/*
* Helper function to write aic23 registers
*/
static void set_aic23_register(MCBSP_Handle hMcbsp, Uint16 reg, Uint16 val) {
val &= 0x1ff;
//LOG_printf(&LOG0, "Transmit data: %d", (reg<<9) | val);
while(!MCBSP_xrdy(hMcbsp));
MCBSP_write(hMcbsp, (reg<<9) | val);
while (MCBSP_xrdy(hMcbsp));
}
void codec_reg_set(uint16_t num, uint16_t val)
{
val &= 0x1ff;
while(!MCBSP_xrdy(mcbspControlHandle));
MCBSP_write(mcbspControlHandle, (num << 9) | val);
while(!MCBSP_xrdy(mcbspControlHandle));
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
int out = 0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
//create temporary variable of left channel for processing
short tempF = temp.channel[1];
//scale up input value to Q-26
int tempScaled = tempF << 11;
int i;
out = tempScaled;
//reset the cyclical buffer sub-index
if(n >= 3){
n = 0;
}
//calculate the output of each second order section and pass it to the next
for(i = 0; i < 11; i++)
{
out = lordBiquad(out, i);
}
n++;
//downscale the output back to Q-15 and cast as a short before writing to the codec
temp.channel[0] = (short)(out >> 11);
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
main()
{
LOG_printf(&myLog, "main begin");
/*DSK6713_LED_toggle(0);
DSK6713_LED_toggle(1);
DSK6713_LED_toggle(2);
DSK6713_LED_toggle(3);*/
hMcbsp = 0;
CSL_init();
/* Configure McBSP0 and AIC23 */
Config_DSK6713_AIC23();
/* Configure McBSP1*/
hMcbsp = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
MCBSP_config(hMcbsp, &datainterface_config);
/* configure EDMA */
config_EDMA();
/* finally the interrupts */
config_interrupts();
//MCBSP_start(hMcbsp, RRST, 0xffffffff); // EIGEN!!!: Start Field: Recieve
MCBSP_start(hMcbsp, MCBSP_RCV_START | MCBSP_XMIT_START | MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 220); // EIGEN!!!: Start Field: Recieve
// Es gibt auch noch MCBSP_SRGR_START (start sample Rate Generator) und MCBSP_SRGR_FRAMESYNC (start frame sync. generation)
MCBSP_write(hMcbsp, 0x0); /* one shot */
LOG_printf(&myLog, "main end");
//DSK6713_LED_toggle(2);
} /* finished*/
// for out to Left and Right channels
void output_sample(int out_data) {
short CHANNEL_data;
// clear data structure
AIC_data.uint=0;
// 32-bit data -->data structure
AIC_data.uint=out_data;
/********************************************************************************
* The existing interface defaults to right channel. To default instead to the
* left channel and use output_sample(short), left and right channels are swapped
* In main source program use LEFT 0 and RIGHT 1 (opposite of what is used here)
********************************************************************************/
// swap left and right channels
CHANNEL_data=AIC_data.channel[RIGHT];
AIC_data.channel[RIGHT]=AIC_data.channel[LEFT];
AIC_data.channel[LEFT]=CHANNEL_data;
// if ready to transmit
if (poll) while(!MCBSP_xrdy(DSK6713_AIC23_DATAHANDLE));
// write/output data
MCBSP_write(DSK6713_AIC23_DATAHANDLE,AIC_data.uint);
}
main()
{
CSL_init();
/* Configure McBSP0 and AIC23 */
Config_DSK6713_AIC23();
/* Configure McBSP1*/
hMcbsp = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
MCBSP_config(hMcbsp, &datainterface_config);
