void set_gclk2_freq(int freq_hz)
{
if (!abdac_set_dac_sample_rate(freq_hz))
abdac_set_dac_hz(TPA6130_ABDAC, FOSC1, freq_hz);
}
/*! \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);
}
}
