/*! \brief The PDCA interrupt handler.
*
* The handler reload the PDCA settings with the correct address and size using the reload register.
* The interrupt will happen when the reload counter reaches 0
*/
__attribute__((__interrupt__)) static void spk_pdca_int_handler(void)
{
if (spk_buffer_out == 0)
{
// Set PDCA channel reload values with address where data to load are stored, and size of the data block to load.
pdca_reload_channel(PDCA_CHANNEL_SSC_TX, (void *)spk_buffer_1, SPK_BUFFER_SIZE);
spk_buffer_out = 1;
}
else
{
pdca_reload_channel(PDCA_CHANNEL_SSC_TX, (void *)spk_buffer_0, SPK_BUFFER_SIZE);
spk_buffer_out = 0;
}
}
/*! \brief The PDCA interrupt handler.
*
* The handler reload the PDCA settings with the correct address and size using the reload register.
* The interrupt will happen when the reload counter reaches 0
*/
__attribute__((__interrupt__)) static void pdca_int_handler(void)
{
if (audio_buffer_in == 0)
{
// Set PDCA channel reload values with address where data to load are stored, and size of the data block to load.
pdca_reload_channel(PDCA_CHANNEL_SSC_RX, (void *)audio_buffer_1, AUDIO_BUFFER_SIZE);
audio_buffer_in = 1;
}
else
{
pdca_reload_channel(PDCA_CHANNEL_SSC_RX, (void *)audio_buffer_0, AUDIO_BUFFER_SIZE);
audio_buffer_in = 0;
}
}
__interrupt
#endif
static void pdca_int_handler(void)
{
u32PdcaIsr = pdca_channel->isr;
if( u32PdcaIsr & (1<<AVR32_PDCA_ISR0_TRC_OFFSET) )
{
// Count the number of Transfer Complete interrupts.
pdca_reload_channel(PDCA_CHANNEL_USART, (void *)aDataTransfered, sizeof( aDataTransfered ));
print_dbg("\r\n");
}
}
/*! \brief Flushes the sample buffer being output to the ABDAC.
*/
void tpa6130_dac_flush(void)
{
pdca_disable_interrupt_transfer_complete(TPA6130_ABDAC_PDCA_CHANNEL);
pdca_disable_interrupt_reload_counter_zero(TPA6130_ABDAC_PDCA_CHANNEL);
/*TODO Do we really want to wait here? Or do we just don't care when
* the buffer is empty/flushed */
//while(!pdca_get_transfer_status(TPA6130_ABDAC_PDCA_CHANNEL) &
// PDCA_TRANSFER_COMPLETE);
pdca_disable (TPA6130_ABDAC_PDCA_CHANNEL );
pdca_load_channel (TPA6130_ABDAC_PDCA_CHANNEL,0x0, 0);
pdca_reload_channel(TPA6130_ABDAC_PDCA_CHANNEL,0x0, 0);
pdca_enable (TPA6130_ABDAC_PDCA_CHANNEL );
}
bool aic23b_adc_input(void *sample_buffer, size_t sample_length)
{
if (!(pdca_get_transfer_status(AIC23B_SSC_RX_PDCA_CHANNEL) &
PDCA_TRANSFER_COUNTER_RELOAD_IS_ZERO))
return false;
if (sample_length)
{
pdca_reload_channel(AIC23B_SSC_RX_PDCA_CHANNEL, sample_buffer, sample_length * 2);
pdca_get_reload_size(AIC23B_SSC_RX_PDCA_CHANNEL);
if (aic23b_output_params.callback_opt & AUDIO_ADC_OUT_OF_SAMPLE_CB)
pdca_enable_interrupt_transfer_complete(AIC23B_SSC_RX_PDCA_CHANNEL);
