boards/b-l475e-iot01a: configure and use DMA

boards/b-l475e-iot01a/Makefile.dep

+FEATURES_REQUIRED += periph_dma
+
 ifneq (,$(filter saul_default,$(USEMODULE)))
   USEMODULE += saul_gpio
   USEMODULE += hts221

boards/b-l475e-iot01a/Makefile.features

 # Put defined MCU peripherals here (in alphabetical order)
+FEATURES_PROVIDED += periph_dma
 FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_pwm
 FEATURES_PROVIDED += periph_spi

boards/b-l475e-iot01a/include/periph_conf.h

@@ -69,6 +69,27 @@ extern "C" {
 #define CLOCK_APB2          (CLOCK_CORECLOCK / 2)
 /** @} */
 
+/**
+ * @name    DMA streams configuration
+ * @{
+ */
+#ifdef MODULE_PERIPH_DMA
+static const dma_conf_t dma_config[] = {
+    { .stream = 1 },    /* DMA1 Channel 2 - SPI1_RX */
+    { .stream = 2 },    /* DMA1 Channel 3 - SPI1_TX */
+    { .stream = 3 },    /* DMA1 Channel 4 - USART1_TX */
+    { .stream = 10 },   /* DMA2 Channel 3 - UART4_TX */
+};
+
+#define DMA_0_ISR  isr_dma1_channel2
+#define DMA_1_ISR  isr_dma1_channel3
+#define DMA_2_ISR  isr_dma1_channel4
+#define DMA_3_ISR  isr_dma2_channel3
+
+#define DMA_NUMOF           (sizeof(dma_config) / sizeof(dma_config[0]))
+#endif
+/** @} */
+
 /**
  * @name    Timer configuration
  * @{
@@ -104,9 +125,9 @@ static const uart_conf_t uart_config[] = {
         .irqn       = USART1_IRQn,
         .type       = STM32_USART,
         .clk_src    = 0, /* Use APB clock */
-#ifdef UART_USE_DMA
-        .dma_stream = 6,
-        .dma_chan   = 4
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 2,
+        .dma_chan   = 2
 #endif
     },
     {
@@ -120,9 +141,9 @@ static const uart_conf_t uart_config[] = {
         .irqn       = UART4_IRQn,
         .type       = STM32_USART,
         .clk_src    = 0, /* Use APB clock */
-#ifdef UART_USE_DMA
-        .dma_stream = 5,
-        .dma_chan   = 4
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 3,
+        .dma_chan   = 2
 #endif
     }
 };
@@ -186,7 +207,13 @@ static const spi_conf_t spi_config[] = {
         .cs_pin   = GPIO_UNDEF,
         .af       = GPIO_AF5,
         .rccmask  = RCC_APB2ENR_SPI1EN,
-        .apbbus   = APB2
+        .apbbus   = APB2,
+#ifdef MODULE_PERIPH_DMA
+        .tx_dma   = 1,
+        .tx_dma_chan = 1,
+        .rx_dma   = 0,
+        .rx_dma_chan = 1,
+#endif
     }
 };