/* configure EDMA */
config_EDMA();
DSK6713_LED_off(0);
DSK6713_LED_on(1);
DSK6713_LED_off(2);
DSK6713_LED_on(3);
/* finally the interrupts */
config_interrupts();
MCBSP_start(hMcbsp, MCBSP_XMIT_START | MCBSP_RCV_START, 0xffffffff); // Start Audio IN & OUT transmision
MCBSP_write(hMcbsp, 0x0); /* one shot */
configComplete = 1;
//t_reg = DSK6713_rget(DSK6713_MISC);
//t_reg |= MCBSP1SEL; // Set MCBSP1SEL to 1 (extern)
//DSK6713_rset(DSK6713_MISC,t_reg);
} /* finished*/
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
int out = 0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
//create temporary variable of left channel for processing
short tempIn = temp.channel[1];
//Shift input signal to a Q-26 number
int tempScaled = tempIn << 11;
//initialize storage variable for calculating intermediate values
//sum will be a Q-26 number
int sum = 0;
//loop variables
int k, i;
//reset cyclical buffer index
if(n >= 11)
{
n = 0;
}
//calculate intermediate values
//iterate to sum the last 18 intermediate values*A_coefficients
for(k = 1; k<L; k++){
i = n - k;
if(i < 0){
i += L;
}
//coefficients are Q-12 and intermediate values are Q-14 resulting in adding Q-26 numbers to sum
sum += ((DEN[k])*(w[i]));
}
//subtract sum(Q-26) from the current scaled reading(Q-26) and scale down to Q-14 to store as an intermediate value
w[n] = (tempScaled - sum) >> 12;
//iterate to sum the current and last 18 intermediate values*B_coefficients
for(k=0;k<L;k++){
i = n - k;
if(i < 0){
i += L;
}
//scale down intermediate values to avoid output overflow
out += (NUM[k]*(w[i] >> 10));
}
n++;
//scale down the output and cast as a short before writing to the codec
temp.channel[0] = (short)(out >> 8);
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
float out = 0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
//create temporary variable of left channel for processing
float tempF = temp.channel[1];
float sum = 0;
//perform scaling => [-1, 1)
tempF /= 32768;
int k, i;
if(n >= 11)
{
n = 0;
}
//calculate intermediate values
//iterate to sum the last 18 intermediate values*A_coefficients
for(k = 1; k<L; k++){
i = n - k;
if(i < 0){
i += L;
}
sum += DEN[k]*w[i];
}
//subtract sum from the current scaled reading
w[n] = tempF - sum;
if(w[n] > maxIntermediate){
maxIntermediate = w[n];
}
if(w[n] < maxMin){
maxMin = w[n];
}
//iterate to sum the current and last 18 intermediate values*B_coefficients
for(k=0;k<L;k++){
i = n - k;
if(i < 0){
i += L;
}
out += NUM[k] * w[i];
}
n++;
//rescale and output
out *= 32768;
temp.channel[0] = (short)out;
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
/*
* initEdma() - Initialize the DMA controller. Use linked transfers to
* automatically transition from ping to pong and visa-versa.
*/
void initEdma(void)
{
/* Configure transmit channel */
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // get hEdmaXmt handle and reset channel
hEdmaReloadXmtPing = EDMA_allocTable(-1); // get hEdmaReloadXmtPing handle
hEdmaReloadXmtPong = EDMA_allocTable(-1); // get hEdmaReloadXmtPong handle
gEdmaConfigXmt.dst = MCBSP_getXmtAddr(hMcbsp1); // set the desination address to McBSP1 DXR
gXmtChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigXmt.opt |= EDMA_FMK(OPT,TCC,gXmtChan); // set TCC to gXmtChan
EDMA_config(hEdmaXmt, &gEdmaConfigXmt); // then configure the registers
EDMA_config(hEdmaReloadXmtPing, &gEdmaConfigXmt); // and the reload for Ping
gEdmaConfigXmt.src = EDMA_SRC_OF(gBufferXmtPong); // change the structure to have a source of Pong
EDMA_config(hEdmaReloadXmtPong, &gEdmaConfigXmt); // and configure the reload for Pong
EDMA_link(hEdmaXmt,hEdmaReloadXmtPong); // link the regs to Pong
EDMA_link(hEdmaReloadXmtPong,hEdmaReloadXmtPing); // link Pong to Ping
EDMA_link(hEdmaReloadXmtPing,hEdmaReloadXmtPong); // and link Ping to Pong
/* Configure receive channel */
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // get hEdmaRcv handle and reset channel
hEdmaReloadRcvPing = EDMA_allocTable(-1); // get hEdmaReloadRcvPing handle
hEdmaReloadRcvPong = EDMA_allocTable(-1); // get hEdmaReloadRcvPong handle
gEdmaConfigRcv.src = MCBSP_getRcvAddr(hMcbsp1); // and the desination address to McBSP1 DXR
gRcvChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigRcv.opt |= EDMA_FMK(OPT,TCC,gRcvChan); // set TCC to gRcvChan
EDMA_config(hEdmaRcv, &gEdmaConfigRcv); // then configure the registers
EDMA_config(hEdmaReloadRcvPing, &gEdmaConfigRcv); // and the reload for Ping
gEdmaConfigRcv.dst = EDMA_DST_OF(gBufferRcvPong); // change the structure to have a destination of Pong
EDMA_config(hEdmaReloadRcvPong, &gEdmaConfigRcv); // and configure the reload for Pong
EDMA_link(hEdmaRcv,hEdmaReloadRcvPong); // link the regs to Pong
EDMA_link(hEdmaReloadRcvPong,hEdmaReloadRcvPing); // link Pong to Ping
EDMA_link(hEdmaReloadRcvPing,hEdmaReloadRcvPong); // and link Ping to Pong
/* Enable interrupts in the EDMA controller */
EDMA_intClear(gXmtChan);
EDMA_intClear(gRcvChan); // clear any possible spurious interrupts
EDMA_intEnable(gXmtChan); // enable EDMA interrupts (CIER)
EDMA_intEnable(gRcvChan); // enable EDMA interrupts (CIER)
EDMA_enableChannel(hEdmaXmt); // enable EDMA channel
EDMA_enableChannel(hEdmaRcv); // enable EDMA channel
/* Do a dummy write to generate the first McBSP transmit event */
MCBSP_write(hMcbsp1, 0);
}
void sendData(uint32_t * ptr)
{
while(!MCBSP_rrdy(mcbspDataHandle));
MCBSP_write(mcbspDataHandle, *ptr);
asm(" nop");
asm(" nop");
asm(" nop");
asm(" nop");
asm(" nop");
asm(" nop");
}
unsigned char spiTransferByte(unsigned char arg_byte)
{
unsigned char i;
MCBSP_write(C55XX_SPI_hMcbsp, arg_byte);
while (!MCBSP_xrdy(C55XX_SPI_hMcbsp));
i = MCBSP_read(C55XX_SPI_hMcbsp);
#if 0
if (arg_byte == 0 && i == 0) hpprintf ("*"); else
hpprintf("(%x)=%x\n", arg_byte, i);
#endif
return i;
}
//for output from right channel
void output_right_sample(short out_data) {
// clear data structure
AIC_data.uint=0;
// data from Right channel -->data structure
AIC_data.channel[RIGHT]=out_data;
// if ready to transmit
if (poll) while(!MCBSP_xrdy(DSK6713_AIC23_DATAHANDLE));
// output right channel
MCBSP_write(DSK6713_AIC23_DATAHANDLE,AIC_data.uint);
}
unsigned char if_spiSend(hwInterface *iface, euint8 outgoing)
{
unsigned char r;
/* while((*(unsigned volatile long*)McBSP0_SPCR & 0x20000)==0);
*(unsigned volatile char*)McBSP0_DXR=outgoing;
