|
hi, as part of my university project i have to collect samples from a telephone, make some signal processing and resending the samples to the telephone. i have succeeded in doing the same thing using the microphone and the loudspeakers, using McBSP1, using a simple program based on the 'codec' example. I have tried to do the same using the TEL codec, but no interrupts have been generated from the telephone (even though i suplied the phone a DC of 5V and i was able to create DTMF signals, or hear my self in it) Does anyone know how should i initiate the telephone's codec ? How can i generate the "off hook" needed for the telephone ? Is it possible to collect samples from the microphone and send them to the telephone (synchronizing 2 different codecs) ? thanks a lot, Rafi DaTo THE CODE ******** hDAA_0 = codec_open(DAA_CODEC); /* Acquire handle to codec */ /*Set codec parameters */ codec_dac_mode(hDAA_0, CODEC_DAC_15BIT); /* DAC in 15-bit mode */ codec_adc_mode(hDAA_0, CODEC_ADC_15BIT); /* ADC in 15-bit mode */ codec_ain_gain(hDAA_0, CODEC_AIN_0dB); /* 6dB gain on analog input to ADC */ codec_aout_gain(hDAA_0, CODEC_AOUT_MINUS_6dB); /* -6dB gain on analog output from DAC codec_sample_rate(hDAA_0,SR_8000); /* 16KHz sampling rate */ /* Initialize the interrupts registers */ asm(" ssbx intm"); asm(" NOP"); asm(" NOP"); asm(" NOP"); IMR=0x0030; /*0x0c30 = 0000110000110000b which enables the interrupts in IMR of BXINT0,BRINT0,BXINT1,BRINT1 */ asm(" NOP"); asm(" NOP"); asm(" NOP"); IFR=0x0000; PMST=0x00a0; //ST1 = 0x2b00; /*0x2b00 = 0010101101000000 in order to set FRCT to 1*/ asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" rsbx intm"); asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" NOP"); asm(" NOP"); /******************************************************************/ /* INTERRUPT --> get input samples from TEL */ /******************************************************************/ interrupt void INDATA_X (){ p_interrupt_buffer_x[interrupt_counter_x] = (*(volatile u16*)DRR1_ADDR(DAA_CODEC)); interrupt_counter_x++; work_buffer_READY_x=0; if (interrupt_counter_x==BLOCK_SIZE){ temp_pointer=p_interrupt_buffer_x; p_interrupt_buffer_x=p_work_buffer_x; p_work_buffer_x=temp_pointer; work_counter_x=0; work_buffer_READY_x=1; //to enable the start of FDAF on work_buffer_x interrupt_counter_x=0; } } |
|
|
need help in using McBSP0 (the TEL codec)
Started by ●June 24, 2002
Reply by ●June 25, 20022002-06-25
|
--- In c54x@y..., "radato1" <radato1@y...> wrote: > hi, > > as part of my university project i have to collect samples from a telephone, make some > signal processing and resending the samples to the telephone. > > i have succeeded in doing the same thing using the microphone and the loudspeakers, using > McBSP1, using a simple program based on the 'codec' example. I have tried to do the same > using the TEL codec, but no interrupts have been generated from the telephone (even though i > suplied the phone a DC of 5V and i was able to create DTMF signals, or hear my self in it) > > Does anyone know how should i initiate the telephone's codec ? > How can i generate the "off hook" needed for the telephone ? > Is it possible to collect samples from the microphone and send them to the telephone > (synchronizing 2 different codecs) ? > thanks a lot, > > Rafi DaTo > > THE CODE > ******** > > hDAA_0 = codec_open(DAA_CODEC); /* Acquire handle to codec */ > > /*Set codec parameters */ > codec_dac_mode(hDAA_0, CODEC_DAC_15BIT); /* DAC in 15- bit mode */ > codec_adc_mode(hDAA_0, CODEC_ADC_15BIT); /* ADC in 15- bit mode */ > codec_ain_gain(hDAA_0, CODEC_AIN_0dB); /* 6dB gain on analog input to ADC */ > codec_aout_gain(hDAA_0, CODEC_AOUT_MINUS_6dB); /* -6dB gain on analog output from DAC > codec_sample_rate(hDAA_0,SR_8000); /* 16KHz sampling rate */ > > > /* Initialize the interrupts registers */ > asm(" ssbx intm"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > IMR=0x0030; /*0x0c30 = 0000110000110000b which enables the interrupts in IMR > of BXINT0,BRINT0,BXINT1,BRINT1 */ > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > IFR=0x0000; > PMST=0x00a0; > //ST1 = 0x2b00; /*0x2b00 = 0010101101000000 in order to set FRCT to 1*/ > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" rsbx intm"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > asm(" NOP"); > > /******************************************************************/ > /* INTERRUPT --> get input samples from TEL */ > /******************************************************************/ > > interrupt void INDATA_X (){ > > p_interrupt_buffer_x[interrupt_counter_x] = (*(volatile u16*) DRR1_ADDR(DAA_CODEC)); > interrupt_counter_x++; > work_buffer_READY_x=0; > if (interrupt_counter_x==BLOCK_SIZE){ > > temp_pointer=p_interrupt_buffer_x; > p_interrupt_buffer_x=p_work_buffer_x; > p_work_buffer_x=temp_pointer; > work_counter_x=0; > work_buffer_READY_x=1; //to enable the start of FDAF on work_buffer_x > interrupt_counter_x=0; > } > > } Hi, Try using the daa_init() function in the DSK library. This should setup the proper CPLD register to enable the McBsp0 pointing to the DAA codec. Search for the daa.h file in the include folder of DSK. You can also do Onhook and Offhook with the supplied API, or you can directly set the DSP CPLD register (through IO address 0x04). Do a search from online help in CCS for "DSP Accessible Control" should give you details for the DSP CPLD register description. Hope this help Ben |