if (aic23b_output_params.callback_opt & AUDIO_ADC_RELOAD_CB)
pdca_enable_interrupt_reload_counter_zero(AIC23B_SSC_RX_PDCA_CHANNEL);
}
return true;
}
void aic23b_dac_start(uint32_t sample_rate_hz,
uint8_t num_channels,
uint8_t bits_per_sample,
bool swap_channels,
void (*callback)(uint32_t arg),
uint32_t callback_opt,
uint32_t pba_hz)
{
#if AIC23B_CTRL_INTERFACE == AIC23B_CTRL_INTERFACE_SPI
static const spi_options_t AIC23B_SPI_OPTIONS =
{
.reg = AIC23B_SPI_NPCS,
.baudrate = AIC23B_SPI_MASTER_SPEED,
.bits = AIC23B_CTRL_SIZE,
.spck_delay = 0,
.trans_delay = 0,
.stay_act = 0,
.spi_mode = 3,
.modfdis = 1
};
spi_setupChipReg(AIC23B_SPI, &AIC23B_SPI_OPTIONS, pba_hz);
#endif
aic23b_dac_stop();
gpio_enable_module(AIC23B_SSC_DAC_GPIO_MAP,
sizeof(AIC23B_SSC_DAC_GPIO_MAP) / sizeof(AIC23B_SSC_DAC_GPIO_MAP[0]));
aic23b_pdc_t pdc;
pdc.data = AIC23B_DEFAULT(AIC23B_PDC);
pdc.off = 0;
pdc.clk = 0;
pdc.osc = 0;
pdc.out = 0;
pdc.dac = 0;
pdc.adc = 1;
pdc.mic = 1;
pdc.line = 1;
aic23b_set_power_down_state(pdc);
aic23b_dac_setup(sample_rate_hz,
num_channels,
bits_per_sample,
swap_channels,
callback,
callback_opt,
pba_hz);
aic23b_aapc_t aapc;
aapc.data = AIC23B_DEFAULT(AIC23B_AAPC);
aapc.ste = 0;
aapc.dac = 1;
aapc.byp = 0;
aapc.micm = 1;
aapc.micb = 0;
aic23b_set_analog_audio_path(aapc);
aic23b_dapc_t dapc;
dapc.data = AIC23B_DEFAULT(AIC23B_DAPC);
dapc.dacm = 0;
dapc.deemp = AIC23B_DAPC_DEEMP_NONE;
dapc.adchp = 1;
aic23b_set_digital_audio_path(dapc);
// set an acceptable start volume
aic23b_set_headphone_volume(AIC23B_LEFT_CHANNEL | AIC23B_RIGHT_CHANNEL,
-30,
true);
aic23b_activate_dig_audio(true);
INTC_register_interrupt(&aic23b_ssc_tx_pdca_int_handler,
AIC23B_SSC_TX_PDCA_IRQ,
AIC23B_SSC_TX_PDCA_INT_LEVEL);
}
void aic23b_dac_setup(uint32_t sample_rate_hz,
uint8_t num_channels,
uint8_t bits_per_sample,
bool swap_channels,
void (*callback)(uint32_t arg),
uint32_t callback_opt,
uint32_t pba_hz)
{
#if defined(AIC23B_DAC_USE_RX_CLOCK) && AIC23B_DAC_USE_RX_CLOCK == true
#if defined(AIC23B_DAC_RX_CLOCK_SET_CALLBACK)
AIC23B_DAC_RX_CLOCK_SET_CALLBACK(2 * sample_rate_hz *
((bits_per_sample <= 16) ? 16 :
(bits_per_sample <= 20) ? 20 :
(bits_per_sample <= 24) ? 24 :
32));
#endif
ssc_i2s_init(AIC23B_SSC,
sample_rate_hz,
bits_per_sample,
(bits_per_sample <= 16) ? 16 :
(bits_per_sample <= 20) ? 20 :
(bits_per_sample <= 24) ? 24 :
32,
SSC_I2S_MODE_STEREO_OUT_EXT_CLK,
pba_hz);
#else
ssc_i2s_init(AIC23B_SSC,
sample_rate_hz,
bits_per_sample,
(bits_per_sample <= 16) ? 16 :
(bits_per_sample <= 20) ? 20 :
(bits_per_sample <= 24) ? 24 :
32,
SSC_I2S_MODE_STEREO_OUT,
pba_hz);
#endif
pdca_channel_options_t aic23b_ssc_pdca_options =
{
.addr = NULL,
.size = 0,
.r_addr = NULL,
.r_size = 0,
.pid = AIC23B_SSC_TX_PDCA_PID,
