tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4XX/pinmap.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "mbed_assert.h"
  17 #include "pinmap.h"
  18 #include "mbed_error.h"
  19
  20 /**
  21  * Set the pin into input, output, alternate function or analog mode
  22  */
  23 void pin_function(PinName pin, int data) {
  24     MBED_ASSERT(pin != (PinName)NC);
  25
  26     int mode = STM_PIN_MODE(data);
  27     int func = STM_PIN_FUNC(data);
  28
  29     uint32_t pin_number = (uint32_t)pin;
  30     int port_index = pin_number >> 4;
  31     int pin_index = (pin_number & 0xF);
  32     GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
  33
  34     // MODE
  35     int offset = pin_index << 1;
  36     gpio->MODER &= ~(0x3 << offset);
  37     gpio->MODER |= mode << offset;
  38
  39     // Set high-speed mode
  40     gpio->OSPEEDR &= ~(0x3 << offset);
  41     gpio->OSPEEDR |= (0x2 << offset);
  42
  43     // FUNCTION
  44     // Bottom seven pins are in AFR[0], top seven in AFR[1]
  45     offset = (pin_index & 0x7) << 2;
  46     if (pin_index <= 0x7) {
  47         gpio->AFR[0] &= ~(0xF << offset);
  48         gpio->AFR[0] |= func << offset;
  49     }
  50     else {
  51         gpio->AFR[1] &= ~(0xF << offset);
  52         gpio->AFR[1] |= func << offset;
  53     }
  54 }
  55
  56 void pin_mode(PinName pin, PinMode mode) {
  57     MBED_ASSERT(pin != (PinName)NC);
  58
  59     uint32_t pin_number = (uint32_t)pin;
  60     int port_index = pin_number >> 4;
  61     int pin_index = (pin_number & 0xF);
  62     int offset = pin_index << 1;
  63
  64     GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
  65     if (mode == OpenDrain) {
  66         gpio->OTYPER |= 1 << pin_index;
  67     }
  68     else {
  69         gpio->OTYPER &= ~(1 << pin_index);
  70         gpio->PUPDR &= ~(0x3 << offset);
  71         gpio->PUPDR |= mode << offset;
  72     }
  73 }
  74