Add untested port api

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

@@ -0,0 +1,67 @@
+/* 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 "port_api.h"
+#include "pinmap.h"
+#include "gpio_api.h"
+
+#if DEVICE_PORTIN || DEVICE_PORTOUT
+
+PinName port_pin(PortName port, int pin_n) {
+    return pin_n + (port << 4);
+}
+
+void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
+    obj->port = port;
+    obj->mask = mask;
+
+    int port_index = (uint32_t) pin >> 4;
+
+    GPIO_TypeDef *port_reg = (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;
+
+    port_dir(obj, dir);
+}
+
+void port_mode(port_t *obj, PinMode mode) {
+    uint32_t i;
+    // The mode is set per pin: reuse pinmap logic
+    for (i=0; i<16; i++) {
+        if (obj->mask & (1<<i)) {
+            pin_mode(port_pin(obj->port, i), mode);
+        }
+    }
+}
+
+void port_dir(port_t *obj, PinDirection dir) {
+    switch (dir) {
+        case PIN_INPUT : *obj->reg_mode &= ~obj->mask; break;
+        case PIN_OUTPUT: *obj->reg_mode |=  obj->mask; break;
+    }
+}
+
+void port_write(port_t *obj, int value) {
+    *obj->reg_out = (*obj->reg_in & ~obj->mask) | (value & obj->mask);
+}
+
+int port_read(port_t *obj) {
+    return (*obj->reg_in & obj->mask);
+}
+
+#endif