cpu/stm32f1: modernized the GPIO driver

cpu/stm32f1/include/periph_cpu.h

@@ -19,13 +19,88 @@
 #ifndef PERIPH_CPU_H_
 #define PERIPH_CPU_H_
 
+#include "cpu.h"
 #include "periph/dev_enums.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-/* nothing defined here so far... */
+/**
+ * @brief   Overwrite the default gpio_t type definition
+ * @{
+ */
+#define HAVE_GPIO_T
+typedef uint32_t gpio_t;
+/** @} */
+
+/**
+ * @brief   Definition of a fitting UNDEF value
+ */
+#define GPIO_UNDEF          (0xffffffff)
+
+/**
+ * @brief   Define a CPU specific GPIO pin generator macro
+ */
+#define GPIO(x, y)          ((GPIOA_BASE + (x << 10)) | y)
+
+/**
+ * @brief   Override values for pull register configuration
+ * @{
+ */
+#define HAVE_GPIO_PP_T
+typedef enum {
+    GPIO_NOPULL = 4,        /**< do not use internal pull resistors */
+    GPIO_PULLUP = 9,        /**< enable internal pull-up resistor */
+    GPIO_PULLDOWN = 8       /**< enable internal pull-down resistor */
+} gpio_pp_t;
+/** @} */
+
+/**
+ * @brief   Override flank configuration values
+ * @{
+ */
+#define HAVE_GPIO_FLANK_T
+typedef enum {
+    GPIO_RISING = 1,        /**< emit interrupt on rising flank */
+    GPIO_FALLING = 2,       /**< emit interrupt on falling flank */
+    GPIO_BOTH = 3           /**< emit interrupt on both flanks */
+} gpio_flank_t;
+/** @} */
+
+/**
+ * @brief   Available ports on the STM32F1 family
+ */
+enum {
+    PORT_A = 0,             /**< port A */
+    PORT_B = 1,             /**< port B */
+    PORT_C = 2,             /**< port C */
+    PORT_D = 3,             /**< port D */
+    PORT_E = 4,             /**< port E */
+    PORT_F = 5,             /**< port F */
+    PORT_G = 6,             /**< port G */
+};
+
+/**
+ * @brief   Define alternate function modes
+ *
+ * On this CPU, only the output pins have alternate function modes. The input
+ * pins have to be configured using the default gpio_init() function.
+ */
+typedef enum {
+    GPIO_AF_OUT_PP = 0xb,   /**< alternate function output - push-pull */
+    GPIO_AF_OUT_OD = 0xf,   /**< alternate function output - open-drain */
+} gpio_af_out_t;
+
+/**
+ * @brief   Configure the alternate function for the given pin
+ *
+ * @note    This is meant for internal use in STM32F1 peripheral drivers only
+ *
+ * @param[in] pin       pin to configure
+ * @param[in] af        alternate function to use
+ */
+void gpio_init_af(gpio_t pin, gpio_af_out_t af);
 
 #ifdef __cplusplus
 }

cpu/stm32f1/include/stm32f10x.h

@@ -1009,8 +1009,7 @@ typedef struct
 
 typedef struct
 {
-  __IO uint32_t CRL;
-  __IO uint32_t CRH;
+  __IO uint32_t CR[2];
   __IO uint32_t IDR;
   __IO uint32_t ODR;
   __IO uint32_t BSRR;