while(((*(unsigned volatile long*)McBSP0_SPCR & 0x2)==0));
r=*(unsigned volatile char*)McBSP0_DRR; */
while(!MCBSP_xrdy(iface->port->hBsp));
MCBSP_write(iface->port->hBsp,outgoing);
while(!MCBSP_rrdy(iface->port->hBsp));
r=MCBSP_read(iface->port->hBsp);
return(r);
}
static void set_aic23_register(MCBSP_Handle hMcbsp,unsigned short regnum, unsigned short regval)
{
/* Programmierung erfolgt so, dass in B[15:9] die Registernummer steht und
in B[8:0] die zu schreibenden Daten */
/* zur Sicherheit maskieren auf 9 Bit */
regval &= 0x1ff;
//regnum &= 0x07f;
/* warten */
while (!MCBSP_xrdy(hMcbsp));
/* schreiben */
MCBSP_write(hMcbsp, (regnum << 9) | regval);
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
int out = 0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
//create temporary variable of left channel for processing
short tempF = temp.channel[1];
int sum = 0;
int k, i;
if(n >= 11)
{
n = 0;
}
//iterate to sum the last 18 intermediate values*A_coefficients
for(k = 1; k<L; k++){
i = n - k;
if(i < 0){
i += L;
}
sum += DEN[k]*w[i];
}
//subtract sum from the current scaled reading
w[n] = tempF - sum;
//iterate to sum the current and last 18 intermediate values*B_coefficients
for(k=0;k<L;k++){
i = n - k;
if(i < 0){
i += L;
}
out += NUM[k] * w[i];
}
n++;
temp.channel[0] = (short)out;
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
float out = 0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
//temp.channel[1] = temp.channel[0];
//create temporary variable of left channel for processing
float tempF = temp.channel[1];
//perform scaling => [-1, 1)
tempF /= 32768;
//wait for buffer to fill up with samples before filtering
//buffer is full, now perform filter
int i,j;
if(n >= ORDER)
{
n = 0;
}
x[n] = tempF;
//Calculate filter gain
for(i = 0; i < ORDER; i++){
j = n - i;
if(j < 0){
j += ORDER;
}
out += B[i] * x[j];
}
n++;
//rescale and output
out *= 32768;
temp.channel[0] = (short)out;
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
if(pingFlag == 1 && lflag == 1)
{
PONG[pongIndex].re = temp.channel[1];
PONG[pongIndex].re /= 32768;
PONG[pongIndex].im = 0;
temp.channel[0] = (short)outputPING[pongIndex];
pongIndex++;
if(pongIndex >= FFT_LENGTH - (ORDER - 1))
{
pongFlag = 1;
pongIndex = 0;
pingFlag = 0;
}
}
if(pongFlag == 1 && lflag == 1)
{
PING[pingIndex].re = temp.channel[1];
PING[pingIndex].re /= 32768;
PING[pingIndex].im = 0;
temp.channel[0] = (short)outputPONG[pingIndex];
pingIndex++;
if(pingIndex >= FFT_LENGTH - (ORDER - 1))
{
pingFlag = 1;
pingIndex = 0;
pongFlag = 0;
}
}
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo);
}
void DSK6713_configure_AIC23() {
/* Configure McBSP0 as control interface for aic23 */
MCBSP_Handle MCBSP0_handle;
MCBSP0_handle = MCBSP_open(MCBSP_DEV0, MCBSP_OPEN_RESET);
MCBSP_config(MCBSP0_handle, &MCBSP0_config);
MCBSP_start(MCBSP0_handle, MCBSP_XMIT_START | MCBSP_SRGR_START | MCBSP_SRGR_START, 220);
set_aic23_register(MCBSP0_handle, RESET_REGISTER, 0x0000);
set_aic23_register(MCBSP0_handle, POWER_DOWN_CONTROL, 0x0000);
set_aic23_register(MCBSP0_handle, LEFT_LINE_INPUT_CHANNEL_VOLUME, 0x0017);
