boards/b-l072z-lrwan1: configure and use DMA

boards/b-l072z-lrwan1/Makefile.dep

+FEATURES_REQUIRED += periph_dma
+
 ifneq (,$(filter netdev_default,$(USEMODULE)))
   USEMODULE += sx1276
 endif

boards/b-l072z-lrwan1/Makefile.features

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

boards/b-l072z-lrwan1/include/periph_conf.h

@@ -49,6 +49,28 @@ extern "C" {
 #define CLOCK_APB1          (CLOCK_CORECLOCK / 1)
 /** @} */
 
+/**
+ * @name    DMA streams configuration
+ * @{
+ */
+#ifdef MODULE_PERIPH_DMA
+static const dma_conf_t dma_config[] = {
+    { .stream = 1  }, /* channel 2 */
+    { .stream = 2  }, /* channel 3 */
+    { .stream = 3  }, /* channel 4 */
+    { .stream = 4  }, /* channel 5 */
+    { .stream = 5  }, /* channel 6 */
+};
+
+#define DMA_SHARED_ISR_0            isr_dma1_channel2_3
+#define DMA_SHARED_ISR_0_STREAMS    { 0, 1 } /* Indexes 0 and 1 of dma_config share the same isr */
+#define DMA_SHARED_ISR_1            isr_dma1_channel4_5_6_7
+#define DMA_SHARED_ISR_1_STREAMS    { 2, 3, 4 } /* Indexes 2, 3 and 4 of dma_config share the same isr */
+
+#define DMA_NUMOF           (sizeof(dma_config) / sizeof(dma_config[0]))
+#endif
+/** @} */
+
 /**
  * @name    Timer configuration
  * @{
@@ -84,6 +106,10 @@ static const uart_conf_t uart_config[] = {
         .irqn       = USART2_IRQn,
         .type       = STM32_USART,
         .clk_src    = 0, /* Use APB clock */
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 2,
+        .dma_chan   = 4,
+#endif
     },
     {
         .dev        = USART1,
@@ -96,6 +122,10 @@ static const uart_conf_t uart_config[] = {
         .irqn       = USART1_IRQn,
         .type       = STM32_USART,
         .clk_src    = 0, /* Use APB clock */
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 0,
+        .dma_chan   = 3,
+#endif
     },
 };
 
@@ -138,7 +168,13 @@ static const spi_conf_t spi_config[] = {
         .cs_pin   = GPIO_UNDEF,
         .af       = GPIO_AF0,
         .rccmask  = RCC_APB1ENR_SPI2EN,
-        .apbbus   = APB1
+        .apbbus   = APB1,
+#ifdef MODULE_PERIPH_DMA
+        .tx_dma   = 3,
+        .tx_dma_chan = 2,
+        .rx_dma   = 2,
+        .rx_dma_chan = 2,
+#endif
     },
     {
         .dev      = SPI1, /* connected to SX1276 */
@@ -148,7 +184,13 @@ static const spi_conf_t spi_config[] = {
         .cs_pin   = GPIO_UNDEF,
         .af       = GPIO_AF0,
         .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
     },
 };