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/* 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 "mbed_assert.h"
#include "pinmap.h"
#include "mbed_error.h"
#define LPC_IOCON0_BASE (LPC_IOCON_BASE)
#define LPC_IOCON1_BASE (LPC_IOCON_BASE + 0x60)
void pin_function(PinName pin, int function) {
MBED_ASSERT(pin != (PinName)NC);
if (pin == (PinName)NC) return;
uint32_t pin_number = (uint32_t)pin;
__IO uint32_t *reg = (pin_number < 32) ?
(__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) :
(__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32));
// pin function bits: [2:0] -> 111 = (0x7)
*reg = (*reg & ~0x7) | (function & 0x7);
}
void pin_mode(PinName pin, PinMode mode) {
MBED_ASSERT(pin != (PinName)NC);
uint32_t pin_number = (uint32_t)pin;
uint32_t drain = ((uint32_t) mode & (uint32_t) OpenDrain) >> 2;
__IO uint32_t *reg = (pin_number < 32) ?
(__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) :
(__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32));
uint32_t tmp = *reg;
// pin mode bits: [4:3] -> 11000 = (0x3 << 3)
tmp &= ~(0x3 << 3);
tmp |= (mode & 0x3) << 3;
// drain
tmp &= ~(0x1 << 10);
tmp |= drain << 10;
*reg = tmp;
}
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