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Improve dac startup sequencing to reduce the clicky poppy

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This commit is contained in:
jacqueline
2023-09-05 16:01:05 +10:00
parent 020d42d431
commit a9008884c9
1 changed files with 4 additions and 10 deletions
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src/drivers/i2s_dac.cpp
+4 -10
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@@ -93,22 +93,21 @@ I2SDac::I2SDac(IGpios& gpio, i2s_chan_handle_t i2s_handle)
wm8523::WriteRegister(wm8523::Register::kReset, 1);
vTaskDelay(pdMS_TO_TICKS(10));
wm8523::WriteRegister(wm8523::Register::kPsCtrl, 0b0);
gpio_.WriteSync(IGpios::Pin::kAmplifierEnable, true);
}
I2SDac::~I2SDac() {
Stop();
i2s_del_channel(i2s_handle_);
gpio_.WriteSync(IGpios::Pin::kAmplifierEnable, false);
}
auto I2SDac::Start() -> void {
std::lock_guard<std::mutex> lock(configure_mutex_);
gpio_.WriteSync(IGpios::Pin::kAmplifierUnmute, false);
// Ramp up the amplifier power supply.
gpio_.WriteSync(IGpios::Pin::kAmplifierEnable, true);
// Wait for voltage to stabilise
vTaskDelay(pdMS_TO_TICKS(5));
// Ensure the DAC powers up to a muted state.
wm8523::WriteRegister(wm8523::Register::kPsCtrl, 0b10);
@@ -118,12 +117,7 @@ auto I2SDac::Start() -> void {
i2s_channel_enable(i2s_handle_);
i2s_active_ = true;
// Wait for DAC output lines to stabilise
vTaskDelay(pdMS_TO_TICKS(5));
wm8523::WriteRegister(wm8523::Register::kPsCtrl, 0b11);
vTaskDelay(pdMS_TO_TICKS(5));
gpio_.WriteSync(IGpios::Pin::kAmplifierUnmute, true);
}