board: f411re: modify for working with mic shields in stereo mode

This commit is provided to make the sample working, but should be
somehow replaced.

Signed-off-by: Armando Visconti <[email protected]>

Author: avisconti

boards/arm/nucleo_f411re/Kconfig.defconfig

@@ -34,4 +34,37 @@ config SPI_STM32_INTERRUPT
 
 endif # SPI
 
+if I2S
+
+config I2S_STM32
+	default y
+
+# configure PLLI2S to generate a I2SxCLK=128MHz
+config I2S_STM32_USE_PLLI2S_ENABLE
+	default y
+
+config I2S_STM32_PLLI2S_PLLM
+	default 8
+
+config I2S_STM32_PLLI2S_PLLN
+	default 192
+
+config I2S_STM32_PLLI2S_PLLR
+	default 3
+
+config I2S_1
+	default y
+
+config USE_STM32_LL_TIM
+	default y
+
+endif # I2S
+
+if DMA
+
+config DMA_STM32F4X
+	default y
+
+endif # DMA
+
 endif # BOARD_NUCLEO_F411RE

boards/arm/nucleo_f411re/nucleo_f411re.dts

@@ -71,6 +71,14 @@ arduino_spi: &spi1 {
 	status = "okay";
 };
 
+arduino_i2s: &i2s1 {
+	status = "ok";
+};
+
+&timers3 {
+	status = "ok";
+};
+
 &rtc {
 	status = "okay";
 };

boards/arm/nucleo_f411re/pinmux.c

@@ -40,6 +40,14 @@ static const struct pin_config pinconf[] = {
 	{STM32_PIN_PA6, STM32F4_PINMUX_FUNC_PA6_SPI1_MISO},
 	{STM32_PIN_PA7, STM32F4_PINMUX_FUNC_PA7_SPI1_MOSI},
 #endif	/* CONFIG_SPI_1 */
+#ifdef CONFIG_I2S_1
+	{STM32_PIN_PA4, STM32F4_PINMUX_FUNC_PA4_I2S1_WS},
+	{STM32_PIN_PA5, STM32F4_PINMUX_FUNC_PA5_I2S1_CK},
+	{STM32_PIN_PA7, STM32F4_PINMUX_FUNC_PA7_I2S1_SD},
+#endif	/* CONFIG_I2S_1 */
+	/* TBD ???? */
+	{STM32_PIN_PB4, (STM32_PINMUX_ALT_FUNC_2 | STM32_PUSHPULL_NOPULL | STM32_OSPEEDR_VERY_HIGH_SPEED)},
+	{STM32_PIN_PB5, (STM32_PINMUX_ALT_FUNC_2 | STM32_PUSHPULL_NOPULL | STM32_OSPEEDR_VERY_HIGH_SPEED)},
 };
 
 static int pinmux_stm32_init(struct device *port)