1 /* mbed Microcontroller Library
2 *******************************************************************************
3 * Copyright (c) 2014, STMicroelectronics
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *******************************************************************************
30 #include "mbed_assert.h"
33 #include "mbed_error.h"
35 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
37 uint32_t gpio_set(PinName pin)
39 MBED_ASSERT(pin != (PinName)NC);
41 pin_function(pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
42 return (uint32_t)(1 << ((uint32_t)pin & 0xF)); // Return the pin mask
45 void gpio_init(gpio_t *obj, PinName pin)
48 if (pin == (PinName)NC)
51 uint32_t port_index = STM_PORT(pin);
54 uint32_t gpio_add = Set_GPIO_Clock(port_index);
55 GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
57 // Fill GPIO object structure for future use
58 obj->mask = gpio_set(pin);
59 obj->reg_in = &gpio->IDR;
60 obj->reg_set = &gpio->BSRR;
61 obj->reg_clr = &gpio->BRR;
64 void gpio_mode(gpio_t *obj, PinMode mode)
66 pin_mode(obj->pin, mode);
69 void gpio_dir(gpio_t *obj, PinDirection direction)
71 MBED_ASSERT(obj->pin != (PinName)NC);
72 if (direction == PIN_OUTPUT) {
73 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
75 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));