mbed library sources
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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c
- Committer:
- mbed_official
- Date:
- 2015-07-20
- Revision:
- 593:78ee8643776a
- Parent:
- 556:a217bc785985
- Child:
- 627:4fa1328d9c60
File content as of revision 593:78ee8643776a:
/* 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 "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 (obj->pin | 0xFFFFFF00 )!= (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) { 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 GPIO->P[(obj->pin >> 4) & 0xF].DOUTSET = 1 << (obj->pin & 0xF); } else { //Clear DOUT GPIO->P[(obj->pin >> 4) & 0xF].DOUTCLR = 1 << (obj->pin & 0xF); } } 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; } }