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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 "mbed_assert.h"
#include "pinmap.h"
#include "mbed_error.h"
/**
* Set the pin into input, output, alternate function or analog mode
*/
void pin_function(PinName pin, int data) {
MBED_ASSERT(pin != (PinName)NC);
int mode = STM_PIN_MODE(data);
int func = STM_PIN_FUNC(data);
uint32_t pin_number = (uint32_t)pin;
int port_index = pin_number >> 4;
int pin_index = (pin_number & 0xF);
GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
// MODE
int offset = pin_index << 1;
gpio->MODER &= ~(0x3 << offset);
gpio->MODER |= mode << offset;
// Set high-speed mode
gpio->OSPEEDR &= ~(0x3 << offset);
gpio->OSPEEDR |= (0x2 << offset);
// FUNCTION
// Bottom seven pins are in AFR[0], top seven in AFR[1]
offset = (pin_index & 0x7) << 2;
if (pin_index <= 0x7) {
gpio->AFR[0] &= ~(0xF << offset);
gpio->AFR[0] |= func << offset;
}
else {
gpio->AFR[1] &= ~(0xF << offset);
gpio->AFR[1] |= func << offset;
}
}
void pin_mode(PinName pin, PinMode mode) {
MBED_ASSERT(pin != (PinName)NC);
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 << 10)));
if (mode == OpenDrain) {
gpio->OTYPER |= 1 << pin_index;
}
else {
gpio->OTYPER &= ~(1 << pin_index);
gpio->PUPDR &= ~(0x3 << offset);
gpio->PUPDR |= mode << offset;
}
}
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