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Add pinmap.

pull/8/head
Joe Turner 2013-04-24 09:45:09 +01:00
parent 7acc783058
commit f51b151a9c
1 changed files with 74 additions and 0 deletions
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74
libraries/mbed/vendor/STM/capi/pinmap.c vendored
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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pinmap.h"
#include "error.h"
/**
* Set the pin into input, output, alternate function or analog mode
*/
void pin_function(PinName pin, int function) {
if (pin == (uint32_t)NC) return;
uint32_t pin_number = (uint32_t)pin;
int port_index = pin_number >> 4;
int pin_index = (pin_number & 0xF);
int offset = pin_index << 1;
GPIO_TypeDef * gpio = ((GPIO_TypeDef *) GPIOA_BASE + port_index << 6);
gpio->MODER &= ~(0x3 << offset);
gpio->MODER |= function << offset;
}
void pin_alternate_function(PinName pin, int function) {
if (pin == (uint32_t)NC) return;
uint32_t pin_number = (uint32_t)pin;
int port_index = pin_number >> 4;
int pin_index = (pin_number & 0xF);
int offset = (pin_index & 0x7) << 2;
GPIO_TypeDef * gpio = ((GPIO_TypeDef *) GPIOA_BASE + port_index << 6);
// Bottom seven pins are in AFR[0], top seven in AFR[1]
if (pin_index <= 0x7) {
gpio->AFR[0] &= ~(0xF << offset);
gpio->AFR[0] |= function << offset;
}
else {
gpio->AFR[1] &= ~(0xF << offset);
gpio->AFR[1] |= function << offset;
}
}
void pin_mode(PinName pin, PinMode mode) {
if (pin == (uint32_t)NC) { return; }
uint32_t pin_number = (uint32_t)pin;
int port_index = pin_number >> 4;
int pin_index = (pin_number & 0xF);
int offset = pin_index << 1;
GPIO_TypeDef * gpio = ((GPIO_TypeDef *) GPIOA_BASE + port_index << 6);
if (mode == OpenDrain) {
gpio->OTYPER |= 1 << pin_index;
}
else {
gpio->OTYPER &= ~(1 << pin_index);
gpio->PUPDR &= ~(0x3 << offset);
gpio->PUPDR |= mode << offset;
}
}