boards/nucleo-l1: adapted UART configuration

boards/nucleo-l1/include/periph_conf.h

@@ -72,11 +72,9 @@ static const timer_conf_t timer_config[] = {
 #define UART_0_ISR          isr_usart2
 #define UART_0_BUS_FREQ     32000000
 /* UART 0 pin configuration */
-#define UART_0_PORT         GPIOA
-#define UART_0_PORT_CLKEN() (RCC->AHBENR |= RCC_AHBENR_GPIOAEN)
-#define UART_0_RX_PIN       3
-#define UART_0_TX_PIN       2
-#define UART_0_AF           7
+#define UART_0_RX_PIN       GPIO(PORT_A, 3)
+#define UART_0_TX_PIN       GPIO(PORT_A, 2)
+#define UART_0_AF           GPIO_AF7
 
 /**
  * @brief GPIO configuration

cpu/stm32l1/include/periph_cpu.h

@@ -81,7 +81,6 @@ typedef enum {
 } gpio_af_t;
 
 /**
- 
  * @brief   Configure the alternate function for the given pin
  *
  * @note    This is meant for internal use in STM32L1 peripheral drivers only

cpu/stm32l1/periph/uart.c

@@ -99,7 +99,6 @@ int uart_init_blocking(uart_t uart, uint32_t baudrate)
     gpio_t rx_pin = 0;
     gpio_af_t af = 0;
     float clk = 0;
-    float divider;
     uint16_t mantissa;
     uint8_t fraction;