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Update tdm slave sync check to only look for correct rising edge of frame clock

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Ed Clarke
2017-12-27 16:14:19 +00:00
parent 308e63a97d
commit 0f6bc2fa2c
1 changed files with 4 additions and 7 deletions
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11
lib_xua/src/core/audiohub/xua_audiohub.xc
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@@ -1252,13 +1252,10 @@ unsigned static deliver_slave(chanend ?c_out, chanend ?c_spd_out
if (i == 0) {
p_lrclk :> lrval;
#ifdef I2S_MODE_TDM
if (frameCount == (I2S_CHANS_PER_FRAME-2))
{
syncError += (lrval != 0x80000000);
}
else
{
syncError += (lrval != 0x00000000);
//Just check for the rising edge of frame synch being in the right place because falling edge timing not specified
if (frameCount == 0) {
lrval &= 0xc0000000; //Mask off last two (MSB) frame clock bits which are the most recently sampled
syncError += (lrval != 0x80000000); //We need MSB = 1 and MSB-1 = 0 to signify rising edge
}
#else
syncError += (lrval != 0x7FFFFFFF);