR = DATALEN | DATNB | FSLEN | EXTRA_FSLEN | BV(SSC_MSBF) | SSC_FSOS_POSITIVE;
+
+ SSC_IDR = 0xFFFFFFFF;
+ SSC_CR = BV(SSC_TXEN) | BV(SSC_RXEN);
}
*
* \brief I2S driver functions.
*
- * This driver uses a double buffering technique to keep i2s bus busy. First fill in the two buffers
- * using i2s_getBuffer(), then start audio playing with i2s_start(). Then call i2s_getFreeBuffer()
- * until you have finished your samples. The reproduction will automatically stop if you don't
- * call i2s_getFreeBuffer() frequently enough.
- *
- * Example:
- * \code
- * // fill in the buffers before start
- * buf = i2s_getBuffer(I2S_FIRST_BUF);
- * // ...
- * buf = i2s_getBuffer(I2S_SECOND_BUF);
- * // ...
- * // here the driver will play only the first two buffers...
- * i2s_start();
- * // ...call getFreeBuffer() to continue playing.
- * while (!(buf = i2s_getFreeBuffer()))
- * ;
- * // now fill the buffer again
- * \endcode
- *
* \author Daniele Basile <asterix@develer.com>
- *
- * $WIZ$ module_name = "i2s"
- * $WIZ$ module_configuration = "bertos/cfg/cfg_i2s.h"
- * $WIZ$ module_supports = "sam3"
*/
#ifndef DRV_I2S_SAM3_H
#define DRV_I2S_SAM3_H
-
-#include <cfg/compiler.h>
-#include <cfg/macros.h>
#include <io/cm3.h>
-/**
- * First buffer.
- */
-#define I2S_FIRST_BUF 0
-/**
- * Second buffer.
- */
-#define I2S_SECOND_BUF 1
-
-/**
- * Initializes the module and sets current buffer to I2S_FIRST_BUF.
- */
-void i2s_init(void);
-
-/**
- * Returns one of the two buffers or NULL if none is available.
- *
- * You can't call this function if you have already started the player.
- * \param buf_num The number of the buffer, ie I2S_FIRST_BUF or I2S_SECOND_BUF.
- * \return A pointer to the buffer if the buffer is available (not full), 0 on errors
- */
-uint8_t *i2s_getBuffer(unsigned buf_num);
+enum
+{
+ SSC0,
-/**
- * Returns a buffer that will be played after the current one.
- *
- * You should fill it faster than your reproduction time. You can't call this function
- * if the player is not running
- * \return The next buffer to be played, 0 if both are busy.
- */
-uint8_t *i2s_getFreeBuffer(void);
+ SSC_CNT
+};
-/**
- * Starts playing from I2S_FIRST_BUFFER.
- *
- * You must have filled both buffers before calling this function. Does nothing if already playing.
- * \return false on errors, true otherwise.
- */
-bool i2s_start(void);
-void i2s_stop(void);
-INLINE bool i2s_isPlaying(void)
-{
- return !(SSC_SR & BV(SSC_TXEMPTY));
-}
+#define I2S_SAM3X MAKE_ID('I', '2', 'S', '3')
#endif /* DRV_I2S_SAM3_H */
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