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Diffstat (limited to 'basic-ssc-i2s-wm8731-project/main.c')
| -rw-r--r-- | basic-ssc-i2s-wm8731-project/main.c | 538 |
1 files changed, 538 insertions, 0 deletions
diff --git a/basic-ssc-i2s-wm8731-project/main.c b/basic-ssc-i2s-wm8731-project/main.c new file mode 100644 index 0000000..3b1e4b4 --- /dev/null +++ b/basic-ssc-i2s-wm8731-project/main.c @@ -0,0 +1,538 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+
+//-----------------------------------------------------------------------------
+/// \dir "Basic SSC-I2S WM8731 project"
+///
+/// !!!Purpose
+///
+/// This example uses the Synchronous Serial Controller (SSC) of an AT91 microcontroller
+/// to output an audio steam through the on-board WM8731 CODEC.
+///
+///
+/// !!!See
+/// - ssc: SSC driver interface
+///
+/// !!!Description
+///
+/// This program plays a WAV file pre-loaded into the SDcard. The audio stream is sent through
+/// the SSC interface connected to the on-board WM8731, enabling the sound to be audible using a pair of headphones.
+///
+/// Since the WM8731 DAC requires that it be feeded a master clock multiple of the sample rate,
+/// it is difficult to handle any WAV file. As such, this example application is limited to playing files with the following format:
+/// - Format: WAV
+/// - Sample rate: 48 kHz
+///
+/// !!!Usage
+///
+/// -# Build the program and download it inside the evaluation board. Please
+/// refer to the
+/// <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6224.pdf">
+/// SAM-BA User Guide</a>, the
+/// <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6310.pdf">
+/// GNU-Based Software Development</a> application note or to the
+/// <a href="ftp://ftp.iar.se/WWWfiles/arm/Guides/EWARM_UserGuide.ENU.pdf">
+/// IAR EWARM User Guide</a>, depending on your chosen solution.
+/// -# On the computer, open and configure a terminal application
+/// (e.g. HyperTerminal on Microsoft Windows) with these settings:
+/// - 115200 bauds
+/// - 8 bits of data
+/// - No parity
+/// - 1 stop bit
+/// - No flow control
+/// -# Start the application.
+/// -# In the terminal window, the following text should appear:
+/// \code
+/// -- Basic SSC I2S WM8731 Project xxx --
+/// -- AT91xxxxxx-xx
+/// -- Compiled: xxx xx xxxx xx:xx:xx --
+/// Menu :
+/// ------
+/// W: Play the WAV file pre-loaded in SD Card
+/// I: Display the information of the WAV file
+/// \endcode
+/// The user can then choose any of the available options to perform the described action.
+///
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+/// \unit
+///
+/// !Purpose
+///
+/// This file contains all the specific code for the
+/// basic-ssc-i2s-wm8731-project
+///
+/// !Contents
+///
+/// The code can be roughly broken down as follows:
+/// - Enable the clock
+/// - Load WAV file information
+/// - Configure and enable the Codec
+/// - Configure and enable the SSC interrupt
+/// - Play WAV file
+///
+/// Please refer to the list of functions in the #Overview# tab of this unit
+/// for more detailed information.
+//-----------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+#include <board_memories.h>
+#include <pio/pio.h>
+#include <irq/irq.h>
+#include <twi/twid.h>
+#include <twi/twi.h>
+#include <dbgu/dbgu.h>
+#include <ssc/ssc.h>
+#include <codec-wm8731/wm8731.h>
+#include <utility/wav.h>
+#include <utility/assert.h>
+#include <utility/math.h>
+#include <utility/trace.h>
+#include <memories/MEDSdcard.h>
+
+#include "fatfs_config.h"
+#if _FATFS_TINY != 1
+#include <fatfs/src/ff.h>
+#else
+#include <fatfs/src/tff.h>
+#endif
+#include <fatfs/src/ff_util.h>
+
+#include <string.h>
+
+#define AUDIO_USING_DMA
+#if defined (AUDIO_USING_DMA)
+#include <dmad/dmad.h>
+#include <dma/dma.h>
+#endif
+
+//------------------------------------------------------------------------------
+// Local constants
+//------------------------------------------------------------------------------
+
+/// Master clock frequency in Hz
+#define SSC_MCK 49152000
+
+/// Address at which the WAV file is located
+#define WAV_FILE_ADDRESS (0x60000000 + 0x100)//0x8000)
+
+/// Maximum size in bytes of the WAV file.
