tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F3/port_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   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.
  17  *
  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  *******************************************************************************
  29  */
  30 #include "port_api.h"
  31 #include "pinmap.h"
  32 #include "gpio_api.h"
  33 #include "mbed_error.h"
  34
  35 #if DEVICE_PORTIN || DEVICE_PORTOUT
  36
  37 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
  38
  39 // high nibble = port number (0=A, 1=B, 2=C, 3=D, 4=E, 5=F, ...)
  40 // low nibble  = pin number
  41 PinName port_pin(PortName port, int pin_n)
  42 {
  43     return (PinName)(pin_n + (port << 4));
  44 }
  45
  46 void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
  47 {
  48     uint32_t port_index = (uint32_t)port;
  49
  50     // Enable GPIO clock
  51     uint32_t gpio_add = Set_GPIO_Clock(port_index);
  52     GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
  53
  54     // Fill PORT object structure for future use
  55     obj->port      = port;
  56     obj->mask      = mask;
  57     obj->direction = dir;
  58     obj->reg_in    = &gpio->IDR;
  59     obj->reg_out   = &gpio->ODR;
  60
  61     port_dir(obj, dir);
  62 }
  63
  64 void port_dir(port_t *obj, PinDirection dir)
  65 {
  66     uint32_t i;
  67     obj->direction = dir;
  68     for (i = 0; i < 16; i++) { // Process all pins
  69         if (obj->mask & (1 << i)) { // If the pin is used
  70             if (dir == PIN_OUTPUT) {
  71                 pin_function(port_pin(obj->port, i), STM_PIN_DATA(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
  72             } else { // PIN_INPUT
  73                 pin_function(port_pin(obj->port, i), STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
  74             }
  75         }
  76     }
  77 }
  78
  79 void port_mode(port_t *obj, PinMode mode)
  80 {
  81     uint32_t i;
  82     for (i = 0; i < 16; i++) { // Process all pins
  83         if (obj->mask & (1 << i)) { // If the pin is used
  84             pin_mode(port_pin(obj->port, i), mode);
  85         }
  86     }
  87 }
  88
  89 void port_write(port_t *obj, int value)
  90 {
  91     *obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
  92 }
  93
  94 int port_read(port_t *obj)
  95 {
  96     if (obj->direction == PIN_OUTPUT) {
  97         return (*obj->reg_out & obj->mask);
  98     } else { // PIN_INPUT
  99         return (*obj->reg_in & obj->mask);
 100     }
 101 }
 102
 103 #endif