boards/nucleo-f091rc: configure and use DMA

boards/nucleo-f091rc/Makefile.dep

+FEATURES_REQUIRED += periph_dma
+
 include $(RIOTBOARD)/common/nucleo/Makefile.dep

boards/nucleo-f091rc/Makefile.features

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

boards/nucleo-f091rc/include/periph_conf.h

@@ -56,6 +56,22 @@ extern "C" {
 #define CLOCK_PLL_MUL        (6)
 /** @} */
 
+/**
+ * @name    DMA streams configuration
+ * @{
+ */
+#ifdef MODULE_PERIPH_DMA
+static const dma_conf_t dma_config[] = {
+    { .stream = 1  },
+    { .stream = 2  },
+};
+
+#define DMA_SHARED_ISR_0            isr_dma1_ch2_3_dma2_ch1_2
+#define DMA_SHARED_ISR_0_STREAMS    { 0, 1 } /* Indexes 0 and 1 of dma_config share the same isr */
+
+#define DMA_NUMOF           (sizeof(dma_config) / sizeof(dma_config[0]))
+#endif
+
 /**
  * @name   Timer configuration
  * @{
@@ -88,7 +104,11 @@ static const uart_conf_t uart_config[] = {
         .rx_af      = GPIO_AF1,
         .tx_af      = GPIO_AF1,
         .bus        = APB1,
-        .irqn       = USART2_IRQn
+        .irqn       = USART2_IRQn,
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 0,
+        .dma_chan   = 0x9,
+#endif
     },
     {
         .dev        = USART1,
@@ -98,7 +118,11 @@ static const uart_conf_t uart_config[] = {
         .rx_af      = GPIO_AF1,
         .tx_af      = GPIO_AF1,
         .bus        = APB2,
-        .irqn       = USART1_IRQn
+        .irqn       = USART1_IRQn,
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 0,
+        .dma_chan   = 0x8,
+#endif
     },
     {
         .dev        = USART3,
@@ -108,7 +132,11 @@ static const uart_conf_t uart_config[] = {
         .rx_af      = GPIO_AF1,
         .tx_af      = GPIO_AF1,
         .bus        = APB1,
-        .irqn       = USART3_8_IRQn
+        .irqn       = USART3_8_IRQn,
+#ifdef MODULE_PERIPH_DMA
+        .dma        = 0,
+        .dma_chan   = 0xA,
+#endif
     },
 };
 
@@ -153,7 +181,13 @@ static const spi_conf_t spi_config[] = {
         .cs_pin   = GPIO_PIN(PORT_B, 6),
         .af       = GPIO_AF0,
         .rccmask  = RCC_APB2ENR_SPI1EN,
-        .apbbus   = APB2
+        .apbbus   = APB2,
+#ifdef MODULE_PERIPH_DMA
+        .tx_dma   = 1,
+        .tx_dma_chan = 0,
+        .rx_dma   = 0,
+        .rx_dma_chan = 0,
+#endif
     }
 };