+#define MAX_WAV_SIZE 0x100000
+
+// TWI clock
+#define TWI_CLOCK 100000
+
+// PMC define
+#define AT91C_CKGR_PLLR AT91C_CKGR_PLLAR
+#define AT91C_PMC_LOCK AT91C_PMC_LOCKA
+
+#define AT91C_CKGR_MUL_SHIFT 16
+#define AT91C_CKGR_OUT_SHIFT 14
+#define AT91C_CKGR_PLLCOUNT_SHIFT 8
+#define AT91C_CKGR_DIV_SHIFT 0
+
+/// Maximum number of LUNs which can be defined.
+/// (Logical drive = physical drive = medium number)
+#define MAX_LUNS 1
+
+/// Available medias.
+Media medias[MAX_LUNS];
+
+#define ID_DRV DRV_MMC
+
+#define SAMPLE_RATE (48000)
+#define SLOT_BY_FRAME (2)
+#define BITS_BY_SLOT (16)
+
+#define AT91C_I2S_MASTER_TX_SETTING(nb_bit_by_slot, nb_slot_by_frame)( +\
+ AT91C_SSC_CKS_DIV +\
+ AT91C_SSC_CKO_CONTINOUS +\
+ AT91C_SSC_START_FALL_RF +\
+ ((1<<16) & AT91C_SSC_STTDLY) +\
+ ((((nb_bit_by_slot*nb_slot_by_frame)/2)-1) <<24))
+
+#define AT91C_I2S_TX_FRAME_SETTING(nb_bit_by_slot, nb_slot_by_frame)( +\
+ (nb_bit_by_slot-1) +\
+ AT91C_SSC_MSBF +\
+ (((nb_slot_by_frame-1)<<8) & AT91C_SSC_DATNB) +\
+ (((nb_bit_by_slot-1)<<16) & AT91C_SSC_FSLEN) +\
+ AT91C_SSC_FSOS_NEGATIVE)
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+/// List of pins to configure.
+static const Pin pins[] = {PINS_TWI0, PINS_SSC_CODEC, PIN_PCK0};
+
+/// Pointer to the playback WAV file header.
+static const WavHeader *userWav = (WavHeader *) (0x60000000);
+
+/// Indicates if the WAV file is currently being played.
+static unsigned char isWavPlaying;
+
+#if defined (AUDIO_USING_DMA)
+/// Number of samples which have already been transmitted.
+static unsigned int transmittedSamples;
+/// Number of samples that have not yet been transmitted.
+static unsigned int remainingSamples;
+#endif
+
+#if _FATFS_TINY == 0
+#define STR_ROOT_DIRECTORY "0:"
+#else
+#define STR_ROOT_DIRECTORY ""
+#endif
+
+#if defined(at91cap9stk)
+#define MCI_ID 1 //no connector for MCIO/SPI0
+#else
+#define MCI_ID 0
+#endif
+
+const char* FileName = STR_ROOT_DIRECTORY "sample.wav";
+
+static Twid twid;
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Display the information of the WAV file (sample rate, stereo/mono and frame
+/// size) on the DBGU.