.transfer_size = (bits_per_sample <= 8) ? PDCA_TRANSFER_SIZE_BYTE :
(bits_per_sample <= 16) ? PDCA_TRANSFER_SIZE_HALF_WORD :
PDCA_TRANSFER_SIZE_WORD
};
pdca_init_channel(AIC23B_SSC_TX_PDCA_CHANNEL, &aic23b_ssc_pdca_options);
pdca_enable(AIC23B_SSC_TX_PDCA_CHANNEL);
#if !defined(AIC23B_DAC_USE_RX_CLOCK) || AIC23B_DAC_USE_RX_CLOCK == false || \
!defined(AIC23B_DAC_RX_CLOCK_SET_CALLBACK)
// Set DAC frequency
aic23b_configure_freq(AIC23B_MCLK_HZ, sample_rate_hz);
#endif
aic23b_daif_t daif;
daif.data = AIC23B_DEFAULT(AIC23B_DAIF);
daif.ms = AIC23B_DAIF_MS_SLAVE;
daif.lrswap = swap_channels;
daif.lrp = 0;
daif.iwl = (bits_per_sample <= 16) ? AIC23B_DAIF_IWL_16 :
(bits_per_sample <= 20) ? AIC23B_DAIF_IWL_20 :
(bits_per_sample <= 24) ? AIC23B_DAIF_IWL_24 :
AIC23B_DAIF_IWL_32;
daif.fmt = AIC23B_DAIF_FMT_I2S;
aic23b_write_reg(AIC23B_DAIF, daif.data);
aic23b_output_params.num_channels = num_channels;
aic23b_output_params.callback = callback;
aic23b_output_params.callback_opt = callback_opt;
}
#endif
bool aic23b_dac_output(void *sample_buffer, size_t sample_length)
{
bool global_interrupt_enabled;
if (!(pdca_get_transfer_status(AIC23B_SSC_TX_PDCA_CHANNEL) &
PDCA_TRANSFER_COUNTER_RELOAD_IS_ZERO))
return false;
if (sample_length)
{
if (aic23b_output_params.num_channels == 1)
{
int16_t *s16_sample_buffer = sample_buffer;
int i;
for (i = sample_length - 1; i >= 0; i--)
{
s16_sample_buffer[2 * i + 1] =
s16_sample_buffer[2 * i] = s16_sample_buffer[i];
}
}
// The PDCA is not able to synchronize its start of transfer with the SSC
// start of period, so this has to be done by polling the TF pin.
// Not doing so may result in channels being swapped randomly.
if ((global_interrupt_enabled = Is_global_interrupt_enabled()))
Disable_global_interrupt();
if (pdca_get_transfer_status(AIC23B_SSC_TX_PDCA_CHANNEL) &
PDCA_TRANSFER_COMPLETE)
{
while (gpio_get_pin_value(AIC23B_SSC_TX_FRAME_SYNC_PIN));
while (!gpio_get_pin_value(AIC23B_SSC_TX_FRAME_SYNC_PIN));
}
pdca_reload_channel(AIC23B_SSC_TX_PDCA_CHANNEL, sample_buffer, sample_length * 2);
pdca_get_reload_size(AIC23B_SSC_TX_PDCA_CHANNEL);
if (global_interrupt_enabled)
Enable_global_interrupt();
if (aic23b_output_params.callback_opt & AUDIO_DAC_OUT_OF_SAMPLE_CB)
pdca_enable_interrupt_transfer_complete(AIC23B_SSC_TX_PDCA_CHANNEL);
if (aic23b_output_params.callback_opt & AUDIO_DAC_RELOAD_CB)
pdca_enable_interrupt_reload_counter_zero(AIC23B_SSC_TX_PDCA_CHANNEL);
}
return true;
}
/**
* \brief Set a given number of pixels to the same color
*
* Use this function to write a certain number of pixels to the same color
* within a set limit.
*
* Limits have to be set prior to calling this function, e.g.:
* \code
* ili9341_set_top_left_limit(0, 0);
* ili9341_set_bottom_right_limit(320, 240);
* ...
