Add GPIO api

libraries/mbed/vendor/STM/capi/gpio_api.c

@@ -0,0 +1,59 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "gpio_api.h"
+#include "pinmap.h"
+
+uint32_t gpio_set(PinName pin) {
+    uint32_t port_index = (uint32_t) pin >> 4;
+
+    // Enable GPIO peripheral clock
+    RCC_APB1ENR |= 1 << port_index;
+
+    pin_function(pin, 0);
+    return 1 << ((uint32_t) pin & 0xF);
+}
+
+void gpio_init(gpio_t *obj, PinName pin, PinDirection direction) {
+    if(pin == NC) return;
+
+    obj->pin = pin;
+    obj->mask = gpio_set(pin);
+
+    GPIO_TypeDef *port = (GPIO_TypeDef *) (GPIOA_BASE + port_index << 6);
+    obj->reg_mode = &port_reg->MODER;
+    obj->reg_set = &port_reg->BSSRH;
+    obj->reg_clr = &port_reg->BSSRL;
+    obj->reg_in  = &port_reg->IDR;
+
+
+    gpio_dir(obj, direction);
+
+    switch (direction) {
+        case PIN_OUTPUT: pin_mode(pin, PullNone); break;
+        case PIN_INPUT : pin_mode(pin, PullDown); break;
+    }
+}
+
+void gpio_mode(gpio_t *obj, PinMode mode) {
+    pin_mode(obj->pin, mode);
+}
+
+void gpio_dir(gpio_t *obj, PinDirection direction) {
+    switch (direction) {
+        case PIN_INPUT : pin_function(pin, 0); break;
+        case PIN_OUTPUT: pin_function(pin, 1); break;
+    }
+}