+//------------------------------------------------------------------------------
+static void DisplayWavInfo(void)
+{
+ printf("%c[2J", 27);
+ printf( " Wave file header information\n\r");
+ printf( "--------------------------------\n\r");
+ printf( " - Chunk ID = 0x%08X\n\r", userWav->chunkID);
+ printf( " - Chunk Size = %d\n\r", userWav->chunkSize);
+ printf( " - Format = 0x%08X\n\r", userWav->format);
+ printf( " - SubChunk ID = 0x%08X\n\r", userWav->subchunk1ID);
+ printf( " - Subchunk1 Size = %d\n\r", userWav->subchunk1Size);
+ printf( " - Audio Format = 0x%04X\n\r", userWav->audioFormat);
+ printf( " - Num. Channels = %d\n\r", userWav->numChannels);
+ printf( " - Sample Rate = %d\n\r", userWav->sampleRate);
+ printf( " - Byte Rate = %d\n\r", userWav->byteRate);
+ printf( " - Block Align = %d\n\r", userWav->blockAlign);
+ printf( " - Bits Per Sample = %d\n\r", userWav->bitsPerSample);
+ printf( " - Subchunk2 ID = 0x%08X\n\r", userWav->subchunk2ID);
+ printf( " - Subchunk2 Size = %d\n\r", userWav->subchunk2Size);
+ printf("Press a key to return to the menu ...\n\r");
+ DBGU_GetChar();
+}
+
+//------------------------------------------------------------------------------
+/// Displays the user menu on the DBGU.
+//------------------------------------------------------------------------------
+static void DisplayMenu(void)
+{
+ printf("%c[2J-- Basic SSC I2S WM8731 Project xxx --\n\r", 27);
+ printf("Menu :\n\r");
+ printf("------\n\r");
+
+ // Play a WAV file pre-loaded in SDCARD using SAM-BA
+ if (!isWavPlaying) {
+
+ printf(" W: Play the WAV file pre-loaded in SDCARD\n\r");
+ }
+
+ // Display the information of the WAV file (sample rate, stereo/mono and frame size)
+ printf(" I: Display the information of the WAV file\n\r");
+
+ // Stop the current playback (if any)
+ if (isWavPlaying) {
+
+ printf(" S: Stop playback\n\r");
+ }
+}
+
+#if defined(AUDIO_USING_DMA)
+void HDMA_IrqHandler(void)
+{
+ unsigned int size;
+ unsigned intFlag;
+
+ // One buffer sent & more buffers to send
+ if (remainingSamples > 0 ) {
+
+ size = min(remainingSamples / (userWav->bitsPerSample / 8), BOARD_SSC_DMA_FIFO_SIZE * MAX_SSC_LLI_SIZE/2);
+ SSC_WriteBuffer(AT91C_BASE_SSC0, (void *) (WAV_FILE_ADDRESS + transmittedSamples), size);
+ remainingSamples -= size * (userWav->bitsPerSample / 8);
+ transmittedSamples += size * (userWav->bitsPerSample / 8);
+ intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8) ;
+ DMA_EnableIt(intFlag);
+ DMA_EnableChannel(BOARD_SSC_DMA_CHANNEL);
+ }
+ else if (remainingSamples == 0){
+ DMA_DisableChannel(BOARD_SSC_DMA_CHANNEL);
+ intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8) ;
+ DMA_DisableIt(intFlag);
+ isWavPlaying = 0;
+ DisplayMenu();
+ }
+
+}
+#endif
+
+//------------------------------------------------------------------------------
+/// Play a WAV file pre-loaded in SDCARD.
