1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 PinName port_pin(PortName port, int pin_n) {
21 return (PinName)(LPC_GPIO0_BASE + ((port << PORT_SHIFT) | pin_n));
24 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
28 LPC_GPIO_TypeDef *port_reg = (LPC_GPIO_TypeDef *)(LPC_GPIO0_BASE + ((int)port * 0x20));
30 // Do not use masking, because it prevents the use of the unmasked pins
31 // port_reg->FIOMASK = ~mask;
33 obj->reg_out = &port_reg->FIOPIN;
34 obj->reg_in = &port_reg->FIOPIN;
35 obj->reg_dir = &port_reg->FIODIR;
38 // The function is set per pin: reuse gpio logic
39 for (i=0; i<32; i++) {
40 if (obj->mask & (1<<i)) {
41 gpio_set(port_pin(obj->port, i));
48 void port_mode(port_t *obj, PinMode mode) {
50 // The mode is set per pin: reuse pinmap logic
51 for (i=0; i<32; i++) {
52 if (obj->mask & (1<<i)) {
53 pin_mode(port_pin(obj->port, i), mode);
58 void port_dir(port_t *obj, PinDirection dir) {
60 case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
61 case PIN_OUTPUT: *obj->reg_dir |= obj->mask; break;
65 void port_write(port_t *obj, int value) {
66 *obj->reg_out = (*obj->reg_in & ~obj->mask) | (value & obj->mask);
69 int port_read(port_t *obj) {
70 return (*obj->reg_in & obj->mask);