Import Mbed OS hard-float snapshot

targets/TARGET_NXP/TARGET_LPC176X/port_api.c

@@ -0,0 +1,71 @@
+/* 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"
+
+PinName port_pin(PortName port, int pin_n) {
+    return (PinName)(LPC_GPIO0_BASE + ((port << PORT_SHIFT) | pin_n));
+}
+
+void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
+    obj->port = port;
+    obj->mask = mask;
+    
+    LPC_GPIO_TypeDef *port_reg = (LPC_GPIO_TypeDef *)(LPC_GPIO0_BASE + ((int)port * 0x20));
+    
+    // Do not use masking, because it prevents the use of the unmasked pins
+    // port_reg->FIOMASK = ~mask;
+    
+    obj->reg_out = &port_reg->FIOPIN;
+    obj->reg_in  = &port_reg->FIOPIN;
+    obj->reg_dir  = &port_reg->FIODIR;
+    
+    uint32_t i;
+    // The function is set per pin: reuse gpio logic
+    for (i=0; i<32; i++) {
+        if (obj->mask & (1<<i)) {
+            gpio_set(port_pin(obj->port, i));
+        }
+    }
+
+    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<32; 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_dir &= ~obj->mask; break;
+        case PIN_OUTPUT: *obj->reg_dir |=  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);
+}