+//------------------------------------------------------------------------------
+void PlayLoop(unsigned short *pExtMem, unsigned int numSamples)
+{
+ unsigned int i;
+ for (i = 0; i < numSamples; i++) {
+
+ SSC_Write(AT91C_BASE_SSC0, pExtMem[i]);
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Play a WAV file pre-loaded in SDCARD
+//------------------------------------------------------------------------------
+static void PlayWavFile(void)
+{
+#if !defined(AUDIO_USING_DMA)
+ unsigned int size;
+
+ size = userWav->subchunk2Size > MAX_WAV_SIZE ? MAX_WAV_SIZE : userWav->subchunk2Size;
+ SSC_EnableTransmitter(AT91C_BASE_SSC0);
+ PlayLoop((unsigned short *)WAV_FILE_ADDRESS, size >> 1);
+#else
+ unsigned int size;
+ unsigned int intFlag = 0;
+
+ size = userWav->subchunk2Size > MAX_WAV_SIZE ? MAX_WAV_SIZE : userWav->subchunk2Size;
+ SSC_EnableTransmitter(AT91C_BASE_SSC0);
+
+ // Start transmitting WAV file to SSC
+ remainingSamples = userWav->subchunk2Size;
+ transmittedSamples = 0;
+
+ intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8) ;
+ DMA_DisableIt(intFlag);
+ DMA_DisableChannel(BOARD_SSC_DMA_CHANNEL);
+
+ // Fill DMA buffer
+ size = min(remainingSamples / (userWav->bitsPerSample / 8), BOARD_SSC_DMA_FIFO_SIZE * MAX_SSC_LLI_SIZE/2);
+ SSC_WriteBuffer(AT91C_BASE_SSC0, (void *) (WAV_FILE_ADDRESS + transmittedSamples), size);
+ remainingSamples -= size * (userWav->bitsPerSample / 8);
+ transmittedSamples += size * (userWav->bitsPerSample / 8);
+
+ intFlag = 1 << (BOARD_SSC_DMA_CHANNEL + 8) ;
+ DMA_EnableIt(intFlag);
+ DMA_EnableChannel(BOARD_SSC_DMA_CHANNEL);
+
+#endif
+}
+
+//------------------------------------------------------------------------------
+/// Stop the current playback (if any).
+//------------------------------------------------------------------------------
+static void StopPlayback(void)
+{
+ SSC_DisableTransmitter(AT91C_BASE_SSC0);
+}
+
+//------------------------------------------------------------------------------
+/// Check wav file from sdcard
+//------------------------------------------------------------------------------
+unsigned char CheckWavFile()
+{
+ FRESULT res;
+ FATFS fs; // File system object
+ FIL FileObject;
+
+ unsigned int numRead, pcmSize;
+
+ // Init Disk
+ printf("-I- Init media Sdcard\n\r");
+ MEDSdcard_Initialize(&medias[ID_DRV], MCI_ID);
+
+ // Mount disk
+ printf("-I- Mount disk %d\n\r", ID_DRV);
+ memset(&fs, 0, sizeof(FATFS)); // Clear file system object
+ res = f_mount(ID_DRV, &fs);
+ if( res != FR_OK ) {
+ printf("-E- f_mount pb: 0x%X (%s)\n\r", res, FF_GetStrResult(res));
+ return 0;
+ }
+
+ res = f_open(&FileObject, FileName, FA_OPEN_EXISTING|FA_READ);
+ if (res == FR_OK) {
+ printf("-I- File Found!\n\r");
+ //f_close(&FileObject);
+ // FilePlay();
+ }
+ else {
+ printf("-E- File Not Found!\n\r");
+ return 1;
+ }
+
+ // Read header
+ f_read(&FileObject, (void*)userWav, sizeof(WavHeader), &numRead);
+ DisplayWavInfo();
+
+ // Load PCM
+ pcmSize = userWav->subchunk2Size;
+ if (pcmSize > MAX_WAV_SIZE) {
+ pcmSize = MAX_WAV_SIZE;
+ }
+ f_read(&FileObject, (void*)WAV_FILE_ADDRESS, pcmSize, &numRead);
+ printf("-I- PCM Load to %x, size %d\n\r", WAV_FILE_ADDRESS, numRead);
+ f_close(&FileObject);
+
+ return 0;
+}
+
+//------------------------------------------------------------------------------
+/// Main function
+//------------------------------------------------------------------------------
