Can anyone explain the rationale behind the CX25843 baseband audio
processing path being run at 32000 samples/second for I2S audio?
Here's my commented version of the setup from the cx18 code (which has
it's roots in the cx25840 code):
For 44.1 ksps I2S audio:
/* src1_ctl */
/* 0x1.60cd = 44100/32000 */
cx18_av_write4(cx, 0x8f8, 0x080160cd);
/* src3/4/6_ctl */
/* 0x1.7385 = 2 * (32000/44100) */
cx18_av_write4(cx, 0x900, 0x08017385);
cx18_av_write4(cx, 0x904, 0x08017385);
cx18_av_write4(cx, 0x90c, 0x08017385);
For 48 ksps I2S audio:
/* src1_ctl */
/* 0x1.8000 = 48000/32000 */
cx18_av_write4(cx, 0x8f8, 0x08018000);
/* src3/4/6_ctl */
/* 0x1.5555 = 2 * (32000/48000) */
cx18_av_write4(cx, 0x900, 0x08015555);
cx18_av_write4(cx, 0x904, 0x08015555);
cx18_av_write4(cx, 0x90c, 0x08015555);
Regards,
Andy
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