port_api.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "port_api.h"
00017 #include "pinmap.h"
00018 #include "gpio_api.h"
00019 
00020 PinName port_pin(PortName port, int pin_n) {
00021     return (PinName)((port << PORT_SHIFT) | (pin_n << 2));
00022 }
00023 
00024 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
00025     obj->port = port;
00026     obj->mask = mask;
00027 
00028     FGPIO_Type *reg = (FGPIO_Type *)(FPTA_BASE + port * 0x40);
00029 
00030     obj->reg_out = &reg->PDOR;
00031     obj->reg_in  = &reg->PDIR;
00032     obj->reg_dir = &reg->PDDR;
00033 
00034     uint32_t i;
00035     // The function is set per pin: reuse gpio logic
00036     for (i=0; i<32; i++) {
00037         if (obj->mask & (1<<i)) {
00038             gpio_set(port_pin(obj->port, i));
00039         }
00040     }
00041 
00042     port_dir(obj, dir);
00043 }
00044 
00045 void port_mode(port_t *obj, PinMode mode) {
00046     uint32_t i;
00047     // The mode is set per pin: reuse pinmap logic
00048     for (i=0; i<32; i++) {
00049         if (obj->mask & (1<<i)) {
00050             pin_mode(port_pin(obj->port, i), mode);
00051         }
00052     }
00053 }
00054 
00055 void port_dir(port_t *obj, PinDirection dir) {
00056     switch (dir) {
00057         case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
00058         case PIN_OUTPUT: *obj->reg_dir |=  obj->mask; break;
00059     }
00060 }
00061 
00062 void port_write(port_t *obj, int value) {
00063     *obj->reg_out = (*obj->reg_in & ~obj->mask) | (value & obj->mask);
00064 }
00065 
00066 int port_read(port_t *obj) {
00067     return (*obj->reg_in & obj->mask);
00068 }