set_aic23_register(MCBSP0_handle, RIGHT_LINE_INPUT_CHANNEL_VOLUME, 0x0017);
set_aic23_register(MCBSP0_handle, LEFT_CHANNEL_HEADPHONE_VOLUME, 0x00f9);
set_aic23_register(MCBSP0_handle, RIGHT_CHANNEL_HEADPHONE_VOLUME, 0x00f9);
set_aic23_register(MCBSP0_handle, ANALOG_AUDIO_PATH, 0x0011); // 00001 0010
set_aic23_register(MCBSP0_handle, DIGITAL_AUDIO_PATH, 0x0000); // 000000000
set_aic23_register(MCBSP0_handle, DIGITAL_AUDIO_INTERFACE_FORMAT, 0x0043); //0 0100 0001
set_aic23_register(MCBSP0_handle, SAMPLE_RATE_CONTROL, 0x000d); // 01100
set_aic23_register(MCBSP0_handle, DIGITAL_INTERFACE_ACTIVATION, 0x0001);
/* Configure McBSP1 as data interface for aic23 */
MCBSP_Handle MCBSP1_handle;
MCBSP1_handle = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
MCBSP_config(MCBSP1_handle, &MCBSP1_config);
MCBSP_start(MCBSP1_handle, MCBSP_XMIT_START|MCBSP_RCV_START|MCBSP_SRGR_FRAMESYNC|MCBSP_SRGR_START, 220);
/* Configure receive EDMA */
EDMA_Handle hEdmaRcv;
EDMA_Handle hEdmaRcvA;
EDMA_Handle hEdmaRcvB;
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET);
hEdmaRcvA = EDMA_allocTable(-1);
hEdmaRcvB = EDMA_allocTable(-1);
gEdmaRcvConfig.src = MCBSP_getRcvAddr(MCBSP1_handle); // Get address of DRR
gTccRcvChan = EDMA_intAlloc(-1); // get next free transfer complete code
gEdmaRcvConfig.opt |= EDMA_FMK(OPT, TCC, gTccRcvChan);
EDMA_config(hEdmaRcv, &gEdmaRcvConfig);
EDMA_config(hEdmaRcvA, &gEdmaRcvConfig);
gEdmaRcvConfig.dst = EDMA_DST_OF(gRcvBufferB);
EDMA_config(hEdmaRcvB, &gEdmaRcvConfig);
EDMA_link(hEdmaRcv, hEdmaRcvB);
EDMA_link(hEdmaRcvB, hEdmaRcvA);
EDMA_link(hEdmaRcvA, hEdmaRcvB);
/* Configure transmit EDMA */
EDMA_Handle hEdmaXmt;
EDMA_Handle hEdmaXmtA;
EDMA_Handle hEdmaXmtB;
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET);
hEdmaXmtA = EDMA_allocTable(-1);
hEdmaXmtB = EDMA_allocTable(-1);
gEdmaXmtConfig.dst = MCBSP_getXmtAddr(MCBSP1_handle); // Get address of DXR
gTccXmtChan = EDMA_intAlloc(-1); // get next free transfer complete code
gEdmaXmtConfig.opt |= EDMA_FMK(OPT, TCC, gTccXmtChan);
EDMA_config(hEdmaXmt, &gEdmaXmtConfig);
EDMA_config(hEdmaXmtA, &gEdmaXmtConfig);
gEdmaXmtConfig.src = EDMA_DST_OF(gXmtBufferB); // set source to buffer B
EDMA_config(hEdmaXmtB, &gEdmaXmtConfig);
EDMA_link(hEdmaXmt, hEdmaXmtB);
EDMA_link(hEdmaXmtB, hEdmaXmtA);
EDMA_link(hEdmaXmtA, hEdmaXmtB);
EDMA_intClear(gTccRcvChan);
EDMA_intClear(gTccXmtChan);
EDMA_intEnable(gTccRcvChan);
EDMA_intEnable(gTccXmtChan);
gBufferState.cpuBufferState = StateB; // inittial cpu buffer state
EDMA_enableChannel(hEdmaRcv);
EDMA_enableChannel(hEdmaXmt);
IRQ_clear(IRQ_EVT_EDMAINT);
IRQ_enable(IRQ_EVT_EDMAINT);
MCBSP_write(MCBSP1_handle, 0x00);
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
short ii=0;
short jj=0;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
// keep track of largest sample for diagnostics
if (temp.channel[0]>max_samp)
max_samp = temp.channel[0];
if (state==0) { // SEARCHING STATE
// put sample in searching buffer
buf[bufindex] = (float) temp.channel[0]; // right channel
// compute incoherent correlation
zc = 0;
zs = 0;
for (ii=0;ii<M;ii++) {
zc += mfc[ii]*buf[ii];
zs += mfs[ii]*buf[ii];
}
zz = zc*zc+zs*zs;
if (zz>T1) { // threshold exceeded?
