Extract LOTS of stuff into an audio API.

Prevent all manner of type and implementation leakage.

firmware/application/audio.cpp

@@ -21,6 +21,154 @@
 
 #include "audio.hpp"
 
+#include "portapack.hpp"
+using portapack::i2c0;
+using portapack::clock_manager;
+
+#include "wm8731.hpp"
+using wolfson::wm8731::WM8731;
+
+#include "i2s.hpp"
+using namespace lpc43xx;
+
 namespace audio {
 
+namespace {
+
+constexpr i2s::ConfigTX i2s0_config_tx {
+	.dao = i2s::DAO {
+		.wordwidth = i2s::WordWidth::Bits16,
+		.mono = 0,
+		.stop = 1,
+		.reset = 0,
+		.ws_sel = 0,
+		.ws_halfperiod = 0x0f,
+		.mute = 1,
+	},
+	.txrate = i2s::MCLKRate {
+		.x_divider = 0,
+		.y_divider = 0,
+	},
+	.txbitrate = i2s::BitRate {
+		.bitrate = 7,
+	},
+	.txmode = i2s::Mode {
+		.clksel = i2s::ClockSelect::BaseAudioClkOrExternalMCLK,
+		.four_pin = 0,
+		.mclk_out_en = 1,
+	},
+};
+
+constexpr i2s::ConfigRX i2s0_config_rx {
+	.dai = i2s::DAI {
+		.wordwidth = i2s::WordWidth::Bits16,
+		.mono = 0,
+		.stop = 1,
+		.reset = 0,
+		.ws_sel = 1,
+		.ws_halfperiod = 0x0f,
+	},
+	.rxrate = i2s::MCLKRate {
+		.x_divider = 0,
+		.y_divider = 0,
+	},
+	.rxbitrate = i2s::BitRate {
+		.bitrate = 7,
+	},
+	.rxmode = i2s::Mode {
+		.clksel = i2s::ClockSelect::BaseAudioClkOrExternalMCLK,
+		.four_pin = 1,
+		.mclk_out_en = 0,
+	},
+};
+
+constexpr i2s::ConfigDMA i2s0_config_dma {
+	.dma1 = i2s::DMA {
+		.rx_enable = 1,
+		.tx_enable = 0,
+		.rx_depth = 4,
+		.tx_depth = 0,
+	},
+	.dma2 = i2s::DMA {
+		.rx_enable = 0,
+		.tx_enable = 1,
+		.rx_depth = 0,
+		.tx_depth = 4,
+	},
+};
+
+constexpr uint8_t wm8731_i2c_address = 0x1a;
+
+WM8731 audio_codec { i2c0, wm8731_i2c_address };
+
+} /* namespace */
+
+namespace output {
+
+void start() {
+	i2s::i2s0::tx_start();
+	unmute();
+}
+
+void stop() {
+	mute();
+	i2s::i2s0::tx_stop();
+}
+
+void mute() {
+	i2s::i2s0::tx_mute();
+
+	audio_codec.headphone_mute();
+}
+
+void unmute() {
+	i2s::i2s0::tx_unmute();
+}
+
+} /* namespace output */
+
+namespace headphone {
+
+volume_range_t volume_range() {
+	return wolfson::wm8731::headphone_gain_range;
+}
+
+void set_volume(const volume_t volume) {
+	audio_codec.set_headphone_volume(volume);
+}
+
+} /* namespace headphone */
+
+namespace debug {
+
+int reg_count() {
+	return wolfson::wm8731::reg_count;
+}
+
+uint16_t reg_read(const int register_number) {
+	return audio_codec.read(register_number);
+}
+
+} /* namespace debug */
+
+void init() {
+	clock_manager.start_audio_pll();
+	audio_codec.init();
+
+	i2s::i2s0::configure(
+		i2s0_config_tx,
+		i2s0_config_rx,
+		i2s0_config_dma
+	);
+}
+
+void shutdown() {
+	audio_codec.reset();
+	output::stop();
+}
+
+void set_rate(const Rate rate) {
+	clock_manager.set_base_audio_clock_divider(toUType(rate));
+}
+
 } /* namespace audio */