Julien Cassette / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32F4XX/pinmap.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 17 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 18 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 /**
bogdanm 0:9b334a45a8ff 21 * Set the pin into input, output, alternate function or analog mode
bogdanm 0:9b334a45a8ff 22 */
bogdanm 0:9b334a45a8ff 23 void pin_function(PinName pin, int data) {
bogdanm 0:9b334a45a8ff 24 MBED_ASSERT(pin != (PinName)NC);
bogdanm 0:9b334a45a8ff 25
bogdanm 0:9b334a45a8ff 26 int mode = STM_PIN_MODE(data);
bogdanm 0:9b334a45a8ff 27 int func = STM_PIN_FUNC(data);
bogdanm 0:9b334a45a8ff 28
bogdanm 0:9b334a45a8ff 29 uint32_t pin_number = (uint32_t)pin;
bogdanm 0:9b334a45a8ff 30 int port_index = pin_number >> 4;
bogdanm 0:9b334a45a8ff 31 int pin_index = (pin_number & 0xF);
bogdanm 0:9b334a45a8ff 32 GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 // MODE
bogdanm 0:9b334a45a8ff 35 int offset = pin_index << 1;
bogdanm 0:9b334a45a8ff 36 gpio->MODER &= ~(0x3 << offset);
bogdanm 0:9b334a45a8ff 37 gpio->MODER |= mode << offset;
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 // Set high-speed mode
bogdanm 0:9b334a45a8ff 40 gpio->OSPEEDR &= ~(0x3 << offset);
bogdanm 0:9b334a45a8ff 41 gpio->OSPEEDR |= (0x2 << offset);
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 // FUNCTION
bogdanm 0:9b334a45a8ff 44 // Bottom seven pins are in AFR[0], top seven in AFR[1]
bogdanm 0:9b334a45a8ff 45 offset = (pin_index & 0x7) << 2;
bogdanm 0:9b334a45a8ff 46 if (pin_index <= 0x7) {
bogdanm 0:9b334a45a8ff 47 gpio->AFR[0] &= ~(0xF << offset);
bogdanm 0:9b334a45a8ff 48 gpio->AFR[0] |= func << offset;
bogdanm 0:9b334a45a8ff 49 }
bogdanm 0:9b334a45a8ff 50 else {
bogdanm 0:9b334a45a8ff 51 gpio->AFR[1] &= ~(0xF << offset);
bogdanm 0:9b334a45a8ff 52 gpio->AFR[1] |= func << offset;
bogdanm 0:9b334a45a8ff 53 }
bogdanm 0:9b334a45a8ff 54 }
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 void pin_mode(PinName pin, PinMode mode) {
bogdanm 0:9b334a45a8ff 57 MBED_ASSERT(pin != (PinName)NC);
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 uint32_t pin_number = (uint32_t)pin;
bogdanm 0:9b334a45a8ff 60 int port_index = pin_number >> 4;
bogdanm 0:9b334a45a8ff 61 int pin_index = (pin_number & 0xF);
bogdanm 0:9b334a45a8ff 62 int offset = pin_index << 1;
bogdanm 0:9b334a45a8ff 63
bogdanm 0:9b334a45a8ff 64 GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
bogdanm 0:9b334a45a8ff 65 if (mode == OpenDrain) {
bogdanm 0:9b334a45a8ff 66 gpio->OTYPER |= 1 << pin_index;
bogdanm 0:9b334a45a8ff 67 }
bogdanm 0:9b334a45a8ff 68 else {
bogdanm 0:9b334a45a8ff 69 gpio->OTYPER &= ~(1 << pin_index);
bogdanm 0:9b334a45a8ff 70 gpio->PUPDR &= ~(0x3 << offset);
bogdanm 0:9b334a45a8ff 71 gpio->PUPDR |= mode << offset;
bogdanm 0:9b334a45a8ff 72 }
bogdanm 0:9b334a45a8ff 73 }
bogdanm 0:9b334a45a8ff 74