max_recbuf = 0;
state = 1; // enter "recording" state (takes effect in next interrupt)
DSK6713_LED_toggle(0); // toggle LED here for diagnostics
// record time of first sample (DRB fixed 4/19/2015: added +1)
recbuf_start_clock = sincpulsebuf_counter-M+1; // should not be negative since we started counting when we launched the S->M sinc pulse
recbufindex = M; // start recording new samples at position M
jj = bufindex; //
for (ii=0;ii<M;ii++){ // copy samples from buf to first M elements of recbuf
jj++; // the first time through, this puts us at the oldest sample
if (jj>=M)
jj=0;
recbuf[ii] = buf[jj];
buf[jj] = 0; // clear out searching buffer to avoid false trigger
}
}
else {
// increment and wrap pointer
bufindex++;
if (bufindex>=M)
bufindex = 0;
}
}
else if (state==1) { // RECORDING STATE
// put sample in recording buffer
recbuf[recbufindex] = (float) temp.channel[0]; // right channel
recbufindex++;
if (recbufindex>=(2*N+2*M)) {
state = 2; // buffer is full
delay_est_done = 0; // clear flag
DSK6713_LED_toggle(0); // toggle LED here for diagnostics
recbufindex = 0; // shouldn't be necessary
}
}
else if (state==2) { // CALCULATING DELAY ESTIMATES STATE
if (delay_est_done==1) { // are the delay estimates done calculating?
state = 3; // next state
}
}
else if (state==3) { // WRITE ADJUSTED VIRTUAL CLOCK BUFFER STATE
delay_est_done = 0; // clear flag
state = 0; // xxx temporary
}
if (state==-1) { // WARMUP STATE (NO OUTPUT)
if (sincpulsebuf_counter>LL/2) {
state = 0;
}
temp.channel[1] = 0;
temp.channel[0] = 0;
}
else {
if (vclock_counter==buffer_swap_index)
swap_pending = 1;
if ((swap_pending==1)&&(state!=2)) // ok to swap buffer
{
swap_pending = 0;
buffer_just_swapped = 1;
if (current_clockbuf==0)
current_clockbuf = 1;
else
current_clockbuf = 0;
}
temp.channel[1] = clockbuf_shifted[current_clockbuf][vclock_counter]; // slave *shifted* clock signal (always played)
// temp.channel[1] = clockbuf[vclock_counter]; // slave *unshifted* clock signal (for debug)
temp.channel[0] = sincpulsebuf[sincpulsebuf_counter]; // this initiates the sinc pulse exchange with the master
}
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo); // output L/R channels
// update virtual clock (cycles from 0 to L-1)
vclock_counter++;
if (vclock_counter>=L) {
vclock_counter = 0; // clock tick occurred, wrap
}
// update sinc pulse counter (cycles from 0 to LL-1)
// this is for sinc pulses from the slave to the master
// sinc pulses from the slave to the master have their peak at
// sincpulsebuf_counter = 0 (this makes clock offset calculations simple)
sincpulsebuf_counter++;
if (sincpulsebuf_counter>=LL) {
sincpulsebuf_counter = 0; // wrap
}
}
void codec_reset()
{
while(!MCBSP_xrdy(mcbspControlHandle));
MCBSP_write(mcbspControlHandle, (15 << 9) | 0);
while(!MCBSP_xrdy(mcbspControlHandle));
}
interrupt void serialPortRcvISR()
{ union {Uint32 combo; short channel[2];} temp;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
// keep track of largest sample for diagnostics
if (temp.channel[0]>max_samp)
max_samp = temp.channel[0];
if (state==STATE_SEARCH) { // SEARCHING STATE
//search_for_thresh(&(temp.channel[0]),PASSTHROUGH);
// isSearching++;
// put sample in searching buffer
///*
buf[bufindex] = (float) temp.channel[0]; // right channel
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
// compute incoherent correlation
zc = 0;
zs = 0;
for(i=0;i<M;i++) {
zc += mfc[i]*buf[i];
zs += mfs[i]*buf[i];
}
z = zc*zc+zs*zs;
if (z>T1) { // threshold exceeded?
