Move I2S management to application side.

firmware/baseband/Makefile

@@ -154,7 +154,6 @@ CPPSRC = main.cpp \
          rssi.cpp \
          rssi_dma.cpp \
          rssi_thread.cpp \
-         audio.cpp \
          audio_output.cpp \
          audio_dma.cpp \
          audio_stats_collector.cpp \

firmware/baseband/audio_dma.hpp

@@ -24,9 +24,22 @@
 
 #include <cstdint>
 
-#include "audio.hpp"
+#include "buffer.hpp"
 
 namespace audio {
+
+struct sample_t {
+	union {
+		struct {
+			int16_t left;
+			int16_t right;
+		};
+		uint32_t raw;
+	};
+};
+
+using buffer_t = buffer_t<sample_t>;
+
 namespace dma {
 
 void init();

firmware/baseband/audio_output.cpp

@@ -77,10 +77,7 @@ void AudioOutput::on_block(
 	audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
 	const bool audio_present = (audio_present_history != 0);
 	
-	if( audio_present ) {
-		i2s::i2s0::tx_unmute();
-	} else {
-		i2s::i2s0::tx_mute();
+	if( !audio_present ) {
 		for(size_t i=0; i<audio.count; i++) {
 			audio.p[i] = 0;
 		}

firmware/baseband/main.cpp

@@ -42,7 +42,6 @@
 
 #include "debug.hpp"
 
-#include "audio.hpp"
 #include "audio_dma.hpp"
 
 #include "gcc.hpp"
@@ -73,19 +72,10 @@ void __late_init(void) {
 }
 
 static void init() {
-	i2s::i2s0::configure(
-		audio::i2s0_config_tx,
-		audio::i2s0_config_rx,
-		audio::i2s0_config_dma
-	);
-
 	audio::dma::init();
 	audio::dma::configure();
 	audio::dma::enable();
 
-	i2s::i2s0::tx_start();
-	i2s::i2s0::rx_start();
-
 	LPC_CREG->DMAMUX = portapack::gpdma_mux;
 	gpdma::controller.enable();
 	nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));