mirror of https://github.com/ARMmbed/mbed-os.git
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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/**
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* Set the pin into input, output, alternate function or analog mode
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*/
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void pin_function(PinName pin, int data) {
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MBED_ASSERT(pin != (PinName)NC);
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int mode = STM_PIN_MODE(data);
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int func = STM_PIN_FUNC(data);
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uint32_t pin_number = (uint32_t)pin;
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int port_index = pin_number >> 4;
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int pin_index = (pin_number & 0xF);
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GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
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// MODE
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int offset = pin_index << 1;
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gpio->MODER &= ~(0x3 << offset);
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gpio->MODER |= mode << offset;
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// Set high-speed mode
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gpio->OSPEEDR &= ~(0x3 << offset);
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gpio->OSPEEDR |= (0x2 << offset);
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// FUNCTION
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// Bottom seven pins are in AFR[0], top seven in AFR[1]
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offset = (pin_index & 0x7) << 2;
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if (pin_index <= 0x7) {
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gpio->AFR[0] &= ~(0xF << offset);
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gpio->AFR[0] |= func << offset;
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}
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else {
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gpio->AFR[1] &= ~(0xF << offset);
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gpio->AFR[1] |= func << offset;
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}
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}
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void pin_mode(PinName pin, PinMode mode) {
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MBED_ASSERT(pin != (PinName)NC);
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uint32_t pin_number = (uint32_t)pin;
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int port_index = pin_number >> 4;
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int pin_index = (pin_number & 0xF);
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int offset = pin_index << 1;
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GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
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if (mode == OpenDrain) {
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gpio->OTYPER |= 1 << pin_index;
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}
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else {
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gpio->OTYPER &= ~(1 << pin_index);
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gpio->PUPDR &= ~(0x3 << offset);
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gpio->PUPDR |= mode << offset;
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}
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}
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