+int main(void)
+{
+ unsigned char key;
+ unsigned char isValid;
+
+ // Configure all pins
+ PIO_Configure(pins, PIO_LISTSIZE(pins));
+
+ // Initialize the DBGU
+ TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
+
+ // Initialize PSRAM
+ BOARD_ConfigurePsram();
+
+ // Switch to Main clock
+ AT91C_BASE_PMC->PMC_MCKR = (AT91C_BASE_PMC->PMC_MCKR & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+
+ // Configure PLL to 98.285MHz
+ *AT91C_CKGR_PLLR = ((1 << 29) | (171 << AT91C_CKGR_MUL_SHIFT) \
+ | (0x0 << AT91C_CKGR_OUT_SHIFT) |(0x3f << AT91C_CKGR_PLLCOUNT_SHIFT) \
+ | (21 << AT91C_CKGR_DIV_SHIFT));
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK) == 0);
+
+ // Configure master clock in two operations
+ AT91C_BASE_PMC->PMC_MCKR = (( AT91C_PMC_PRES_CLK_2 | AT91C_PMC_CSS_PLLA_CLK) & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_MAIN_CLK;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+ AT91C_BASE_PMC->PMC_MCKR = ( AT91C_PMC_PRES_CLK_2 | AT91C_PMC_CSS_PLLA_CLK);
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) == 0);
+
+ // DBGU reconfiguration
+ DBGU_Configure(DBGU_STANDARD, 115200, SSC_MCK);
+
+ // Configure and enable the TWI (required for accessing the DAC)
+ *AT91C_PMC_PCER = (1<< AT91C_ID_TWI0);
+ TWI_ConfigureMaster(AT91C_BASE_TWI0, TWI_CLOCK, SSC_MCK);
+ TWID_Initialize(&twid, AT91C_BASE_TWI0);
+
+ // Enable the DAC master clock
+ AT91C_BASE_PMC->PMC_PCKR[0] = AT91C_PMC_CSS_PLLA_CLK | AT91C_PMC_PRES_CLK_8;
+ AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_PCK0;
+ while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_PCKRDY0) == 0);
+
+ printf("-- Basic SSC I2S WM8731 Project %s --\n\r", SOFTPACK_VERSION);
+ printf("-- %s\n\r", BOARD_NAME);
+ printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
+
+ // Check and load wav file from sdcard
+ isValid = CheckWavFile();
+ if(isValid) {
+ printf("-E- Open wav file fail!\r\n");
+ return 1;
+ }
+ // Load WAV file information
+ isValid = WAV_IsValid(userWav);
+ ASSERT(isValid, "-F- Invalid WAV file provided\n\r");
+ isWavPlaying = 0;
+
+ // Sample rate must be 48kHz
+ printf("-I- Sample rate = %d Hz\n\r", userWav->sampleRate);
+ ASSERT(userWav->sampleRate == 48000, "-F- The WAV file must have a sample rate of 48kHz\n\r");
+
+ // Initialize the audio DAC
+ WM8731_DAC_Init(&twid, WM8731_SLAVE_ADDRESS);
+
+ // Configure SSC
+ SSC_Configure(AT91C_BASE_SSC0,
+ AT91C_ID_SSC0,
+ SAMPLE_RATE * BITS_BY_SLOT * 2,
+ SSC_MCK);
+ SSC_ConfigureReceiver(AT91C_BASE_SSC0, 0, 0);
+ SSC_ConfigureTransmitter(AT91C_BASE_SSC0,
+ AT91C_I2S_MASTER_TX_SETTING(BITS_BY_SLOT, SLOT_BY_FRAME),
+ AT91C_I2S_TX_FRAME_SETTING( BITS_BY_SLOT, SLOT_BY_FRAME));
+ SSC_DisableTransmitter(AT91C_BASE_SSC0);
+
+#if defined(AUDIO_USING_DMA)
+ // Initialize DMA controller.
+ DMAD_Initialize(BOARD_SSC_DMA_CHANNEL, 0);
+ // Configure and enable the SSC interrupt
+ IRQ_ConfigureIT(AT91C_ID_HDMA, 0, HDMA_IrqHandler);
+ IRQ_EnableIT(AT91C_ID_HDMA);
+#endif
+
+ // Enter menu loop
+ while (1) {
+
+ // Display menu
+ DisplayMenu();
+
+ // Process user input
+ key = DBGU_GetChar();
+
+ // Play WAV file
+ if ((key == 'W') && !isWavPlaying) {
+
+ PlayWavFile();
+ isWavPlaying = 1;
+ }
+ // Display WAV information
+ else if (key == 'I') {
+
+ DisplayWavInfo();
+ }
+ // Stop playback
+ else if ((key == 'S') && isWavPlaying) {
+
+ StopPlayback();
+ isWavPlaying = 0;
+ }
+ }
+}
+
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