boards/nucleo-f072: add extra UART

boards/nucleo-f072/include/periph_conf.h

@@ -95,17 +95,28 @@ static const uart_conf_t uart_config[] = {
     {
         .dev      = USART1,
         .rcc_mask = RCC_APB2ENR_USART1EN,
-        .rx_pin   = GPIO_PIN(PORT_B, 7),
-        .tx_pin   = GPIO_PIN(PORT_B, 6),
-        .rx_af    = GPIO_AF0,
-        .tx_af    = GPIO_AF0,
+        .rx_pin   = GPIO_PIN(PORT_A, 10),
+        .tx_pin   = GPIO_PIN(PORT_A, 9),
+        .rx_af    = GPIO_AF1,
+        .tx_af    = GPIO_AF1,
         .bus      = APB2,
         .irqn     = USART1_IRQn
+    },
+    {
+        .dev      = USART3,
+        .rcc_mask = RCC_APB1ENR_USART3EN,
+        .rx_pin   = GPIO_PIN(PORT_C, 11),
+        .tx_pin   = GPIO_PIN(PORT_C, 10),
+        .rx_af    = GPIO_AF1,
+        .tx_af    = GPIO_AF1,
+        .bus      = APB1,
+        .irqn     = USART3_8_IRQn
     }
 };
 
 #define UART_0_ISR          (isr_usart2)
 #define UART_1_ISR          (isr_usart1)
+#define UART_2_ISR          (isr_usart3_8)
 
 #define UART_NUMOF          (sizeof(uart_config) / sizeof(uart_config[0]))
 /** @} */