Ermanno Brusadin / mbed-src

mbed library sources

targets/hal/TARGET_STM/TARGET_STM32F4XX/pinmap.c@0:0a673c671a56, 2016-07-27 (annotated)

Committer:
ebrus
Date:
Wed Jul 27 18:35:32 2016 +0000
Revision:
0:0a673c671a56
4

Who changed what in which revision?

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ebrus 0:0a673c671a56 1 /* mbed Microcontroller Library
ebrus 0:0a673c671a56 2 * Copyright (c) 2006-2013 ARM Limited
ebrus 0:0a673c671a56 3 *
ebrus 0:0a673c671a56 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:0a673c671a56 5 * you may not use this file except in compliance with the License.
ebrus 0:0a673c671a56 6 * You may obtain a copy of the License at
ebrus 0:0a673c671a56 7 *
ebrus 0:0a673c671a56 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:0a673c671a56 9 *
ebrus 0:0a673c671a56 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:0a673c671a56 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:0a673c671a56 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:0a673c671a56 13 * See the License for the specific language governing permissions and
ebrus 0:0a673c671a56 14 * limitations under the License.
ebrus 0:0a673c671a56 15 */
ebrus 0:0a673c671a56 16 #include "mbed_assert.h"
ebrus 0:0a673c671a56 17 #include "pinmap.h"
ebrus 0:0a673c671a56 18 #include "mbed_error.h"
ebrus 0:0a673c671a56 19
ebrus 0:0a673c671a56 20 /**
ebrus 0:0a673c671a56 21 * Set the pin into input, output, alternate function or analog mode
ebrus 0:0a673c671a56 22 */
ebrus 0:0a673c671a56 23 void pin_function(PinName pin, int data) {
ebrus 0:0a673c671a56 24 MBED_ASSERT(pin != (PinName)NC);
ebrus 0:0a673c671a56 25
ebrus 0:0a673c671a56 26 int mode = STM_PIN_MODE(data);
ebrus 0:0a673c671a56 27 int func = STM_PIN_FUNC(data);
ebrus 0:0a673c671a56 28
ebrus 0:0a673c671a56 29 uint32_t pin_number = (uint32_t)pin;
ebrus 0:0a673c671a56 30 int port_index = pin_number >> 4;
ebrus 0:0a673c671a56 31 int pin_index = (pin_number & 0xF);
ebrus 0:0a673c671a56 32 GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
ebrus 0:0a673c671a56 33
ebrus 0:0a673c671a56 34 // MODE
ebrus 0:0a673c671a56 35 int offset = pin_index << 1;
ebrus 0:0a673c671a56 36 gpio->MODER &= ~(0x3 << offset);
ebrus 0:0a673c671a56 37 gpio->MODER |= mode << offset;
ebrus 0:0a673c671a56 38
ebrus 0:0a673c671a56 39 // Set high-speed mode
ebrus 0:0a673c671a56 40 gpio->OSPEEDR &= ~(0x3 << offset);
ebrus 0:0a673c671a56 41 gpio->OSPEEDR |= (0x2 << offset);
ebrus 0:0a673c671a56 42
ebrus 0:0a673c671a56 43 // FUNCTION
ebrus 0:0a673c671a56 44 // Bottom seven pins are in AFR[0], top seven in AFR[1]
ebrus 0:0a673c671a56 45 offset = (pin_index & 0x7) << 2;
ebrus 0:0a673c671a56 46 if (pin_index <= 0x7) {
ebrus 0:0a673c671a56 47 gpio->AFR[0] &= ~(0xF << offset);
ebrus 0:0a673c671a56 48 gpio->AFR[0] |= func << offset;
ebrus 0:0a673c671a56 49 }
ebrus 0:0a673c671a56 50 else {
ebrus 0:0a673c671a56 51 gpio->AFR[1] &= ~(0xF << offset);
ebrus 0:0a673c671a56 52 gpio->AFR[1] |= func << offset;
ebrus 0:0a673c671a56 53 }
ebrus 0:0a673c671a56 54 }
ebrus 0:0a673c671a56 55
ebrus 0:0a673c671a56 56 void pin_mode(PinName pin, PinMode mode) {
ebrus 0:0a673c671a56 57 MBED_ASSERT(pin != (PinName)NC);
ebrus 0:0a673c671a56 58
ebrus 0:0a673c671a56 59 uint32_t pin_number = (uint32_t)pin;
ebrus 0:0a673c671a56 60 int port_index = pin_number >> 4;
ebrus 0:0a673c671a56 61 int pin_index = (pin_number & 0xF);
ebrus 0:0a673c671a56 62 int offset = pin_index << 1;
ebrus 0:0a673c671a56 63
ebrus 0:0a673c671a56 64 GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
ebrus 0:0a673c671a56 65 if (mode == OpenDrain) {
ebrus 0:0a673c671a56 66 gpio->OTYPER |= 1 << pin_index;
ebrus 0:0a673c671a56 67 }
ebrus 0:0a673c671a56 68 else {
ebrus 0:0a673c671a56 69 gpio->OTYPER &= ~(1 << pin_index);
ebrus 0:0a673c671a56 70 gpio->PUPDR &= ~(0x3 << offset);
ebrus 0:0a673c671a56 71 gpio->PUPDR |= mode << offset;
ebrus 0:0a673c671a56 72 }
ebrus 0:0a673c671a56 73 }
ebrus 0:0a673c671a56 74