Start audio DMA only in apps that use audio (#1982)

* Start audio DMA only in apps that use audio
* Rename main.cpp to main.cpp.unuse
* shrink_tx_buffer fix for transfers_per_buffer==1 scenario

firmware/baseband/audio_dma.cpp

@@ -162,14 +162,6 @@ static void rx_error() {
     disable();
 }
 
-void init() {
-    gpdma_channel_i2s0_tx.set_handlers(tx_transfer_complete, tx_error);
-    gpdma_channel_i2s0_rx.set_handlers(rx_transfer_complete, rx_error);
-
-    // LPC_GPDMA->SYNC |= (1 << gpdma_rx_peripheral);
-    // LPC_GPDMA->SYNC |= (1 << gpdma_tx_peripheral);
-}
-
 static void configure_tx() {
     const auto peripheral = reinterpret_cast<uint32_t>(&LPC_I2S0->TXFIFO);
     const auto control_value = control_tx(transfer_bytes);
@@ -194,22 +186,34 @@ static void configure_rx() {
     }
 }
 
-void configure() {
-    configure_tx();
-    configure_rx();
+static void enable_tx() {
+    const auto gpdma_config_tx = config_tx();
+    gpdma_channel_i2s0_tx.configure(lli_tx_loop[0], gpdma_config_tx);
+    gpdma_channel_i2s0_tx.enable();
 }
 
-void enable() {
-    const auto gpdma_config_tx = config_tx();
+static void enable_rx() {
     const auto gpdma_config_rx = config_rx();
-
-    gpdma_channel_i2s0_tx.configure(lli_tx_loop[0], gpdma_config_tx);
     gpdma_channel_i2s0_rx.configure(lli_rx_loop[0], gpdma_config_rx);
-
-    gpdma_channel_i2s0_tx.enable();
     gpdma_channel_i2s0_rx.enable();
 }
 
+void init_audio_out() {
+    gpdma_channel_i2s0_tx.set_handlers(tx_transfer_complete, tx_error);
+    // LPC_GPDMA->SYNC |= (1 << gpdma_tx_peripheral);
+    configure_tx();
+    enable_tx();
+    nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
+}
+
+void init_audio_in() {
+    gpdma_channel_i2s0_rx.set_handlers(rx_transfer_complete, rx_error);
+    // LPC_GPDMA->SYNC |= (1 << gpdma_rx_peripheral);
+    configure_rx();
+    enable_rx();
+    nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
+}
+
 void disable() {
     gpdma_channel_i2s0_tx.disable();
     gpdma_channel_i2s0_rx.disable();
@@ -217,6 +221,10 @@ void disable() {
 
 void shrink_tx_buffer(bool shrink) {
     single_tx_buffer = shrink;
+
+    if (transfers_per_buffer == 1)
+        return;
+
     if (single_tx_buffer)
         lli_tx_loop[0].lli = lli_pointer(&lli_tx_loop[0]);
     else

firmware/baseband/audio_dma.hpp

@@ -43,9 +43,8 @@ using buffer_t = buffer_t<sample_t>;
 
 namespace dma {
 
-void init();
-void configure();
-void enable();
+void init_audio_in();
+void init_audio_out();
 void disable();
 void shrink_tx_buffer(bool shrink);
 

firmware/baseband/baseband.cpp

@@ -28,14 +28,8 @@
 
 #include "gpdma.hpp"
 
-#include "audio_dma.hpp"
-
 static void init() {
-    audio::dma::init();
-    audio::dma::configure();
-    audio::dma::enable();
-
-    nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
+    // Audio DMA initialization was moved to baseband proc's that actually use DMA audio, to save memory.
 }
 
 static void halt() {

firmware/baseband/proc_afskrx.cpp

@@ -23,6 +23,8 @@
 #include "proc_afskrx.hpp"
 #include "portapack_shared_memory.hpp"
 
+#include "audio_dma.hpp"
+
 #include "event_m4.hpp"
 
 void AFSKRxProcessor::execute(const buffer_c8_t& buffer) {
@@ -181,6 +183,8 @@ void AFSKRxProcessor::configure(const AFSKRxConfigureMessage& message) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<AFSKRxProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_am_audio.cpp

@@ -22,6 +22,7 @@
 #include "proc_am_audio.hpp"
 
 #include "audio_output.hpp"
+#include "audio_dma.hpp"
 
 #include "event_m4.hpp"
 
