mirror of https://github.com/ARMmbed/mbed-os.git
110 lines
3.5 KiB
C
110 lines
3.5 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 "pinmap.h"
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#include "error.h"
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// Alternate-function mapping
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// TODO: add lines if needed...
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static const uint32_t AF_mapping[] = {
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0, // 0 = No AF
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GPIO_Remap_SPI1, // 1
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GPIO_Remap_I2C1, // 2
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GPIO_Remap_USART1, // 3
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GPIO_Remap_USART2 // 4
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};
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/**
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* Set the pin function (input, output, alternate function or analog) + output speed + AF
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*/
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void pin_function(PinName pin, int data) {
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if (pin == NC) return;
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// Get the pin mode and alternate-function number
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uint32_t mode = STM_PIN_MODE(data);
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uint32_t afnum = STM_PIN_AFNUM(data);
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// Get GPIO structure base address
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uint32_t pin_number = (uint32_t)pin;
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uint32_t pin_index = (pin_number & 0xF);
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uint32_t port_index = (pin_number >> 4);
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GPIO_TypeDef *gpio = ((GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10)));
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// Enable GPIO clock
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RCC_APB2PeriphClockCmd((uint32_t)(RCC_APB2Periph_GPIOA << port_index), ENABLE);
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// Configure GPIO
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = (uint16_t)(1 << pin_index);
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GPIO_InitStructure.GPIO_Mode = (GPIOMode_TypeDef)mode;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(gpio, &GPIO_InitStructure);
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// Configure Alternate Function
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if ((afnum > 0) && (afnum < 5)) {
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
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GPIO_PinRemapConfig(AF_mapping[afnum], ENABLE);
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}
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}
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/**
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* Set the pin mode (open-drain/push-pull + pull-up/pull-down)
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*/
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void pin_mode(PinName pin, PinMode mode) {
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if (pin == NC) return;
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GPIO_InitTypeDef GPIO_InitStructure;
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// Get GPIO structure base address
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uint32_t pin_number = (uint32_t)pin;
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uint32_t pin_index = (pin_number & 0xF);
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uint32_t port_index = (pin_number >> 4);
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GPIO_TypeDef *gpio = ((GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10)));
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// Enable GPIO clock
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RCC_APB2PeriphClockCmd((uint32_t)(RCC_APB2Periph_GPIOA << port_index), ENABLE);
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// Configure open-drain and pull-up/down
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switch (mode) {
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case PullNone:
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return;
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case PullUp:
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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break;
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case PullDown:
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
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break;
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case OpenDrain:
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if (pin_index < 8) {
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if ((gpio->CRL & (0x03 << (pin_index * 4))) > 0) { // MODE bits = Output mode
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gpio->CRL |= (0x04 << (pin_index * 4)); // Set open-drain
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}
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}
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else {
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if ((gpio->CRH & (0x03 << ((pin_index % 8) * 4))) > 0) { // MODE bits = Output mode
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gpio->CRH |= (0x04 << ((pin_index % 8) * 4)); // Set open-drain
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}
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}
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return;
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default:
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break;
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}
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// Configure GPIO
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GPIO_InitStructure.GPIO_Pin = (uint16_t)(1 << pin_index);
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(gpio, &GPIO_InitStructure);
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}
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