mirror of https://github.com/ARMmbed/mbed-os.git
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* 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"
|
|
|
|
void pin_function(PinName pin, int function) {
|
|
MBED_ASSERT(pin != (PinName)NC);
|
|
__IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + (pin & 0x1FF));
|
|
|
|
// pin function bits: [2:0] -> 111 = (0x7)
|
|
*reg = (*reg & ~0x7) | (function & 0x7);
|
|
}
|
|
|
|
void pin_mode(PinName pin, PinMode mode) {
|
|
MBED_ASSERT(pin != (PinName)NC);
|
|
if ((pin == P0_4) || (pin == P0_5)) {
|
|
// The true open-drain pins PIO0_4 and PIO0_5 can be configured for different I2C-bus speeds.
|
|
return;
|
|
}
|
|
|
|
__IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + (pin & 0x1FF));
|
|
|
|
if (mode == OpenDrain) {
|
|
*reg |= (1 << 10);
|
|
} else {
|
|
uint32_t tmp = *reg;
|
|
tmp &= ~(0x3 << 3);
|
|
tmp |= (mode & 0x3) << 3;
|
|
*reg = tmp;
|
|
}
|
|
}
|