* \endcode
*
* \param color The color to write to the display
* \param count The number of pixels to write with this color
*/
void ili9341_duplicate_pixel(const ili9341_color_t color, uint32_t count)
{
/* Sanity check to make sure that the pixel count is not zero */
Assert(count > 0);
ili9341_send_command(ILI9341_CMD_MEMORY_WRITE);
#if defined(ILI9341_DMA_ENABLED)
ili9341_color_t chunk_buf[ILI9341_DMA_CHUNK_SIZE];
uint32_t chunk_len;
# if SAM
Pdc *SPI_DMA = spi_get_pdc_base(CONF_ILI9341_SPI);
pdc_packet_t spi_pdc_data;
pdc_enable_transfer(SPI_DMA, PERIPH_PTCR_TXTEN);
spi_pdc_data.ul_addr = (uint32_t)chunk_buf;
# elif UC3
pdca_set_transfer_size(CONF_ILI9341_PDCA_CHANNEL,
PDCA_TRANSFER_SIZE_BYTE);
pdca_set_peripheral_select(CONF_ILI9341_PDCA_CHANNEL,
CONF_ILI9341_PDCA_PID);
# endif
for (uint32_t i = 0; i < ILI9341_DMA_CHUNK_SIZE; i++) {
chunk_buf[i] = le16_to_cpu(color);
}
while (count)
{
chunk_len = min(ILI9341_DMA_CHUNK_SIZE, count);
ili9341_wait_for_send_done();
# if SAM
spi_pdc_data.ul_size = (uint32_t)sizeof(ili9341_color_t) * chunk_len;
pdc_tx_init(SPI_DMA, NULL, &spi_pdc_data);
# elif UC3
pdca_reload_channel(CONF_ILI9341_PDCA_CHANNEL, chunk_buf,
(uint32_t)sizeof(ili9341_color_t) * chunk_len);
pdca_enable(CONF_ILI9341_PDCA_CHANNEL);
# endif
count -= chunk_len;
}
ili9341_wait_for_send_done();
ili9341_deselect_chip();
# if SAM
pdc_disable_transfer(SPI_DMA, PERIPH_PTCR_TXTEN);
# elif UC3
pdca_disable(CONF_ILI9341_PDCA_CHANNEL);
# endif
#else
while (count--) {
ili9341_send_byte(color);
ili9341_send_byte(color >> 8);
}
ili9341_wait_for_send_done();
ili9341_deselect_chip();
#endif
}
/**
* \brief Copy pixels from SRAM to the screen
*
* Used to copy a large quantitative of data to the screen in one go.
*
* Limits have to be set prior to calling this function, e.g.:
* \code
* ili9341_set_top_left_limit(0, 0);
* ili9341_set_bottom_right_limit(320, 240);
* ...
* \endcode
*
* \param pixels Pointer to the pixel data
* \param count Number of pixels to copy to the screen
*/
void ili9341_copy_pixels_to_screen(const ili9341_color_t *pixels, uint32_t count)
{
const ili9341_color_t *pixel = pixels;
/* Sanity check to make sure that the pixel count is not zero */
Assert(count > 0);
ili9341_send_command(ILI9341_CMD_MEMORY_WRITE);
#if defined(ILI9341_DMA_ENABLED)
ili9341_color_t chunk_buf[ILI9341_DMA_CHUNK_SIZE];
uint32_t chunk_len;
# if SAM
Pdc *SPI_DMA = spi_get_pdc_base(CONF_ILI9341_SPI);
pdc_packet_t spi_pdc_data;
pdc_enable_transfer(SPI_DMA, PERIPH_PTCR_TXTEN);
spi_pdc_data.ul_addr = (uint32_t)chunk_buf;
# elif UC3
pdca_set_transfer_size(CONF_ILI9341_PDCA_CHANNEL,
PDCA_TRANSFER_SIZE_BYTE);
pdca_set_peripheral_select(CONF_ILI9341_PDCA_CHANNEL,
CONF_ILI9341_PDCA_PID);
# endif
while (count)
{
/* We need to copy out the data to send in chunks into RAM, as the PDC
* does not allow FLASH->Peripheral transfers */
chunk_len = min(ILI9341_DMA_CHUNK_SIZE, count);
/* Wait for pending transfer to complete */
ili9341_wait_for_send_done();
for (uint32_t i = 0; i < chunk_len; i++) {
chunk_buf[i] = le16_to_cpu(pixel[i]);
}
# if SAM
spi_pdc_data.ul_size = (uint32_t)sizeof(ili9341_color_t) * chunk_len;
pdc_tx_init(SPI_DMA, NULL, &spi_pdc_data);
# elif UC3
pdca_reload_channel(CONF_ILI9341_PDCA_CHANNEL, chunk_buf,
(uint32_t)sizeof(ili9341_color_t) * chunk_len);
pdca_enable(CONF_ILI9341_PDCA_CHANNEL);
# endif
pixel += chunk_len;
count -= chunk_len;
}
ili9341_wait_for_send_done();
ili9341_deselect_chip();
# if SAM
pdc_disable_transfer(SPI_DMA, PERIPH_PTCR_TXTEN);
# elif UC3
pdca_disable(CONF_ILI9341_PDCA_CHANNEL);
# endif
#else
while (count--) {
ili9341_send_byte(*pixel);
ili9341_send_byte(*pixel >> 8);
pixel++;
}
ili9341_wait_for_send_done();
ili9341_deselect_chip();
#endif
}
/*! \brief Sets the DACs up with new settings.
