i.MX Processors中的主题 SLIC voice data receiving on iMx6 using ALSA https://community.nxp.com/t5/i-MX-Processors/SLIC-voice-data-receiving-on-iMx6-using-ALSA/m-p/1034173#M152593 <HTML><HEAD></HEAD><BODY><P>Hi, I am using iMx6q and trying to read data from phone input and SLIC IC. The IC is giving proper 8-bit Mu Law data at its DTX pin. The communication protocol between is I2S and is operating with parameters PCLK=512kHz and FSync=8kHz. The processor is the master, and I am using ALSA subset utilities (aplay.c userspace application C code) to read and write data on the PCM bus. The ALSA program has a set macro of MU_LAW and a predefined function of snd_pcm_mmap_readi() which has a different way of dealing with pcm areas. The 32-bit word from the PCM channel should be masked out as a 8-bit data via the I2S protocol. How do I modify the ALSA driver so that telephonic data can be read continuously, and fed into the ALSA ring buffer? Is the MU_LAW macro able to receive the 8-bit data properly? Has iMx6q ever been interfaced with SLIC before using ALSA/Linux? If yes, how were the timing diagram matched? Hi, I am using iMx6q and trying to read data from phone input and SLIC IC. The IC is giving proper 8-bit Mu Law data at its DTX pin. The communication protocol between is I2S and is operating with parameters PCLK=512kHz and FSync=8kHz. The processor is the master, and I am using ALSA subset utilities (aplay.c userspace application C code) to read and write data on the PCM bus. The ALSA program has a set macro of MU_LAW and a predefined function of snd_pcm_mmap_readi() which has a different way of dealing with pcm areas. The 32-bit word from the PCM channel should be masked out as a 8-bit data via the I2S protocol. How do I modify the ALSA driver so that telephonic data can be read continuously, and fed into the ALSA ring buffer? Is the MU_LAW macro able to receive the 8-bit data properly? Has iMx6q ever been interfaced with SLIC before using ALSA/Linux? If yes, how were the timing diagram matched? (Please don't share any documentation as a reply. I have been studying every single reference manual of NXP for the past year, and have got idea of SSI, fsl-dai, audio clocking and PCM timing diagrams. I have referred to the ref manual like completely and reached upto here.) (Please don't share any documentation as a reply. I have been studying every single reference manual of NXP for the past year, and have got idea of SSI, fsl-dai, audio clocking and PCM timing diagrams. I have referred to the ref manual like completely and reached upto here.)</P></BODY></HTML> Mon, 02 Mar 2020 05:42:36 GMT abhijeet_ghodga 2020-03-02T05:42:36Z SLIC voice data receiving on iMx6 using ALSA https://community.nxp.com/t5/i-MX-Processors/SLIC-voice-data-receiving-on-iMx6-using-ALSA/m-p/1034173#M152593 <HTML><HEAD></HEAD><BODY><P>Hi, I am using iMx6q and trying to read data from phone input and SLIC IC. The IC is giving proper 8-bit Mu Law data at its DTX pin. The communication protocol between is I2S and is operating with parameters PCLK=512kHz and FSync=8kHz. The processor is the master, and I am using ALSA subset utilities (aplay.c userspace application C code) to read and write data on the PCM bus. The ALSA program has a set macro of MU_LAW and a predefined function of snd_pcm_mmap_readi() which has a different way of dealing with pcm areas. The 32-bit word from the PCM channel should be masked out as a 8-bit data via the I2S protocol. How do I modify the ALSA driver so that telephonic data can be read continuously, and fed into the ALSA ring buffer? Is the MU_LAW macro able to receive the 8-bit data properly? Has iMx6q ever been interfaced with SLIC before using ALSA/Linux? If yes, how were the timing diagram matched? Hi, I am using iMx6q and trying to read data from phone input and SLIC IC. The IC is giving proper 8-bit Mu Law data at its DTX pin. The communication protocol between is I2S and is operating with parameters PCLK=512kHz and FSync=8kHz. The processor is the master, and I am using ALSA subset utilities (aplay.c userspace application C code) to read and write data on the PCM bus. The ALSA program has a set macro of MU_LAW and a predefined function of snd_pcm_mmap_readi() which has a different way of dealing with pcm areas. The 32-bit word from the PCM channel should be masked out as a 8-bit data via the I2S protocol. How do I modify the ALSA driver so that telephonic data can be read continuously, and fed into the ALSA ring buffer? Is the MU_LAW macro able to receive the 8-bit data properly? Has iMx6q ever been interfaced with SLIC before using ALSA/Linux? If yes, how were the timing diagram matched? (Please don't share any documentation as a reply. I have been studying every single reference manual of NXP for the past year, and have got idea of SSI, fsl-dai, audio clocking and PCM timing diagrams. I have referred to the ref manual like completely and reached upto here.) (Please don't share any documentation as a reply. I have been studying every single reference manual of NXP for the past year, and have got idea of SSI, fsl-dai, audio clocking and PCM timing diagrams. I have referred to the ref manual like completely and reached upto here.)</P></BODY></HTML> Mon, 02 Mar 2020 05:42:36 GMT https://community.nxp.com/t5/i-MX-Processors/SLIC-voice-data-receiving-on-iMx6-using-ALSA/m-p/1034173#M152593 abhijeet_ghodga 2020-03-02T05:42:36Z