fixup: F407-DISCO I2S support

Author: rleh

src/modm/board/disco_f407vg/board.hpp

@@ -18,6 +18,7 @@
 #include <modm/platform.hpp>
 #include <modm/architecture/interface/clock.hpp>
 #include <modm/driver/inertial/lis3dsh.hpp>
+#include <modm/math/units.hpp>
 
 using namespace modm::platform;
 
@@ -148,12 +149,16 @@ using Mclk = GpioOutputC7;	// I2S3_MCK
 using Sclk = GpioOutputC10;	// I2S3_SCK
 using Sdin = GpioOutputC12;	// I2S3_SD
 
+using DmaTx = Dma1::Channel5;
+
 using Reset = GpioOutputD4;	// Audio_RST
 using Scl = GpioB6;			// Audio_SCL
 using Sda = GpioB9;			// Audio_SDA
 
 using I2cMaster = I2cMaster1;
-using I2sMaster = I2sMaster3;
+using I2sMaster = I2sMaster3<DmaTx>;
+
+static constexpr uint8_t I2CAddress = 0x4a; // (0x94 >> 1)
 }
 
 
@@ -201,13 +206,13 @@ initializeLis3()
 	lis3::SpiMaster::setDataMode(lis3::SpiMaster::DataMode::Mode3);
 }
 
-/// not supported yet, due to missing I2S driver
+template< modm::frequency_t samplerate=48_kHz, modm::percent_t tolerance=modm::pct(0.019) >
 inline void
 initializeCs43()
 {
 	cs43::I2sMaster::connect<cs43::Mclk::Mck, cs43::Sclk::Ck,
 							cs43::Lrck::Ws, cs43::Sdin::Sd>();
-	cs43::I2sMaster::initialize<SystemClock, 48_kHz>();
+	cs43::I2sMaster::initialize<SystemClock, samplerate, tolerance>();
 	cs43::Reset::setOutput(modm::Gpio::High);
 
 	cs43::I2cMaster::connect<cs43::Scl::Scl, cs43::Sda::Sda>();
@@ -216,7 +221,7 @@ initializeCs43()
 	cs43::Reset::setOutput(modm::Gpio::Low);
 	modm::delay_ms(2);
 	cs43::Reset::setOutput(modm::Gpio::High);
-	
+
 }
 
 /// not supported yet, due to missing I2S driver

src/modm/board/disco_f407vg/module.lb

@@ -26,8 +26,10 @@ def prepare(module, options):
     module.depends(
         ":architecture:clock",
         ":driver:lis3dsh",
+        ":driver:cs43l22",
         ":platform:clock",
         ":platform:core",
+        ":platform:dma",
         ":platform:gpio",
         ":platform:i2c:1",
         ":platform:spi:1",