*
* \note The DACs must have been started beforehand.
*/
void tpa6130_dac_setup(uint32_t sample_rate_hz,
uint8_t num_channels,
uint8_t bits_per_sample,
bool swap_channels,
void (*callback)(uint32_t arg),
uint32_t callback_opt,
uint32_t pba_hz)
{
// save input parameters to local driver data
tpa6130_output_param.num_channels = num_channels;
tpa6130_output_param.callback = callback;
tpa6130_output_param.callback_opt = callback_opt;
/* Probe for amplifier and initialize it */
tpa6130_init();
#if defined(TPA6130_DAC_CLOCK_SET_CALLBACK)
TPA6130_DAC_CLOCK_SET_CALLBACK(sample_rate_hz);
#else
/* ABDAC configuration
* The ABDAC needs the input frequency of its generic clock (bus_hz)
* Here we use the configuration value from the conf_tpa6130.h file
* (TPA6130_ABDAC_GCLK_INPUT_HZ).
* The sample rate specifies the desired sample rate for the ABDAC.
* The generic clock input must be greater than 256*sample_rate_hz
* or the setup of the ABDAC will fail silently here.
* TODO we could add asserts here to detect wrong settings during
* compile time.
*/
if(!abdac_set_dac_sample_rate(sample_rate_hz)) {
// if it is not possible to set correctly the sample rate
// Use default set function
abdac_set_dac_hz(TPA6130_ABDAC, TPA6130_ABDAC_GCLK_INPUT_HZ,sample_rate_hz);
}
#endif
if(swap_channels)
{
abdac_swap_channels(TPA6130_ABDAC);
}
abdac_enable(TPA6130_ABDAC);
/* PDCA setup */
/*FIXME we use only word as transfer size for now.
* half-word transfer size will only write to channel0
* of the ABDAC, this can be used to implement mono */
pdca_channel_options_t tpa6130_abdac_pdca_options =
{
.addr = NULL,
.size = 0,
.r_addr = 0,
.r_size = 0,
.pid = TPA6130_ABDAC_PDCA_PID,
.transfer_size = PDCA_TRANSFER_SIZE_WORD
};
/* Initialize the PCDA for the ABDAC
* The channel number can be set in the configuration file
* with the define TPA6130_ABDAC_PDCA_CHANNEL.
*/
pdca_init_channel(TPA6130_ABDAC_PDCA_CHANNEL,
&tpa6130_abdac_pdca_options);
/* Enable the PDCA channel. Since we did not provide any data
* yet the channel is in idle mode */
pdca_enable(TPA6130_ABDAC_PDCA_CHANNEL);
}
/*! \brief Outputs a sample buffer to the DACs.
* The input requires a sample buffer that consists of words (32-bit)
* which contain two (16-bit) samples, one for each channel.
*
* \note The DACs must have been started beforehand.
