Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NXP/TARGET_LPC408X/pinmap.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "mbed_assert.h"
elessair 0:f269e3021894 17 #include "pinmap.h"
elessair 0:f269e3021894 18 #include "mbed_error.h"
elessair 0:f269e3021894 19
elessair 0:f269e3021894 20 void pin_function(PinName pin, int function) {
elessair 0:f269e3021894 21 MBED_ASSERT(pin != (PinName)NC);
elessair 0:f269e3021894 22 __IO uint32_t *reg = (__IO uint32_t*) (LPC_IOCON_BASE + 4 * pin);
elessair 0:f269e3021894 23
elessair 0:f269e3021894 24 // pin function bits: [2:0] -> 111 = (0x7)
elessair 0:f269e3021894 25 *reg = (*reg & ~0x7) | (function & 0x7);
elessair 0:f269e3021894 26 }
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 void pin_mode(PinName pin, PinMode mode) {
elessair 0:f269e3021894 29 MBED_ASSERT(pin != (PinName)NC);
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 uint32_t drain = ((uint32_t) mode & (uint32_t) OpenDrain) >> 2;
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 __IO uint32_t *reg = (__IO uint32_t*) (LPC_IOCON_BASE + 4 * pin);
elessair 0:f269e3021894 34 uint32_t tmp = *reg;
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 // pin mode bits: [4:3] -> 11000 = (0x3 << 3)
elessair 0:f269e3021894 37 tmp &= ~(0x3 << 3);
elessair 0:f269e3021894 38 tmp |= (mode & 0x3) << 3;
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 // drain
elessair 0:f269e3021894 41 tmp &= ~(0x1 << 10);
elessair 0:f269e3021894 42 tmp |= drain << 10;
elessair 0:f269e3021894 43
elessair 0:f269e3021894 44 *reg = tmp;
elessair 0:f269e3021894 45 }