From 731b2cfa77a063e98da8fa26acc1e7ed1de8c169 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Thu, 20 Apr 2023 11:25:43 +1000
Subject: working isr-based sink, but still grainy

---
 src/drivers/dac.cpp | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

(limited to 'src/drivers/dac.cpp')

diff --git a/src/drivers/dac.cpp b/src/drivers/dac.cpp
index 0fe75a5e..dc9b51c8 100644
--- a/src/drivers/dac.cpp
+++ b/src/drivers/dac.cpp
@@ -33,7 +33,7 @@ auto AudioDac::create(GpioExpander* expander)
   i2s_chan_handle_t i2s_handle;
   i2s_chan_config_t channel_config =
       I2S_CHANNEL_DEFAULT_CONFIG(kI2SPort, I2S_ROLE_MASTER);
-  channel_config.auto_clear = true;
+  // channel_config.auto_clear = true;
 
   ESP_ERROR_CHECK(i2s_new_channel(&channel_config, &i2s_handle, NULL));
   //
@@ -115,7 +115,7 @@ AudioDac::AudioDac(GpioExpander* gpio, i2s_chan_handle_t i2s_handle)
       i2s_active_(false),
       active_page_(),
       clock_config_(I2S_STD_CLK_DEFAULT_CONFIG(44100)),
-      slot_config_(I2S_STD_MSB_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT,
+      slot_config_(I2S_STD_PHILIPS_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT,
                                                        I2S_SLOT_MODE_STEREO)) {
   clock_config_.clk_src = I2S_CLK_SRC_PLL_160M;
   gpio_->set_pin(GpioExpander::AMP_EN, true);
@@ -192,8 +192,8 @@ auto AudioDac::Reconfigure(BitsPerSample bps, SampleRate rate) -> void {
       bps == BPS_24 ? I2S_MCLK_MULTIPLE_384 : I2S_MCLK_MULTIPLE_256;
   ESP_ERROR_CHECK(i2s_channel_reconfig_std_clock(i2s_handle_, &clock_config_));
 
-  WriteRegister(pcm512x::I2S_1, (0b11 << 4) | bps_bits);
-  WriteRegister(pcm512x::I2S_2, 0);
+  WriteRegister(pcm512x::I2S_1, bps_bits);
+  // WriteRegister(pcm512x::I2S_2, 0);
 
   // Configuration is all done, so we can now bring the DAC and I2S stream back
   // up. I2S first, since otherwise the DAC will see that there's no clocks and
@@ -212,31 +212,35 @@ auto AudioDac::WriteData(const cpp::span<const std::byte>& data) -> void {
   }
 }
 
-IRAM_ATTR auto callback(i2s_chan_handle_t handle, i2s_event_data_t *event, void *user_ctx) -> bool {
+extern "C" IRAM_ATTR auto callback(i2s_chan_handle_t handle,
+                                   i2s_event_data_t* event,
+                                   void* user_ctx) -> bool {
   if (event == nullptr || user_ctx == nullptr) {
     return false;
   }
   if (event->data == nullptr || event->size == 0) {
     return false;
   }
-  StreamBufferHandle_t *src = reinterpret_cast<StreamBufferHandle_t*>(user_ctx);
+  uint8_t** buf = reinterpret_cast<uint8_t**>(event->data);
+  StreamBufferHandle_t src = reinterpret_cast<StreamBufferHandle_t>(user_ctx);
   BaseType_t ret = false;
-  std::size_t bytes_received = xStreamBufferReceiveFromISR(*src, event->data, event->size, &ret);
+  std::size_t bytes_received =
+      xStreamBufferReceiveFromISR(src, *buf, event->size, &ret);
   if (bytes_received < event->size) {
-    // TODO(jacqueline): zero-pad.
+    memset(*buf + bytes_received, 0, event->size - bytes_received);
   }
   return ret;
 }
 
-auto AudioDac::SetSource(StreamBufferHandle_t *buffer) -> void {
+auto AudioDac::SetSource(StreamBufferHandle_t buffer) -> void {
   if (i2s_active_) {
     ESP_ERROR_CHECK(i2s_channel_disable(i2s_handle_));
   }
-  i2s_event_callbacks_t callbacks {
-    .on_recv = NULL,
-    .on_recv_q_ovf = NULL,
-    .on_sent = NULL,
-    .on_send_q_ovf = NULL,
+  i2s_event_callbacks_t callbacks{
+      .on_recv = NULL,
+      .on_recv_q_ovf = NULL,
+      .on_sent = NULL,
+      .on_send_q_ovf = NULL,
   };
   if (buffer != nullptr) {
     callbacks.on_sent = &callback;
-- 
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