*/
bool tpa6130_dac_output(void *sample_buffer, size_t sample_length)
{
//int global_interrupt_enabled;
/*Wait until the PDCA loads the reload value to its transfer
* counter register(TCRR=0). Then we are ready to set up a new
* transfer */
if(!(pdca_get_transfer_status(TPA6130_ABDAC_PDCA_CHANNEL) &
PDCA_TRANSFER_COUNTER_RELOAD_IS_ZERO))
{
return false;
}
/* Nothing to do if we get no data. */
if(sample_length)
{
/*TODO Do we really need to adjust the buffer for mono*/
/* While reloading the PDC we do not need any active interrupt*/
//if((global_interrupt_enabled = cpu_irq_is_enabled()))
// cpu_irq_disable();
/*FIXME This assumes a stereo 16-bit sample size */
// one sample here consists of 2x16-bit (16-bit stereo)
pdca_reload_channel(TPA6130_ABDAC_PDCA_CHANNEL,
sample_buffer, sample_length);
//if(global_interrupt_enabled)
// cpu_irq_enable();
/*TODO enable transfer complete interrupt
* Is it possible to move this to setup or other places?*/
if(tpa6130_output_param.callback_opt & AUDIO_DAC_OUT_OF_SAMPLE_CB)
pdca_enable_interrupt_transfer_complete(TPA6130_ABDAC_PDCA_CHANNEL);
if (tpa6130_output_param.callback_opt & AUDIO_DAC_RELOAD_CB)
pdca_enable_interrupt_reload_counter_zero(TPA6130_ABDAC_PDCA_CHANNEL);
}
return true;
}
bool tpa6130_dac_is_volume_muted(void)
{
return false;
}
void tpa6130_dac_mute(bool mute)
{
// //1st Version Mute Audio for Play/Pause
/* int volume=tpa6130_get_volume();
if(mute==true) {
//Mute volume
volume= volume|MUTE_L|MUTE_R;
}
else {
//Unmute volume
volume= volume&(~(MUTE_L|MUTE_R));
}
tpa6130_write_data(TPA6130_VOLUME_AND_MUTE,volume);
*/
//2n Version Stop PDCA >> No lost of audio when pause
/* if(mute==true) {
pdca_disable(TPA6130_ABDAC_PDCA_CHANNEL);
}
else {
pdca_enable(TPA6130_ABDAC_PDCA_CHANNEL);
}
*/
// 3rd Version wait until the current buffers are empty and disable the interrupts
int8_t volume = tpa6130_get_volume();
if (mute)
{
uint32_t save_dac_reload_callback_opt;
// Mute the audio stream
volume = volume | MUTE_L | MUTE_R;
tpa6130_write_data(TPA6130_VOLUME_AND_MUTE, volume);
// Disable the reload channel of the interrupt
save_dac_reload_callback_opt = tpa6130_output_param.callback_opt;
tpa6130_output_param.callback_opt = 0;
// Disable the reload interruption and wait until the transfer is complete
pdca_disable_interrupt_reload_counter_zero(TPA6130_ABDAC_PDCA_CHANNEL);
while (!(pdca_get_transfer_status(TPA6130_ABDAC_PDCA_CHANNEL) & PDCA_TRANSFER_COMPLETE));
// Restore the reload callback function
tpa6130_output_param.callback_opt = save_dac_reload_callback_opt;
}
else
{
// Re-enable the interrupts
pdca_enable_interrupt_reload_counter_zero(TPA6130_ABDAC_PDCA_CHANNEL);
// Un-mute the audio stream
volume = volume & (~(MUTE_L | MUTE_R));
tpa6130_write_data(TPA6130_VOLUME_AND_MUTE, volume);
}
}
void ms3_dac_setup(U32 sample_rate_hz, U8 num_channels, U8 bits_per_sample,
bool swap_channels, void (*callback)(U32 arg), U32 callback_opt,
U32 pba_hz)
{
//configure clock
if (sample_rate_hz < (8000 + 8021) / 2) {
usb_stream_resync_frequency = 4096000;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
else if (sample_rate_hz < (8021 + 22050) / 2) {
