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targets/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
File content as of revision 178:c26431f84b0d:
/***************************************************************************//** * @file gpio_api.c ******************************************************************************* * @section License * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> ******************************************************************************* * * SPDX-License-Identifier: Apache-2.0 * * 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 "gpio_api.h" #include "pinmap.h" #include "em_cmu.h" #include "mbed_assert.h" #include "sleepmodes.h" void gpio_write(gpio_t *obj, int value) { if (value) { GPIO_PinOutSet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); // Pin number encoded in first four bits of obj->pin } else { GPIO_PinOutClear((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); } } int gpio_read(gpio_t *obj) { if (obj->dir == PIN_INPUT) { return GPIO_PinInGet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); // Pin number encoded in first four bits of obj->pin } else { return GPIO_PinOutGet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); } } int gpio_is_connected(const gpio_t *obj) { return ((uint32_t)obj->pin | 0xFFFFFF00 ) != (uint32_t)((PinName)NC); } /* * @return the GPIO port mask for this pin * Pin and port index encoded in one uint32. * First four bits represent the pin number * The remaining bits represent the pin mode */ uint32_t gpio_set(PinName pin) { return 1 << ((uint32_t) pin & 0xF); } void gpio_init(gpio_t *obj, PinName pin) { MBED_ASSERT(pin != NC); CMU_ClockEnable(cmuClock_HFPER, true); CMU_ClockEnable(cmuClock_GPIO, true); obj->pin = pin; } void gpio_mode(gpio_t *obj, PinMode mode) { uint32_t pin = 1 << (obj->pin & 0xF); uint32_t port = (obj->pin >> 4) & 0xF; if(obj->dir == PIN_INPUT) { switch(mode) { case PullDefault: mode = Input; break; case PullUp: mode = InputPullUp; break; case PullDown: mode = InputPullDown; break; default: break; } //Handle DOUT setting if((mode & 0x10) != 0) { //Set DOUT #ifdef _GPIO_P_DOUTSET_MASK GPIO->P[port].DOUTSET = pin; #else GPIO->P[port].DOUT |= pin; #endif } else { //Clear DOUT #ifdef _GPIO_P_DOUTCLR_MASK GPIO->P[port].DOUTCLR = pin; #else GPIO->P[port].DOUT &= ~pin; #endif } } else { switch(mode) { case PullDefault: mode = PushPull; break; case PullUp: mode = WiredAndPullUp; break; case PullDown: mode = WiredOrPullDown; break; default: break; } } obj->mode = mode; // Update object pin_mode(obj->pin, mode); // Update register } // Used by DigitalInOut to set correct mode when direction is set void gpio_dir(gpio_t *obj, PinDirection direction) { obj->dir = direction; switch (direction) { case PIN_INPUT: gpio_mode(obj, PullDefault); break; case PIN_OUTPUT: gpio_mode(obj, PullNone); break; } }