max_recbuf = 0;
state = 1; // enter "recording" state (takes effect in next interrupt)
recbufindex = M; // start recording new samples at position M
j = bufindex; //
for (i=0;i<M;i++){ // copy samples from buf to first M elements of recbuf
j++; // the first time through, this puts us at the oldest sample
if (j>=M)
j=0;
recbuf[i] = (short) buf[j];
buf[j] = 0; // clear out searching buffer to avoid false trigger
}
}
else {
// increment and wrap pointer
bufindex++;
if (bufindex>=M)
bufindex = 0;
}
//*/
}
else if (state==STATE_RECORD) { // RECORDING STATE
//DEBUG
if(!ledTriggered)
{
DSK6713_LED_toggle(0);
ledTriggered = 1;
}
// put sample in recording buffer
recbuf[recbufindex] = temp.channel[0]; // right channel
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
if (abs(recbuf[recbufindex])>max_recbuf) {
max_recbuf = abs(recbuf[recbufindex]); // keep track of largest sample
}
recbufindex++;
if (recbufindex>=(2*N+2*M)) {
state = STATE_WAIT_CLOCK; // buffer is full (stop recording and start counting samples to next clock tick)
recbufindex = 0; // shouldn't be necessary
wait_count = 0; // reset the wait counter
if (max_recbuf<2048)
playback_scale = 0; // don't send response (signal was too weak)
else if (max_recbuf<4096)
playback_scale = 8; // reply and scale by 8
else if (max_recbuf<8192)
playback_scale = 4; // reply and scale by 4
else if (max_recbuf<16384)
playback_scale = 2; // reply and scale by 2
else
playback_scale = 1; // no scaling
}
}
else if (state==STATE_WAIT_CLOCK) { // WAITING STATE (counting up samples until clock tick)
if(ledTriggered){
DSK6713_LED_toggle(0);
ledTriggered = 0;
}
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
wait_count++;
// only way out of this state is when the virtual clock rolls over
}
else if (state==STATE_WAIT_PLAYBACK) { // WAITING STATE (counting down samples until reply)
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
wait_count--;
if (wait_count<0) {
state = 4; // done waiting, time to play back rec_buffer in reverse
recbufindex = 2*N+2*M;
}
}
else if (state==STATE_RESPOND) { // RESPONSE STATE (play back recording buffer in reverse)
recbufindex--;
if (recbufindex>=0) {
temp.channel[0] = playback_scale*recbuf[recbufindex];
}
else
{
state = STATE_SEARCH; // go back to searching
}
}
temp.channel[1] = clockbuf[vclock_counter]; // master clock signal (always played)
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo); // output L/R channels
// update virtual clock (cycles from 0 to L-1)
vclock_counter++;
if (vclock_counter>=L) {
vclock_counter = 0; // clock tick occurred, wrap
if (state==STATE_WAIT_CLOCK) {
state = STATE_WAIT_PLAYBACK;
}
}
}
interrupt void serialPortRcvISR()
{
union {Uint32 combo; short channel[2];} temp;
temp.combo = MCBSP_read(DSK6713_AIC23_DATAHANDLE);
// Note that right channel is in temp.channel[0]
// Note that left channel is in temp.channel[1]
// keep track of largest sample for diagnostics
if (temp.channel[0]>max_samp)
max_samp = temp.channel[0];
// filter
inbuf[inindex] = (float) temp.channel[0]; // right channel
if (CLOCKOUTPUTCHANNEL==0) {
// superimposed clocks and sync pulses, need to use HPF to avoid false detections
hpfout = 0.0;
ii = 0;
for (kk=inindex;kk>=0;kk--){
hpfout += inbuf[kk]*B[ii];
ii++;
}
for (kk=BL-1;kk>inindex;kk--){
hpfout += inbuf[kk]*B[ii];
ii++;
}
}
else {
// clocks on left output, no need for HPF
hpfout = (float) temp.channel[0]; // right channel
}
if (state==0) { // SEARCHING STATE
// put sample in searching buffer
fbuf[bufindex] = hpfout; // right channel
buf[bufindex] = (float) temp.channel[0]; // unfiltered right channel
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
// compute incoherent correlation on filtered buffer
zc = 0;
zs = 0;
for(i=0;i<M;i++) {
zc += mfc[i]*fbuf[i];
zs += mfs[i]*fbuf[i];
}
z = zc*zc+zs*zs;
if (z>T1) { // threshold exceeded?