usb_stream_resync_frequency = 4106752;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
else if (sample_rate_hz < (22050 + 32000) / 2) {
usb_stream_resync_frequency = 11289600;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
else if (sample_rate_hz < (32000 + 44100) / 2) {
usb_stream_resync_frequency = 16384000;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
else if (sample_rate_hz < (44100 + 48000) / 2) {
usb_stream_resync_frequency = 22579200;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
else if (sample_rate_hz < (48000 + 88200) / 2) {
usb_stream_resync_frequency = 24576000;
cs2200_freq_clk_out(_32_BITS_RATIO(usb_stream_resync_frequency, CS2200_FREF));
}
//configure ssc to use clock on TX_CLOCK pin
AVR32_SSC.tcmr = (0 << AVR32_SSC_TCMR_CKO_OFFSET)
| (1 << AVR32_SSC_TCMR_STTDLY_OFFSET)
| (2 << AVR32_SSC_TCMR_CKS_OFFSET)
| (7 << AVR32_SSC_TCMR_START_OFFSET)
| (0x1f << AVR32_SSC_TCMR_PERIOD_OFFSET);
AVR32_SSC.tfmr = (0xf << AVR32_SSC_TFMR_DATLEN_OFFSET)
| (1 << AVR32_SSC_TFMR_MSBF_OFFSET)
| (1 << AVR32_SSC_TFMR_FSOS_OFFSET)
| (1 << AVR32_SSC_TFMR_FSLENHI_OFFSET)
| (0xf << AVR32_SSC_TFMR_FSLEN_OFFSET);
AVR32_SSC.cr = AVR32_SSC_CR_TXEN_MASK;
//configure DMA
pdca_channel_options_t ms3_ssc_pdca_options = {
.addr = NULL,
.size = 0,
.r_addr = NULL,
.r_size = 0,
.pid = AVR32_PDCA_PID_SSC_TX,
.transfer_size = (bits_per_sample <= 8)?PDCA_TRANSFER_SIZE_BYTE:
(bits_per_sample <= 16)?PDCA_TRANSFER_SIZE_HALF_WORD:
PDCA_TRANSFER_SIZE_WORD
};
pdca_init_channel(MS3_SSC_TX_PDCA_CHANNEL, &ms3_ssc_pdca_options);
pdca_enable(MS3_SSC_TX_PDCA_CHANNEL);
//configure audio parameters
ms3_output_params.num_channels = num_channels;
ms3_output_params.callback = callback;
ms3_output_params.callback_opt = callback_opt;
}
bool ms3_dac_output(void *sample_buffer, size_t sample_length)
{
bool global_interrupt_enabled;
if (!(pdca_get_transfer_status(MS3_SSC_TX_PDCA_CHANNEL) &
PDCA_TRANSFER_COUNTER_RELOAD_IS_ZERO))
return false;
if (sample_length) {
if (ms3_output_params.num_channels == 1) {
S16 *s16_sample_buffer = sample_buffer;
int i;
for (i = sample_length - 1; i >= 0; i--) {
s16_sample_buffer[2 * i + 1] =
s16_sample_buffer[2 * i] =
s16_sample_buffer[i];
}
}
// The PDCA is not able to synchronize its start of transfer with the SSC
// start of period, so this has to be done by polling the TF pin.
// Not doing so may result in channels being swapped randomly.
if ((global_interrupt_enabled = Is_global_interrupt_enabled()))
Disable_global_interrupt();
if (pdca_get_transfer_status(MS3_SSC_TX_PDCA_CHANNEL) &
PDCA_TRANSFER_COMPLETE) {
while (gpio_get_pin_value(MS3_SSC_TX_FRAME_SYNC_PIN));
while (!gpio_get_pin_value(MS3_SSC_TX_FRAME_SYNC_PIN));
}
pdca_reload_channel(MS3_SSC_TX_PDCA_CHANNEL, sample_buffer, sample_length * 2);
pdca_get_reload_size(MS3_SSC_TX_PDCA_CHANNEL);
if (global_interrupt_enabled)
Enable_global_interrupt();
if (ms3_output_params.callback_opt & AUDIO_DAC_OUT_OF_SAMPLE_CB)
pdca_enable_interrupt_transfer_complete(MS3_SSC_TX_PDCA_CHANNEL);
if (ms3_output_params.callback_opt & AUDIO_DAC_RELOAD_CB)
pdca_enable_interrupt_reload_counter_zero(MS3_SSC_TX_PDCA_CHANNEL);
}
return true;
}