111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief STM32 GPIO control interface.
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*
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* \author Andrea Righi <arighi@develer.com>
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*/
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#include "gpio_stm32.h"
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#include <cfg/compiler.h>
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#include <cfg/debug.h>
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#include <io/stm32.h>
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/**
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* Configure a GPIO pin
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*
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* \param base Base address of the GPIO port
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* \param pins Bit-packed representation of the pin(s)
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* \param mode Pin(s) configuration mode
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* \param speed Output drive speed
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*
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* Return 0 on success, otherwise a negative value.
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*/
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int stm32_gpioPinConfig(struct stm32_gpio *base,
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uint16_t pins, uint8_t mode, uint8_t speed)
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{
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uint32_t reg_mode = mode & 0x0f;
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int i;
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if (mode & 0x10)
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reg_mode |= speed;
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if (pins & 0xff)
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{
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uint32_t reg = base->CRL;
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for (i = 0; i < 8; i++)
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{
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uint32_t pos = 1 << i;
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if (pins & pos)
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{
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pos = i << 2;
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reg &= ~(0x0f << pos);
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reg |= reg_mode << pos;
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if (mode == GPIO_MODE_IPD)
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base->BRR = 0x01 << i;
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if (mode == GPIO_MODE_IPU)
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base->BSRR = 0x01 << i;
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}
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}
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base->CRL = reg;
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}
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if (pins > 0xff)
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{
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uint32_t reg = base->CRH;
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for (i = 0; i < 8; i++)
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{
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uint32_t pos = 1 << (i + 8);
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if (pins & pos)
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{
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pos = i << 2;
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reg &= ~(0x0f << pos);
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reg |= reg_mode << pos;
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if (mode == GPIO_MODE_IPD)
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base->BRR = 0x01 << (i + 8);
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if (mode == GPIO_MODE_IPU)
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base->BSRR = 0x01 << (i + 8);
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}
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}
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base->CRH = reg;
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}
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return 0;
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}
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