- Hi ti team，
- The following experiments were conducted to initialize the parameters of TAS5825M to open AGL, which would cause sound variation (random) :
1. If AGL is not enabled for the 5825M parameter, the sound is normal. If AGL is enabled, sometimes the sound will change tone. Using TI tool to debug AGL online can produce sound normally.
2. Change the DVDD power supply of TAS5825M to BAT power supply, some boards have a lower probability of modulation variation, and some boards have a higher probability of modulation variation
3. The Bluetooth software modifs the timing of I2s and 5825M power-on, adding some delay, which is a little useful for some boards, and the probability of some boards will be higher
4. Use the logic analyzer to read out the I2c parameters of variable tone and invariant tone respectively. The comparison data is the same, and there is no I2c communication error
5. The I2s signal is optimized with resistance and capacitance waveform, and the output format of I2s is also fully composite standard, but there will still be modulation
6. Compare the parameters with AGL on and without AGL on. It is found that the value of register 0x68 in PAGE 0x0e of Book 0x8c for the two sets of parameters is the difference between 0x40(without AGL on) and 0xc0(with AGL on). So it seems that only the differences in this register will be analyzed further. So what does this 0x68 register do when it's set to 1.1 sound output
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