@@ -112,6 +113,8 @@ void NarrowbandAMAudio::capture_config(const CaptureConfigMessage& message) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<NarrowbandAMAudio>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_aprsrx.cpp

@@ -23,6 +23,8 @@
 #include "proc_aprsrx.hpp"
 #include "portapack_shared_memory.hpp"
 
+#include "audio_dma.hpp"
+
 #include "event_m4.hpp"
 
 #include "stdio.h"
@@ -244,6 +246,8 @@ void APRSRxProcessor::configure(const APRSRxConfigureMessage& message) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<APRSRxProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_audiotx.cpp

@@ -24,6 +24,7 @@
 #include "portapack_shared_memory.hpp"
 #include "sine_table_int8.hpp"
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <cstdint>
 
@@ -139,6 +140,8 @@ void AudioTXProcessor::sample_rate_config(const SampleRateConfigMessage& message
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<AudioTXProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_mictx.cpp

@@ -25,6 +25,7 @@
 #include "sine_table_int8.hpp"
 #include "tonesets.hpp"
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <cstdint>
 
@@ -167,6 +168,8 @@ void MicTXProcessor::on_message(const Message* const msg) {
 }
 
 int main() {
+    audio::dma::init_audio_in();
+
     EventDispatcher event_dispatcher{std::make_unique<MicTXProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_nfm_audio.cpp

@@ -24,6 +24,8 @@
 #include "sine_table_int8.hpp"
 #include "portapack_shared_memory.hpp"
 
+#include "audio_dma.hpp"
+
 #include "event_m4.hpp"
 
 #include <cstdint>
@@ -174,6 +176,8 @@ void NarrowbandFMAudio::capture_config(const CaptureConfigMessage& message) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<NarrowbandFMAudio>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_pocsag.cpp

@@ -27,6 +27,7 @@
 
 #include "dsp_iir_config.hpp"
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <algorithm>
 #include <cmath>
@@ -530,6 +531,8 @@ uint32_t POCSAGProcessor::getRate() const {
 //
 // ====================================================================
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<POCSAGProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_pocsag2.cpp

@@ -26,6 +26,7 @@
 #include "proc_pocsag2.hpp"
 
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <algorithm>
 #include <cmath>
@@ -416,6 +417,8 @@ void POCSAGProcessor::send_packet() {
 /* main **************************************************/
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<POCSAGProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_sonde.cpp

@@ -27,6 +27,7 @@
 #include "event_m4.hpp"
 
 #include "audio_output.hpp"
+#include "audio_dma.hpp"
 
 SondeProcessor::SondeProcessor() {
     decim_0.configure(taps_11k0_decim_0.taps);
@@ -141,6 +142,8 @@ void SondeProcessor::pitch_rssi_config(const PitchRSSIConfigureMessage& message)
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<SondeProcessor>()};
     event_dispatcher.run();
 

firmware/baseband/proc_tones.cpp

@@ -23,6 +23,7 @@
 #include "proc_tones.hpp"
 #include "sine_table_int8.hpp"
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <cstdint>
 
@@ -154,6 +155,8 @@ void TonesProcessor::on_message(const Message* const p) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<TonesProcessor>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_wfm_audio.cpp

@@ -26,6 +26,7 @@
 #include "audio_output.hpp"
 #include "dsp_fft.hpp"
 #include "event_m4.hpp"
+#include "audio_dma.hpp"
 
 #include <cstdint>
 
@@ -188,6 +189,8 @@ void WidebandFMAudio::capture_config(const CaptureConfigMessage& message) {
 }
 
 int main() {
+    audio::dma::init_audio_out();
+
     EventDispatcher event_dispatcher{std::make_unique<WidebandFMAudio>()};
     event_dispatcher.run();
     return 0;

firmware/baseband/proc_wideband_spectrum.cpp

@@ -20,6 +20,7 @@
  */
 
 #include "proc_wideband_spectrum.hpp"
+#include "audio_dma.hpp"
 
 #include "event_m4.hpp"
 
@@ -82,6 +83,8 @@ void WidebandSpectrum::on_message(const Message* const msg) {
 }
 
 int main() {
+    audio::dma::init_audio_out();  // for AudioRX app (enables audio output while this baseband image is running)
+
     EventDispatcher event_dispatcher{std::make_unique<WidebandSpectrum>()};
     event_dispatcher.run();
     return 0;