Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32L4/gpio_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "mbed_assert.h"
elessair 0:f269e3021894 31 #include "gpio_api.h"
elessair 0:f269e3021894 32 #include "pinmap.h"
elessair 0:f269e3021894 33 #include "mbed_error.h"
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 uint32_t gpio_set(PinName pin)
elessair 0:f269e3021894 38 {
elessair 0:f269e3021894 39 MBED_ASSERT(pin != (PinName)NC);
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 pin_function(pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
elessair 0:f269e3021894 42 return (uint32_t)(1 << ((uint32_t)pin & 0xF)); // Return the pin mask
elessair 0:f269e3021894 43 }
elessair 0:f269e3021894 44
elessair 0:f269e3021894 45 void gpio_init(gpio_t *obj, PinName pin)
elessair 0:f269e3021894 46 {
elessair 0:f269e3021894 47 obj->pin = pin;
elessair 0:f269e3021894 48 if (pin == (PinName)NC)
elessair 0:f269e3021894 49 return;
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 uint32_t port_index = STM_PORT(pin);
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 // Enable GPIO clock
elessair 0:f269e3021894 54 uint32_t gpio_add = Set_GPIO_Clock(port_index);
elessair 0:f269e3021894 55 GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 // Fill GPIO object structure for future use
elessair 0:f269e3021894 58 obj->mask = gpio_set(pin);
elessair 0:f269e3021894 59 obj->reg_in = &gpio->IDR;
elessair 0:f269e3021894 60 obj->reg_set = &gpio->BSRR;
elessair 0:f269e3021894 61 obj->reg_clr = &gpio->BRR;
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 void gpio_mode(gpio_t *obj, PinMode mode)
elessair 0:f269e3021894 65 {
elessair 0:f269e3021894 66 pin_mode(obj->pin, mode);
elessair 0:f269e3021894 67 }
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 void gpio_dir(gpio_t *obj, PinDirection direction)
elessair 0:f269e3021894 70 {
elessair 0:f269e3021894 71 MBED_ASSERT(obj->pin != (PinName)NC);
elessair 0:f269e3021894 72 if (direction == PIN_OUTPUT) {
elessair 0:f269e3021894 73 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
elessair 0:f269e3021894 74 } else { // PIN_INPUT
elessair 0:f269e3021894 75 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
elessair 0:f269e3021894 76 }
elessair 0:f269e3021894 77 }