if (z<minz)
minz = z; // diagnostic
if (z>maxz)
maxz = z; // diagnostic
max_recbuf = 0;
state = 1; // enter "recording" state (takes effect in next interrupt)
DSK6713_LED_toggle(0); // toggle LED for diagnostics
recbufindex = M; // start recording new samples at position M
j = bufindex; //
for (i=0;i<M;i++){ // copy samples from buf to first M elements of recbuf
j++; // the first time through, this puts us at the oldest sample
if (j>=M)
j=0;
//recbuf[i] = (short) buf[j]; // Oct 28 bad idea
recbuf[i] = (short) fbuf[j]; // DRB: filtered buffer copied now to avoid echoing back clock pulses
fbuf[j] = 0; // clear out searching buffer to avoid false trigger
buf[j] = 0; // clear out searching buffer to avoid false trigger
}
}
else {
// increment and wrap pointer
bufindex++;
if (bufindex>=M)
bufindex = 0;
}
}
else if (state==1) { // RECORDING STATE
// put sample in recording buffer
//recbuf[recbufindex] = temp.channel[0]; // right channel
recbuf[recbufindex] = (short) hpfout; // filtered right channel
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
if (abs(recbuf[recbufindex])>max_recbuf) {
max_recbuf = abs(recbuf[recbufindex]); // keep track of largest sample for diagnostics
}
recbufindex++;
if (recbufindex>=(2*N+2*M)) {
state = 2; // buffer is full (stop recording and start counting samples to next clock tick)
DSK6713_LED_toggle(0); // toggle LED for diagnostics
recbufindex = 0; // shouldn't be necessary
wait_count = 0; // reset the wait counter
if (max_recbuf<2000)
playback_scale = 0; // don't send response (signal was too weak)
else if (max_recbuf<4000)
playback_scale = 8; // reply and scale by 8 (DRB now 4 to avoid overflow)
else if (max_recbuf<8000)
playback_scale = 4; // reply and scale by 4 (DRB now 2 to avoid overflow)
else if (max_recbuf<16000)
playback_scale = 2; // reply and scale by 2 (DRB now 1 tp avoid overflow)
else
playback_scale = 1; // no scaling
}
}
else if (state==2) { // WAITING STATE (counting up samples until clock tick)
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
wait_count++;
// only way out of this state is when the virtual clock rolls over
}
else if (state==3) { // WAITING STATE (counting down samples until reply)
if (PASSTHROUGH!=1) {
temp.channel[0] = 0; // can comment this out for debugging at home
}
wait_count--;
if (wait_count<HPFGROUPDELAY) {
state = 4; // done waiting, time to play back rec_buffer in reverse
recbufindex = 2*N+2*M;
}
}
else if (state==4) { // RESPONSE STATE (play back recording buffer in reverse)
recbufindex--;
if (recbufindex>=0) {
temp.channel[0] = playback_scale*recbuf[recbufindex]; // response always on right channel
}
else
{
state = 0; // go back to searching
}
}
// temp.channel[0] right channel has been previously set
temp.channel[1] = 0; // clear left channel
temp.channel[CLOCKOUTPUTCHANNEL] += clockbuf[vclock_counter]; // master clock signal (always played)
// temp.channel[0] = temp.channel[1]; // XXX DIAGNOSTIC FOR OUTPUT OFFSET TEST
// temp.channel[0] = clockbuf[vclock_counter]; // XXX DIAGNOSTIC
MCBSP_write(DSK6713_AIC23_DATAHANDLE, temp.combo); // output L/R channels
// update virtual clock (cycles from 0 to L-1)
vclock_counter++;
if (vclock_counter>=L) {
vclock_counter = 0; // clock tick occurred, wrap
if (state==2) {
state = 3;
}
}
inindex++;
if (inindex>BL-1)
inindex = 0;
}